Service Example

Service Example

 background daemon 방식의 서비스 예제이다. 웹 서핑과 음악 감상을 동시에 하는 앱을 만들고자 한다면 백그라운드 서비스를 통해 음악을 재생하면 된다.

 하기 예제는 서비스를 실행하면 핸들러에 의해서 1초 단위로 run() 함수가 실행된다. 마지막 run() 호출 후 1초 이내에 서비스를 종료하면 onDestroy()가 호출되어 mIsRunning이 false가 된다. 서비스를 manifest에 추가해주는 것도 잊지말자.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.serviceexmaple.mystoryg.serviceexample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <service android:name=".MyService" android:enabled="true" android:exported="true"></service> </application> </manifest>

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.serviceexmaple.mystoryg.serviceexample.MainActivity"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content"> <Button android:id="@+id/start_service" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Start Service" /> <Button android:id="@+id/stop_service" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Stop Service" /> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/view_service" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> </LinearLayout>

MainActivity.java

package com.serviceexmaple.mystoryg.serviceexample; import android.app.Activity; import android.content.ComponentName; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity { public static final String TAG = MainActivity.class.getSimpleName(); ComponentName mServiceName; TextView mTextView; // Intent mIntent; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mTextView = (TextView) findViewById(R.id.view_service); Button start = (Button) findViewById(R.id.start_service); start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startSrv(); } }); Button stop = (Button) findViewById(R.id.stop_service); stop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { stopSrv(); } }); } private void startSrv() { // mIntent = new Intent(this, MyService.class); // mServiceName = startService(mIntent); mServiceName = startService(new Intent(this, MyService.class)); Log.d(TAG, "mServiceName = " + mServiceName.toString()); mTextView.append("Service Start.\n"); } private void stopSrv() { if (null == mServiceName) { mTextView.append("Service is not start.\n"); return; } Intent intent = new Intent(); intent.setComponent(mServiceName); // if(stopService(mIntent)) { if (stopService(intent)) { mTextView.append("Service Stop.\n"); } else { mTextView.append("Service is already stop.\n"); } } }

MyService.class

package com.serviceexmaple.mystoryg.serviceexample; import android.app.Service; import android.content.Intent; import android.os.Handler; import android.os.IBinder; import android.util.Log; public class MyService extends Service implements Runnable { public static final String TAG = MyService.class.getSimpleName(); private int mStartId; private Handler mHandler; private boolean mIsRunning; public MyService() { } @Override public void onCreate() { Log.i(TAG, "onCreate()"); super.onCreate(); mIsRunning = false; mHandler = new Handler(); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.i(TAG, "startId = " + startId); mStartId = startId; if (!mIsRunning) { mHandler.postDelayed(this, 1000); mIsRunning = true; } return super.onStartCommand(intent, flags, startId); } @Override public void onDestroy() { Log.i(TAG, "onDestroy()"); mIsRunning = false; super.onDestroy(); } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. throw new UnsupportedOperationException("Not yet implemented"); } @Override public void run() { if (!mIsRunning) { Log.i(TAG, "It run after call onDestroy()"); } else { Log.i(TAG, "run()"); mHandler.postDelayed(this, 1000); } } }

실행 결과 log

12-17 17:24:34.700 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/ViewRootImpl: ViewRoot's Touch Event : ACTION_DOWN 12-17 17:24:34.789 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/ViewRootImpl: ViewRoot's Touch Event : ACTION_UP 12-17 17:24:34.794 11136-11136/com.serviceexmaple.mystoryg.serviceexample D/MainActivity: mServiceName = ComponentInfo{com.serviceexmaple.mystoryg.serviceexample/com.serviceexmaple.mystoryg.serviceexample.MyService} 12-17 17:24:34.795 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: onCreate() 12-17 17:24:34.807 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: startId = 1 12-17 17:24:35.810 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: run() 12-17 17:24:36.812 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: run() 12-17 17:24:37.814 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: run() 12-17 17:24:38.816 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: run() 12-17 17:24:39.819 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: run() 12-17 17:24:40.345 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/ViewRootImpl: ViewRoot's Touch Event : ACTION_DOWN 12-17 17:24:40.453 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/ViewRootImpl: ViewRoot's Touch Event : ACTION_UP 12-17 17:24:40.459 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: onDestroy() 12-17 17:24:40.820 11136-11136/com.serviceexmaple.mystoryg.serviceexample I/MyService: It run after call onDestroy()