How to start Android WorkManager with BroadcastReceiver

In this android programming source code example, we are going to start Android WorkManager with BroadcastReceiver.

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 start Android WorkManager with BroadcastReceiver.

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.WorkManagerAndJobScheduleActivity4">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_marginStart="10dp"
        android:layout_marginEnd="10dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent">

        <com.google.android.material.textfield.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/time"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Time"
                android:inputType="number"
                android:textColorHint="@color/colorPrimary"
                android:textColor="@color/colorPrimary"/>

            <Button
                android:id="@+id/schedule"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/colorAccent"
                android:text="Start Alarm"
                android:textAllCaps="false"
                android:textColor="#ffffff"
                android:textSize="19sp" />
        </com.google.android.material.textfield.TextInputLayout>
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.google.android.material.textfield.TextInputEditText;

public class WorkManagerAndJobScheduleActivity4 extends AppCompatActivity {
    private TextInputEditText time;
    private Button schedule;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_work_manager_and_job_schedule4);
        time = (TextInputEditText) findViewById(R.id.time);
        schedule = (Button) findViewById(R.id.schedule);
        schedule.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startBroadcast();
           }
        });
    }

    private void startBroadcast(){
        int timeinput = Integer.parseInt(time.getText().toString());
        Intent intent = new Intent(this, BroadcastReceiver4.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 234324243, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+(timeinput * 1000), pendingIntent);
    }
}

BroadcastReceiver4.java

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

import androidx.work.OneTimeWorkRequest;
import androidx.work.WorkManager;

public class BroadcastReceiver4 extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        OneTimeWorkRequest oneTimeWorkRequest = new OneTimeWorkRequest.Builder(WorkManager4.class).build();
        WorkManager.getInstance(context).enqueue(oneTimeWorkRequest);
    }
}

WorkManager4.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 WorkManager4 extends Worker {

    public WorkManager4(@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());
    }
}

AndroidManifest.xml

<receiver android:name=".BroadcastReceiver4">
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
            </intent-filter>
        </receiver>

app/build.gradle

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

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