Reading a gatt characteristic value in android studio notification

问题

I want to read a GATT characteristic value by the way of notification.

This means I need to set that characteristic to notify and then read the data.

I wish to do this in a function from an onclick.

When I run my activity the characteristics are found and added to this arraylist

private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics =
            new ArrayList<ArrayList<BluetoothGattCharacteristic>>();

I have the UUIDs of the service and characteristic values how do I get a characteristic out of this?

What I want is something like below:

BluetoothGattCharacteristic mycharacterisic;
 mycharacterisic = mGattCharacteristics.get(1).get(1);
mBluetoothLeService.setCharacteristicNotification(mycharacterisic, true);
//output to a text box via notification

The get(1).get(1) are just random parameters I have entered. How do I do it via the UUIDs?

Thanks

来源：https://stackoverflow.com/questions/60992229/reading-a-gatt-characteristic-value-in-android-studio-notification