返回键, 长按事件

在Activity中重写方法

@Override  
public boolean onKeyDown(int keyCode, KeyEvent event) {  
// TODO Auto-generated method stub  
if(keyCode==KeyEvent.KEYCODE_BACK&&event.getRepeatCount()==0){  
    //需要处理  
}  
    return false;  
}  

@Override  
public boolean onKeyLongPress(int keyCode, KeyEvent event) {  
    if (keyCode == KeyEvent.KEYCODE_CALL) {  
        // a long press of the call key.  
        // do our work, returning true to consume it. by  
        // returning true, the framework knows an action has  
        // been performed on the long press, so will set the  
        // canceled flag for the following up event.  
        return true;  
    }  
    return super.onKeyLongPress(keyCode, event);  
}