service例子

public class SendDataToServer extends Service{
	
	@Override  
    public void onCreate() {  
        super.onCreate();  
    }  
	
	@Override  
    public int onStartCommand(Intent intent, int flags, int startId) {  
		new Thread(new Runnable() {  
	        @Override  
	        public void run() {  
	            // 开始执行后台任务  
	        }  
	    }).start();  
        return super.onStartCommand(intent, flags, startId);  
    }  
      
    @Override  
    public void onDestroy() {  
        super.onDestroy();  
    }  
  
    @Override  
    public IBinder onBind(Intent intent) {  
        return null;  
    }  
    //与activity 绑定
    class MyBinder extends Binder {  
    	  
        public void startDownload() {  
            // 执行具体的下载任务  
        }  
    }  

public class MainActivity extends Activity implements OnClickListener {  
  
    private Button startService;  
  
    private Button stopService;  
  
    private Button bindService;  
  
    private Button unbindService;  
  
    private MyService.MyBinder myBinder;  
  
    private ServiceConnection connection = new ServiceConnection() {  
  
        @Override  
        public void onServiceDisconnected(ComponentName name) {  
        }  
  
        @Override  
        public void onServiceConnected(ComponentName name, IBinder service) {  
            myBinder = (MyService.MyBinder) service;  
            myBinder.startDownload();  
        }  
    };  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        startService = (Button) findViewById(R.id.start_service);  
        stopService = (Button) findViewById(R.id.stop_service);  
        bindService = (Button) findViewById(R.id.bind_service);  
        unbindService = (Button) findViewById(R.id.unbind_service);  
        startService.setOnClickListener(this);  
        stopService.setOnClickListener(this);  
        bindService.setOnClickListener(this);  
        unbindService.setOnClickListener(this);  
    }  
  
    @Override  
    public void onClick(View v) {  
        switch (v.getId()) {  
        case R.id.start_service:  
            Intent startIntent = new Intent(this, MyService.class);  
            startService(startIntent);  
            break;  
        case R.id.stop_service:  
            Intent stopIntent = new Intent(this, MyService.class);  
            stopService(stopIntent);  
            break;  
        case R.id.bind_service:  
            Intent bindIntent = new Intent(this, MyService.class);  
            bindService(bindIntent, connection, BIND_AUTO_CREATE);  
            break;  
        case R.id.unbind_service:  
            unbindService(connection);  
            break;  
        default:  
            break;  
        }  
    }  
  
}  

<service android:name="com.example.servicetest.MyService" >