On Android 8.1 API 27 notification does not display
I get Toast on Android 8.1 API 27:
Developer warning for package "my_package_name"
Failed to post notification on ...
Logcat includes next strings:
Notification: Use of stream types is deprecated for operations other than volume control
W/Notification: See the documentation of setSound() for what to use instead with android.media.AudioAttributes to qualify your playback use case
E/NotificationService: No Channel found for pkg=my_package_name
The full information in the Toast and in Logcat can help in the localization this problem.
Solution 1:
If you get this error should be paid attention to 2 items and them order:
NotificationChannel mChannel = new NotificationChannel(id, name, importance);
builder = new NotificationCompat.Builder(context, id);
Also NotificationManager notifManager and NotificationChannel mChannel are created only once.
There are required setters for Notification:
- builder.setContentTitle() // required
- .setSmallIcon() // required
- .setContentText() // required
See example:
private NotificationManager notifManager;
public void createNotification(String aMessage, Context context) {
final int NOTIFY_ID = 0; // ID of notification
String id = context.getString(R.string.default_notification_channel_id); // default_channel_id
String title = context.getString(R.string.default_notification_channel_title); // Default Channel
Intent intent;
PendingIntent pendingIntent;
NotificationCompat.Builder builder;
if (notifManager == null) {
notifManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel mChannel = notifManager.getNotificationChannel(id);
if (mChannel == null) {
mChannel = new NotificationChannel(id, title, importance);
mChannel.enableVibration(true);
mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
notifManager.createNotificationChannel(mChannel);
}
builder = new NotificationCompat.Builder(context, id);
intent = new Intent(context, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
builder.setContentTitle(aMessage) // required
.setSmallIcon(android.R.drawable.ic_popup_reminder) // required
.setContentText(context.getString(R.string.app_name)) // required
.setDefaults(Notification.DEFAULT_ALL)
.setAutoCancel(true)
.setContentIntent(pendingIntent)
.setTicker(aMessage)
.setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
}
else {
builder = new NotificationCompat.Builder(context, id);
intent = new Intent(context, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
builder.setContentTitle(aMessage) // required
.setSmallIcon(android.R.drawable.ic_popup_reminder) // required
.setContentText(context.getString(R.string.app_name)) // required
.setDefaults(Notification.DEFAULT_ALL)
.setAutoCancel(true)
.setContentIntent(pendingIntent)
.setTicker(aMessage)
.setVibrate(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400})
.setPriority(Notification.PRIORITY_HIGH);
}
Notification notification = builder.build();
notifManager.notify(NOTIFY_ID, notification);
}
Solution 2:
Andy's answer is working however I wanted to avoid to deprecated Builder and follow the FireBase Quickstart Project. I just added code before notify from manager.
String channelId = "default_channel_id";
String channelDescription = "Default Channel";
// Since android Oreo notification channel is needed.
//Check if notification channel exists and if not create one
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel notificationChannel = notificationManager.getNotificationChannel(channelId);
if (notificationChannel == null) {
int importance = NotificationManager.IMPORTANCE_HIGH; //Set the importance level
notificationChannel = new NotificationChannel(channelId, channelDescription, importance);
notificationChannel.setLightColor(Color.GREEN); //Set if it is necesssary
notificationChannel.enableVibration(true); //Set if it is necesssary
notificationManager.createNotificationChannel(notificationChannel);
}
}
//notificationManager.notify as usual
Edit: They removed the channel exist check from example I am not sure why.
Solution 3:
I have set channel id, but notification still not shown.
Finally i found my problem is had not invoke "setContentText()" method.
It was really help me that @Andy Sander mentioned "required setters"!
here are required setters for Notification on Android 8 Oreo API 26 and later:
builder.setContentTitle() // required
.setSmallIcon() // required
.setContentText() // required
.setChannelId(id) // required for deprecated in API level >= 26 constructor .Builder(this)