Sample notification implementation (Android Activity)

SampleNotificationActivity.java

import android.app.Notification;
import android.app.PendingIntent;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.media.RingtoneManager;
import android.support.v4.app.NotificationManagerCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.NotificationCompat;
import android.view.View;
import android.widget.Button;

public class SampleNotificationActivity extends AppCompatActivity {

    Button bttn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, SampleNotificationActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
        bttn = (Button) findViewById(R.id.bttn);

        bttn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                NotificationCompat.Builder notificationBuilder = (NotificationCompat.Builder) new NotificationCompat.Builder(SampleNotificationActivity.this)
                        .setSmallIcon(android.R.drawable.stat_notify_error)
                        .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                        .setContentTitle("This is the notification title")
                        .setContentText("This is the notification content")
                        .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
                        .setContentIntent(pendingIntent);
                notificationBuilder.setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE);
                NotificationManagerCompat notificationManager = NotificationManagerCompat.from(SampleNotificationActivity.this);
                notificationManager.notify(1, notificationBuilder.build());
            }
        });
    }
}