使用Android应用程序向FCM发送通知

我想构建客户端和管理员android应用程序，以便管理员应用程序向FCM（API）发送通知，并且客户端应用程序的用户获得此通知

implementation 'com.google.firebase:firebase-messaging:20.1.3'
implementation 'com.google.firebase:firebase-analytics:17.2.3'

因此，我使用Firebase Admin SDK通过使用将通知从Admin应用程序推送到FCM，但在下一段代码（来自文档）中有一些奇怪的地方

---

由于

send（RemoteMessage）

接受

RemoteMessage

而不是

Message

对象，因此我如何修改之前的代码以使用

RemoteMessage

object发送通知

您似乎试图将Firebase Admin SDK与用于Android的Firebase Cloud Messaging SDK混合使用。这是不可能的

任何使用Admin SDK的进程都被授予对Firebase项目的完全、无限制访问权限。因此，如果您将其放在客户端应用程序中，使用该应用程序的每个人都可以向您的任何用户发送FCM消息，但也可以：列出所有用户、删除整个数据库、覆盖云功能等。因此，Firebase Admin SDK应该/只能在受信任的环境中使用，例如您的开发机器，您控制的服务器或云功能

要通过Firebase云消息向设备发送消息，您始终需要一个受信任的环境，通常在FCM文档中称为应用程序服务器

当您在受信任的环境上运行Admin SDK时，可以调用，它将

build（）

返回的

消息作为其参数

另见：


我的博客帖子



这是使用Node.js实现的
使用我的代码像符咒一样工作：
向特定用户发送通知并管理通知的单击

implementation 'com.google.firebase:firebase-messaging:20.1.3'
implementation 'com.google.firebase:firebase-analytics:17.2.3'

显示

    <meta-data
        android:name="com.google.firebase.messaging.default_notification_channel_id"
        android:value="default_channel_id" />

    <service
        android:name=".FCMService" >
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>

发送通知时

  new Thread(new Runnable() {
        @Override
        public void run() {
            pushNotification(senderName + " : " + message);

        }
    }).start();

  private void pushNotification(String message) {
    JSONObject jPayload = new JSONObject();
    JSONObject jNotification = new JSONObject();
    JSONObject jData = new JSONObject();
        try {
            // notification can not put when app is in background
            jNotification.put("title", getString(R.string.app_name));
            jNotification.put("body", message);
            jNotification.put("sound", "default");
            jNotification.put("badge", "1");
            jNotification.put("icon", "ic_notification");

//            jData.put("picture", "https://miro.medium.com/max/1400/1*QyVPcBbT_jENl8TGblk52w.png");

            //to token of any deivce
            jPayload.put("to", device_token);

            // data can put when app is in background
            jData.put("goto_which", "chatactivity");
            jData.put("user_id", mCurrentUserId);

            jPayload.put("priority", "high");
            jPayload.put("notification", jNotification);
            jPayload.put("data", jData);

            URL url = new URL("https://fcm.googleapis.com/fcm/send");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Authorization", "key=" + AUTH_KEY);
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setDoOutput(true);

            // Send FCM message content.
            OutputStream outputStream = conn.getOutputStream();
            outputStream.write(jPayload.toString().getBytes());

            // Read FCM response.
            InputStream inputStream = conn.getInputStream();
            final String resp = convertStreamToString(inputStream);

        } catch (JSONException | IOException e) {
            e.printStackTrace();
        }
    }

    private String convertStreamToString(InputStream is) {
        Scanner s = new Scanner(is).useDelimiter("\\A");
        return s.hasNext() ? s.next().replace(",", ",\n") : "";
    }

添加服务类

    import android.app.NotificationManager;
    import android.app.PendingIntent;
    import android.content.Context;
    import android.content.Intent;
    import android.media.RingtoneManager;
    import android.net.Uri;
    import android.util.Log;

    import androidx.annotation.NonNull;
    import androidx.core.app.NotificationCompat;

    import com.google.android.gms.tasks.OnCompleteListener;
    import com.google.android.gms.tasks.Task;
    import com.google.firebase.iid.FirebaseInstanceId;
    import com.google.firebase.iid.InstanceIdResult;
    import com.google.firebase.messaging.FirebaseMessagingService;
    import com.google.firebase.messaging.RemoteMessage;

    public class FCMService extends FirebaseMessagingService {
        String goto_which, user_id;

        @Override
        public void onMessageReceived(RemoteMessage remoteMessage) {
            super.onMessageReceived(remoteMessage);
            Log.d("ff", "messddda recice: " + remoteMessage.getNotification().getTicker());
            String title = remoteMessage.getNotification().getTitle();
            String body = remoteMessage.getNotification().getBody();

            if (remoteMessage.getData().size() > 0) {
                goto_which = remoteMessage.getData().get("goto_which").toString();
                user_id = remoteMessage.getData().get("user_id").toString();
                Log.d("ff", "messddda send: " + goto_which);
            }
            sendnotification(title, body, goto_which, user_id);
        }

        private void sendnotification(String title, String body, String goto_which, String user_id) {
            Intent intent = new Intent(this, MainActivity.class);
            intent.putExtra("goto_which", goto_which);
            intent.putExtra("user_id", user_id);

            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
            Uri defaultsounduri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            NotificationCompat.Builder nbuilder = new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_launcher_background)
                    .setContentTitle(title)
                    .setContentText(body)
                    .setAutoCancel(true)
                    .setSound(defaultsounduri)
                    .setContentIntent(pendingIntent);

            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.notify(0, nbuilder.build());


            FirebaseInstanceId.getInstance().getInstanceId()
                    .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
                        @Override
                        public void onComplete(@NonNull Task<InstanceIdResult> task) {
                            if (!task.isSuccessful()) {
                                Log.w("f", "getInstanceId failed", task.getException());
                                return;
                            }

                            // Get new Instance ID token
                            String token = task.getResult().getToken();

                        }
                    });

        }
    }

你在标题中提到SVM。这是我不熟悉的首字母缩略词。这是什么意思？您标记了android，但Firebase Admin SDK并不用于客户端应用程序代码（因为它授予运行过程对Firebase项目的无限访问权）。您试图在哪里运行此代码？
    import android.app.NotificationManager;
    import android.app.PendingIntent;
    import android.content.Context;
    import android.content.Intent;
    import android.media.RingtoneManager;
    import android.net.Uri;
    import android.util.Log;

    import androidx.annotation.NonNull;
    import androidx.core.app.NotificationCompat;

    import com.google.android.gms.tasks.OnCompleteListener;
    import com.google.android.gms.tasks.Task;
    import com.google.firebase.iid.FirebaseInstanceId;
    import com.google.firebase.iid.InstanceIdResult;
    import com.google.firebase.messaging.FirebaseMessagingService;
    import com.google.firebase.messaging.RemoteMessage;

    public class FCMService extends FirebaseMessagingService {
        String goto_which, user_id;

        @Override
        public void onMessageReceived(RemoteMessage remoteMessage) {
            super.onMessageReceived(remoteMessage);
            Log.d("ff", "messddda recice: " + remoteMessage.getNotification().getTicker());
            String title = remoteMessage.getNotification().getTitle();
            String body = remoteMessage.getNotification().getBody();

            if (remoteMessage.getData().size() > 0) {
                goto_which = remoteMessage.getData().get("goto_which").toString();
                user_id = remoteMessage.getData().get("user_id").toString();
                Log.d("ff", "messddda send: " + goto_which);
            }
            sendnotification(title, body, goto_which, user_id);
        }

        private void sendnotification(String title, String body, String goto_which, String user_id) {
            Intent intent = new Intent(this, MainActivity.class);
            intent.putExtra("goto_which", goto_which);
            intent.putExtra("user_id", user_id);

            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
            Uri defaultsounduri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            NotificationCompat.Builder nbuilder = new NotificationCompat.Builder(this)
                    .setSmallIcon(R.drawable.ic_launcher_background)
                    .setContentTitle(title)
                    .setContentText(body)
                    .setAutoCancel(true)
                    .setSound(defaultsounduri)
                    .setContentIntent(pendingIntent);

            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notificationManager.notify(0, nbuilder.build());


            FirebaseInstanceId.getInstance().getInstanceId()
                    .addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
                        @Override
                        public void onComplete(@NonNull Task<InstanceIdResult> task) {
                            if (!task.isSuccessful()) {
                                Log.w("f", "getInstanceId failed", task.getException());
                                return;
                            }

                            // Get new Instance ID token
                            String token = task.getResult().getToken();

                        }
                    });

        }
    }

 if (getIntent().getExtras() != null) {
        String goto_which = getIntent().getStringExtra("goto_which");
        String chatUser = getIntent().getStringExtra("user_id");

        if (goto_which.equals("chatactivity")) {
            Intent chatIntent = new Intent(getBaseContext(), ChatActivity.class);
            chatIntent.putExtra("user_id", chatUser);
            startActivity(chatIntent);
        } else if (goto_which.equals("grpchatactivity")) {
            Intent chatIntent = new Intent(getBaseContext(), GroupChatActivity.class);
            chatIntent.putExtra("group_id", chatUser);
            startActivity(chatIntent);
        }
    }