Question

我正在使用后台服务和活动进行扫描。因此，当后台服务和活动都并行运行时，扫描时不会给出任何信标。所以当扫描活动打开时我停止服务然后它给出了＃34;无法联系服务来设置扫描周期＆＃34;错误。之后扫描停止活动

Answer 1

我首先使用相同的设置 - 前景活动和后台服务，两者都与BLE外围设备通信。

但后来我重写了我的活动只是为了与服务沟通 - 只有后者与BLE外围设备进行通信：

public class MainActivity extends Activity {
    private Intent mServiceIntent;
    private ScanService mService;
    private ServiceConnection mServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
              ScanBinder sb = (ScanBinder) binder;
              mService = sb.getService();
              mService.setActivity(MainActivity.this);
              Utils.showToast(MainActivity.this, "Connected to service");
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
              Utils.showToast(MainActivity.this, "Disconnected from service");
              mService.setActivity(null);
              mService = null;
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mServiceIntent = new Intent(this, ScanService.class);
        startService(mServiceIntent);
......

public class ScanService extends Service {
    private Activity mActivity;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (mActivity != null)
            Utils.showToast(this, "Service (re)started");

        return START_STICKY;
    }

    public void setActivity(Activity activity) {
        mActivity = activity;
    }

这种沟通在Lars Vogel的9. Exercise: Define and consume local service教程中有所描述。

＆＃34;无法联系服务以设置扫描周期＆＃34; - 在扫描期间

1 个答案: