Android-Service生命周期

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