InverseBindingMethod

public abstract @interface InverseBindingMethod
implements Annotation

android.databinding.InverseBindingMethod

---

InverseBindingMethod is used to identify how to listen for changes to a View property and which getter method to call. InverseBindingMethod should be associated with any class as part of InverseBindingMethods.

 @InverseBindingMethods({@InverseBindingMethod(
     type = android.widget.TextView.class,
     attribute = "android:text",
     event = "android:textAttrChanged",
     method = "getText")})
 public class MyTextViewBindingAdapters { ... }
 

method is optional. If it isn't provided, the attribute name is used to find the method name, either prefixing with "is" or "get". For the attribute android:text, data binding will search for a public CharSequence getText() method on TextView.

event is optional. If it isn't provided, the event name is assigned the attribute name suffixed with AttrChanged. For the android:text attribute, the default event name would be android:textAttrChanged. The event should be set using a BindingAdapter. For example:

 @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);
 }
 

Summary

Inherited methods

From interface java.lang.annotation.Annotation abstract Class<? extends Annotation> annotationType() Returns the annotation type of this annotation. abstract boolean equals(Object obj) Returns true if the specified object represents an annotation that is logically equivalent to this one. abstract int hashCode() Returns the hash code of this annotation, as defined below: The hash code of an annotation is the sum of the hash codes of its members (including those with default values), as defined below: The hash code of an annotation member is (127 times the hash code of the member-name as computed by hashCode()) XOR the hash code of the member-value, as defined below: The hash code of a member-value depends on its type: The hash code of a primitive value v is equal to WrapperType.valueOf(v).hashCode(), where WrapperType is the wrapper type corresponding to the primitive type of v (Byte, Character, Double, Float, Integer, Long, Short, or Boolean). abstract String toString() Returns a string representation of this annotation.