java - 使用 Firebase 和 Android 的通知

Question

我正在尝试制作一个 android 应用程序，我可以在其中使用 firebase 接收通知。我关注了互联网上可用的资源。

我想要做的就是从 firebase 发送通知，我收到的消息我想在主要 Activity 的 TextView 中显示它。

目前我正在模拟器中进行测试。几乎没有我无法解决的问题。

我可以从 firebase 发送通知，但是:

1. 当应用程序在前台运行时，我没有在 android 通知面板中收到通知，主 Activity 中也没有任何反应。即 TextView 中的文本不会改变。
2. 当应用程序在后台运行时，我确实在 android 通知面板中收到通知，其中包含从 firebase 发送的消息，单击通知主 Activity 将打开，但 TextView 中的文本不会更改。

Firebase 消息服务

public class VAFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "VAFirebaseMessagingS";

    public VAFirebaseMessagingService() {}

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        Log.d(TAG, "From: " + remoteMessage.getFrom());
        if(remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
            sendNotification(remoteMessage.getData().get("text"));
        }

        if(remoteMessage.getNotification() != null) {
            Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
            sendNotification(remoteMessage.getNotification().getBody());
        }
    }

    private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra(Intent.EXTRA_TEXT, messageBody);

        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);
        notificationBuilder.setSmallIcon(R.drawable.ic_stat_name);
        notificationBuilder.setContentTitle("PFIVA");
        notificationBuilder.setContentText(messageBody);
        notificationBuilder.setAutoCancel(true);
        notificationBuilder.setSound(defaultSoundUri);
        notificationBuilder.setContentIntent(pendingIntent);

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

主要 Activity

public class MainActivity extends AppCompatActivity {

    private TextView userFeedbackQuery;

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

        userFeedbackQuery = (TextView) findViewById(R.id.pfiva_user_feedback_query);

        final Intent intent = getIntent();
        if(intent.hasExtra(Intent.EXTRA_TEXT)) {
            String userFeedbackQueryText = intent.getStringExtra(Intent.EXTRA_TEXT);
            userFeedbackQuery.setText(userFeedbackQueryText);
        }
    }
}

Android list

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="de.pfiva.mobile.voiceassistant">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".activities.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name=".messaging.FirebaseInstanceService">
            <intent-filter>
                <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
            </intent-filter>
        </service>

        <service
            android:name=".messaging.VAFirebaseMessagingService"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            </intent-filter>
        </service>

    </application>

</manifest>

请有人指导这里有什么问题吗？我怎样才能解决以上两个问题。

谢谢

---

根据建议，我在消息服务中做了以下更改，基本上添加了通知 channel 。

private void sendNotification(String messageBody) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        intent.putExtra(Intent.EXTRA_TEXT, messageBody);

        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, CHANNEL_ID);
        notificationBuilder.setSmallIcon(R.drawable.ic_stat_name);
        notificationBuilder.setContentTitle("PFIVA");
        notificationBuilder.setContentText(messageBody);
        notificationBuilder.setPriority(NotificationCompat.PRIORITY_HIGH);
        notificationBuilder.setAutoCancel(true);
        notificationBuilder.setSound(defaultSoundUri);
        notificationBuilder.setContentIntent(pendingIntent);

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, importance);
            notificationManager.createNotificationChannel(channel);
        }

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

我现在面临的问题是，当应用程序在后台运行时，我会在通知面板中收到通知并单击它打开主要 Activity ，但 TextView 中的文本未更新。

Answer 1

解决您问题的两个想法:

1. 您是否在 AndroidManifest.xml 中注册了您的 VAFirebaseMessagingService:

2. 从 Android 8 开始，您必须使用通知 channel 来发送推送通知。 Android