应用程序运行时不显示通知。当应用程序关闭时，它可以工作。
MyFirebaseMessagingService.java
public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = MyFirebaseMessagingService.class.getSimpleName();
private NotificationUtils notificationUtils;
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
Log.e(TAG, "From: " + remoteMessage.getFrom());
if (remoteMessage == null)
return;
// Check if message contains a notification payload.
if (remoteMessage.getNotification() != null) {
Log.e(TAG, "Notification Body: " + remoteMessage.getNotification().getBody());
handleNotification(remoteMessage.getNotification().getBody());
}
// Check if message contains a data payload.
if (remoteMessage.getData().size() > 0) {
Log.e(TAG, "Data Payload: " + remoteMessage.getData().toString());
try {
JSONObject json = new JSONObject(remoteMessage.getData().toString());
handleDataMessage(json);
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
}
}
/**
* Called if InstanceID token is updated. This may occur if the security of
* the previous token had been compromised. Note that this is called when the InstanceID token
* is initially generated so this is where you would retrieve the token.
*/
@Override
public void onNewToken(String token) {
Log.d(TAG, "Refreshed token: " + token);
PrefManager.setStringPreferences ( Constants.REGID, token );
// If you want to send messages to this application instance or
// manage this apps subscriptions on the server side, send the
// Instance ID token to your app server.
// sendRegistrationToServer(token);
}
private void handleNotification(String message) {
if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
// app is in foreground, broadcast the push message
Intent pushNotification = new Intent(Config.PUSH_NOTIFICATION);
pushNotification.putExtra("message", message);
LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);
// play notification sound
NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
notificationUtils.playNotificationSound();
}else{
// If the app is in background, firebase itself handles the notification
}
}
private void handleDataMessage(JSONObject json) {
Log.e(TAG, "push json: " + json.toString());
try {
JSONObject data = json.getJSONObject("data");
String title = data.getString("title");
String message = data.getString("message");
boolean isBackground = data.getBoolean("is_background");
String imageUrl = data.getString("image");
String timestamp = data.getString("timestamp");
JSONObject payload = data.getJSONObject("payload");
Log.e(TAG, "title: " + title);
Log.e(TAG, "message: " + message);
Log.e(TAG, "isBackground: " + isBackground);
Log.e(TAG, "payload: " + payload.toString());
Log.e(TAG, "imageUrl: " + imageUrl);
Log.e(TAG, "timestamp: " + timestamp);
if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
// app is in foreground, broadcast the push message
Intent pushNotification = new Intent( Config.PUSH_NOTIFICATION);
pushNotification.putExtra("message", message);
LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);
// play notification sound
NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
notificationUtils.playNotificationSound();
// if (TextUtils.isEmpty(imageUrl)) {
// showNotificationMessage(getApplicationContext(), title, message, timestamp, pushNotification);
// } else {
// // image is present, show notification with image
// showNotificationMessageWithBigImage(getApplicationContext(), title, message, timestamp, pushNotification, imageUrl);
// }
} else {
// app is in background, show the notification in notification tray
Intent resultIntent = new Intent(getApplicationContext(), HomeActivity.class);
resultIntent.putExtra("message", message);
// check for image attachment
if (TextUtils.isEmpty(imageUrl)) {
showNotificationMessage(getApplicationContext(), title, message, timestamp, resultIntent);
} else {
// image is present, show notification with image
showNotificationMessageWithBigImage(getApplicationContext(), title, message, timestamp, resultIntent, imageUrl);
}
}
} catch (JSONException e) {
Log.e(TAG, "Json Exception: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
}
//Showing notification with text only
private void showNotificationMessage(Context context, String title, String message, String timeStamp, Intent intent) {
notificationUtils = new NotificationUtils(context);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
notificationUtils.showNotificationMessage(title, message, timeStamp, intent);
}
//Showing notification with text and image
private void showNotificationMessageWithBigImage(Context context,String title,String message,String timeStamp,Intent intent,String imageUrl) {
notificationUtils = new NotificationUtils(context);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
notificationUtils.showNotificationMessage(title, message, timeStamp, intent, imageUrl);
}
}
handleDataMessage()当应用程序不在后台时，我输入了showNotificationMessage()的代码。但是当我放置showNotificationMessage()功能时，通知不会显示应用程序是后台还是前台。
当我评论该功能通知时，会出现该功能通知，但仅在应用程序在后台时出现。
当应用程序处于前台时如何显示通知？
默认情况下，仅当应用不在前台时，才会显示通知。
如果要在应用程序处于前台时在托盘中显示通知，请添加自定义方法以使用通知兼容显示通知。
并在 onMessageReceived 中调用该方法，例如
if (remoteMessage.getNotification() != null){
Log.d(TAG, "Objects: " + remoteMessage.getNotification());
generateNotification(getApplicationContext(),remoteMessage.getNotification().getBody());
}
这是方法
private void generateNotification(Context context, String msg) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
String channelId = "channel-fbase";
String channelName = "demoFbase";
int importance = NotificationManager.IMPORTANCE_HIGH;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel(
channelId, channelName, importance);
notificationManager.createNotificationChannel(mChannel);
}
Intent notificationIntent = new Intent(getApplicationContext(), AboutActivity.class);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, channelId);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mBuilder.setSmallIcon(R.mipmap.ic_launcher);
int color = 0x008000;
mBuilder.setColor(color);
} else {
mBuilder.setSmallIcon(R.mipmap.ic_launcher);
}
mBuilder.setStyle(new NotificationCompat.BigTextStyle().bigText(msg));
mBuilder.setContentTitle(msg);
mBuilder.setContentText(msg);
mBuilder.setContentIntent(pendingIntent);
//If you don't want all notifications to overwrite add int m to unique value
Random random = new Random();
int m = random.nextInt(9999 - 1000) + 1000;
mNotificationManager.notify(m, mBuilder.build());
}
确保您已在 AndroidManifest 中添加了 Firebase 服务.xml
<service
android:name=".MyFirebaseMessagingService"
android:exported="false">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
</service>
仅使用对象而不是Notification对象发送通知Data。
如果收到处于终止状态的通知，则使用的是通知有效负载对象。在前台，您必须添加显示通知的代码。您必须在通知中写入通知代码：
if (remoteMessage.getNotification() != null) {
Log.e(TAG, "Notification Body: " + remoteMessage.getNotification().getBody());
//Show Notfication
}
有关更多详细信息，请查看官方链接 https://firebase.google.com/docs/cloud-messaging/android/receive
就我而言(android 8.0 及更高版本(，问题是通知被发送到我没有在应用程序中创建的通知通道。通知有效负载类似于以下内容：
const payload = {
"token": deviceToken,
"notification": {
"title": senderFullName,
"body": senderFullName + ": " + message
},
"data": {
"senderId": senderId,
"body": senderFullName + ": " + message,
"type": "chatNotification"
},
"android": {
"collapse_key": "chat_message_notification",
"notification": {
"channel_id": "chat_notifications_channel",
"imageUrl": senderImageUrl
}
}
但是，我的应用程序代码没有创建相应的chat_notifications_channel，一旦创建，一切都很好。
private fun createChatNotificationChannel() {
// 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) {
val name = getString(R.string.direct_messages_notification_channel)
val descriptionText = getString(R.string.chat)
val importance = NotificationManager.IMPORTANCE_DEFAULT
// This is the key line
val channel =
NotificationChannel("chat_notifications_channel", name, importance).apply {
description = descriptionText
}
// Register the channel with the system
val notificationManager: NotificationManager =
getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(channel)
}
}