How to create Service class to run a custom alarm clock in your Android? – Complete source code

In this video it shows the steps to create the Service class for your Android App. It takes the example of implementing an Alarm clock in the service class. For setting the time for the alarm, timepicker widget is used. Please find the source code below.

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package com.example.myserviceclass;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.widget.TimePicker;

public class MainActivity extends AppCompatActivity {

private TimePicker timePicker;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

timePicker = findViewById(R.id.timPicker);

final Intent intent = new Intent(this, MyService.class);
ServiceCaller(intent);

timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker timePicker, int i, int i1) {
ServiceCaller(intent);
}
});

}

private void ServiceCaller(Intent intent){

stopService(intent);

Integer alarmHour = timePicker.getCurrentHour();
Integer alarmMinute = timePicker.getCurrentMinute();

intent.putExtra(“alarmHour”, alarmHour);
intent.putExtra(“alarmMinute”, alarmMinute);

startService(intent);
}
}

package com.example.myserviceclass;

import android.app.Service;
import android.content.Intent;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.os.IBinder;

import androidx.annotation.Nullable;

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;

public class MyService extends Service {

private Integer alarmHour;
private Integer alarmMinute;
private Ringtone ringtone;
private Timer t = new Timer();

@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

alarmHour = intent.getIntExtra(“alarmHour”, 0);
alarmMinute = intent.getIntExtra(“alarmMinute”, 0);

ringtone = RingtoneManager.getRingtone(getApplicationContext(), RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE));

t.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
if (Calendar.getInstance().getTime().getHours() == alarmHour &&
Calendar.getInstance().getTime().getMinutes() == alarmMinute){
ringtone.play();
}
else {
ringtone.stop();
}

}
}, 0, 2000);

return super.onStartCommand(intent, flags, startId);
}

@Override
public void onDestroy() {
ringtone.stop();
t.cancel();
super.onDestroy();
}
}

<?xml version=”1.0″ encoding=”utf-8″?>
<manifest xmlns:android=”http://schemas.android.com/apk/res/android”
package=”com.example.myserviceclass”>

<application
android:allowBackup=”true”
android:icon=”@mipmap/ic_launcher”
android:label=”@string/app_name”
android:roundIcon=”@mipmap/ic_launcher_round”
android:supportsRtl=”true”
android:theme=”@style/AppTheme”>
<service android:name=”.MyService”/>
<activity android:name=”.MainActivity”>
<intent-filter>
<action android:name=”android.intent.action.MAIN” />

<category android:name=”android.intent.category.LAUNCHER” />
</intent-filter>
</activity>
</application>

</manifest

<?xml version=”1.0″ encoding=”utf-8″?>
<RelativeLayout 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=”.MainActivity”>

<TimePicker
android:layout_width=”300dp”
android:layout_height=”wrap_content”
android:id=”@+id/timPicker”
android:layout_centerHorizontal=”true”
android:layout_centerVertical=”true”/>

</RelativeLayout>