Android 事件触发机制的深入学习

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;     }   } }