Android 实现在Activity中操作刷新另外一个Activity数据列表

做android项目中遇到这样一个问题：有两个acticity,一个显示好友列表，另外一个显示会话列表，现在问题是在会话界面增加一个添加好友功能，添加好友后要求实时的刷新好友列表。

想了想，找了两种方式

方法一：通过声明要刷新的activity（FriendActivity）为静态变量，然后在一个activity（SessionActivity）中直接调用刷新方法

在FriendActivity中声明静态变量

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1. public static FriendActivity instance = null; 
2. @Override 
3. protected void onCreate(Bundle savedInstanceState) { 
4.     super.onCreate(savedInstanceState); 
5.     setContentView(R.layout.activity_main); 
6.     instance = this;     
7.     initViews(); 
8. } 

    public static FriendActivity instance = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        instance = this;    
        initViews();
    }

在SessionActivity中直接调用FriendActivity中的刷新好友列表方法即可：

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1. @Override 
2. protected void onActivityResult(int requestCode, int resultCode, Intent intent) { 
3.     if (requestCode == REQUEST_CODE_NEW_CONTACT && resultCode == RESULT_OK) { 
4.         FriendActivity.instance.reFreshFriendList(); 
5.     } 
6. } 

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        if (requestCode == REQUEST_CODE_NEW_CONTACT && resultCode == RESULT_OK) {
            FriendActivity.instance.reFreshFriendList();
        }
    }

当然，这种方式使用的是静态变量，你需要及时释放内存。

第二种方法：使用广播机制，在SessionActivity添加好友时进行广播，而FriendActivity中通过动态注册广播消息进行receive，当接受到消息时，在FriendActivity中自己进行更新

SessionActivity添加好友时进行广播：

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1. // 广播通知 
2.          Intent intent = new Intent(); 
3.          intent.setAction("action.refreshFriend"); 
4.          sendBroadcast(intent); 

// 广播通知
         Intent intent = new Intent();
         intent.setAction("action.refreshFriend");
         sendBroadcast(intent);

FriendActivity中通过动态注册广播消息

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1. @Override 
2.   protected void onCreate(Bundle savedInstanceState) { 
3.       super.onCreate(savedInstanceState); 
4.       setContentView(R.layout.activity_main); 
5.        
6.       IntentFilter intentFilter = new IntentFilter(); 
7.       intentFilter.addAction("action.refreshFriend"); 
8.       registerReceiver(mRefreshBroadcastReceiver, intentFilter); 
9.        
10.       initViews(); 
11.   } 
12.   // broadcast receiver 
13.   private BroadcastReceiver mRefreshBroadcastReceiver = new BroadcastReceiver() { 
14.  
15.       @Override 
16.       public void onReceive(Context context, Intent intent) { 
17.           String action = intent.getAction(); 
18.           if (action.equals("action.refreshFriend")) 
19.           { 
20.               reFreshFrinedList(); 
21.           } 
22.       } 
23.   }; 

  @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("action.refreshFriend");
        registerReceiver(mRefreshBroadcastReceiver, intentFilter);
        
        initViews();
    }
    // broadcast receiver
    private BroadcastReceiver mRefreshBroadcastReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals("action.refreshFriend"))
            {
                reFreshFrinedList();
            }
        }
    };

这样就很好的实现了在一个Activity中实时刷新另外一个Activity数据列表，这种方式更加的灵活方便。

最后，不要忘记销毁注册

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1. @Override 
2.    protected void onDestroy() { 
3.        super.onDestroy(); 
4.        unregisterReceiver(mRefreshBroadcastReceiver); 
5.    }