事件的传播顺序

2015-03-19 09:39 徐亮阅读(158) 评论(0) 编辑收藏举报

public class MyButton extends Button
{
   public MyButton(Context context , AttributeSet set)
   {
       super(context , set);
   }
   @Override
   public boolean onKeyDown(int keyCode, KeyEvent event)
   {
       super.onKeyDown(keyCode , event);
       Log.v("-MyButton-" , "the onKeyDown in MyButton");
       return false;
   }

class MyActivity{

myButton.setOnKeyListener(new OnKeyListener()
       {
           @Override
           public boolean onKey(View source
                   , int keyCode, KeyEvent event)
           {
                   Log.v("-Listener-", "the onKeyDown in Listener");
               }
               return false;
           }
       });

　　public boolean onKeyDown(int keyCode, KeyEvent event)
   {
       super.onKeyDown(keyCode , event);
       Log.v("-Activity-" , "the onKeyDown in Activity");
       return false;
   }

}

android系统最先触发的是按键上绑定的监听器

然后触发按键的回调

最后触发activity上的回调