通过api在后台运行时显示Firebase消息的通知onReceived [英] Show Notification of Firebase Message onReceived when App is in Background Through api

问题描述

我已经构建了一个聊天应用程序.运行正常.两个用户都可以轻松聊天 但是我感到困惑的是，如果某个用户的应用程序处于后台并且屏幕关闭，则无法通知用户该收到的消息.

I have built a chat application . It is working fine . both users can chat easily but where I get Stuck is if one user's app is at background and screen is off , user is unable to be notified of that received message.

我现在要在应用程序中执行的操作是当userA向userB发送消息，并且userB移动设备处于空闲状态，但是应用程序在后台运行时，userB可以获取有关该消息的通知.和userB可以打开聊天活动并阅读消息.

What I want now is in my application is when userA sends message to userB , and userB mobile is idle but application is running in background, userB can get notification about that message. and userB can open the chat activity and read the message .

我的firebase通知正在firebase控制台上运行，但是当应用程序屏幕关闭且应用程序在运行时，我不知道如何调用实例ID并将其从api发送到特定设备，并且特定用户会收到有关接收到的消息的通知.背景状态.我应该如何实现?

My firebase notification is working from firebase console but I don't know how to call instance id and send that to particular device from api and particular user get notification about the received message , when application screen is off and application is running in background state . How should I achieve it?

我在这里有我的Firebase实例ID服务类:

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
    private static final String TAG = "MyFirebaseIIDService";

    @Override
    public void onTokenRefresh() {

        //Getting registration token
        String refreshedToken = FirebaseInstanceId.getInstance().getToken();

        //Displaying token on logcat
        Log.d(TAG, "Refreshed token: " + refreshedToken);
    }

    private void sendRegistrationToServer(String token) {
        //You can implement this method to store the token on your server
        //Not required for current project
    }
}

这是我的MyFirebase消息服务类

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if (remoteMessage.getNotification().getBody() != null) {
            Log.e("FIREBASE", "Message Notification Body: " + remoteMessage.getNotification().getBody());
            sendNotification(remoteMessage);
        }
    }

    private void sendNotification(RemoteMessage remoteMessage) {
        RemoteMessage.Notification notification = remoteMessage.getNotification();
        Intent intent = new Intent(this, LoggedInView.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.first_aid))
                .setSmallIcon(R.drawable.first_aid)
                .setContentTitle(notification.getTitle())
                .setContentText(notification.getBody())
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

        NotificationManager notificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0, notificationBuilder.build());
    }
}

这是我的聊天活动:

public class Chat extends AppCompatActivity {
    LinearLayout layout;
    ImageView sendButton,vidcall;
    EditText messageArea;
    ScrollView scrollView;
    Firebase reference1, reference2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.act_chat);

        layout = (LinearLayout)findViewById(R.id.layout1);
        sendButton = (ImageView)findViewById(R.id.sendButton);
        vidcall = (ImageView)findViewById(R.id.vidBtnk);
        messageArea = (EditText)findViewById(R.id.messageArea);
        scrollView = (ScrollView)findViewById(R.id.scrollView);

        Firebase.setAndroidContext(this);
        reference1 = new Firebase("https://*******.firebaseio.com/messages/" + UserDetails.username + "_" + UserDetails.chatWith);
        reference2 = new Firebase("https://*******.firebaseio.com/messages/" + UserDetails.chatWith + "_" + UserDetails.username);

        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String messageText = messageArea.getText().toString();

                if(!messageText.equals("")){
                    Map<String, String> map = new HashMap<String, String>();
                    map.put("message", messageText);
                    map.put("user", UserDetails.username);
                    reference1.push().setValue(map);
                    reference2.push().setValue(map);
                }
                messageArea.setText("");
            }
        });

        vidcall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                startActivity(new Intent(Chat.this, ConnectActivity.class));



            }
        });

        reference1.addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                Map map = dataSnapshot.getValue(Map.class);
                String message = map.get("message").toString();
                String userName = map.get("user").toString();

                if(userName.equals(UserDetails.username)){
                    addMessageBox("You:-\n" + message, 1);
                }
                else{
                    addMessageBox(UserDetails.chatWith + ":-\n" + message, 2);
                }
            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {

            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(FirebaseError firebaseError) {

            }
        });
    }


   // boolean doubleBackToExitPressedOnce = false;

    @Override
    public void onBackPressed() {

        AlertDialog.Builder builder1 = new AlertDialog.Builder(Chat.this);
        builder1.setMessage("CAUTION! -> Do Wish to End this Session");
        builder1.setCancelable(true);
        builder1.setPositiveButton(
                "Yes",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {

                        finish();

                        dialog.cancel();
                    }
                });

        builder1.setNegativeButton(
                "No",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });

        AlertDialog alert11 = builder1.create();
        alert11.show();


    }


    public void addMessageBox(String message, int type){
        TextView textView = new TextView(Chat.this);
        textView.setText(message);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        lp.setMargins(0, 0, 0, 10);
        textView.setLayoutParams(lp);

        if(type == 1) {
            textView.setBackgroundResource(R.drawable.rounded_corner1);
        }
        else{
            textView.setBackgroundResource(R.drawable.rounded_corner2);
        }

        layout.addView(textView);
        scrollView.fullScroll(View.FOCUS_DOWN);
    }
}

推荐答案

我解决了这个问题，可能对某人有帮助，

I solved this problem may it help someone ,

要通过api将Firebase的通知发送到单个设备，如下所示:

In order to send Notification of firebase through api to single device is as follows:

1:为每个设备生成唯一的实例ID

public class MyFirebaseInstanceIDService extends FirebaseInstanceIdService {
private static final String TAG = "MyFirebaseIIDService";

@Override
public void onTokenRefresh() {

    //Getting registration token
    String refreshedToken = FirebaseInstanceId.getInstance().getToken();

    //Displaying token on logcat
    Log.d(TAG, "Refreshed token: " + refreshedToken);

    sendRegistrationToServer(refreshedToken);

}

private void sendRegistrationToServer(String token) {
    //You can implement this method to store the token on your server
    //Not required for current project




}

}

注意:您可以从应用程序中的任何位置调用实例ID，如下所示:

Note: you can call Instance Id from any where in your Application Like this:

String tkn = FirebaseInstanceId.getInstance().getToken();
        Toast.makeText(Doc_users.this, "Current token ["+tkn+"]",
                Toast.LENGTH_LONG).show();
        Log.d("App", "Token ["+tkn+"]");

此令牌必须用于将通知发送到单个设备，它是您可以将其存储在Firebase数据库中的设备的ID

this token must be used to send notification to single device it is the id of the device you can store it in your firebase database

 reference.child(UserDetails.username).child("token").setValue(tokun);

2:现在，您可以构建逻辑来获取这些ID并构建您的请求

public static String makeRequest(String id) throws JSONException {
        HttpURLConnection urlConnection;
        JSONObject json = new JSONObject();
        JSONObject info = new JSONObject();
        info.put("title", "Notification Title");   // Notification title
        info.put("body", "Notification body"); // Notification body
        info.put("sound", "mySound"); // Notification sound
        json.put("notification", info);
        json.put("to","INSTANCE ID FETCHED FOR SIGNLE DEVICE HERE");
        Log.e("deviceidkey==> ",id+"");
        Log.e("jsonn==> ",json.toString());
        String data = json.toString();
        String result = null;
        try {
            //Connect
            urlConnection = (HttpURLConnection) ((new URL("https://fcm.googleapis.com/fcm/send").openConnection()));
            urlConnection.setDoOutput(true);
            urlConnection.setRequestProperty("Content-Type", "application/json");
            urlConnection.setRequestProperty("Authorization", "key=YOUR FIREBASE SERVER KEY");
            urlConnection.setRequestMethod("POST");
            urlConnection.connect();

            //Write
            OutputStream outputStream = urlConnection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
            writer.write(data);
            writer.close();
            outputStream.close();

            //Read
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream(), "UTF-8"));

            String line = null;
            StringBuilder sb = new StringBuilder();

            while ((line = bufferedReader.readLine()) != null) {
                sb.append(line);
            }

            bufferedReader.close();
            result = sb.toString();

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

通知会在从您的设备发送的那一台设备上生成，您可以调试以放置自己的设备密钥并使用邮递员进行有效的请求:祝您好运

Notification will generate on that single device sent from your device you can debug to put your own device key and use postman for valid request: Good Luck

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