How to schedule notifications using Android WorkManager

In this android programming source code example, we are going to schedule notifications using Android WorkManager.

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 schedule notifications using Android WorkManager.

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=".WorkManagerAndJobSchedule.WorkManagerAndJobScheduleActivity7">

    <Button
        android:id="@+id/schedule"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:text="Schedule Notification"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="19sp"
        android:layout_marginStart="10dp"
        android:layout_marginEnd="10dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;
import androidx.work.OneTimeWorkRequest;
import androidx.work.WorkManager;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import java.util.concurrent.TimeUnit;

public class WorkManagerAndJobScheduleActivity7 extends AppCompatActivity {
    private Button schedule;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_work_manager_and_job_schedule7);
        schedule = (Button) findViewById(R.id.schedule);
        schedule.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startWork();
            }
        });
    }

    private void startWork(){
        OneTimeWorkRequest oneTimeWorkRequest = new OneTimeWorkRequest.Builder(WorkManager7.class).setInitialDelay(10, TimeUnit.SECONDS).build();
        WorkManager.getInstance(this).enqueue(oneTimeWorkRequest);
    }
}

WorkManager7.java

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Build;

import androidx.annotation.NonNull;
import androidx.core.app.NotificationCompat;
import androidx.work.Worker;
import androidx.work.WorkerParameters;


public class WorkManager7 extends Worker {
    public WorkManager7(@NonNull Context context, @NonNull WorkerParameters workerParams) {
        super(context, workerParams);
    }

    @NonNull
    @Override
    public Result doWork() {
        showNotification("Inducesmile", "Hello world, work completed on time");
        return Result.success();
    }

    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());
    }
}

app/build.gradle

implementation 'androidx.work:work-runtime:2.1.0-beta02'

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