<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.jssec.android.service.publicservice">
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:allowBackup="false">
        <!-- Most standard Service -->
        <!-- *** POINT 1 *** Explicitly set the exported attribute to true. -->
        <service android:name=".PublicStartService" android:exported="true">
            <intent-filter>
                <action android:name="org.jssec.android.service.publicservice.action.startservice" />
            </intent-filter>
        </service>
        <!-- Public Service derived from IntentService class -->
        <!-- *** POINT 1 *** Explicitly set the exported attribute to true. -->
        <service android:name=".PublicIntentService" android:exported="true">
            <intent-filter>
                <action android:name="org.jssec.android.service.publicservice.action.intentservice" />
            </intent-filter>
        </service>
    </application>
</manifest>

package org.jssec.android.service.publicservice;

import android.app.IntentService;
import android.content.Intent;
import android.widget.Toast;

public class PublicIntentService extends IntentService {

    /**
    * Default constructor must be provided when a service extends IntentService class.
    * If it does not exist, an error occurs.
    */
    public PublicIntentService() {
        super("CreatingTypeBService");
    }

    // The onCreate gets called only one time when the Service starts.
    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(this, this.getClass().getSimpleName() + " - onCreate()", Toast.LENGTH_SHORT).show();
    }

    // The onHandleIntent gets called each time after the startService gets called.
    @Override
    protected void onHandleIntent(Intent intent) {
        // *** POINT 2 *** Handle intent carefully and securely.
        // Since it's public service, the intent may come from malicious application.
        // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."
        String param = intent.getStringExtra("PARAM");
        Toast.makeText(this, String.format("Recieved parameter ¥"%s¥"", param), Toast.LENGTH_LONG).show();
    }

    // The onDestroy gets called only one time when the service stops.
    @Override
    public void onDestroy() {
        Toast.makeText(this, this.getClass().getSimpleName() + " - onDestroy()", Toast.LENGTH_SHORT).show();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.jssec.android.service.publicserviceuser">
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:allowBackup="false">
        <activity
            android:name=".PublicUserActivity"
            android:label="@string/app_name"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

package org.jssec.android.service.publicserviceuser;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class PublicUserActivity extends Activity {

    // Using Service Info
    private static final String TARGET_PACKAGE =