Android 事件触发机制学习

做了6年的.NET/Web开发，去年转入Java，说起原因也很简单，就是为了想学学Java和Android。跳槽过后，工资比以前还少了很多，但也学到了很多。常言道“有得必有失”！

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。