android-bluetooth

I am keep on getting the NoClassDefFoundError when my class is loaded. The code is taken from BluetoothLeGatt project - http://developer.android.com/samples/BluetoothLeGatt/project.html My code: // Device scan callback. private BluetoothAdapter.LeScanCallback mLeScanCallback = new BluetoothAdapter.LeScanCallback() { //java.lang.NoClassDefFoundError... @Override public void onLeScan(final BluetoothDevice device, final int rssi, final byte[] scanRecord) { runOnUiThread(new Runnable() { @Override public void run() { String msg= device.getAddress(); Log.d(TAG,msg); addItems(msg); } }); } };

@Override public void onServicesDiscovered(final BluetoothGatt gatt, int status) { super.onServicesDiscovered(gatt, status); if (status == BluetoothGatt.GATT_SUCCESS) { List<BluetoothGattCharacteristic> characteristics = null; List<BluetoothGattService> services = gatt.getServices(); //I am getting all services for (final BluetoothGattService service : services) { characteristics = service.getCharacteristics(); //I am getting all characteristics for each services } } } I am able to connect with BLE device and I am getting all services and characteristics, now I have send some commands, like to

I am developing an application where I have to connect to Bluetooth device on Android 4.3. And I want to change the name of CC2541 Keyfob via the Android application. My ideas is: 1.There has a Plain Text that I can type the name what I want in my Android application. 2.After I type the name, I push the button to send this text. 3.If the CC2541 receive this text from Android application , it will change the text in the deviceName[] of the following code in keyfobdemo.c: static uint8 deviceName[] = { // complete name 0x0b, // length of first data structure (11 bytes excluding length byte) 0x09,

BluetoothLeAdvertiser advertiser = BluetoothAdapter.getDefaultAdapter().getBluetoothLeAdvertiser(); This returns null. I have tried on an API 21 and on an API 23 device, but with the same result. I have no idea what I am missing? The app builds and runs just fine, until of course the advertiser is used and the app crashes. I appreciate any help provided! :) If you check the developer docs, link here . You'll see that the null object is returned in the following case: Returns a BluetoothLeAdvertiser object for Bluetooth LE Advertising operations. Will return null if Bluetooth is turned off or

With a normal Characteristics Read only the MTU Size (20bytes) of data will be read. My customer will offer a characteristics with a larger size (about 100bytes). I saw that BLE offers a "Long Read" feature which reads until the size of the characteristics is reached. ( https://bluegiga.zendesk.com/entries/25053373--REFERENCE-BLE-master-slave-GATT-client-server-and-data-RX-TX-basics ) attclient_read_long command - Starts a procedure where the client first sends normal read request to the server, and if the server returns an attribute value with a length equal to the BLE MTU (22 bytes), then