ExploreByTouchHelper

class MyCustomView extends View {
    private MyExploreByTouchHelper mExploreByTouchHelper;

    public MyCustomView(Context context, ...) {
        ...
        mExploreByTouchHelper = new MyExploreByTouchHelper(this);
        ViewCompat.setAccessibilityDelegate(this, mExploreByTouchHelper);
    }

    @Override
    public boolean dispatchHoverEvent(MotionEvent event) {
      return mHelper.dispatchHoverEvent(this, event)
          || super.dispatchHoverEvent(event);
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
      return mHelper.dispatchKeyEvent(event)
          || super.dispatchKeyEvent(event);
    }

    @Override
    public void onFocusChanged(boolean gainFocus, int direction,
        Rect previouslyFocusedRect) {
      super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
      mHelper.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
    }
}