Progress Notification in Android Example

In this example we’ll show you how to display progress notification in Android using NotificationManager class. For the sake of simplicity the below example shows an simple AsyncTask that does the background operation and update the progress bar displayed on android notification area.

As described above this example, using an simple layout with an single button. While user clicking on the button the AsyncTask starts and the it displays the progress notification.

Application Layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:text="Start Download" />

</LinearLayout>

Activity Class

import android.app.Activity;
import android.app.NotificationManager;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationCompat.Builder;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
	private NotificationManager mNotifyManager;
	private Builder mBuilder;
	int id = 1;

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

		Button b1 = (Button) findViewById(R.id.button1);
		b1.setOnClickListener(new View.OnClickListener() {

			public void onClick(View arg0) {
				mNotifyManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
				mBuilder = new NotificationCompat.Builder(MainActivity.this);
				mBuilder.setContentTitle("Download")
						.setContentText("Download in progress")
						.setSmallIcon(R.drawable.ic_download);

				new Downloader().execute();
			}
		});
	}

	private class Downloader extends AsyncTask<Void, Integer, Integer> {

		@Override
		protected void onPreExecute() {
			super.onPreExecute();

			// Displays the progress bar for the first time.
			mBuilder.setProgress(100, 0, false);
			mNotifyManager.notify(id, mBuilder.build());
		}

		@Override
		protected void onProgressUpdate(Integer... values) {
			// Update progress
			mBuilder.setProgress(100, values[0], false);
			mNotifyManager.notify(id, mBuilder.build());
			super.onProgressUpdate(values);
		}

		@Override
		protected Integer doInBackground(Void... params) {
			int i;
			for (i = 0; i <= 100; i += 5) {
				// Sets the progress indicator completion percentage
				publishProgress(Math.min(i, 100));
				try {
					// Sleep for 5 seconds
					Thread.sleep(2 * 1000);
				} catch (InterruptedException e) {
					Log.d("TAG", "sleep failure");
				}
			}
			return null;
		}

		@Override
		protected void onPostExecute(Integer result) {
			super.onPostExecute(result);
			mBuilder.setContentText("Download complete");
			// Removes the progress bar
			mBuilder.setProgress(0, 0, false);
			mNotifyManager.notify(id, mBuilder.build());
		}
	}
}