TouchDelegate

TouchDelegate(Rect bounds, View delegateView)

Parameters:

bounds Bounds in local coordinates of the containing view that should be mapped to the delegate view

delegateView The view that should receive motion events

 

public class TouchDelegateActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.touch_delegate);
        
        View parentView = findViewById(R.id.parent_layout);

        parentView.post(new Runnable() {
            @Override
            public void run() {
                Rect delegateArea = new Rect();
                ImageButton myButton = (ImageButton) findViewById(R.id.button);
                myButton.setEnabled(true);
                myButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Toast.makeText(TouchDelegateActivity.this,"click",Toast.LENGTH_SHORT).show();
                    }
                });

                myButton.getHitRect(delegateArea);

                // 在ImageButton边框的右边和底边扩展触摸区域
                delegateArea.right += 200;
                delegateArea.bottom += 200;

                TouchDelegate touchDelegate = new TouchDelegate(delegateArea, myButton);

                // Sets the TouchDelegate on the parent view, such that touches 
                // within the touch delegate bounds are routed to the child.
                if (View.class.isInstance(myButton.getParent())) {
                    ((View) myButton.getParent()).setTouchDelegate(touchDelegate);
                }
            }
        });
    }
}

 

2.布局文件 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/parent_layout"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

     <ImageButton android:id="@+id/button"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:background="@null"
          android:src="@drawable/icon" />
</RelativeLayout>