Create Custom Notification in Android.

This demo explains how you can create a Custom Notification in Android old and New versions.

The notification appears expanded in Versions > 16.

Let’s jump into the code…

Below is the MainActivity that creates the notification.

package com.example.android.customnotifications;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;
import android.view.View;
import android.widget.RemoteViews;

import java.text.DateFormat;
import java.util.Date;

public class MainActivity extends Activity {
   
    private void createNotification() {
        // BEGIN_INCLUDE(notificationCompat)
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        // END_INCLUDE(notificationCompat)

        // BEGIN_INCLUDE(intent)
        //Create Intent to launch this Activity again if the notification is clicked.
        Intent i = new Intent(this, MainActivity.class);
        i.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent intent = PendingIntent.getActivity(this, 0, i,
                PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(intent);
        // END_INCLUDE(intent)

        // BEGIN_INCLUDE(ticker)
        // Sets the ticker text
        builder.setTicker(getResources().getString(R.string.custom_notification));

        // Sets the small icon for the ticker
        builder.setSmallIcon(R.drawable.ic_stat_custom);
        // END_INCLUDE(ticker)

        // BEGIN_INCLUDE(buildNotification)
        // Cancel the notification when clicked
        builder.setAutoCancel(true);

        // Build the notification
        Notification notification = builder.build();
        // END_INCLUDE(buildNotification)

        // BEGIN_INCLUDE(customLayout)
        // Inflate the notification layout as RemoteViews
        RemoteViews contentView = new RemoteViews(getPackageName(), R.layout.notification);

        // Set text on a TextView in the RemoteViews programmatically.
        final String time = DateFormat.getTimeInstance().format(new Date()).toString();
        final String text = getResources().getString(R.string.collapsed, time);
        contentView.setTextViewText(R.id.textView, text);

        /* Workaround: Need to set the content view here directly on the notification.
         * NotificationCompatBuilder contains a bug that prevents this from working on platform
         * versions HoneyComb.
         * See https://code.google.com/p/android/issues/detail?id=30495
         */
        notification.contentView = contentView;

        // Add a big content view to the notification if supported.
        // Support for expanded notifications was added in API level 16.
        // (The normal contentView is shown when the notification is collapsed, when expanded the
        // big content view set here is displayed.)
        if (Build.VERSION.SDK_INT >= 16) {
            // Inflate and set the layout for the expanded notification view
            RemoteViews expandedView =
                    new RemoteViews(getPackageName(), R.layout.notification_expanded);
            notification.bigContentView = expandedView;
        }
        // END_INCLUDE(customLayout)

        // START_INCLUDE(notify)
        // Use the NotificationManager to show the notification
        NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        nm.notify(0, notification);
        // END_INCLUDE(notify)
    }

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

    /**
     * Create and show a notification with a custom layout.
     * This callback is defined through the 'onClick' attribute of the
     * 'Show Notification' button in the XML layout.
     *
     * @param v
     */
    public void showNotificationClicked(View v) {
        createNotification();
    }
}

You can download the complete Android Studio Source Code from here..

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