Firebase 通知在后台工作，但不显示在奥利奥的前台

Question

我正在尝试使用 Firebase 向我的应用发送推送通知。我试过了，它在奥利奥的后台运行良好，但是当我尝试打开应用程序并从另一个帐户发送通知时，通知没有出现。

我该如何解决这个问题，我的代码中的问题在哪里？

这是我服务代码的一部分：

public class FirebaseMessagingService extends 
com.google.firebase.messaging.FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
String messageTitle = remoteMessage.getNotification().getTitle();
String messageBody = remoteMessage.getNotification().getBody();
NotificationCompat.Builder builder = new NotificationCompat.Builder(
this, getString(R.string.default_notification_channel_id))
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentTitle(messageTitle)
.setContentText(messageBody);
Intent resultIntent = new Intent(this, MainAdsActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(
this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);
int id = (int) System.currentTimeMillis();
builder.setContentIntent(pendingIntent);
startForeground(id,builder.build());
NotificationManager notificationManager = 
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(id, builder.build());
}
}

安卓清单文件：

<service
android:name=".FirebaseMessagingService">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT"/>
</intent-filter>
</service>
<meta-data
android:name="com.google.firebase.messaging.default_notification_channel_id"
android:value="@string/default_notification_channel_id"/>

云函数

const functions = require('firebase-functions');
const admin=require('firebase-admin');
admin.initializeApp(functions.config().firebase);
const api = admin.firestore()
api.settings({timestampsInSnapshots: true})
exports.fuync=functions
.firestore.document("Users/{userid}/notification/{notification_id}")
.onWrite((change,context)=>{
const userid=context.params.userid;
const notification_id=context.params.notification_id;
return admin.firestore().collection('Users')


.doc(userid).collection('notification')
.doc(notification_id).get().then(queryRes
ult=>{
const fromuserid=queryResult.data().from;
const frommessage=queryResult.data().message;
const 
fromdata=admin.firestore()
.collection('Users').doc(fromuserid).get();
const todata=admin.firestore()
.collection('Users').doc(userid).get();
return Promise.all([fromdata,todata]).then(result=>{
const fromname=result[0].data().name;
const toname=result[1].data().name;
const tokenid=result[1].data().token_id;
//return console.log("from :" +fromname + "TO: " +toname);
const payload= {
notification: {
title : "notification from" +fromname,
body : frommessage,
icon : "default"
}
};
return admin.messaging().sendToDevice(tokenid,payload).then(result=>{
return console.log("NOTIFICATION SENT.");
});
});
});
});

构建格拉德尔

android {
compileSdkVersion 27
defaultConfig {
applicationId "com.example.amr.app"
minSdkVersion 18
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner 
buildToolsVersion '27.0.3'
}

Answer 1

这是我所做的解决方案，在奥利奥版本和更高版本的前台和后台中完美运行。

创建通知通道非常重要。最重要的是NotificationChannel channel = new NotificationChannel()中的字符串 id . 它必须是Firebase提供的那个default_notification_channel_id：

代码将是这样的：

private static final CharSequence NAME = "amro";
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
//____ID _____
int id = (int) System.currentTimeMillis();
//_____NOTIFICATION ID'S FROM FCF_____
String messageTitle = remoteMessage.getNotification().getTitle();
String messageBody = remoteMessage.getNotification().getBody();
NotificationCompat.Builder builder =
new NotificationCompat
.Builder(this, getString(R.string.default_notification_channel_id))
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentTitle(messageTitle)
.setContentText(messageBody);
//_____REDIRECTING PAGE WHEN NOTIFICATION CLICKS_____
Intent resultIntent = new Intent(this, ProfileActivity.class);
PendingIntent pendingIntent = PendingIntent
.getActivity(this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT
);
builder.setContentIntent(pendingIntent);
if ( Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ) {
int importance = NotificationManager.IMPORTANCE_HIGH;
String channelID = BuildConfig.APPLICATION_ID;
NotificationChannel channel = new NotificationChannel
(getString(R.string.default_notification_channel_id), BuildConfig.APPLICATION_ID, importance);
channel.setDescription(channelID);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
//assert notificationManager != null;
notificationManager.createNotificationChannel(channel);
}

NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
assert notificationManager != null;
notificationManager.notify(id, builder.build());

}

Answer 2

由于安卓奥利奥有频道

当您以 Android 8.0(API 级别 26(为目标平台时，必须实现一个或多个通知渠道。如果您的 targetSdkVersion 设置为 25 或更低版本，则当您的应用在 Android 8.0(API 级别 26(或更高版本上运行时，它的行为与在运行 Android 7.1(API 级别 25(或更低版本的设备上的行为相同。

尝试使用支持库 26 或更高版本并选中此 创建和管理通知通道

尝试使用此方法创建NotificationCompat.Builder

public NotificationCompat.Builder initChannels() {
if (Build.VERSION.SDK_INT < 26) {
return new NotificationCompat.Builder(this);
}
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
String id = BuildConfig.APPLICATION_ID;
NotificationChannel channel = new NotificationChannel(id, BuildConfig.APPLICATION_ID, NotificationManager.IMPORTANCE_HIGH);
channel.setDescription(BuildConfig.APPLICATION_ID);
notificationManager.createNotificationChannel(channel);
return new NotificationCompat.Builder(this, id);
}

从此方法创建新实例

NotificationCompat.Builder builder = initChannels();

Answer 3

String messageTitle = remoteMessage.getNotification().getTitle();
String messageBody = remoteMessage.getNotification().getBody();

尝试

String messageTitle = remoteMessage.getData().getTitle();
String messageBody = remoteMessage.getData().getBody();

Answer 4

首先在 onMessageArrived(( 中添加日志

Log.d("Firebase PM service"， "onMessageArrive'ed"(;

并检查您是否在 LogCat 中获取此日志。

如果您不这样做，则说明Firebase端的某些内容无法正常工作。

如果您收到它，则意味着您在收到推送消息后做错了什么(即未正确显示通知(。还要检查 LogCat 是否抛出任何异常。

然后发布您的重播。

Answer 5

在 FirebaseMessagingService 中使用以下代码。

@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
String messageTitle = remoteMessage.getNotification().getTitle();
String messageBody = remoteMessage.getNotification().getBody();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
CharSequence name = “Your channel name, It will be visible in app setting”;
String description =“Description for your channel”;
int importance = NotificationManager.IMPORTANCE_DEFAULT;
NotificationChannel channel = new NotificationChannel(SOME_CHANNEL_ID, name, importance);
channel.setDescription(description);
NotificationManager notificationManager = getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(channel);
}
NotificationCompat.Builder builder = new NotificationCompat
.Builder(this, getString(R.string.default_notification_channel_id))
.setSmallIcon(R.drawable.ic_launcher_foreground)
.setContentTitle(messageTitle)
.setContentText(messageBody);
Intent resultIntent = new Intent(this, MainAdsActivity.class);
PendingIntent pendingIntent = PendingIntent
.getActivity(this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT
);
int id = (int) System.currentTimeMillis();
builder.setContentIntent(pendingIntent);
startForeground(id,builder.build());
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(id, builder.build());
}
}