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