Android onKeyDown监听返回键无效的解决办法

 android onkeydown监听返回键无效的解决办法

当我们的activity继承了tabactivity,在该类中重写onkeydown是监听不到返回键的,

具体解决方法如下:

重写dispatchkeyevent

/** 
 * 退出 
 */ 
@override 
public boolean dispatchkeyevent(keyevent event) { 
  if (event.getkeycode() == keyevent.keycode_back 
      && event.getaction() == keyevent.action_down 
      && event.getrepeatcount() == 0) {       
    //具体的操作代码 
  } 
  return super.dispatchkeyevent(event); 
} 

如果仅仅是监听某个activity的后退键,只需要覆写该方法即可.

@override 
public void onbackpressed() { 
  super.onbackpressed(); 
} 

我们可以看看super.onbackpressed()方法默认的实现:

/** 
 * called when the activity has detected the user's press of the back 
 * key. the default implementation simply finishes the current activity, 
 * but you can override this to do whatever you want. 
 */ 
public void onbackpressed() { 
  finish(); 
} 

如果想屏蔽后退键只需要把super.onbackpressed()方法注释即可

但是该方法不适用于tabactivity.

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