problem with react component on Android 6

Luca

Hello,

I programmed the board to turn on the LED when angular speed goes above a threshold. This is the code:

Log.i(LOG_DATA_STREAM, "setupLedActivation started");
gyro.angularVelocity().addRouteAsync(new RouteBuilder() {
    @Override
    public void configure(RouteComponent source) {
        //source.split().index(0).filter(ThresholdOutput.ABSOLUTE,minAngularSpeed,1f).react(new RouteComponent.Action() {
        source.split().index(0).average((byte)3)
                .map(Function1.ABS_VALUE)
                .filter(ThresholdOutput.BINARY, minAngularSpeed, 10)
                .multicast()
                    .to()
                        .filter(Comparison.EQ, 1)
                            .react(new RouteComponent.Action() {
                                @Override
                                public void execute(DataToken token) {
                                    led.editPattern(Led.Color.GREEN, Led.PatternPreset.SOLID).commit();
                                    led.play();
                                }
                            })
                    .to().filter(Comparison.EQ, -1)
                        .react(new RouteComponent.Action() {
                            @Override
                            public void execute(DataToken token) {
                                led.stop(true);
                            }
                        });
    }
}).continueWith(
        new Continuation<Route, Void>() {
            @Override
            public Void then(Task<Route> task) throws Exception {
                if (task.isFaulted()) {
                    Log.e(LOG_DATA_STREAM, metawear.isConnected() ? "Error setting up route" : "Error connecting", task.getError());
                } else {
                    Log.i(LOG_DATA_STREAM, "setupLedActivation done");
                    onBoardRoute = task.getResult();
                    //debug = mwBoard.getModule(Debug.class);
                    //logging= mwBoard.getModule(Logging.class);
                }

                return null;
            }
        }
);

This works fine in Android 4.4, but on a different device with Android 6.0 it fails, with the following output in the Android Monitor:

12-29 16:56:49.545 10800-10800/it.beonsolutions.rehab_home I/DATA_STREAM: setupLedActivation started
12-29 16:56:50.002 10800-10968/it.beonsolutions.rehab_home E/DATA_STREAM: Error setting up route
  java.util.concurrent.TimeoutException: Creating data processor timed out
      at com.mbientlab.metawear.impl.DataProcessorImpl$1.run(DataProcessorImpl.java:129)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
      at java.util.concurrent.FutureTask.run(FutureTask.java:237)
      at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
                                                                              at java.lang.Thread.run(Thread.java:818)
12-29 16:56:50.035 10800-11346/it.beonsolutions.rehab_home W/BluetoothGatt: Unhandled exception in callback
  java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.Object java.util.Queue.poll()' on a null object reference
      at com.mbientlab.metawear.impl.DataProcessorImpl$2.onResponseReceived(DataProcessorImpl.java:138)
      at com.mbientlab.metawear.impl.JseMetaWearBoard$5.onMwNotifyCharChanged(JseMetaWearBoard.java:579)
      at com.mbientlab.metawear.android.BtleService$1.onCharacteristicChanged(BtleService.java:193)
      at android.bluetooth.BluetoothGatt$1.onNotify(BluetoothGatt.java:487)
      at android.bluetooth.IBluetoothGattCallback$Stub.onTransact(IBluetoothGattCallback.java:399)
      at android.os.Binder.execTransact(Binder.java:458)

Any help would be much appreciated.
Regards

Eric

• What version of the SDK are you running?
  
• What board are you using?
• What are the firmware and hardware revisions?
• What Android devices are you testing with?

Luca

metaware SKD: 3.0.0

for the board information, please see this screenshot:
https://www.dropbox.com/s/ftx6ysedj7h3mxl/Screenshot_2018-01-03-10-00-08.png?dl=0

Android device: Lenovo TB3-730X

Thanks & Regards
Luca

Eric

Are you using that device with both Android 4.4 and 6.0?  

The code works fine on my Android x86 VM and Nexus 5.  Try using another Android device.

Luca

What are you using to run Android 6 on a VM? I'm tried to use VirtualBox but I'm having troubles. Can you point me to some instructions?

Luca

OK, I tried on another device running Android 6 and the code worked fine.

Is there anything to do to understand the issue with the Lenovo tablet?

Eric

Based on the log output, it looks like the tablet needs more time to wait for a response from the remote device.  The latest Android SDK has an increased timeout period so I'd try updating your compile dependency.

Luca

I tried with 3.3.0 but then I get the following error during build:

Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the 'java' gradle plugin in a library submodule add
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.

I tried to follow the suggested solution but then other issues arise. Please give the correct project setup for 3.3.0.

Thanks and Regards

Eric

Read the project's README:

https://github.com/mbientlab/MetaWear-SDK-Android#adding-compile-dependency

Luca

Thank you. I checked that page but passed by the little note about SDK 3.3.

Luca

Yes, upgrade did the job done!
Thanks!