Android 事件触发机制的深入学习
最近在研究android的事件触发和传播机制，说来很惭愧，web下的事件太熟悉不过了，可在android中却很郁闷，常用的触摸事件都糊里糊涂的，在网上看了半天，也整理一份，供大家参考：
public class CustomDefaultActivity implements OnTouchListener {
private GestureDetector gd1;
private TableLayout tableLayout;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_default);
tableLayout = (TableLayout) findViewById(R.id.tableLayout);
gd1 = new GestureDetector(CustomDefaultActivity.this, new MyGesture());
tableLayout.setOnTouchListener(this);
tableLayout.setLongClickable(true);
}
@Override public boolean dispatchTouchEvent(MotionEvent event) {
Log.e("-----------------------------------------------------------------------", "dispatchTouchEvent");
if (gd1.onTouchEvent(event)) {
event.setAction(MotionEvent.ACTION_CANCEL);
}
return super.dispatchTouchEvent(event);
}
@Override public boolean onTouch(View arg0, MotionEvent arg1) {
Log.e("-------", "onTouch");
return gd1.onTouchEvent(arg1);
}
public class MyGesture implements OnGestureListener {
@Override public boolean onDown(MotionEvent arg0) {
Log.e("-------", "onDown, 按下时触发[" + arg0.getX() + "," + arg0.getY() + "]");
return true;
}
@Override public void onLongPress(MotionEvent arg0) {
Log.e("-------", "onLongPress,长时间按住时触发");
}
@Override public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) {
Log.e("-------", "onScroll,滑动拖动事件[" + arg0.getX() + "," + arg0.getY() + "]=[" + arg1.getX() + "," + arg1.getY() + "]");
return true;
}
@Override public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2, float arg3) {
Log.e("-------", "onFling, 滑动甩出事件");
return true;
}
@Override public void onShowPress(MotionEvent arg0) {
Log.e("-------", "onShowPress,down事件发生,而move或up还没发生前触发该事件");
}
@Override public boolean onSingleTapUp(MotionEvent arg0) {
Log.e("-------", "onSingleTapUp 释放事件");
return true;
}
}
}
监控触摸事件，主要是实现OnGestureListener类，并重写其中的几个方法，以监听事件发生。
感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！
