Android O - Notification Channels and NotificationCompat

Question

I cannot change this feeling: again, the Android developers came up with something new and leave everybody in the dark about how they would think the feature is used.

I

Answer 1

Its pretty simple to work with NotificationChannnel.

NotificationChannel actually group multiple notifications into channels. It basically gives more control of the notification behavior to the user. You can read more about Notification Channel and its implementation at Working with Notification Channel | With Example

Creating Notification Channel

 // This is the Notification Channel ID. More about this in the next section
public static final String NOTIFICATION_CHANNEL_ID="channel_id";

//User visible Channel Name
public static final String CHANNEL_NAME="Notification Channel";

// Importance applicable to all the notifications in this Channel
int importance=NotificationManager.IMPORTANCE_DEFAULT;

//Notification channel should only be created for devices running Android 26
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

      NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, CHANNEL_NAME, importance);

      //Boolean value to set if lights are enabled for Notifications from this Channel
      notificationChannel.enableLights(true);

      //Boolean value to set if vibration is enabled for Notifications from this Channel
      notificationChannel.enableVibration(true);

      //Sets the color of Notification Light
      notificationChannel.setLightColor(Color.GREEN);

      //Set the vibration pattern for notifications. Pattern is in milliseconds with the format {delay,play,sleep,play,sleep...}
      notificationChannel.setVibrationPattern(new long[]{500,500,500,500,500});

      //Sets whether notifications from these Channel should be visible on Lockscreen or not
      notificationChannel.setLockscreenVisibility( 
 Notification.VISIBILITY_PUBLIC);
}
// Creating the Channel
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.createNotificationChannel(notificationChannel);

Now while creating the Notification just pass the Channel ID to the Notification Builder constructor as shown below

//We pass the unique channel id as the second parameter in the constructor
NotificationCompat.Builder notificationCompatBuilder=new NotificationCompat.Builder(this,NOTIFICATION_CHANNEL_ID);

//Title for your notification
notificationCompatBuilder.setContentTitle("This is title");

//Subtext for your notification
notificationCompatBuilder.setContentText("This is subtext");

//Small Icon for your notificatiom
notificationCompatBuilder.setSmallIcon(R.id.icon);

//Large Icon for your notification 
notificationCompatBuilder.setLargeIcon(  BitmapFactory.decodeResource(getResources(),R.id.icon));

notificationManager.notify( NOTIFICATION_ID,notificationCompatBuilder.build());

WIth this above notification becomes a part of the Notification Channel created in the first step and its behavior will now be with respect to the Channel Settings