从服务的Andr​​oid调用BroadcastReceiver的片段中更新UI？ [英] Calling BroadCastReceiver from Service in android to Update UI in Fragment?

问题描述

我要更新片段 UI 从服务。我现在用 GCM 发送message.I有这个类 GCM ：

I want to update the UI of a fragment from service.I am using GCM for sending message.I have this class for GCM:

    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"));
                    sendBroadcast(sendData);


                }
            }
   GcmBroadcastReceiver.completeWakefulIntent(intent);
        }

在 onHandleIntent（）方法我广播消息到注册到广播接收器片段。我有有一个 SlidingDrawerActivity 键，它有许多片段和 ChatFragment 是想从<$ C发送这封邮件them.I之一$ C> GCMIntentService 到 ChatFragmen T。结果

In the onHandleIntent() method i broadcasted the message to a fragment which is registered to BroadCastReceiver.I have one SlidingDrawerActivity and it has many Fragments and ChatFragment is one of them.I want to send this message from GCMIntentService to ChatFragment.

我的ChatFragment类：

public class ChatFragment extends Fragment {

    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() {

    }

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        getActivity().registerReceiver(new ChatBroadCastReceiver(),new IntentFilter("chatupdater"));

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.chat_window, null, false);
        et_chat = (EditText) v.findViewById(R.id.et_chat);
        chat_send = (Button) v.findViewById(R.id.bt_chat_send);
        chatListview = (ListView)v.findViewById(R.id.chat_listView);
        chatListItems = new ArrayList<ChatInfo>();
        chatWindowAdapter = new ChatWindowAdapter(getActivity(),chatListItems);
        chatListview.setAdapter(chatWindowAdapter);
        mailData=getArguments();
        caller_mail = mailData.getString(PropertyNames.Userinfo_Mail.getProperty());

        retrieveChats();

        chat_send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ChatInfo chatInfo= new ChatInfo();
                chatInfo.setChat_text(et_chat.getText().toString());
                chatInfo.setDirection("right");
                chatListItems.add(chatInfo);
                chatWindowAdapter.notifyDataSetChanged();

                fetchID(caller_mail);
            }
        });

        return v;
    }

    private final BroadcastReceiver receiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
             String msg = intent.getStringExtra("msg");
             Toast.makeText(getActivity(),msg,Toast.LENGTH_LONG).show();
        }
    };

我的ChatBroadCastReceiver班chatFragment：

public class ChatBroadCastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

    }
}  

我送意图在消息中 sendBroadcast（送出数据）和接受它里面 chatFragment 和的onReceive（）方法，我希望看到Toast.But吐司消息没有显示。结果的我有没有实现的BroadcastReceiver正确的内部服务片段??

I am sending the message with intent in sendBroadcast(sendData) and receiving it inside chatFragment and in onReceive() method i want to see the message in Toast.But Toast is not showing.
Did i implement BroadcastReceiver correctly for fragment inside service??

编辑：我调试，看见下面部分并没有叫

I have debugged and saw that below portion is not calling

private final BroadcastReceiver receiver = 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();
    }
};

我必须包括在menifest有关接收任何？

Do I have to include anything in the menifest about the receiver??

推荐答案

在您的片段类使用这段代码：

In your fragment class use this snippet:

1。注册播报：

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getActivity().registerReceiver(this.broadCastNewMessage, new IntentFilter("bcNewMessage"));
        ...
    }

2。声明您播报：

BroadcastReceiver broadCastNewMessage = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
         // here you can update your db with new messages and update the ui (chat message list)
         msgAdapter.notifyDataSetChanged();
         mListView.requestLayout();
         ...
    }
}

3。注销您播报：

@Override
    public void onDestroy() {
        super.onDestroy();
        getActivity().unregisterReceiver(broadCastNewMessage);
    }

然后在你的服务拨打 sendBroadcast（）方式：

this.sendBroadcast(new Intent().setAction("bcNewMessage"));

享受！

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