Activity调用dispatchTouchEvent()和onTouchEvent()方法

来源：互联网发布：抑郁知乎编辑：程序博客网时间：2024/06/05 02:32

public class MyTextView extends TextView {public MyTextView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public MyTextView(Context context, AttributeSet attrs) {super(context, attrs);}public MyTextView(Context context) {super(context);}@Overridepublic boolean onTouchEvent(MotionEvent event) {int action = event.getAction();switch (action) {case MotionEvent.ACTION_DOWN:Log.e("TAG", "down");break;case MotionEvent.ACTION_UP:Log.e("TAG", "up");break;case MotionEvent.ACTION_MOVE:Log.e("TAG", "move");break;default:break;}return super.onTouchEvent(event);}}

在Activity中有一个自定义的MyTextView，重写Activity的如下方法：

@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {Log.e(MainActivity.class.getSimpleName(), "dispatchTouchEvent");return super.dispatchTouchEvent(ev);}@Overridepublic boolean onTouchEvent(MotionEvent event) {Log.e(MainActivity.class.getSimpleName(), "onTouchEvent");return super.onTouchEvent(event);}

事件从Activity的dispatchTouchEvent()方法开始传递，当没有Activity中没有view响应此事件的时候。

07-08 15:26:59.488: E/MainActivity(28247): dispatchTouchEvent07-08 15:26:59.488: E/TAG(28247): down07-08 15:26:59.488: E/MainActivity(28247): onTouchEvent07-08 15:26:59.518: E/MainActivity(28247): dispatchTouchEvent07-08 15:26:59.518: E/MainActivity(28247): onTouchEvent07-08 15:26:59.548: E/MainActivity(28247): dispatchTouchEvent07-08 15:26:59.548: E/MainActivity(28247): onTouchEvent07-08 15:26:59.548: E/MainActivity(28247): dispatchTouchEvent07-08 15:26:59.548: E/MainActivity(28247): onTouchEvent

（1）从这里可以看到当事件没有被MyTextView消费的时候，Activity的onTouchEvent()方法被调用。

当加入了如下的代码

txt.setOnClickListener(this);}@Overridepublic void onClick(View v) {if (R.id.txt == v.getId()) {Toast.makeText(this, "txt", 1).show();}}

输出如下：

07-08 15:39:52.613: E/MainActivity(29592): dispatchTouchEvent07-08 15:39:52.613: E/TAG(29592): down07-08 15:39:52.653: E/MainActivity(29592): dispatchTouchEvent07-08 15:39:52.653: E/TAG(29592): move07-08 15:39:52.663: E/MainActivity(29592): dispatchTouchEvent07-08 15:39:52.663: E/TAG(29592): move07-08 15:39:52.673: E/MainActivity(29592): dispatchTouchEvent07-08 15:39:52.673: E/TAG(29592): up

（2）当事件被MyTextView消费了，Activity的onTouchEvent()方法将不被调用。

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