问题
I want my ble service run in background even App is closed, that I can still read data. So I used "startService" instead of "bindService". I initialize & connect ble, but I have no idea why my BluetoothGattCallback doesnt work? Here is my code. Thanks.
回答1:
Your onCharacteristicRead() method is empty. You have to read the received amount of bytes in this method.
来源：https://stackoverflow.com/questions/22836739/android-ble-bluetoothgattcallback-not-work