How to schedule a work on a specific time using Android WorkManager

In this android programming source code example, we are going to schedule a work on a specific time 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 a work on a specific time 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.WorkManagerAndJobScheduleActivity3">

    <Button
        android:id="@+id/schedule"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:text="Schedule Work"
        android:textAllCaps="false"
        android:textColor="#ffffff"
        android:textSize="19sp"
        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.Constraints;
import androidx.work.NetworkType;
import androidx.work.PeriodicWorkRequest;
import androidx.work.WorkManager;

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

import java.util.concurrent.TimeUnit;

public class WorkManagerAndJobScheduleActivity3 extends AppCompatActivity {
    private Button schedule;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_work_manager_and_job_schedule3);
        schedule = (Button) findViewById(R.id.schedule);
        schedule.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startWork();
            }
        });
    }

    private void startWork(){
        Constraints constraints = new Constraints.Builder()
                .setRequiresBatteryNotLow(true)
                .setRequiresCharging(true)
                .setRequiredNetworkType(NetworkType.CONNECTED)
                .build();
        PeriodicWorkRequest periodicWorkRequest = new PeriodicWorkRequest.Builder(WorkManager3.class, 16, TimeUnit.MINUTES)
                .setInitialDelay(10, TimeUnit.SECONDS)
                .setConstraints(constraints).build();
        WorkManager.getInstance(this).enqueue(periodicWorkRequest);

    }
}

WorkManager3.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 WorkManager3 extends Worker {

    public WorkManager3(@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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