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11 May 2017 12:44 AM

rainthinks Newbie

Total Posts: 8

Joined 2017-04-26

I'm using API

public static PccReleaseHandle<AntPlusHeartRatePcc> requestAccess(Context bindToContext, int antDeviceNumber, int searchProximityThreshold, IPluginAccessResultReceiver<AntPlusHeartRatePcc> resultReceiver, IDeviceStateChangeReceiver stateReceiver) 

to connect Ant+ Sensors.

I found that if I close the PccReleaseHandle before the device connected, the channel would not be released.

If all 8 devices found and connected successfully, it works perfectly after I finish and reopen the activity.

But if the device not be found, or I leave the activity before some of them be found, then I will encounter CHANNEL_NOT_AVAILABLE error when I reopen the activity. I have to restart the application to make it work again.

I'm not sure if this behavior caused by some bug in SDK or just I misused the API?

Anybody has any idea?

Thanks.

11 May 2017 12:46 AM #1

rainthinks Newbie

Total Posts: 8

Joined 2017-04-26

PM

my code below:

public class TrainingActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.training);
        // connect 8 sensors with an 8-channel adapter
        for (String sensorNumber : sensorsToConnect()) {
            releaseHandles.add(AntPlusHeartRatePcc.requestAccess(activity, sensorNumber, 0, accessResultReceiver, deviceStateChangeReceiver););
        }
    }

    @Override
    protected void onDestroy() 
      for (PccReleaseHandle releaseHandle : releaseHandles) {
        releaseHandle.close();
      }

      releaseHandles.clear();
      super.onDestroy(); 

11 May 2017 12:49 AM #2

rainthinks Newbie

Total Posts: 8

Joined 2017-04-26

PM

something wrong with the editor, have to remove some symbols in my code, or it not allow submit.

07 May 2018 10:49 AM #3

arrgh Sr. Member

Total Posts: 149

Joined 2014-04-02

PM

Digging up an old thread, but as I was recently following up on this same problem I will post.

Yes, this is a known issue. You should not use the release handle returned from requestAccess() because of this problem.

As a side note, you probably don't want to be managing your ANT+ connections from an Activity because of this. Use a Service. A started service will allow you to wait for the time needed to cleanup if the Activity onDestroy() happens during the connection, as well as adding better handling of phone configuration changes.

-Rohan

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16 August 2018 01:13 AM #4

Papashkin Newbie

Total Posts: 5

Joined 2018-07-30

PM

arrgh - 07 May 2018 10:49 AM
Yes, this is a known issue. You should not use the release handle returned from requestAccess() because of this problem.
As a side note, you probably don't want to be managing your ANT+ connections from an Activity because of this. Use a Service.

Is it correct to the issue when I want to find any types of devices? In my situation I can't start searching at all, but using requestAccess() for each type may be not preferable to me.

ANT Forum

Ant+ Android SDK not release channel properly

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