Notifications in Android

Notifications in Android applications are very useful. This tutorial explains how to set notification in your application with the help of example.

Notification

Notification is to inform or notify about something. Notification in Android apps are very helpful. It gives information about something important. Now a day’s user want ease of use, they don’t want to open apps for new updates again and again. Instead of this, they enable push up notifications. For example no one wants to check his emails again and again in a day, it’s better to tuned on notifications when he receives a new mail. To fulfill this demand of notification this tutorial provides an easy example to set notifications.

NotificationCompat.Builder

NotificationCompat builder class help us to develop notification layout. It has many methods used for notification in application. Here are few of them:

  • addNotification(NotificationCompat.Action action): As the name shows this method is used to add action to notification.
  • addPerson( String uri): This method is used to add person to the notification. For example email from a particular person.
  • getNotification(): Used to get notification.
  • build(): Used to build a notification.
  • setCategory( String category): This method is used to set the category of notification.
  • setColor( int argb): This method is used to set color of notification.
  • setContentTitle( CharSequence title): This method is used to set title of the notification bar.
  • setContentText(CharSequence text): This method is used to set the text shown in notification bar.

Notification Manager

Notification manager is a class used to tell the user that something has happened in the background. It informs about events.




Example of Notifications in Android

Let’s start creating a simple example that shows how to use notifications in your Android app. Open your Android Studio and create main activity. In main activity there is just a text view, an image view and button. When user will click on button it will show notification in status bar. Here is the XML layout of activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="MainActivity">


    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="48dp"
        android:text="Java Tutorial "
        android:textColor="@android:color/holo_red_dark"
        android:textSize="30dp" />

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageButton"
        android:src="@drawable/message"
        android:layout_below="@+id/textView2"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="42dp" />

    <Button
        android:id="@+id/button"
        android:layout_width="150dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/imageButton"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="62dp"
        android:background="@android:color/holo_red_dark"
        android:text="Notification"
        android:onClick="notification"
        android:textColor="@android:color/background_light" />

</RelativeLayout>

Now create another layout for notifications, here is the code for activity_notification_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="400dp"
        android:text="You have a new unread message...." />
</LinearLayout>

Here is the NotificationBar.java

package com.example.admin.androidnotifications;


import android.os.Bundle;
import android.app.Activity;

public class NotificationBar extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_notification_bar);
        
    }
}

Now open your MainActivity.java and paste the following code

package com.example.admin.androidnotifications;

import android.os.Bundle;
import android.app.Activity;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

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

    }

    public void notification(View view)
    {
        addNotification();
    }

    private void addNotification()
    {
        NotificationCompat.Builder builder =
        new NotificationCompat.Builder(this)
                .setSmallIcon(R.drawable.message)
                .setContentTitle("Unread Message")   //this is the title of notification
                .setColor(101)
                .setContentText("You have an unread message.");   //this is the message showed in notification

        Intent intent = new Intent(this, MainActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(contentIntent);

        // Add as notification
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(0, builder.build());
    }
}

Now run your app, here is the output

notification example

notification example

After clicking notification button, a new notification will appear in the status bar. Here is how it looks

new notification

new notification

You can download this project by clicking this link.

 

 

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