cleaned up.

android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothCommunication.java

@@ -80,10 +80,6 @@ public abstract class BluetoothCommunication {
         this.central = new BluetoothCentralManager(context, bluetoothCentralCallback, new Handler(Looper.getMainLooper()));
     }
 
-    public BluetoothCommunication() {
-
-    }
-
     protected boolean needReConnect() {
         if (callbackBtHandler == null) {
             return true;