Show Notificatiooon Using a Button in Android

Introduction

In this article I will tell you how to 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);

//Create textview

TextView txt=new TextView(this);

//Set text

 txt.setText("You have successfully opened the activity associated with the notification!");

//Set textview on the view

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