Show Notificatiooon Using a Button in Android

Introduction

 

In this article, I will tell you how to produce a notification by the notification manager in Android, but in this article, I will tell you how to generate a notification using a button in Android. To develop this application you can use the following procedure.

 

Step 1

 

As usual, create a new project file as in the following.

 

 

Step 2

 

Open the "activity_main.xml" file and update it as in the following code.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
      android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
  <Button android:id="@+id/notify"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:layout_weight="1"
      android:text=" Show Notification Button"
      android:onClick="triggerNotification"
      />
  <Button android:id="@+id/cancel"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:layout_weight="1"
      android:text="Cancel Notification Button"
      android:onClick="clearNotification"
      />
</LinearLayout>

Step 3

 

Open the "MainActivity.java" file and update it as in the following code.

package com.example.androidsecondapp;
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.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
      //Notification message ID
       private static final int NOTIFY_ME_ID=1337;
      //Counter
       private int count=0;
      //Create NotificationManager  object
       private NotificationManager notifyMgr=null;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
      notifyMgr=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
      }
      public void triggerNotification(View v) {
            //Instantiate notification with icon and ticker message
            Notification notifyObj=new Notification(R.drawable.ic_launcher,"Notification message!",System.currentTimeMillis());
            //PendingIntent to launch our activity if the user selects it
            PendingIntent i=PendingIntent.getActivity(this, 0,
                                        new Intent(this, NotifyActivity.class),0);
            //Set the info that show in the notification panel
            notifyObj.setLatestEventInfo(this, "Notification Created","Click here to see the message", i);
            //Value indicates the current number of events represented by the notification
            notifyObj.number=++count;
            //Set default vibration
            notifyObj.defaults |= Notification.DEFAULT_VIBRATE;
            //Set default notification sound
            notifyObj.defaults |= Notification.DEFAULT_SOUND;
            //Clear the status notification when the user selects it
            notifyObj.flags|=Notification.FLAG_AUTO_CANCEL;
            //Send notification
            notifyMgr.notify(NOTIFY_ME_ID, notifyObj);
              }
      public void clearNotification(View v) {
             //Clear the notification
            notifyMgr.cancel(NOTIFY_ME_ID);
             }

      @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;
      }
}

Step 4

 

Now create a new Java file as "NotifyActivity.java" with the following code:

package com.example.androidsecondapp;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class NotifyActivity extends Activity
{
 @Override
 public void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  TextView txt = new TextView(this);
  txt.setText("You have successfully opened the activity associated with the notification!");
  setContentView(txt);
 }
}

Step 5

 

Open and update the manifest file as "AndroidManifest.xml" using the following code:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidsecondapp"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.androidsecondapp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:label="@string/app_name"
              android:name=".NotifyActivity"></activity>
    </application>
</manifest>

Step 6

 

See the output

 

Notification Button

 

 

Notification Message