Android之Home键监听封装

众所周知，我们监听返回键事件，无法是下面两个方法：

@Override  
    public void onBackPressed() {  
        //do something  
        //super.onBackPressed();  
    }  
      
    @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event) {  
        if(keyCode == KeyEvent.KEYCODE_BACK){  
            //do something  
        }  
        return super.onKeyDown(keyCode, event);  
    }  

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