Stay organized with collections
Save and categorize content based on your preferences.
added in
version 1.0.0
belongs to Maven artifact android.arch.lifecycle:livedata-core:1.1.1
Observer
public
interface
Observer
| android.arch.lifecycle.Observer<T>
|
A simple callback that can receive from LiveData.
Summary
Public methods |
|---|
abstract
void
|
onChanged(T t)
Called when the data is changed.
|
Public methods
onChanged
void onChanged (T t)
Called when the data is changed.
| Parameters |
|---|
t |
T: The new data
|
Annotations
Interfaces
Classes
Enums
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# Observer\n\nadded in [version 1.0.0](/topic/libraries/support-library/revisions) \nbelongs to Maven artifact android.arch.lifecycle:livedata-core:1.1.1 \n\nObserver\n========\n\n| The `android.arch` Architecture Components packages are no longer maintained. They have been superseded by the corresponding [androidx.\\*](/jetpack/androidx/migrate) packages. See [androidx.lifecycle.Observer](/reference/androidx/lifecycle/Observer) instead.\n\n\n`\npublic\n\n\ninterface\nObserver\n`\n\n\n`\n\n\n`\n\n|--------------------------------------|\n| android.arch.lifecycle.Observer\\\u003cT\\\u003e |\n\n\u003cbr /\u003e\n\n*** ** * ** ***\n\nA simple callback that can receive from [LiveData](/reference/android/arch/lifecycle/LiveData). \n**See also:**\n\n- [LiveData - for a usage description.](/reference/android/arch/lifecycle/LiveData)\n\nSummary\n-------\n\n| ### Public methods ||\n|------------------|------------------------------------------------------------------------------------------------------------------|\n| ` abstract void` | ` `[onChanged](/reference/android/arch/lifecycle/Observer#onChanged(T))`(T t) ` Called when the data is changed. |\n\nPublic methods\n--------------\n\n### onChanged\n\nadded in [version 1.0.0](/topic/libraries/support-library/revisions) \n\n```\nvoid onChanged (T t)\n```\n\nCalled when the data is changed.\n\n\u003cbr /\u003e\n\n| Parameters ||\n|-----|--------------------------|\n| `t` | `T`: The new data \u003cbr /\u003e |\n\n-\n\n Annotations\n -----------\n\n - [OnLifecycleEvent](/reference/android/arch/lifecycle/OnLifecycleEvent)\n-\n\n Interfaces\n ----------\n\n - [DefaultLifecycleObserver](/reference/android/arch/lifecycle/DefaultLifecycleObserver)\n - [LifecycleObserver](/reference/android/arch/lifecycle/LifecycleObserver)\n - [LifecycleOwner](/reference/android/arch/lifecycle/LifecycleOwner)\n - [LifecycleRegistryOwner](/reference/android/arch/lifecycle/LifecycleRegistryOwner)\n - [Observer](/reference/android/arch/lifecycle/Observer)\n - [ViewModelProvider.Factory](/reference/android/arch/lifecycle/ViewModelProvider.Factory)\n - [ViewModelStoreOwner](/reference/android/arch/lifecycle/ViewModelStoreOwner)\n-\n\n Classes\n -------\n\n - [AndroidViewModel](/reference/android/arch/lifecycle/AndroidViewModel)\n - [Lifecycle](/reference/android/arch/lifecycle/Lifecycle)\n - [LifecycleRegistry](/reference/android/arch/lifecycle/LifecycleRegistry)\n - [LifecycleService](/reference/android/arch/lifecycle/LifecycleService)\n - [LiveData](/reference/android/arch/lifecycle/LiveData)\n - [LiveDataReactiveStreams](/reference/android/arch/lifecycle/LiveDataReactiveStreams)\n - [MediatorLiveData](/reference/android/arch/lifecycle/MediatorLiveData)\n - [MutableLiveData](/reference/android/arch/lifecycle/MutableLiveData)\n - [ProcessLifecycleOwner](/reference/android/arch/lifecycle/ProcessLifecycleOwner)\n - [ServiceLifecycleDispatcher](/reference/android/arch/lifecycle/ServiceLifecycleDispatcher)\n - [Transformations](/reference/android/arch/lifecycle/Transformations)\n - [ViewModel](/reference/android/arch/lifecycle/ViewModel)\n - [ViewModelProvider](/reference/android/arch/lifecycle/ViewModelProvider)\n - [ViewModelProvider.AndroidViewModelFactory](/reference/android/arch/lifecycle/ViewModelProvider.AndroidViewModelFactory)\n - [ViewModelProvider.NewInstanceFactory](/reference/android/arch/lifecycle/ViewModelProvider.NewInstanceFactory)\n - [ViewModelProviders](/reference/android/arch/lifecycle/ViewModelProviders)\n - [ViewModelProviders.DefaultFactory](/reference/android/arch/lifecycle/ViewModelProviders.DefaultFactory)\n - [ViewModelStore](/reference/android/arch/lifecycle/ViewModelStore)\n - [ViewModelStores](/reference/android/arch/lifecycle/ViewModelStores)\n-\n\n Enums\n -----\n\n - [Lifecycle.Event](/reference/android/arch/lifecycle/Lifecycle.Event)\n - [Lifecycle.State](/reference/android/arch/lifecycle/Lifecycle.State)"]]
