Notification android 8 and above

[mmjvox]

I used firebase (java) for remote notifications, when a new notification arrives a java class that extends FirebaseMessagingService class will be called.
Then i separate remote messages like title or etc... and send them to another class that i named GetExtra.
GetExtra is a singletone class:

public class GetExtra {

    NotificationManagerCompat notificationManager;
    NotificationCompat.Builder builder;

    private static final GetExtra singleton = new GetExtra( );
    private GetExtra() { }
    public static GetExtra getInstance( ) {
        return singleton;
    }

    int a=0;

    public void setMessageData(Context ctx, String title, String text, String postid )
    {
        createNotyf(ctx,title,text,postid);
    }

    public void createNotyf(Context ctx, String title, String text, String postid)
    {
        Log.d("nnnnnnnnnnnn: " , title);
        int requestCode= (int) System.currentTimeMillis();
        Intent notificationIntent = new Intent(ctx, GetNotifExtraService.class);
        notificationIntent.putExtra("postid", postid);
        PendingIntent pendingIntent = PendingIntent.getService(ctx, requestCode, notificationIntent,0);

        notificationManager = NotificationManagerCompat.from(ctx);

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(ctx.getPackageName(),"new message!", NotificationManager.IMPORTANCE_DEFAULT);
            NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context. NOTIFICATION_SERVICE );
            notificationManager.createNotificationChannel(channel);

            builder = new NotificationCompat.Builder(ctx ,channel.getId());
        } else {
            builder = new NotificationCompat.Builder(ctx);
        }

        builder.setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle(title)
                .setStyle(new NotificationCompat.BigTextStyle()
                        .bigText(text))
                .setContentIntent(pendingIntent)
                .setAutoCancel(true)
                .setDefaults(Notification.DEFAULT_SOUND)
                .setColor(Color.GREEN)
                .setPriority(NotificationCompat.PRIORITY_MAX);

        notificationManager.notify(a,builder.build());
        a=a+1;
        Log.d("nnnnnnnnnnnn: " , String.valueOf(a));
    }


}

In this class i create a local notification with custom operations from remote messages data.

All things works well in android 7 or older.
But in android 8 or above (although I wrote android 8 and above particular codes and used NotificationChannel) notifications can't made.

I dont faced any warning or error in compile or running logs.

Only this warning is seen when compiling and i don't know if it's relevant:

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

I tested this class in a new android studio project and there isn't any problem in android 8 with android studio builds.

[mmjvox]

I found that. NotificationManagerCompat and NotificationCompat are deprecated.
But i dont know android studio how resolved that.(i used same build tools and target and etc)

The corrected code is as follows:

package my.package.name;

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.Notification;
import android.graphics.BitmapFactory;

public class GetExtra {

    NotificationManager notificationManager;
    Notification.Builder builder;

    private static final GetExtra singleton = new GetExtra( );
    private GetExtra() { }
    public static GetExtra getInstance( ) {
        return singleton;
    }

    int a=0;

    public void createNotification(Context ctx, String title, String text, String postid)
    {
        int requestCode= (int) System.currentTimeMillis();
        Intent notificationIntent = new Intent(ctx, GetNotifExtraService.class);
        notificationIntent.putExtra("postid", postid);
        PendingIntent pendingIntent = PendingIntent.getService(ctx, requestCode, notificationIntent,0);

        notificationManager = (NotificationManager) ctx.getSystemService(Context. NOTIFICATION_SERVICE );

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(ctx.getPackageName(),"new message!", NotificationManager.IMPORTANCE_HIGH);
            notificationManager.createNotificationChannel(channel);

            builder = new Notification.Builder(ctx ,channel.getId());
        } else {
            builder = new Notification.Builder(ctx);
        }

        builder.setSmallIcon(R.drawable.ic_launcher)
               .setLargeIcon(BitmapFactory.decodeResource(ctx.getResources(), R.drawable.ic_launcher))
               .setContentTitle(title)
               .setContentText(text)
               .setDefaults(Notification.DEFAULT_SOUND)
               .setColor(0xFFFAFC77)
               .setContentIntent(pendingIntent)
               .setAutoCancel(true)
               .setPriority(Notification.PRIORITY_MAX);

        notificationManager.notify(a,builder.build());
        a=a+1;
    }

}