how to create a Big Picture notification in android studio from resource drawable

how to create a Big Picture notification in android studio. Big picture notification is mostly used notification when we have image that needed to show to user with notification

Collapse view of big picture notification 

Big Picture notification

step :1 create a App class and create an notification channels

public class App extends Application {

    public static final String CHANNEL_ID = "channel1";

    @Override

    public void onCreate() {

        super.onCreate();

        creatnotificationchannel();

    }

    private void creatnotificationchannel() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

            CharSequence name = "personal notification";

            String description = "personal informaton all are here";

            int importance = NotificationManager.IMPORTANCE_DEFAULT;

            NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, name, importance);

            notificationChannel.setDescription(description);

            NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

            notificationManager.createNotificationChannel(notificationChannel);

        }

    }

}

step :2 add app class into menifest.xml file

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.notifiaction">

    <application

        android:name=".App" // This is app class 

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        </application>

</manifest>

step 3: in big picture notification you need to get bitmap of that image and then set into notification . here we are using a resource drawable then convert into bitmap

  public void N6_bigpicturenotification(View view) {

    

        Bitmap picture = BitmapFactory.decodeResource(getResources(), R.drawable.image2);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID);

        builder.setContentTitle("this is title of message");

        builder.setSmallIcon(R.drawable.ic_notifications_active_black_24dp);

        builder.setContentText("This is content text of notification");

        builder.setLargeIcon(picture);

        builder.setOngoing(false); // if you are using true this notification cancelable by swipe this is always showing 

        builder.setStyle(new        NotificationCompat.BigPictureStyle().bigPicture(picture).bigLargeIcon(null));

        builder.setPriority(NotificationCompat.PRIORITY_HIGH);

        builder.setAutoCancel(true);

        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(this);

        notificationManagerCompat.notify(1, builder.build());

    }

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