How to send a notification from a Service in Android

In this android programming source code example, we are going to send a notification from a Service in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to send a notification from a Service in Android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MapAndService.MapAndServiceActivity19">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent">

        <Button
            android:id="@+id/btnStart"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Start Service"
            android:layout_marginTop="5dp"
            android:background="@color/colorAccent"
            android:textColor="#ffffff"/>

        <Button
            android:id="@+id/btnStop"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="Stop Service"
            android:layout_marginTop="5dp"
            android:background="@color/colorAccent"
            android:textColor="#ffffff"/>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MapAndServiceActivity19 extends AppCompatActivity {
    private Button btnStart;
    private Button btnStop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map_and_service19);
        btnStart = (Button) findViewById(R.id.btnStart);
        btnStop = (Button) findViewById(R.id.btnStop);

        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startService(new Intent(MapAndServiceActivity19.this, Service19.class));
                Toast.makeText(MapAndServiceActivity19.this, "Service Started", Toast.LENGTH_LONG).show();
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopService(new Intent(MapAndServiceActivity19.this, Service19.class));
                Toast.makeText(MapAndServiceActivity19.this, "Service Stoped", Toast.LENGTH_LONG).show();
            }
        });
    }
}

Service19.java

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Build;
import android.os.IBinder;
import android.widget.Toast;

import androidx.core.app.NotificationCompat;

public class Service19 extends Service {
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        showNotification("Inducesmile", "Service started by user.");
        return START_STICKY;
    }

    private void showNotification(String title, String task){
        NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
        if(Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O){
            NotificationChannel notificationChannel = new NotificationChannel("inducesmile", "inducesmile", NotificationManager.IMPORTANCE_DEFAULT);
            notificationManager.createNotificationChannel(notificationChannel);
        }
        NotificationCompat.Builder notification = new NotificationCompat.Builder(getApplicationContext(),"inducesmile")
                .setContentTitle(title)
                .setContentText(task)
                .setSmallIcon(R.mipmap.ic_launcher);
        notificationManager.notify(1, notification.build());
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(this, "Service destroyed by user.", Toast.LENGTH_LONG).show();
    }
}

AndroidManifest.xml

<service android:name=".MapAndService.Service19" />

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