# FragmentTransaction
Artifact: [androidx.fragment:fragment](https://developer.android.com/jetpack/androidx/releases/fragment) [View Source](https://cs.android.com/search?q=file:androidx/fragment/app/FragmentTransaction.java+class:androidx.fragment.app.FragmentTransaction) Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
*** ** * ** ***
```
abstract class FragmentTransaction
```
*** ** * ** ***
Static library support version of the framework's `https://developer.android.com/reference/android/app/FragmentTransaction.html`. Used to write apps that run on platforms prior to Android 3.0. When running on Android 3.0 or above, this implementation is still used; it does not try to switch to the framework's implementation. See the framework SDK documentation for a class overview.
## Summary
| ### Constants |
|---|---|
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_ENTER_MASK() = 4096` Bit mask that is set for all enter transitions. |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_EXIT_MASK() = 8192` Bit mask that is set for all exit transitions. |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_CLOSE() = 8194` Fragment is being removed from the stack |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_FADE() = 4099` Fragment should simply fade in or out; that is, no strong navigation associated with it except that it is appearing or disappearing for some reason. |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_MATCH_ACTIVITY_CLOSE() = 8197` Fragment is being removed from the stack with Activity close transition. |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_MATCH_ACTIVITY_OPEN() = 4100` Fragment is being added onto the stack with Activity open transition. |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_OPEN() = 4097` Fragment is being added onto the stack |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_NONE() = 0` No animation for transition. |
| `const https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_UNSET() = -1` Not set up for a transition. |
| ### Public constructors |
|---|
| `[FragmentTransaction](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#FragmentTransaction())()` **This function is deprecated.** You should not instantiate a FragmentTransaction except via `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#beginTransaction()`.
|
| ### Public functions |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment)(containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)` with a null tag. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(androidx.fragment.app.Fragment,java.lang.String)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?)` Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)` with a 0 containerViewId. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(android.view.ViewGroup,androidx.fragment.app.Fragment,java.lang.String)(container: https://developer.android.com/reference/android/view/ViewGroup.html, fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?)` Add a fragment to the activity state. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,java.lang.Class,android.os.Bundle)( containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragmentClass: https://developer.android.com/reference/java/lang/Class.html, args: https://developer.android.com/reference/android/os/Bundle.html? )` Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,java.lang.Class,android.os.Bundle,java.lang.String)` with a null tag. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)(containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?)` Add a fragment to the activity state. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(java.lang.Class,android.os.Bundle,java.lang.String)(fragmentClass: https://developer.android.com/reference/java/lang/Class.html, args: https://developer.android.com/reference/android/os/Bundle.html?, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?)` Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,java.lang.Class,android.os.Bundle,java.lang.String)` with a 0 containerViewId. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,java.lang.Class,android.os.Bundle,java.lang.String)( containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragmentClass: https://developer.android.com/reference/java/lang/Class.html, args: https://developer.android.com/reference/android/os/Bundle.html?, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html? )` Add a fragment to the activity state. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addSharedElement(android.view.View,java.lang.String)(sharedElement: https://developer.android.com/reference/android/view/View.html, name: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html)` Used with custom Transitions to map a View from a removed or hidden Fragment to a View from a shown or added Fragment. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)(name: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?)` Add this transaction to the back stack. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#attach(androidx.fragment.app.Fragment)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Re-attach a fragment after it had previously been detached from the UI with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#detach(androidx.fragment.app.Fragment)`. |
| `abstract https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commit()()` Schedules a commit of this transaction. |
| `abstract https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitAllowingStateLoss()()` Like `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commit()` but allows the commit to be executed after an activity's state is saved. |
| `abstract https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `@https://developer.android.com/reference/kotlin/androidx/annotation/MainThread https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitNow()()` Commits this transaction synchronously. |
| `abstract https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `@https://developer.android.com/reference/kotlin/androidx/annotation/MainThread https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitNowAllowingStateLoss()()` Like `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitNow()` but allows the commit to be executed after an activity's state is saved. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#detach(androidx.fragment.app.Fragment)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Detach the given fragment from the UI. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#disallowAddToBackStack()()` Disallow calls to `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)`. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#hide(androidx.fragment.app.Fragment)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Hides an existing fragment. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#isAddToBackStackAllowed()()` Returns true if this FragmentTransaction is allowed to be added to the back stack. |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#isEmpty()()` |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#remove(androidx.fragment.app.Fragment)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Remove an existing fragment. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,androidx.fragment.app.Fragment)(containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,androidx.fragment.app.Fragment,java.lang.String)` with a null tag. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,java.lang.Class,android.os.Bundle)( containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragmentClass: https://developer.android.com/reference/java/lang/Class.html, args: https://developer.android.com/reference/android/os/Bundle.html? )` Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,java.lang.Class,android.os.Bundle,java.lang.String)` with a null tag. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,androidx.fragment.app.Fragment,java.lang.String)(containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?)` Replace an existing fragment that was added to a container. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,java.lang.Class,android.os.Bundle,java.lang.String)( containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, fragmentClass: https://developer.android.com/reference/java/lang/Class.html, args: https://developer.android.com/reference/android/os/Bundle.html?, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html? )` Replace an existing fragment that was added to a container. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#runOnCommit(java.lang.Runnable)(runnable: https://developer.android.com/reference/java/lang/Runnable.html)` Add a Runnable to this transaction that will be run after this transaction has been committed. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `[setAllowOptimization](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setAllowOptimization(boolean))(allowOptimization: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)` **This function is deprecated.** This has been renamed `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setReorderingAllowed(boolean)`.
|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `[setBreadCrumbShortTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbShortTitle(int))(res: @https://developer.android.com/reference/kotlin/androidx/annotation/StringRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` **This function is deprecated.** Store breadcrumb short titles separately from fragment transactions.
|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `[setBreadCrumbShortTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbShortTitle(java.lang.CharSequence))(text: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html?)` **This function is deprecated.** Store breadcrumb short titles separately from fragment transactions.
|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `[setBreadCrumbTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbTitle(int))(res: @https://developer.android.com/reference/kotlin/androidx/annotation/StringRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` **This function is deprecated.** Store breadcrumb titles separately from fragment transactions.
|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `[setBreadCrumbTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbTitle(java.lang.CharSequence))(text: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-char-sequence/index.html?)` **This function is deprecated.** Store breadcrumb titles separately from fragment transactions.
|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setCustomAnimations(int,int)( enter: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, exit: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html )` Set specific animation resources to run for the fragments that are entering and exiting in this transaction. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setCustomAnimations(int,int,int,int)( enter: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, exit: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, popEnter: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, popExit: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html )` Set specific animation resources to run for the fragments that are entering and exiting in this transaction. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setMaxLifecycle(androidx.fragment.app.Fragment,androidx.lifecycle.Lifecycle.State)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment, state: https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State)` Set a ceiling for the state of an active fragment in this FragmentManager. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setPrimaryNavigationFragment(androidx.fragment.app.Fragment)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment?)` Set a currently active fragment in this FragmentManager as the primary navigation fragment. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setReorderingAllowed(boolean)(reorderingAllowed: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html)` Sets whether or not to allow optimizing operations within and across transactions. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setTransition(int)(transition: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` Select a standard transition animation for this transaction. |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `[setTransitionStyle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setTransitionStyle(int))(styleRes: @https://developer.android.com/reference/kotlin/androidx/annotation/StyleRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` **This function is deprecated.** The desired functionality never worked correctly.
|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#show(androidx.fragment.app.Fragment)(fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment)` Shows a previously hidden fragment. |
| ### Extension functions |
|---|---|
| `inline https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | ` https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction.https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#(androidx.fragment.app.FragmentTransaction).add(kotlin.String,android.os.Bundle)(tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html, args: https://developer.android.com/reference/android/os/Bundle.html?)` Add a fragment to the associated `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager` without adding the Fragment to any container view. |
| `inline https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | ` https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction.https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#(androidx.fragment.app.FragmentTransaction).add(kotlin.Int,kotlin.String,android.os.Bundle)( containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?, args: https://developer.android.com/reference/android/os/Bundle.html? )` Add a fragment to the associated `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager`, inflating the Fragment's view into the container view specified by `https://developer.android.com/reference/kotlin/androidx/fragment/app/package-summary#(androidx.fragment.app.FragmentTransaction).add(kotlin.Int,kotlin.String,android.os.Bundle)`, to later retrieve via `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentById(int)`. |
| `inline https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | ` https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction.https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#(androidx.fragment.app.FragmentTransaction).replace(kotlin.Int,kotlin.String,android.os.Bundle)( containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html, tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?, args: https://developer.android.com/reference/android/os/Bundle.html? )` Replace an existing fragment that was added to a container. |
## Constants
### TRANSIT_ENTER_MASK
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_ENTER_MASK = 4096: Int
```
Bit mask that is set for all enter transitions.
### TRANSIT_EXIT_MASK
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_EXIT_MASK = 8192: Int
```
Bit mask that is set for all exit transitions.
### TRANSIT_FRAGMENT_CLOSE
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_FRAGMENT_CLOSE = 8194: Int
```
Fragment is being removed from the stack
### TRANSIT_FRAGMENT_FADE
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_FRAGMENT_FADE = 4099: Int
```
Fragment should simply fade in or out; that is, no strong navigation associated with it except that it is appearing or disappearing for some reason.
### TRANSIT_FRAGMENT_MATCH_ACTIVITY_CLOSE
Added in [1.4.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.4.0)
```
const val TRANSIT_FRAGMENT_MATCH_ACTIVITY_CLOSE = 8197: Int
```
Fragment is being removed from the stack with Activity close transition.
| See also |
|---|---|
| `https://developer.android.com/reference/android/R.attr.html#activityCloseEnterAnimation` | |
| `https://developer.android.com/reference/android/R.attr.html#activityCloseExitAnimation` | |
### TRANSIT_FRAGMENT_MATCH_ACTIVITY_OPEN
Added in [1.4.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.4.0)
```
const val TRANSIT_FRAGMENT_MATCH_ACTIVITY_OPEN = 4100: Int
```
Fragment is being added onto the stack with Activity open transition.
| See also |
|---|---|
| `https://developer.android.com/reference/android/R.attr.html#activityOpenEnterAnimation` | |
| `https://developer.android.com/reference/android/R.attr.html#activityOpenExitAnimation` | |
### TRANSIT_FRAGMENT_OPEN
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_FRAGMENT_OPEN = 4097: Int
```
Fragment is being added onto the stack
### TRANSIT_NONE
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_NONE = 0: Int
```
No animation for transition.
### TRANSIT_UNSET
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
const val TRANSIT_UNSET = -1: Int
```
Not set up for a transition.
## Public constructors
### FragmentTransaction
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
[FragmentTransaction](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#FragmentTransaction())()
```
> [!CAUTION]
> **This function is deprecated.**
>
> You should not instantiate a FragmentTransaction except via `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#beginTransaction()`.
## Public functions
### add
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun add(containerViewId: @IdRes Int, fragment: Fragment): FragmentTransaction
```
Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)` with a null tag.
### add
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun add(fragment: Fragment, tag: String?): FragmentTransaction
```
Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)` with a 0 containerViewId.
### add
Added in [1.8.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.8.0)
```
fun add(container: ViewGroup, fragment: Fragment, tag: String?): FragmentTransaction
```
Add a fragment to the activity state. This fragment may optionally also have its view (if `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#onCreateView(android.view.LayoutInflater,android.view.ViewGroup,android.os.Bundle)` returns non-null) into a container view of the activity.
| Parameters |
|---|---|
| `container: https://developer.android.com/reference/android/view/ViewGroup.html` | The container this fragment is to be placed in. The id of the container should be non-zero and unique. |
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be added. This fragment must not already be added to the activity. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### add
Added in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun add(
containerViewId: @IdRes Int,
fragmentClass: Class,
args: Bundle?
): FragmentTransaction
```
Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,java.lang.Class,android.os.Bundle,java.lang.String)` with a null tag.
### add
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun add(containerViewId: @IdRes Int, fragment: Fragment, tag: String?): FragmentTransaction
```
Add a fragment to the activity state. This fragment may optionally also have its view (if `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#onCreateView(android.view.LayoutInflater,android.view.ViewGroup,android.os.Bundle)` returns non-null) into a container view of the activity.
| Parameters |
|---|---|
| `containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Optional identifier of the container this fragment is to be placed in. If 0, it will not be placed in a container. |
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be added. This fragment must not already be added to the activity. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### add
Added in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun add(fragmentClass: Class, args: Bundle?, tag: String?): FragmentTransaction
```
Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,java.lang.Class,android.os.Bundle,java.lang.String)` with a 0 containerViewId.
### add
Added in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun add(
containerViewId: @IdRes Int,
fragmentClass: Class,
args: Bundle?,
tag: String?
): FragmentTransaction
```
Add a fragment to the activity state. This fragment may optionally also have its view (if `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#onCreateView(android.view.LayoutInflater,android.view.ViewGroup,android.os.Bundle)` returns non-null) into a container view of the activity.
| Parameters |
|---|---|
| `containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Optional identifier of the container this fragment is to be placed in. If 0, it will not be placed in a container. |
| `fragmentClass: https://developer.android.com/reference/java/lang/Class.html` | The fragment to be added, created via the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#getFragmentFactory()`. |
| `args: https://developer.android.com/reference/android/os/Bundle.html?` | Optional arguments to be set on the fragment. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### addSharedElement
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun addSharedElement(sharedElement: View, name: String): FragmentTransaction
```
Used with custom Transitions to map a View from a removed or hidden Fragment to a View from a shown or added Fragment. sharedElement must have a unique transitionName in the View hierarchy.
| Parameters |
|---|---|
| `sharedElement: https://developer.android.com/reference/android/view/View.html` | A View in a disappearing Fragment to match with a View in an appearing Fragment. |
| `name: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html` | The transitionName for a View in an appearing Fragment to match to the shared element. |
| See also |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#setSharedElementReturnTransition(java.lang.Object)` | |
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#setSharedElementEnterTransition(java.lang.Object)` | |
### addToBackStack
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun addToBackStack(name: String?): FragmentTransaction
```
Add this transaction to the back stack. This means that the transaction will be remembered after it is committed, and will reverse its operation when later popped off the stack.
`https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setReorderingAllowed(boolean)` must be set to `true` in the same transaction as addToBackStack() to allow the pop of that transaction to be reordered.
| Parameters |
|---|---|
| `name: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?` | An optional name for this back stack state, or null. |
### attach
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun attach(fragment: Fragment): FragmentTransaction
```
Re-attach a fragment after it had previously been detached from the UI with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#detach(androidx.fragment.app.Fragment)`. This causes its view hierarchy to be re-created, attached to the UI, and displayed.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be attached. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### commit
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
abstract fun commit(): Int
```
Schedules a commit of this transaction. The commit does not happen immediately; it will be scheduled as work on the main thread to be done the next time that thread is ready.
A transaction can only be committed with this method prior to its containing activity saving its state. If the commit is attempted after that point, an exception will be thrown. This is because the state after the commit can be lost if the activity needs to be restored from its state. See `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitAllowingStateLoss()` for situations where it may be okay to lose the commit.
| Returns |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Returns the identifier of this transaction's back stack entry, if `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)` had been called. Otherwise, returns a negative number. |
### commitAllowingStateLoss
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
abstract fun commitAllowingStateLoss(): Int
```
Like `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commit()` but allows the commit to be executed after an activity's state is saved. This is dangerous because the commit can be lost if the activity needs to later be restored from its state, so this should only be used for cases where it is okay for the UI state to change unexpectedly on the user.
### commitNow
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
@MainThread
abstract fun commitNow(): Unit
```
Commits this transaction synchronously. Any added fragments will be initialized and brought completely to the lifecycle state of their host and any removed fragments will be torn down accordingly before this call returns. Committing a transaction in this way allows fragments to be added as dedicated, encapsulated components that monitor the lifecycle state of their host while providing firmer ordering guarantees around when those fragments are fully initialized and ready. Fragments that manage views will have those views created and attached.
Calling `commitNow` is preferable to calling `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commit()` followed by `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#executePendingTransactions()` as the latter will have the side effect of attempting to commit *all* currently pending transactions whether that is the desired behavior or not.
Transactions committed in this way may not be added to the FragmentManager's back stack, as doing so would break other expected ordering guarantees for other asynchronously committed transactions. This method will throw `https://developer.android.com/reference/java/lang/IllegalStateException.html` if the transaction previously requested to be added to the back stack with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)`.
A transaction can only be committed with this method prior to its containing activity saving its state. If the commit is attempted after that point, an exception will be thrown. This is because the state after the commit can be lost if the activity needs to be restored from its state. See `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitAllowingStateLoss()` for situations where it may be okay to lose the commit.
### commitNowAllowingStateLoss
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
@MainThread
abstract fun commitNowAllowingStateLoss(): Unit
```
Like `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitNow()` but allows the commit to be executed after an activity's state is saved. This is dangerous because the commit can be lost if the activity needs to later be restored from its state, so this should only be used for cases where it is okay for the UI state to change unexpectedly on the user.
### detach
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun detach(fragment: Fragment): FragmentTransaction
```
Detach the given fragment from the UI. This is the same state as when it is put on the back stack: the fragment is removed from the UI, however its state is still being actively managed by the fragment manager. When going into this state its view hierarchy is destroyed.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be detached. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### disallowAddToBackStack
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun disallowAddToBackStack(): FragmentTransaction
```
Disallow calls to `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)`. Any future calls to addToBackStack will throw `https://developer.android.com/reference/java/lang/IllegalStateException.html`. If addToBackStack has already been called, this method will throw IllegalStateException.
### hide
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun hide(fragment: Fragment): FragmentTransaction
```
Hides an existing fragment. This is only relevant for fragments whose views have been added to a container, as this will cause the view to be hidden.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be hidden. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### isAddToBackStackAllowed
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun isAddToBackStackAllowed(): Boolean
```
Returns true if this FragmentTransaction is allowed to be added to the back stack. If this method would return false, `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)` will throw `https://developer.android.com/reference/java/lang/IllegalStateException.html`.
| Returns |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | True if `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)` is permitted on this transaction. |
### isEmpty
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun isEmpty(): Boolean
```
| Returns |
|---|---|
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | `true` if this transaction contains no operations, `false` otherwise. |
### remove
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun remove(fragment: Fragment): FragmentTransaction
```
Remove an existing fragment. If it was added to a container, its view is also removed from that container.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be removed. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### replace
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun replace(containerViewId: @IdRes Int, fragment: Fragment): FragmentTransaction
```
Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,androidx.fragment.app.Fragment,java.lang.String)` with a null tag.
### replace
Added in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun replace(
containerViewId: @IdRes Int,
fragmentClass: Class,
args: Bundle?
): FragmentTransaction
```
Calls `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#replace(int,java.lang.Class,android.os.Bundle,java.lang.String)` with a null tag.
### replace
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun replace(containerViewId: @IdRes Int, fragment: Fragment, tag: String?): FragmentTransaction
```
Replace an existing fragment that was added to a container. This is essentially the same as calling `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#remove(androidx.fragment.app.Fragment)` for all currently added fragments that were added with the same containerViewId and then `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)` with the same arguments given here.
| Parameters |
|---|---|
| `containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Identifier of the container whose fragment(s) are to be replaced. |
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The new fragment to place in the container. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### replace
Added in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun replace(
containerViewId: @IdRes Int,
fragmentClass: Class,
args: Bundle?,
tag: String?
): FragmentTransaction
```
Replace an existing fragment that was added to a container. This is essentially the same as calling `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#remove(androidx.fragment.app.Fragment)` for all currently added fragments that were added with the same containerViewId and then `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(int,androidx.fragment.app.Fragment,java.lang.String)` with the same arguments given here.
| Parameters |
|---|---|
| `containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Identifier of the container whose fragment(s) are to be replaced. |
| `fragmentClass: https://developer.android.com/reference/java/lang/Class.html` | The new fragment to place in the container, created via the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#getFragmentFactory()`. |
| `args: https://developer.android.com/reference/android/os/Bundle.html?` | Optional arguments to be set on the fragment. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html?` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
### runOnCommit
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun runOnCommit(runnable: Runnable): FragmentTransaction
```
Add a Runnable to this transaction that will be run after this transaction has been committed. If fragment transactions are `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setReorderingAllowed(boolean)` this may be after other subsequent fragment operations have also taken place, or operations in this transaction may have been optimized out due to the presence of a subsequent fragment transaction in the batch.
If a transaction is committed using `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#commitAllowingStateLoss()` this runnable may be executed when the FragmentManager is in a state where new transactions may not be committed without allowing state loss.
`runOnCommit` may not be used with transactions `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)` as Runnables cannot be persisted with back stack state. `https://developer.android.com/reference/java/lang/IllegalStateException.html` will be thrown if `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)` has been previously called for this transaction or if it is called after a call to `runOnCommit`.
| Parameters |
|---|---|
| `runnable: https://developer.android.com/reference/java/lang/Runnable.html` | Runnable to add |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | this FragmentTransaction |
| Throws |
|---|---|
| `https://developer.android.com/reference/java/lang/IllegalStateException.html` | if `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#addToBackStack(java.lang.String)` has been called |
### setAllowOptimization
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun [setAllowOptimization](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setAllowOptimization(boolean))(allowOptimization: Boolean): FragmentTransaction
```
> [!CAUTION]
> **This function is deprecated.**
>
> This has been renamed `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setReorderingAllowed(boolean)`.
### setBreadCrumbShortTitle
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun [setBreadCrumbShortTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbShortTitle(int))(res: @StringRes Int): FragmentTransaction
```
> [!CAUTION]
> **This function is deprecated.**
>
> Store breadcrumb short titles separately from fragment transactions. For example, by using an `android:label` on a fragment in a navigation graph.
Set the short title to show as a bread crumb when this transaction is on the back stack.
| Parameters |
|---|---|
| `res: @https://developer.android.com/reference/kotlin/androidx/annotation/StringRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | A string resource containing the title. |
### setBreadCrumbShortTitle
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun [setBreadCrumbShortTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbShortTitle(java.lang.CharSequence))(text: CharSequence?): FragmentTransaction
```
> [!CAUTION]
> **This function is deprecated.**
>
> Store breadcrumb short titles separately from fragment transactions. For example, by using an `android:label` on a fragment in a navigation graph.
Like `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbShortTitle(int)` but taking a raw string; this method is *not* recommended, as the string can not be changed later if the locale changes.
### setBreadCrumbTitle
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun [setBreadCrumbTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbTitle(int))(res: @StringRes Int): FragmentTransaction
```
> [!CAUTION]
> **This function is deprecated.**
>
> Store breadcrumb titles separately from fragment transactions. For example, by using an `android:label` on a fragment in a navigation graph.
Set the full title to show as a bread crumb when this transaction is on the back stack.
| Parameters |
|---|---|
| `res: @https://developer.android.com/reference/kotlin/androidx/annotation/StringRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | A string resource containing the title. |
### setBreadCrumbTitle
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun [setBreadCrumbTitle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbTitle(java.lang.CharSequence))(text: CharSequence?): FragmentTransaction
```
> [!CAUTION]
> **This function is deprecated.**
>
> Store breadcrumb titles separately from fragment transactions. For example, by using an `android:label` on a fragment in a navigation graph.
Like `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setBreadCrumbTitle(int)` but taking a raw string; this method is *not* recommended, as the string can not be changed later if the locale changes.
### setCustomAnimations
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun setCustomAnimations(
enter: @AnimatorRes @AnimRes Int,
exit: @AnimatorRes @AnimRes Int
): FragmentTransaction
```
Set specific animation resources to run for the fragments that are entering and exiting in this transaction. These animations will not be played when popping the back stack.
This method applies the custom animations to all future fragment operations; previous operations are unaffected. Fragment operations in the same `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` can set different animations by calling this method prior to each operation, e.g:
```kotlin
fragmentManager.beginTransaction()
.setCustomAnimations(enter1, exit1)
.add(MyFragmentClass, args, tag1) // this fragment gets the first animations
.setCustomAnimations(enter2, exit2)
.add(MyFragmentClass, args, tag2) // this fragment gets the second animations
.commit()
```
| Parameters |
|---|---|
| `enter: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | An animation or animator resource ID used for the enter animation on the view of the fragment being added or attached. |
| `exit: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | An animation or animator resource ID used for the exit animation on the view of the fragment being removed or detached. |
### setCustomAnimations
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun setCustomAnimations(
enter: @AnimatorRes @AnimRes Int,
exit: @AnimatorRes @AnimRes Int,
popEnter: @AnimatorRes @AnimRes Int,
popExit: @AnimatorRes @AnimRes Int
): FragmentTransaction
```
Set specific animation resources to run for the fragments that are entering and exiting in this transaction. The `popEnter` and `popExit` animations will be played for enter/exit operations specifically when popping the back stack.
This method applies the custom animations to all future fragment operations; previous operations are unaffected. Fragment operations in the same `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` can set different animations by calling this method prior to each operation, e.g:
```kotlin
fragmentManager.beginTransaction()
.setCustomAnimations(enter1, exit1, popEnter1, popExit1)
.add(MyFragmentClass, args, tag1) // this fragment gets the first animations
.setCustomAnimations(enter2, exit2, popEnter2, popExit2)
.add(MyFragmentClass, args, tag2) // this fragment gets the second animations
.commit()
```
| Parameters |
|---|---|
| `enter: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | An animation or animator resource ID used for the enter animation on the view of the fragment being added or attached. |
| `exit: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | An animation or animator resource ID used for the exit animation on the view of the fragment being removed or detached. |
| `popEnter: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | An animation or animator resource ID used for the enter animation on the view of the fragment being readded or reattached caused by `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#popBackStack()` or similar methods. |
| `popExit: @https://developer.android.com/reference/kotlin/androidx/annotation/AnimatorRes @https://developer.android.com/reference/kotlin/androidx/annotation/AnimRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | An animation or animator resource ID used for the enter animation on the view of the fragment being removed or detached caused by `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#popBackStack()` or similar methods. |
### setMaxLifecycle
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun setMaxLifecycle(fragment: Fragment, state: Lifecycle.State): FragmentTransaction
```
Set a ceiling for the state of an active fragment in this FragmentManager. If fragment is already above the received state, it will be forced down to the correct state.
The fragment provided must currently be added to the FragmentManager to have it's Lifecycle state capped, or previously added as part of this transaction. If the `https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State#INITIALIZED` is passed in as the `https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State` and the provided fragment has already moved beyond `https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State#INITIALIZED`, an `https://developer.android.com/reference/java/lang/IllegalArgumentException.html` will be thrown.
If the `https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State#DESTROYED` is passed in as the `https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State` an `https://developer.android.com/reference/java/lang/IllegalArgumentException.html` will be thrown.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | the fragment to have it's state capped. |
| `state: https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle.State` | the ceiling state for the fragment. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | the same FragmentTransaction instance |
### setPrimaryNavigationFragment
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun setPrimaryNavigationFragment(fragment: Fragment?): FragmentTransaction
```
Set a currently active fragment in this FragmentManager as the primary navigation fragment.
The primary navigation fragment's `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#getChildFragmentManager()` will be called first to process delegated navigation actions such as `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#popBackStack()` if no ID or transaction name is provided to pop to. Navigation operations outside of the fragment system may choose to delegate those actions to the primary navigation fragment as returned by `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#getPrimaryNavigationFragment()`.
The fragment provided must currently be added to the FragmentManager to be set as a primary navigation fragment, or previously added as part of this transaction.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment?` | the fragment to set as the primary navigation fragment |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | the same FragmentTransaction instance |
### setReorderingAllowed
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun setReorderingAllowed(reorderingAllowed: Boolean): FragmentTransaction
```
Sets whether or not to allow optimizing operations within and across transactions. This will remove redundant operations, eliminating operations that cancel. For example, if two transactions are executed together, one that adds a fragment A and the next replaces it with fragment B, the operations will cancel and only fragment B will be added. That means that fragment A may not go through the creation/destruction lifecycle.
The side effect of removing redundant operations is that fragments may have state changes out of the expected order. For example, one transaction adds fragment A, a second adds fragment B, then a third removes fragment A. Without removing the redundant operations, fragment B could expect that while it is being created, fragment A will also exist because fragment A will be removed after fragment B was added. With removing redundant operations, fragment B cannot expect fragment A to exist when it has been created because fragment A's add/remove will be optimized out.
It can also reorder the state changes of Fragments to allow for better Transitions. Added Fragments may have `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#onCreate(android.os.Bundle)` called before replaced Fragments have `https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#onDestroy()` called.
`https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#postponeEnterTransition()` requires `setReorderingAllowed(true)`.
The default is `false`.
| Parameters |
|---|---|
| `reorderingAllowed: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-boolean/index.html` | `true` to enable optimizing out redundant operations or `false` to disable optimizing out redundant operations on this transaction. |
### setTransition
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun setTransition(transition: Int): FragmentTransaction
```
Select a standard transition animation for this transaction. May be one of `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_NONE()`, `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_OPEN()`, `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_CLOSE()`, or `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#TRANSIT_FRAGMENT_FADE()`.
### setTransitionStyle
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0) Deprecated in [1.2.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.2.0)
```
fun [setTransitionStyle](https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#setTransitionStyle(int))(styleRes: @StyleRes Int): FragmentTransaction
```
> [!CAUTION]
> **This function is deprecated.**
>
> The desired functionality never worked correctly. This should not be used.
Set a custom style resource that will be used for resolving transit animations.
### show
Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0)
```
fun show(fragment: Fragment): FragmentTransaction
```
Shows a previously hidden fragment. This is only relevant for fragments whose views have been added to a container, as this will cause the view to be shown.
| Parameters |
|---|---|
| `fragment: https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment` | The fragment to be shown. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same FragmentTransaction instance. |
## Extension functions
### FragmentTransaction.add
Artifact: [androidx.fragment:fragment](https://developer.android.com/jetpack/androidx/releases/fragment) [View Source](https://cs.android.com/search?q=file:androidx/fragment/app/FragmentTransaction.kt+function:add)
```
inline fun FragmentTransaction.add(tag: String, args: Bundle? = null): FragmentTransaction
```
Add a fragment to the associated `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager` without adding the Fragment to any container view.
The new fragment to be added will be created via the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentFactory` of the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager`.
| Parameters |
|---|---|
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html` | Tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| `args: https://developer.android.com/reference/android/os/Bundle.html? = null` | Optional arguments to be set on the fragment. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` instance. |
### FragmentTransaction.add
Artifact: [androidx.fragment:fragment](https://developer.android.com/jetpack/androidx/releases/fragment) [View Source](https://cs.android.com/search?q=file:androidx/fragment/app/FragmentTransaction.kt+function:add)
```
inline fun FragmentTransaction.add(
containerViewId: @IdRes Int,
tag: String? = null,
args: Bundle? = null
): FragmentTransaction
```
Add a fragment to the associated `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager`, inflating the Fragment's view into the container view specified by `https://developer.android.com/reference/kotlin/androidx/fragment/app/package-summary#(androidx.fragment.app.FragmentTransaction).add(kotlin.Int,kotlin.String,android.os.Bundle)`, to later retrieve via `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentById(int)`.
The new fragment to be added will be created via the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentFactory` of the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager`.
| Parameters |
|---|---|
| `containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Identifier of the container this fragment is to be placed in. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html? = null` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| `args: https://developer.android.com/reference/android/os/Bundle.html? = null` | Optional arguments to be set on the fragment. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` instance. |
### FragmentTransaction.replace
Artifact: [androidx.fragment:fragment](https://developer.android.com/jetpack/androidx/releases/fragment) [View Source](https://cs.android.com/search?q=file:androidx/fragment/app/FragmentTransaction.kt+function:replace)
```
inline fun FragmentTransaction.replace(
containerViewId: @IdRes Int,
tag: String? = null,
args: Bundle? = null
): FragmentTransaction
```
Replace an existing fragment that was added to a container. This is essentially the same as calling `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#remove(androidx.fragment.app.Fragment)` for all currently added fragments that were added with the same `containerViewId` and then `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction#add(java.lang.Class,android.os.Bundle,java.lang.String)` with the same arguments given here.
The new fragment to place in the container will be created via the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentFactory` of the `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager`.
| Parameters |
|---|---|
| `containerViewId: @https://developer.android.com/reference/kotlin/androidx/annotation/IdRes https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | Identifier of the container whose fragment(s) are to be replaced. |
| `tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html? = null` | Optional tag name for the fragment, to later retrieve the fragment with `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentManager#findFragmentByTag(java.lang.String)`. |
| `args: https://developer.android.com/reference/android/os/Bundle.html? = null` | Optional arguments to be set on the fragment. |
| Returns |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` | Returns the same `https://developer.android.com/reference/kotlin/androidx/fragment/app/FragmentTransaction` instance. |