Android 事件触发机制的深入学习

 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。

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