touch事件分发

public class MyActivity extends Activity {
    private Button btn_test;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);
        btn_test = (Button)findViewById (R.id.btn_test);
        btn_test.setOnClickListener (new View.OnClickListener () {
            @Override
            public void onClick (View view) {
            Log.d ("flw===>","onClick");
            }
        });
        btn_test.setOnTouchListener (new View.OnTouchListener () {
            @Override
            public boolean onTouch (View view, MotionEvent motionEvent) {
                Log.d ("flw===>","onTouch--"+motionEvent.getAction ());
                return false;
            }
        });
    }

    @Override
    public boolean dispatchTouchEvent (MotionEvent ev) {
        Log.d ("flw===>","dispatchTouchEvent--"+ev.getAction ());
        return super.dispatchTouchEvent (ev);
    }

  
}

1.点击屏幕，log为dispatchTouchEvent--0
 dispatchTouchEvent--2
 dispatchTouchEvent--2
 dispatchTouchEvent--1

0,1,2分别代表： public static final int ACTION_DOWN = 0;
    public static final int ACTION_UP = 1;
    public static final int ACTION_MOVE = 2;

2.点击按钮，log为dispatchTouchEvent--0
 onTouch--0
dispatchTouchEvent--1
onTouch--1
onClick

dispatchTouchEvent 的返回值改为false或者true，button都接收不到事件了。返回super.xxx接收正常。

onTouch 返回false，可接收到click，true接收不到。true代表点击事件被ontouch截获。