android中服务的使用

startservice和stopservice

public static class Controller extends Activity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            setContentView(R.layout.local_service_controller);

            Button button = (Button)findViewById(R.id.start);
            button.setOnClickListener(mStartListener);
            button = (Button)findViewById(R.id.stop);
            button.setOnClickListener(mStopListener);
        }

        private OnClickListener mStartListener = new OnClickListener() {
            public void onClick(View v) {
                startService(new Intent(Controller.this,
                        LocalService.class));
            }
        };

        private OnClickListener mStopListener = new OnClickListener() {
            public void onClick(View v) {
                stopService(new Intent(Controller.this,
                        LocalService.class));
            }
        };
    }

service.java类

public class LocalService extends Service {
	
    private NotificationManager mNM;
    
    @Override
    public void onCreate() {
        mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        showNotification();
    }
    
    private void showNotification() {
        CharSequence text = getText(R.string.local_service_started);

        Notification notification = new Notification(R.drawable.stat_sample, text,
                System.currentTimeMillis());

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, LocalServiceActivities.Controller.class), 0);

        notification.setLatestEventInfo(this, getText(R.string.local_service_label),
                       text, contentIntent);

        mNM.notify(R.string.local_service_started, notification);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("LocalService", "Received start id " + startId + ": " + intent);
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        mNM.cancel(R.string.local_service_started);

        Toast.makeText(this, R.string.local_service_stopped, Toast.LENGTH_SHORT).show();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
   
}

ServiceConnection的使用

public static class Binding extends Activity {
        private boolean mIsBound;
        private LocalService mBoundService;
        
        private ServiceConnection mConnection = new ServiceConnection() {
            public void onServiceConnected(ComponentName className, IBinder service) {
                mBoundService = ((LocalService.LocalBinder)service).getService();
                
                Toast.makeText(Binding.this, R.string.local_service_connected,
                        Toast.LENGTH_SHORT).show();
            }

            public void onServiceDisconnected(ComponentName className) {
                mBoundService = null;
                Toast.makeText(Binding.this, R.string.local_service_disconnected,
                        Toast.LENGTH_SHORT).show();
            }
        };
        
        void doBindService() {
            bindService(new Intent(Binding.this, 
                    LocalService.class), mConnection, Context.BIND_AUTO_CREATE);
            mIsBound = true;
        }
        
        void doUnbindService() {
            if (mIsBound) {
                unbindService(mConnection);
                mIsBound = false;
            }
        }
        
        @Override
        protected void onDestroy() {
            super.onDestroy();
            doUnbindService();
        }


        private OnClickListener mBindListener = new OnClickListener() {
            public void onClick(View v) {
                doBindService();
            }
        };

        private OnClickListener mUnbindListener = new OnClickListener() {
            public void onClick(View v) {
                doUnbindService();
            }
        };
        
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            setContentView(R.layout.local_service_binding);

            Button button = (Button)findViewById(R.id.bind);
            button.setOnClickListener(mBindListener);
            button = (Button)findViewById(R.id.unbind);
            button.setOnClickListener(mUnbindListener);
        }
    }

service.java类

public class LocalService extends Service {
	
    private NotificationManager mNM;
    private final IBinder mBinder = new LocalBinder();

    public class LocalBinder extends Binder {
        LocalService getService() {
            return LocalService.this;
        }
    }
    
    @Override
    public void onCreate() {
        mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        showNotification();
    }
    
    private void showNotification() {
        CharSequence text = getText(R.string.local_service_started);

        Notification notification = new Notification(R.drawable.stat_sample, text,
                System.currentTimeMillis());

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, LocalServiceActivities.Binding.class), 0);

        notification.setLatestEventInfo(this, getText(R.string.local_service_label),
                       text, contentIntent);

        mNM.notify(R.string.local_service_started, notification);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i("LocalService", "Received start id " + startId + ": " + intent);
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        mNM.cancel(R.string.local_service_started);

        Toast.makeText(this, R.string.local_service_stopped, Toast.LENGTH_SHORT).show();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }
   
}