As it is written in Android Documentation:
https://developer.android.com/preview/features/notification-channels.html
If you target Android O and post a notification without specifying a valid notifications channel, the notification fails to post and the system logs an error.
To solve this issue you need to create a NotificationChannel.
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// The id of the channel.
String id = "my_channel_01";
// The user-visible name of the channel.
CharSequence name = getString(R.string.channel_name);
// The user-visible description of the channel.
String description = getString(R.string.channel_description);
int importance = NotificationManager.IMPORTANCE_LOW;
NotificationChannel mChannel = new NotificationChannel(id, name,importance);
// Configure the notification channel.
mChannel.setDescription(description);
mChannel.enableLights(true);
// Sets the notification light color for notifications posted to this
// channel, if the device supports this feature.
mChannel.setLightColor(Color.RED);
mChannel.enableVibration(true);
mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
mNotificationManager.createNotificationChannel(mChannel);
And then assign it to your Notification like this:
mNotificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
// Sets an ID for the notification, so it can be updated.
int notifyID = 1;
// The id of the channel.
String CHANNEL_ID = "my_channel_01";
// Create a notification and set the notification channel.
Notification notification = new Notification.Builder(MainActivity.this)
.setContentTitle("New Message")
.setContentText("You've received new messages.")
.setSmallIcon(R.drawable.ic_notify_status)
.setChannelId(CHANNEL_ID)
.build();
// Issue the notification.
mNotificationManager.notify(id, notification);
Update:
In case you want to use NotificationCompat here is a simple example:
NotificationCompat.Builder mBuilder;
mBuilder = new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.mipmap.ic_launcher_icon)
.setContentTitle("Title")
.setContentText("Text")
.setOngoing(true)
.setChannelId(id);
In fact you have to use Notification Builder in order to set channel id via setChannelId();