收到Firebase消息后，在RecyclerView适配器中添加列表项 [英] Add list item in RecyclerView Adapter on receiving Firebase message

问题描述

我正在使用Firebase消息传递服务进行消息传递和通知。我似乎无法将来自服务的传入消息传递给适配器，以便在收到消息时将其插入到RecycleView列表中。

我尝试使用BroacastIntent，如下所示：

  public class messaging extends FirebaseMessagingService {
 $ b $ @覆盖
 public void onMessageReceived（RemoteMessage m）{
 store（m.getData（））; 
 broadcastIntent（）; 
 
 
 public void broadcastIntent（）{
 Intent intent = new Intent（）; 
 intent.setAction（com.myApp.CUSTOM_EVENT）; 
 sendBroadcast（intent）; 
 
 
 code 
 
 $ b 
 和Adpter   
 
 
  public class ConvoAdapter extends RecyclerView.Adapter< ConvoHolder> {
 
私人列表< Message>列表; 
私人活动A; 
 
公共ConvoAdapter（列表与LT;消息>数据）{
 
} 
 
 @覆盖
公共ConvoHolder onCreateViewHolder（ViewGroup中父母，INT viewType ）{
 View v = LayoutInflater.from（parent.getContext（））。inflate（layout，parent，false）; 
返回新的ConvoHolder（v）; 
 
 $ b @Override 
 public void onBindViewHolder（ConvoHolder h，int Position）{
 final Message M = list.get（Position）; 
 h.config（A，M）; 
 
 
 @Override 
 public int getItemCount（）{
 return list.size（）; 
 
 $ b public class MyReceiver extends BroadcastReceiver {
 @Override $ b $ public void onReceive（Context context，Intent intent）{
 Toast.makeText（context， Intent Detected，Toast.LENGTH_LONG）.show（）; 
 
 
 
 
 
 
 清单。  
 
 
 < receiver android：name =。fragments.chats.ConvoAdapter $ MyReceiver
 android ：enabled =true
 android：exported =false> 
< intent-filter> 
 < / action> 
< / intent-filter> 
< / receiver> 
  
正因如此，广播接收器没有收到任何消息。  
 
 
我也会使用任何其他方法，不涉及使用广播接收器。  
 
解决方案
您的流程或体系结构不是标准的做法。标准流程应该是 
 
 
 
 Firebase服务   $ b  $ b 
使用 LocalBroadcastManager  
的$  BroadcastReceiver 的某些活动或片段
 
 
 
 
 
 
 
  1。 Firebase服务  
 
 
 公共类消息传递扩展FirebaseMessagingService {
 
 @Override 
 public void onMessageReceived（RemoteMessage m）{
 store（m.getData（））; 
 broadcastIntent（）; 
 
 
 public void broadcastIntent（）{
 Intent intent = new Intent（）; 
 intent.setAction（com.myApp.CUSTOM_EVENT）; 
 //当我们需要INTRA app 
 //通信
时，我们应该使用LocalBroadcastManager LocalBroadcastManager.getInstance（YOUR_CONTEXT）.sendBroadcast（intent）; 
 
 
 $ / code $ / pre 
 
 2 /活动 
 
 $ b 
 
 
 
注册 Receiver  c $ c> Service  
  public void onCreate（Bundle savedInstance）{
 //您代码的剩余部分
 IntentFilter if = new IntentFilter（com.myApp.CUSTOM_EVENT）; 
 LocalBroadcastManager.getInstance（this）.registerReceiver（onMessage，if）; 
 
 $ / code $ $ $ $ $ $ $ $ $ $ $ $接收者$ / code $ c $> $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $' {
 @Override 
 public void onReceive（Context context，Intent intent）{
 //使用notifyItemInserted（position）更新您的RecyclerView。 
 
 $ / code $ / pre 
 $ b $ p 
 $ / ol> 
 
 
 结束： Service 发送本地广播到 code>然后接收它并使用 RecyclerView 实例
 
更新或添加项目
I'm using the firebase messaging service for messaging and notifications. I can't seem to be able to pass an incoming message from the service to the adapter so that when the message is received it can be inserted into the RecycleView List. 

I tried using BroacastIntent as follows : 
public class messaging extends FirebaseMessagingService {

   @Override
   public void onMessageReceived(RemoteMessage m) {
      store(m.getData());
      broadcastIntent();
   }

   public void broadcastIntent() {
      Intent intent = new Intent();
      intent.setAction("com.myApp.CUSTOM_EVENT");
      sendBroadcast(intent);
   }
}
and in the Adpter
public class ConvoAdapter extends RecyclerView.Adapter<ConvoHolder> {

   private List<Message> list;
   private Activity      A;

   public ConvoAdapter(List<Message> data) {

   }

   @Override
   public ConvoHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      View v = LayoutInflater.from(parent.getContext()).inflate(layout, parent, false);
      return new ConvoHolder(v);
   }

   @Override
   public void onBindViewHolder(ConvoHolder h, int Position) {
      final Message M = list.get(Position);
      h.config(A, M);
   }

    @Override
    public int getItemCount() {
       return list.size();
    }

    public class MyReceiver extends BroadcastReceiver {
          @Override
          public void onReceive(Context context, Intent intent) {
             Toast.makeText(context, "Intent Detected.",    Toast.LENGTH_LONG).show();
          }
    }
}
And manifest. 
<receiver android:name=".fragments.chats.ConvoAdapter$MyReceiver"
                  android:enabled="true"
                  android:exported="false" >
            <intent-filter>
                <action android:name="android.intent.action.CUSTOM_EVENT">
                </action>
            </intent-filter>
        </receiver>
As is, the broadcast receiver is not receiving any messages. 

I'd also use any other method that doesn't involve using broadcast receivers. 
解决方案
The flow or architecture of your is not a standard practice. 

The standard flow should be 

Firebase service
Some activity or fragment with BroadcastReceiver using LocalBroadcastManager




1. Firebase Service
public class messaging extends FirebaseMessagingService {

   @Override
   public void onMessageReceived(RemoteMessage m) {
      store(m.getData());
      broadcastIntent();
   }

  public void broadcastIntent() {
      Intent intent = new Intent();
      intent.setAction("com.myApp.CUSTOM_EVENT");
      // We should use LocalBroadcastManager when we want INTRA app
      // communication
      LocalBroadcastManager.getInstance(YOUR_CONTEXT).sendBroadcast(intent);
  }
}
2. Activity

Registering Receiver for broadcast from Service
 public void onCreate(Bundle savedInstance) {
       // REST OF YOUR CODE
       IntentFilter if= new IntentFilter("com.myApp.CUSTOM_EVENT");
       LocalBroadcastManager.getInstance(this).registerReceiver(onMessage, if);
  }

Writing the Receiver in Activity
private BroadcastReceiver onNotice= new BroadcastReceiver() {        
      @Override
      public void onReceive(Context context, Intent intent) {        
             // Update your RecyclerView here using notifyItemInserted(position);
      }
};
Summary: The Service sends local broadcast to Activity which in turn receives it and updates or add items using RecyclerView instance

                        
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