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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