MyService重写的方法:
public class MyService extends Service { private final static String TAG = MyService.class.getSimpleName(); @Override public void onCreate() { super.onCreate(); Log.d(TAG, "onCreate()..."); } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); Log.d(TAG, "onStart()..."); } @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.d(TAG, "onStartCommand()..."); return super.onStartCommand(intent, flags, startId); } @Override public IBinder onBind(Intent intent) { Log.d(TAG, "onBind()..."); return null; } @Override public boolean onUnbind(Intent intent) { Log.d(TAG, "onUnbind()..."); return super.onUnbind(intent); } @Override public void onDestroy() { super.onDestroy(); Log.d(TAG, "onDestroy()..."); } }
MainActivity调用Service方法
public void startService(View view) { startService(new Intent(this, MyService.class)); } public void stopService(View view) { stopService(new Intent(this, MyService.class)); } public void bindService(View view) { bindService(new Intent(MainActivity.this, MyService.class), connection, Context.BIND_AUTO_CREATE); } public void unBindService(View view) { unbindService(connection); } private ServiceConnection connection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { } @Override public void onServiceDisconnected(ComponentName name) { } }; public void startMainActivity2(View view) { startActivity(new Intent(this, MainActivity2.class)); } @Override protected void onDestroy() { super.onDestroy(); unbindService(connection); }
startService stopService
第一次startService:
12-06 19:38:49.693 1958-1958/liudeli.service1 D/MyService: onCreate()...
12-06 19:38:49.693 1958-1958/liudeli.service1 D/MyService: onStartCommand()...
12-06 19:38:49.693 1958-1958/liudeli.service1 D/MyService: onStart()...
第二次startService:
12-06 19:38:55.433 1958-1958/liudeli.service1 D/MyService: onStartCommand()...
12-06 19:38:55.433 1958-1958/liudeli.service1 D/MyService: onStart()...
去点击stopService:
12-06 19:43:24.658 1958-1958/liudeli.service1 D/MyService: onDestroy()...
startService后:
bindService unBindService
bindService,多次点击bindService,只会出现一次:
12-06 19:49:27.800 1958-1958/liudeli.service1 D/MyService: onCreate()...
12-06 19:49:27.801 1958-1958/liudeli.service1 D/MyService: onBind()...
unBindService,点击unBindService,会执行:
12-06 20:47:58.903 4112-4112/liudeli.service1 D/MyService: onUnbind()...
12-06 20:47:58.903 4112-4112/liudeli.service1 D/MyService: onDestroy()...
startService stopService bindService unBindService
点击startService:
12-06 20:49:03.637 4235-4235/liudeli.service1 D/MyService: onCreate()...
12-06 20:49:03.638 4235-4235/liudeli.service1 D/MyService: onStartCommand()...
12-06 20:49:03.638 4235-4235/liudeli.service1 D/MyService: onStart()...
点击bindService:
12-06 20:49:08.867 4235-4235/liudeli.service1 D/MyService: onBind()...
点击unBindService:
12-06 20:49:32.640 4235-4235/liudeli.service1 D/MyService: onUnbind()...
点击stopService:
12-06 20:49:35.351 4235-4235/liudeli.service1 D/MyService: onDestroy()...
注意:Service是单例方式,onCreate() onDestroy() 只会创建一次
Service中是没有onStop()方法
Service中的只能由别人调用启动,Service自己不能启动
Service中停止可以由别人调用stopService,Service自己也可以调用stopSelf();
bindService不会在手机系统中显示运行服务
startService会在手机系统中显示运行服务
bindService是与Activity同生共死的,在界面结束后需要调用:Activity-->onDestroy(unBindService),AActivity绑定服务后只能AActivity解绑服务
startService是与Activity无关的,是在后台服务长时间运行的,AActivity启动的服务,可以用BActivity来停止服务
服务的特点是:在后台长时间的运行,不能直接的去执行耗时操作,需要通过异步方式去执行耗时操作,可以把Service想象成没有界面的Activity,区别是服务在后台长时间运行