Service (4) - bindService

bindService 구현

하단 예제 코드는 단일 process 는 물론 다른 process(package) 와 양방향 통신도 가능하다.

  

1. Service 구현

	public class PhService extends Service
	{
	public interface MessengerMsg {
	int CONNECT = 1;
	int DISCONNECT = 2;
	int GET_TIMESTAMP = 3;
	int MUSIC_PLAY = 4;
	int MUSIC_STOP = 5;
	}
	// Activity 와 통신할 messenger
	private final Messenger mServiceMessenger = new Messenger(new ServiceHandler());
	private Messenger mActivityMessenger;
	private MediaPlayer mMediaPlayer;
	private long mStartTime;
	private class ServiceHandler extends Handler {
	@Override
	public void handleMessage(Message a_msg) {
	Message replyMsg;
	switch (a_msg.what) {
	case MessengerMsg.CONNECT:
	mActivityMessenger = a_msg.replyTo;
	replyMsg = Message.obtain(null, MessengerMsg.CONNECT);
	try {
	mActivityMessenger.send(replyMsg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	break;
	case MessengerMsg.DISCONNECT:
	mActivityMessenger = null;
	break;
	case MessengerMsg.GET_TIMESTAMP:
	Bundle bundle = new Bundle();
	bundle.putLong("parkho", getTime());
	replyMsg = Message.obtain(null, MessengerMsg.GET_TIMESTAMP);
	replyMsg.setData(bundle);
	try {
	mActivityMessenger.send(replyMsg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	// 1초에 한 번씩 time 확인
	sendEmptyMessageDelayed(MessengerMsg.GET_TIMESTAMP, 1000);
	break;
	case MessengerMsg.MUSIC_PLAY:
	onStartMusic();
	break;
	case MessengerMsg.MUSIC_STOP:
	onStopMusic();
	removeCallbacksAndMessages(null);
	break;
	default:
	super.handleMessage(a_msg);
	}
	}
	}
	@Override
	public void onDestroy() {
	super.onDestroy();
	mStartTime = 0;
	if (mMediaPlayer != null) {
	mMediaPlayer.stop();
	}
	}
	@Override
	public IBinder onBind(Intent intent) {
	return mServiceMessenger.getBinder();
	}
	@Override
	public boolean onUnbind(Intent intent) {
	return true;
	}
	private void onStartMusic() {
	mStartTime = SystemClock.elapsedRealtime();
	mMediaPlayer = MediaPlayer.create(this, R.raw.sample);
	mMediaPlayer.setLooping(false);
	mMediaPlayer.start();
	}
	private void onStopMusic() {
	mMediaPlayer.stop();
	mMediaPlayer.seekTo(0);
	}
	private long getTime() {
	return SystemClock.elapsedRealtime() - mStartTime;
	}
	}

view raw PhService.java hosted with ❤ by GitHub

 

2. Manifest 등록

	<?xml version="1.0" encoding="utf-8"?>
	<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="com.parkho.servicesample">
	<application
	android:icon="@mipmap/ic_launcher"
	android:label="@string/app_name"
	android:theme="@style/AppTheme">
	<activity android:name=".PhMainActivity">
	<intent-filter>
	<action android:name="android.intent.action.MAIN" />
	<category android:name="android.intent.category.LAUNCHER" />
	</intent-filter>
	</activity>
	<service
	android:name=".PhService"
	android:process=":newprocess" />
	</application>
	</manifest>

view raw AndroidManifest.xml hosted with ❤ by GitHub

 

3. Layout 생성

	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:orientation="vertical">
	<Button
	android:id="@+id/btn_start"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_margin="24.00dp"
	android:text="@string/start_music" />
	<Button
	android:id="@+id/btn_stop"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_margin="24.00dp"
	android:text="@string/stop_music" />
	<TextView
	android:id="@+id/tv_time"
	android:layout_width="match_parent"
	android:layout_height="wrap_content"
	android:layout_margin="24.00dp"
	android:gravity="center"
	android:text="@string/default_time_value" />
	</LinearLayout>

view raw layout.xml hosted with ❤ by GitHub

 

4. MainActivity

	public class PhMainActivity extends AppCompatActivity
	{
	// Service 와 통신할 messenger
	final Messenger mActivityMessenger = new Messenger(new ActivityHandler());
	private Messenger mBoundServiceMessenger;
	private TextView mTvTime;
	private class ActivityHandler extends Handler {
	@Override
	public void handleMessage(Message a_msg) {
	switch (a_msg.what) {
	case MessengerMsg.CONNECT:
	Snackbar.make(findViewById(android.R.id.content), R.string.service_connected, Snackbar.LENGTH_LONG).show();
	break;
	case MessengerMsg.GET_TIMESTAMP:
	String strTime = convertTimeFormat(a_msg.getData().getLong("parkho"));
	mTvTime.setText(strTime);
	break;
	default:
	super.handleMessage(a_msg);
	}
	}
	}
	// https://www.truiton.com/2015/01/android-bind-service-using-messenger/
	private ServiceConnection mServiceConnection = new ServiceConnection() {
	public void onServiceConnected(ComponentName a_name, IBinder a_service) {
	mBoundServiceMessenger = new Messenger(a_service);
	Message msg = Message.obtain(null, MessengerMsg.CONNECT);
	msg.replyTo = mActivityMessenger;
	try {
	mBoundServiceMessenger.send(msg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	}
	public void onServiceDisconnected(ComponentName a_name) {
	mBoundServiceMessenger = null;
	}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	Button btnStart = findViewById(R.id.btn_start);
	btnStart.setOnClickListener(new OnClickListener() {
	public void onClick(View a_view) {
	Message msg = Message.obtain(null, MessengerMsg.MUSIC_PLAY);
	try {
	mBoundServiceMessenger.send(msg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	msg = Message.obtain(null, MessengerMsg.GET_TIMESTAMP);
	try {
	mBoundServiceMessenger.send(msg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	}
	});
	Button btnStop = findViewById(R.id.btn_stop);
	btnStop.setOnClickListener(new OnClickListener() {
	public void onClick(View a_view) {
	Message msg = Message.obtain(null, MessengerMsg.MUSIC_STOP);
	try {
	mBoundServiceMessenger.send(msg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	}
	});
	mTvTime = findViewById(R.id.tv_time);
	}
	@Override
	protected void onStart() {
	super.onStart();
	// 서비스 시작
	Intent intent = new Intent(this, PhService.class);
	bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);
	}
	@Override
	protected void onStop() {
	super.onStop();
	Message msg = Message.obtain(null, MessengerMsg.DISCONNECT);
	try {
	mBoundServiceMessenger.send(msg);
	} catch (RemoteException e) {
	e.printStackTrace();
	}
	if (mBoundServiceMessenger != null) {
	unbindService(mServiceConnection);
	mBoundServiceMessenger = null;
	}
	}
	/**
	* Time format
	*/
	private String convertTimeFormat(final long a_time) {
	final long hr = TimeUnit.MILLISECONDS.toHours(a_time);
	final long min = TimeUnit.MILLISECONDS.toMinutes(a_time - TimeUnit.HOURS.toMillis(hr));
	final long sec = TimeUnit.MILLISECONDS.toSeconds(a_time - TimeUnit.HOURS.toMillis(hr) - TimeUnit.MINUTES.toMillis(min));
	final String strSec = String.format("%02d:%02d:%02d", hr, min, sec);
	return strSec;
	}
	}

view raw PhMainActivity.java hosted with ❤ by GitHub

위 예제는 하단 link 에서 확인할 수 있다.

https://github.com/parkho79/ServiceSample3