Android - Spinner Progress in Notifications

  Thanks to RemoteViews's setViewVisibility, its trivial to show Spinner progress bar in the Notification. Here is an application suggesting new books to download via a background service.

    A good feedback would be to show a progress spinner as the book is being downloaded. Here is the notification layout to achieve the same,

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

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

    android:orientation="horizontal"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <ImageView

        android:id="@+id/preview"

        android:layout_width="128dp"

        android:layout_height="128dp"/>

    <FrameLayout

        android:paddingLeft="40dp"

        android:layout_gravity="center"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content">

    

        <ImageButton

            android:id="@+id/download_button"

            android:background="@android:color/transparent"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:src="@drawable/images2" />

        <ProgressBar

            android:id="@+id/progress_bar"

            android:clickable="false"

            android:visibility="gone"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content" />

    </FrameLayout>

</LinearLayout>

    The ProgressBar's default visibility is set to hidden and is updated only when the intent is fired as the user clicks on the download button.

        Notification.Builder mBuilder = new Notification.Builder(this)

                .setContentTitle("Notification")

                .setContentText("Progress Notification")

                .setSmallIcon(R.drawable.ic_launcher);

    private void updateNotification(boolean showProgress) {

        RemoteViews remoteView = new RemoteViews(getPackageName(), R.layout.service_notification);

        remoteView.setImageViewResource(R.id.preview, R.drawable.gameofthrones);

        if ( showProgress ) {

            remoteView.setViewVisibility(R.id.download_button, View.GONE);

            remoteView.setViewVisibility(R.id.progress_bar, View.VISIBLE);

        } else {

            remoteView.setViewVisibility(R.id.download_button, View.VISIBLE);

            remoteView.setViewVisibility(R.id.progress_bar, View.GONE);

        }

        Notification notification = mBuilder.build();

        notification.contentView = remoteView;

        notification.bigContentView = remoteView;

        NotificationManager manager;

        manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        manager.notify(NOTIFICATION_ID, notification);

    }

    Now as and when the book is being downloaded, the service can update the Notification via updateNotification() and we have a spinner.