How Notification Works in Android?
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.
Notification.Builder creates an Notification object.By Using PendingIntent You can Perform an action which will help you to show notification details.
I am Creating an Example, Which will help you to show notifications. After clicking on Button, Notification will appear,After clicking onNotification-it will show you notifications details.
MainActivity.java
public class MainActivity extends Activity {
private static final int NOTIFY_ME_ID = 1337;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// OnButton Click Notification Will Appear
public void createNotification(View view) {
final NotificationManager mgr = (NotificationManager) this
.getSystemService(Context.NOTIFICATION_SERVICE);
Notification note = new Notification(R.drawable.ic_launcher,
"Your Status Message!!", System.currentTimeMillis());
// This pending intent will open after notification click
PendingIntent i = PendingIntent.getActivity(this, 0, new Intent(this,
NotificationReceiverActivity.class), 0);
note.setLatestEventInfo(this, "Your Notification Title.",
"Your Notification Message.", i);
// After uncomment this line you will see number of notification arrived
// note.number=2;
mgr.notify(NOTIFY_ME_ID, note);
}
}
activity_main.xml
<?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:gravity="center"
android:orientation="vertical" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="createNotification"
android:text="Create Notification" />
</LinearLayout>
NotificationReceiverActivity.java
public class NotificationReceiverActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
}
}
result.xml
<?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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is the result activity opened from the notification" >
</TextView>
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.notifi.tst"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".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:name="NotificationReceiverActivity" />
</application>
</manifest>
Result:
