InboxStyle Notification

MainActivity.java

import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.NotificationCompat;
import android.view.View;
import android.widget.Button;
import java.util.Calendar;
 public class MainActivity extends AppCompatActivity {
  Button btn;
 @Override 
  protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   btn = (Button) findViewById(R.id.idBtn);
   btn.setOnClickListener(new View.OnClickListener() {
   @Override 
    public void onClick(View v) {
     ClickMe();
   }
  });
 }
 private void ClickMe() {
   //set intents and pending intents to call activity on click of "show activity" action button of notification 
   Intent resultIntent = new Intent(this, MainActivity.class);
   resultIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
    | Intent.FLAG_ACTIVITY_CLEAR_TASK);
   PendingIntent piResult = PendingIntent.getActivity(this, 
   36(int) Calendar.getInstance().getTimeInMillis(), resultIntent, 0);
   //Assign inbox style notification 
   NotificationCompat.InboxStyle inboxStyle = 
    new NotificationCompat.InboxStyle();
   inboxStyle.setBigContentTitle("Inbox Notification");
   inboxStyle.addLine("Message 1.");
   inboxStyle.addLine("Message 2.");
   inboxStyle.addLine("Message 3.");
   inboxStyle.addLine("Message 4.");
   inboxStyle.addLine("Message 5.");
   inboxStyle.setSummaryText("+2 more");
  //build notification 
   NotificationCompat.Builder mBuilder = 
   (NotificationCompat.Builder) new NotificationCompat.Builder(this) 
   .setSmallIcon(R.mipmap.ic_launcher) 
   .setContentTitle("Inbox style notification") 
   .setContentText("This is test of inbox style notification.") 
   .setStyle(inboxStyle) 
   .addAction(R.mipmap.ic_launcher, "show activity", piResult);
   // Gets an instance of the NotificationManager service
   NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
   //to post your notification to the notification bar 
   notificationManager.notify(0, mBuilder.build());
 }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 
<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" 
     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="anu.com.notification.MainActivity"> 
    
    <Button 
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:id="@+id/idBtn" 
     android:background="#FFCC65" 
     android:text="Click" /> 
</RelativeLayout>  ​

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Author : Android Code Tutorial