Android provides notification for user information alert. It can toast notification or push notification. A notification is a message you can display to the user outside of your application's normal UI. When you tell the system to issue a notification, it first appears as an icon in the notification area. To see the details of the notification, the user opens the notification drawer. Both the notification area and the notification drawer are system-controlled areas that the user can view at any time.

See toast notification

See the push notification

Here I am creating a sample of push notification. I hope it will be helpful for

android users. Follow below steps to create sample

1.      Create an android project in eclipse or android studio.

2.      Create an activity which show on tap push notification and add this activity on

manifest file 

package com.example.androidnotification; 
import android.app.Activity;
import android.app.NotificationManager;
import android.os.Bundle;

public class MyNotification extends Activity { 
            @Override
            protected void onCreate(Bundle savedInstanceState) {
                        // TODO Auto-generated method stub
                        super.onCreate(savedInstanceState);
                        setContentView(R.layout.notif); 
                        // Remove notification after open this activity 
                NotificationManager notificationManager = (NotificationManager) getSystemService(getApplicationContext().NOTIFICATION_SERVICE); 
                        notificationManager.cancel(MainActivity.notificationID); 
            } 

}

3. Xml layout for My Notification activity

<?
xml
 version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >
 
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text=" Your notification test is successfull !"
        android:textSize="18sp" />
 
</LinearLayout>

4.   Xml layout for Main Activity 

<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" >
 
    <Button
        android:id="@+id/btnNotif"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Pop up Noification" />
 
</RelativeLayout>

5.      Add following code in MainActivity.class 

package com.example.androidnotification;
 
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NotificationCompat;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
 
public class MainActivity extends Activity {
     NotificationManager notificationManager;
     // notification id
     static int notificationID = 100;
     int numMessagesOne = 0;
 
     Button btnMeaasge;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           btnMeaasge = (Button) findViewById(R.id.btnNotif);
           btnMeaasge.setOnClickListener(new OnClickListener() {
 
                @Override
                public void onClick(View v) {
                     // TODO Auto-generated method stub
                     displayMyNotification();
                     // displayNotificationOne();
                }
           });
 
     }
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is // present.
           getMenuInflater().inflate(R.menu.main, menu);
           return true;
     }
 
     // For show notification method
     public void displayMyNotification() {
 NotificationCompat.Builder builder = new NotificationCompat.Builder(
                     getApplicationContext());
 
           // set main title
       builder.setContentTitle("Android Push Notification");
 
           // set notification text
     builder.setContentText("Welcome in Mindstick Developer Section");
 
           // set Sticker for alert message
           builder.setTicker("New Message Alert!");
 
           // set icon
           builder.setSmallIcon(R.drawable.ic_launcher);
 
           // Use default sound for notification
           builder.setDefaults(Notification.DEFAULT_SOUND);
 
           // set number of messages
           builder.setNumber(++numMessagesOne);
 
         notificationManager = (NotificationManager) getSystemService(getApplicationContext().NOTIFICATION_SERVICE);
 
           // A PendingIntent specifies an action to take in the
           // future
PendingIntent myIntent = PendingIntent.getActivity(this, 0, new Intent(
                     this, MyNotification.class), 0);
 
           // on notification click open myIntent
           builder.setContentIntent(myIntent);
 
     /* Update the existing notification using same notification ID */
         notificationManager.notify(notificationID, builder.build());
 
     }
 
}

Now run your application.