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In my Android project I'm trying to communicate a tablet with an Arduino device through the USB port, and it works for version 5.1 (API 22: Lollipop) but it doesn't for 6.0 (API 23: Marshmallow) because of the changes in permissions implemented in this Android version.

I've set my target SDK version to API 22, but still doesn't work.

In My Activity

@Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    [...]

    mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
    mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(
                ACTION_USB_PERMISSION), 0);
    IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
    registerReceiver(mUsbReceiver, filter);
    filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);

    UsbAccessory[] accessories = mUsbManager.getAccessoryList();
        UsbAccessory accessory = (accessories == null ? null : accessories[0]);
        if (accessory != null) {
            if (mUsbManager.hasPermission(accessory)) {
                openAccessory(accessory);
            } else {
                synchronized (mUsbReceiver) {
                    if (!mPermissionRequestPending) {
                        mUsbManager.requestPermission(accessory,
                                mPermissionIntent);
                        mPermissionRequestPending = true;
                    }
                }
            }
        }
    }

What's wrong? What I'm missing?

Jérôme
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Oriol Trujillo
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2 Answers2

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Finally it was that Arduino ADK (last update 2012) do not work for Android API versions higher than 6.0 (included), no matter how many permissions I did ask for. I had to change my strategy and make my Android device the host and the Arduino the accessory.

Problem solved, but the Arduino does not charge the tablet as was intended.

Oriol Trujillo
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Try to grant permission.

String permission = android.Manifest.permission.YOUR_PERMISSION;

private static void requestPermission(Activity activity) {

    if (hasPermission(permission)) return;

    ActivityCompat.requestPermissions(activity, new String[]{permission}, REQUEST_CODE);
}

public static boolean hasPermission() {
    return ContextCompat.checkSelfPermission(SupAndroid.appContext, permission) == PERMISSION_GRANTED;
}

Waiting for callback in onActivityResult of your Activity

Zeon
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  • I'm trying to do that, but I don't know which permissions would allow me to transfer and receive data through the USB port. – Oriol Trujillo Jul 11 '18 at 10:46
  • Finally it wasn't that, because I was using Arduino as host, therefore the permission requests should be included in the ADK module. But thanks anyway, requesting permissions in Android inspired the final solution. – Oriol Trujillo Jul 30 '18 at 06:58