Android中onTouch与onClick事件的关系

这几天遇到点关于Android的触摸事件相关的，还跟onClick有关，暂且记下：

LinearLayout分别设置了onTouchListener，onClickListener，onLongClickListener及onTouchEvent回调

1、在屏幕上触摸之后基本的执行流程如下：

onTouch,action=0
onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1
onClick

也就是先说onTouchListener是最先被触发的，然后是本身的onTouchEvent回调；当最后的up事件发生并被onTouchEvent处理后才会触发onClickListener。

2、把onTouchEvent回调中的super.onTouchEvent去除，直接返回true；则流程如下：

onTouch,action=0
onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1

可以看到onClickListener永远无法被触发，也侧面说明了对onClick的触发是在onTouchEvent回调中来实现的。

3、长按屏幕，流程如下：

onTouch,action=0
onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onLongClick
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1
onClick

当长按的时候，无需到up就会触发onLongClick的响应，但之后也会继续触发onClick的响应。

4、但如果在onLongClick中返回true，则流程如下，即只在中间触发了onLongClick，之后会继续响应touch，但当up的时候就不会再触发onClick

onTouch,action=0

onTouchEvent,action=0
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onLongClick
onTouch,action=2
onTouchEvent,action=2
onTouch,action=2
onTouchEvent,action=2
onTouch,action=1
onTouchEvent,action=1

测试代码如下：

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        FrameLayout frame = (FrameLayout)findViewById(R.id.container);        LinearLayoutTest line = new LinearLayoutTest(this);        line.setOnClickListener(new ClickListener());        line.setOnLongClickListener(new LongClickListener());        line.setOnTouchListener(new TouchListener());        line.setLongClickable(true);        frame.addView(line);    }    public class ClickListener implements OnClickListener {        @Override        public void onClick(View v) {            Log.e("test","onClick");        }    }    public class LongClickListener implements OnLongClickListener{        @Override        public boolean onLongClick(View v) {            Log.e("test","onLongClick");            return true;        }    }    public class TouchListener implements OnTouchListener{        @Override        public boolean onTouch(View v, MotionEvent event) {            Log.e("test","onTouch,action="+event.getAction());            return false;        }     }        }

public class LinearLayoutTest extends LinearLayout{    public LinearLayoutTest(Context context) {        super(context);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        Log.e("test","onTouchEvent,action="+event.getAction());        return super.onTouchEvent(event);    }}

更多相关文章

随机推荐