Android IntentService < ---- > Activity status callback

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.resultrecevie"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.resultrecevie.MyActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name="com.example.resultrecevie.APIService"/>
    </application>
</manifest>

APIResultReceive.java

package com.example.resultrecevie;

import android.os.Bundle;
import android.os.Handler;
import android.os.ResultReceiver;

public class APIResultReceive extends ResultReceiver {

	private final static String TAG = "APIResultReceive";
	public final static int API_START = 1;
	public final static int API_END = 2;
	public final static int API_SUCCESS = 3;
	public final static int API_FAIL = 4;
	private Receive receive = null;
	
	public interface Receive {
		
		public void onReceiveResult(int resultCode, Bundle resultData);
	}
	
	public APIResultReceive(Handler handler) {
		super(handler);
	}
	
	public void setReceive(Receive receive) {
		this.receive = receive;
	}
	
	@Override
	protected void onReceiveResult(int resultCode, Bundle resultData) {
		super.onReceiveResult(resultCode, resultData);
		if (receive != null) {
			receive.onReceiveResult(resultCode, resultData);
		}
	}
}

APIService.java

package com.example.resultrecevie;

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.os.ResultReceiver;
import android.os.SystemClock;
import android.util.Log;

public class APIService extends IntentService {
	
	private final static String TAG = "APIService";
	public final static String EXTRA_COUNT = "extra_count";
	public final static String EXTRA_RECEIVE = "extra_receive";
	
	public APIService() {
		super(TAG);
	}

	@Override
	protected void onHandleIntent(Intent intent) {
		sendData(
			intent.getIntExtra(EXTRA_COUNT, 0),
			(ResultReceiver) intent.getParcelableExtra(EXTRA_RECEIVE)
		);
	}
	
	private void sendData(int count, ResultReceiver resultReceive) {
		resultReceive.send(APIResultReceive.API_START, null);
		
		for (int i = 0; i < count; i++) {
			Log.i(TAG, "i = " + i);
			SystemClock.sleep(1000);
		}
		
		resultReceive.send(APIResultReceive.API_END, null);
	}
	
	public static void sendData(Context context, int count, APIResultReceive resultReceive) {
		Intent intent = new Intent(context, APIService.class);
		intent.putExtra(EXTRA_COUNT, count);
		intent.putExtra(EXTRA_RECEIVE, resultReceive);
		context.startService(intent);
	}
}

MyActivity.java

package com.example.resultrecevie;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;

public class MyActivity extends Activity implements APIResultReceive.Receive {

	private final static String TAG = "MyActivity";
	private APIResultReceive resultReceive = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.i(TAG, "onCreate");
		
		resultReceive = new APIResultReceive(new Handler());
		resultReceive.setReceive(this);
		
		//	start send data
		APIService.sendData(this, 10, resultReceive);
	}
	
	@Override
	protected void onResume() {
		super.onResume();
		Log.i(TAG, "onResume");
	}
	
	@Override
	protected void onDestroy() {
		super.onDestroy();
		Log.i(TAG, "onDestory");
		resultReceive.setReceive(null);
	}

	@Override
	public void onReceiveResult(int resultCode, Bundle resultData) {
		switch (resultCode) {
			case APIResultReceive.API_START:
				Log.d(TAG, "APIResultReceive.API_START");
				break;
			case APIResultReceive.API_SUCCESS:
				Log.d(TAG, "APIResultReceive.API_SUCCESS");
				break;
			case APIResultReceive.API_FAIL:
				Log.d(TAG, "APIResultReceive.API_FAIL");
				break;
			case APIResultReceive.API_END:
				Log.d(TAG, "APIResultReceive.API_END");
				break;
		}
	}
}