How can read all characteristic's value of my BLE device?

Question

I\'m building an app with Android Studio that can read the value from a device BLE. This device, have 4 services. The fourth services have 3 characteristic. I want to read t

Answer 1

You can achive multiple reads with the following code: First create a List

private int ReadQueueIndex;
private List ReadQueue;

In onServicesDiscovered add characteristics in ReadQueue:

ReadQueue = new ArrayList<>();
ReadQueue.add(characteristicsList.get(2));        
ReadQueue.add(characteristicsList.get(1));            
ReadQueue.add(characteristicsList.get(0));
ReadQueueIndex = 2;
ReadCharacteristics(ReadQueueIndex);

Create ReadCharacteristics method

private void ReadCharacteristics(int index){
   bluetoothGatt.readCharacteristic(ReadQueue.get(index));
}

Then in your onCharacteristicRead callback:

String value =  Arrays.toString(characteristic.getValue());
if(characteristic.getUuid().equals(characteristicsList.get(0).getUuid())){
  Log.i("Characteristic 0:", value);
} else if(characteristic.getUuid().equals(characteristicsList.get(1).getUuid())){
  Log.i("Characteristic 1:", value);
} else if(characteristic.getUuid().equals(characteristicsList.get(2).getUuid())){
  Log.i("Characteristic 2:", value);
}
ReadQueue.remove(ReadQueue.get(ReadQueueIndex));
if (ReadQueue.size() >= 0) {
    ReadQueueIndex--;
    if (ReadQueueIndex == -1) {
       Log.i("Read Queue: ", "Complete");
    }
    else {
       ReadCharacteristics(ReadQueueIndex);
    }
 }

Hope its helpful.