android - 如何将数据从 BroadcastReceiver 发送到 android 中的 Fragment

Question

我正在尝试制作一个聊天应用程序。我有一个 SlidingDrawer Activity ，它有很多 fragment ，其中 ChatFragment 是一个。现在当我发送消息到我的 friend ，我有一个 Chatting Window，如果任何消息来自 GCM 服务并且我在 ChatFragment 中，那么这条消息将转到该 fragment 并更新 ListView ，因为我想在聊天时收到任何消息时更新 chatWindow 现在我尝试像下面那样做。

GcmIntentService:

public class GcmIntentService extends IntentService {

    public GcmIntentService() {
        super("GcmIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Bundle extras = intent.getExtras();
        GoogleCloudMessaging gcm = GoogleCloudMessaging.getInstance(this);
        // The getMessageType() intent parameter must be the intent you received
        // in your BroadcastReceiver.
        String messageType = gcm.getMessageType(intent);

        if (extras != null && !extras.isEmpty()) {  // has effect of unparcelling Bundle
            // Since we're not using two way messaging, this is all we really to check for
            if (GoogleCloudMessaging.MESSAGE_TYPE_MESSAGE.equals(messageType)) {
                Logger.getLogger("GCM_RECEIVED").log(Level.INFO, extras.toString());

                showToast(extras.getString("message"));
                Intent sendData = new Intent("chatupdater");
                sendData.putExtra("msg", extras.getString("message"));
                LocalBroadcastManager.getInstance(this).sendBroadcast(sendData);
                Log.i("chat","i am in GCMIntentService");


            }
        }
        GcmBroadcastReceiver.completeWakefulIntent(intent);
    }

这里我在 onHandleIntent() 中启动一个 broadcastreceiver。

ChatBroadCastReceiver:

public class ChatBroadCastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("chat","I am in ChatBroadCastReceiver");
        String msg = intent.getStringExtra("msg");
        Log.i("chat",msg);



        //Intent data = new Intent("chatupdater");
        //Intent data = new Intent("chatupdater");
        //data.putExtra("key","data");
        //data.putInt("fragmentno",1); // Pass the unique id of fragment we talked abt earlier
        //context.sendBroadcast(intent);


    }
}

这是我的 ChatBroadCastReceiver 类，如果有任何消息到达，它会在 onReceive() 方法中成功接收。现在我想将此消息发送到 Fragment。我要做什么试过了，我用它注册了 fragment ，并试图在 ChatFragment 的 onReceive() 获取相同的数据。但它没有调用。我试图通过日志记录来查看.

public class ChatFragment extends Fragment {

    //ChatBroadCastReceiver mReceiver;
    private EditText et_chat;
    Bundle mailData;
    String caller_mail;
    private ListView chatListview;
    private ChatWindowAdapter chatWindowAdapter;
    private List<ChatSession>PreviousChatSession;
    private List<ChatInfo> chatListItems;
    Button chat_send;
    public ChatFragment() {

    }

    public BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i("chat","I am in BroadCastReceiver");
            String msg = intent.getStringExtra("msg");
            Toast.makeText(getActivity(),msg,Toast.LENGTH_LONG).show();
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        mReceiver = new ChatBroadCastReceiver();
        //getActivity().registerReceiver(new ChatBroadCastReceiver(),new IntentFilter("chatupdater"));
        LocalBroadcastManager.getInstance(getActivity()).registerReceiver(new ChatBroadCastReceiver(),new IntentFilter("chatupdater"));
        Log.i("chat", "I am in onCreate");

    }

现在如何将我在 Broadcastreceiver 中收到的消息发送到 ChatFragment 的 onReceive()？

Answer 1

试试这个

• 创建一个接口(interface)，该接口(interface)将具有这样的方法。

  公共(public)接口(interface) DemoListener {
public void receiveMessage(字符串消息);
}

现在在您的 fragment 中实现它并在 BroadcastReceiver 中注册监听器，现在只要您的广播接收器收到任何消息，您的 fragment 就可以通过此监听器使用它。
希望这个有帮助。