To create a Behavior just extend the CoordinatorLayout.Behavior (opens new window) class.

Extend the CoordinatorLayout.Behavior

Example:

public class MyBehavior<V extends View> extends CoordinatorLayout.Behavior<V> {

      /**
       * Default constructor.
       */
      public MyBehavior() {
      }
    
      /**
       * Default constructor for inflating a MyBehavior from layout.
       *
       * @param context The {@link Context}.
       * @param attrs The {@link AttributeSet}.
       */
      public MyBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
      }
}

This behavior need to be attached to a child View of a CoordinatorLayout to be called.

Attach a Behavior programmatically

MyBehavior myBehavior = new MyBehavior();
CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) view.getLayoutParams();
params.setBehavior(myBehavior);

Attach a Behavior in XML

You can use the layout_behavior attribute to attach the behavior in XML:

<View
  android:layout_height="...."
  android:layout_width="...."
  app:layout_behavior=".MyBehavior" />

Attach a Behavior automatically

If you are working with a custom view you can attach the behavior using the @CoordinatorLayout.DefaultBehavior annotation:

@CoordinatorLayout.DefaultBehavior(MyBehavior.class)
public class MyView extends ..... {

}

The SwipeDismissBehavior (opens new window) works on any View and implements the functionality of swipe to dismiss in our layouts with a CoordinatorLayout.

Just use:

       final SwipeDismissBehavior<MyView> swipe = new SwipeDismissBehavior();

        //Sets the swipe direction for this behavior.
        swipe.setSwipeDirection(
            SwipeDismissBehavior.SWIPE_DIRECTION_ANY);

        //Set the listener to be used when a dismiss event occurs
        swipe.setListener(
            new SwipeDismissBehavior.OnDismissListener() {
            @Override public void onDismiss(View view) {
                //......
            }

            @Override 
            public void onDragStateChanged(int state) {
                //......
            }
        });

        //Attach the SwipeDismissBehavior to a view
        LayoutParams coordinatorParams = 
            (LayoutParams) mView.getLayoutParams();    
        coordinatorParams.setBehavior(swipe);

You can use the CoordinatorLayout.Behavior (opens new window) to create dependencies between views. You can anchor a View to another View by:

• using the layout_anchor (opens new window) attribute.
• creating a custom Behavior and implementing the layoutDependsOn (opens new window) method returning true.

For example, in order to create a Behavior for moving an ImageView when another one is moved (example Toolbar), perform the following steps:

public class MyBehavior extends CoordinatorLayout.Behavior<ImageView> {...}

@Override
public boolean layoutDependsOn(CoordinatorLayout parent, 
        ImageView child, View dependency) {
    // Returns true to add a dependency.
    return dependency instanceof Toolbar;
}

@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, ImageView child, View dependency) {
    // Implement here animations, translations, or movements; always related to the provided dependency.
    float translationY = Math.min(0, dependency.getTranslationY() - dependency.getHeight()); 
    child.setTranslationY(translationY);
}

Remarks

The CoordinatorLayout (opens new window) is a container that extends the FrameLayout.
By attaching a CoordinatorLayout.Behavior (opens new window) to a direct child of CoordinatorLayout, you’ll be able to intercept touch events, window insets, measurement, layout, and nested scrolling.

By specifying Behaviors (opens new window) for child views of a CoordinatorLayout you can provide many different interactions within a single parent and those views can also interact with one another. View classes can specify a default behavior when used as a child of a CoordinatorLayout using the DefaultBehavior annotation.