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);
}
}