TouchDelegate

/** * Helper class to handle situations where you want a view to have a larger touch area than its * actual view bounds. The view whose touch area is changed is called the delegate view. This * class should be used by an ancestor of the delegate. To use a TouchDelegate, first create an * instance that specifies the bounds that should be mapped to the delegate and the delegate * view itself. * <p> * The ancestor should then forward all of its touch events received in its * {@link android.view.View#onTouchEvent(MotionEvent)} to {@link #onTouchEvent(MotionEvent)}. * </p> *

简单点说，就是一般我们只能Click这个View2的时候，View2才响应，但是我们想要Click这个View1的Bounds内，这个View2也要响应。

就是这么简单。。。

所以我们使用时候有：(注：bounds以view1为坐标)

TouchDelegate td = new TouchDelegate(bounds,  view2);
view1.setTouchDelegate(td);

eg：点击iv1，iv2产生效果

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

    <ImageView
        android:id="@+id/iv1"
        android:layout_width="120dp"
        android:layout_height="100dp"
        android:layout_marginLeft="100dp"
        android:background="@drawable/list_item_bg" >
    </ImageView>

    <ImageView
        android:id="@+id/iv2"
        android:layout_width="120dp"
        android:layout_height="100dp"
        android:layout_below="@id/iv1"
        android:background="@drawable/night_list_item_bg" >
    </ImageView>

</RelativeLayout>

java：

           Rect rect = new Rect(0, 0, iv1.getWidth(), iv1
                                .getHeight());
                        System.out.println(rect.toString());
                        iv1.setTouchDelegate(new TouchDelegate(rect, iv2));