# InverseBindingAdapter

Summary:[Methods](https://developer.android.com/reference/android/databinding/InverseBindingAdapter#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/databinding/InverseBindingAdapter#inhmethods)\|[\[Expand All\]](https://developer.android.com/reference/android/databinding/InverseBindingAdapter#)  

# InverseBindingAdapter

`
public


abstract
@interface
InverseBindingAdapter
`  
`


implements

`[Annotation](http://developer.android.com/reference/java/lang/annotation/Annotation.html)`


`

|-------------------------------------------|
| android.databinding.InverseBindingAdapter |

<br />

*** ** * ** ***

InverseBindingAdapter is associated with a method used to retrieve the value for a View when setting values gathered from the View. This is similar to[BindingAdapter](https://developer.android.com/reference/android/databinding/BindingAdapter)s:  

```
 @InverseBindingAdapter(attribute = "android:text", event = "android:textAttrChanged")
 public static String captureTextValue(TextView view, CharSequence originalValue) {
     CharSequence newValue = view.getText();
     CharSequence oldValue = value.get();
     if (oldValue == null) {
         value.set(newValue);
     } else if (!contentEquals(newValue, oldValue)) {
         value.set(newValue);
     }
 }
 
```

The default value for event is the attribute name suffixed with "AttrChanged". In the above example, the default value would have been`android:textAttrChanged`even if it wasn't provided.

The event attribute is used to notify the data binding system that the value has changed. The developer will typically create a[BindingAdapter](https://developer.android.com/reference/android/databinding/BindingAdapter)to assign the event. For example:

<br />

```
 @BindingAdapter(value = {"android:beforeTextChanged", "android:onTextChanged",
                          "android:afterTextChanged", "android:textAttrChanged"},
                          requireAll = false)
 public static void setTextWatcher(TextView view, final BeforeTextChanged before,
                                   final OnTextChanged on, final AfterTextChanged after,
                                   final InverseBindingListener textAttrChanged) {
     TextWatcher newValue = new TextWatcher() {
         ...
         @Override
         public void onTextChanged(CharSequence s, int start, int before, int count) {
             if (on != null) {
                 on.onTextChanged(s, start, before, count);
             }
             if (textAttrChanged != null) {
                 textAttrChanged.onChange();
             }
         }
     }
     TextWatcher oldValue = ListenerUtil.trackListener(view, newValue, R.id.textWatcher);
     if (oldValue != null) {
         view.removeTextChangedListener(oldValue);
     }
     view.addTextChangedListener(newValue);
 }
 
```

Like`BindingAdapter`s, InverseBindingAdapter methods may also take[DataBindingComponent](https://developer.android.com/reference/android/databinding/DataBindingComponent)as the first parameter and may be an instance method with the instance retrieved from the`DataBindingComponent`.  
**See also:**

- [setDefaultComponent(DataBindingComponent)](https://developer.android.com/reference/android/databinding/DataBindingUtil#setDefaultComponent(android.databinding.DataBindingComponent))
- [InverseBindingMethod](https://developer.android.com/reference/android/databinding/InverseBindingMethod)

## Summary

|                                                                                                                 ### Public methods                                                                                                                 ||
|---------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` `[String](http://developer.android.com/reference/java/lang/String.html) | ` `[attribute](https://developer.android.com/reference/android/databinding/InverseBindingAdapter#attribute())`() ` The attribute that the value is to be retrieved for. |
| ` `[String](http://developer.android.com/reference/java/lang/String.html) | ` `[event](https://developer.android.com/reference/android/databinding/InverseBindingAdapter#event())`() ` The event used to trigger changes.                           |

| ### Inherited methods |
|-----------------------|---|
| [![](https://developer.android.com/static/assets/images/styles/disclosure_down.png)](https://developer.android.com/reference/android/databinding/InverseBindingAdapter#)From interface` `[java.lang.annotation.Annotation](http://developer.android.com/reference/java/lang/annotation/Annotation.html)` ` |-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------| | ` abstract `[Class](http://developer.android.com/reference/java/lang/Class.html)`<? extends `[Annotation](http://developer.android.com/reference/java/lang/annotation/Annotation.html)`>` | ` annotationType() `                                                                      | | ` abstract boolean`                                                                                                                                                                       | ` equals(`[Object](http://developer.android.com/reference/java/lang/Object.html)` arg0) ` | | ` abstract int`                                                                                                                                                                           | ` hashCode() `                                                                            | | ` abstract `[String](http://developer.android.com/reference/java/lang/String.html)                                                                                                        | ` toString() `                                                                            | ||

## Public methods

### attribute

```
String attribute ()
```

The attribute that the value is to be retrieved for.

<br />

|                                    Returns                                     ||
|------------------------------------------------------------------------|--------|
| [String](http://developer.android.com/reference/java/lang/String.html) | <br /> |

### event

```
String event ()
```

The event used to trigger changes. This is used in[BindingAdapter](https://developer.android.com/reference/android/databinding/BindingAdapter)s for the data binding system to set the event listener when two-way binding is used.

<br />

|                                    Returns                                     ||
|------------------------------------------------------------------------|--------|
| [String](http://developer.android.com/reference/java/lang/String.html) | <br /> |

-

  ## Annotations

  - [Bindable](https://developer.android.com/reference/android/databinding/Bindable)
  - [BindingAdapter](https://developer.android.com/reference/android/databinding/BindingAdapter)
  - [BindingConversion](https://developer.android.com/reference/android/databinding/BindingConversion)
  - [BindingMethod](https://developer.android.com/reference/android/databinding/BindingMethod)
  - [BindingMethods](https://developer.android.com/reference/android/databinding/BindingMethods)
  - [InverseBindingAdapter](https://developer.android.com/reference/android/databinding/InverseBindingAdapter)
  - [InverseBindingMethod](https://developer.android.com/reference/android/databinding/InverseBindingMethod)
  - [InverseBindingMethods](https://developer.android.com/reference/android/databinding/InverseBindingMethods)
  - [InverseMethod](https://developer.android.com/reference/android/databinding/InverseMethod)
-

  ## Interfaces

  - [DataBindingComponent](https://developer.android.com/reference/android/databinding/DataBindingComponent)
  - [InverseBindingListener](https://developer.android.com/reference/android/databinding/InverseBindingListener)
  - [Observable](https://developer.android.com/reference/android/databinding/Observable)
  - [ObservableList](https://developer.android.com/reference/android/databinding/ObservableList)
  - [ObservableMap](https://developer.android.com/reference/android/databinding/ObservableMap)
-

  ## Classes

  - [BaseObservable](https://developer.android.com/reference/android/databinding/BaseObservable)
  - [CallbackRegistry](https://developer.android.com/reference/android/databinding/CallbackRegistry)
  - [CallbackRegistry.NotifierCallback](https://developer.android.com/reference/android/databinding/CallbackRegistry.NotifierCallback)
  - [DataBindingUtil](https://developer.android.com/reference/android/databinding/DataBindingUtil)
  - [ListChangeRegistry](https://developer.android.com/reference/android/databinding/ListChangeRegistry)
  - [MapChangeRegistry](https://developer.android.com/reference/android/databinding/MapChangeRegistry)
  - [MergedDataBinderMapper](https://developer.android.com/reference/android/databinding/MergedDataBinderMapper)
  - [Observable.OnPropertyChangedCallback](https://developer.android.com/reference/android/databinding/Observable.OnPropertyChangedCallback)
  - [ObservableArrayList](https://developer.android.com/reference/android/databinding/ObservableArrayList)
  - [ObservableArrayMap](https://developer.android.com/reference/android/databinding/ObservableArrayMap)
  - [ObservableBoolean](https://developer.android.com/reference/android/databinding/ObservableBoolean)
  - [ObservableByte](https://developer.android.com/reference/android/databinding/ObservableByte)
  - [ObservableChar](https://developer.android.com/reference/android/databinding/ObservableChar)
  - [ObservableDouble](https://developer.android.com/reference/android/databinding/ObservableDouble)
  - [ObservableField](https://developer.android.com/reference/android/databinding/ObservableField)
  - [ObservableFloat](https://developer.android.com/reference/android/databinding/ObservableFloat)
  - [ObservableInt](https://developer.android.com/reference/android/databinding/ObservableInt)
  - [ObservableList.OnListChangedCallback](https://developer.android.com/reference/android/databinding/ObservableList.OnListChangedCallback)
  - [ObservableLong](https://developer.android.com/reference/android/databinding/ObservableLong)
  - [ObservableMap.OnMapChangedCallback](https://developer.android.com/reference/android/databinding/ObservableMap.OnMapChangedCallback)
  - [ObservableParcelable](https://developer.android.com/reference/android/databinding/ObservableParcelable)
  - [ObservableShort](https://developer.android.com/reference/android/databinding/ObservableShort)
  - [OnRebindCallback](https://developer.android.com/reference/android/databinding/OnRebindCallback)
  - [PropertyChangeRegistry](https://developer.android.com/reference/android/databinding/PropertyChangeRegistry)
  - [ViewDataBinding](https://developer.android.com/reference/android/databinding/ViewDataBinding)
  - [ViewStubProxy](https://developer.android.com/reference/android/databinding/ViewStubProxy)