boolean Execute_BT_Search(){
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        boolean result = mBluetoothAdapter.isEnabled();
        if(result) {
            mArrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1);

            lvBTDevices = (ListView) findViewById(R.id.lvBTDevices);
            lvBTDevices.setAdapter(mArrayAdapter);

            lvBTDevices.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    Intent intent = new Intent();
                    intent.putExtra(getResources().getString(R.string.bt_dev_params), mArrayAdapter.getItem(position));
                    setResult(RESULT_OK, intent);
                    finish();
                }
            }); 

            // Register the BroadcastReceiver
            IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
            registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy

            mBluetoothAdapter.startDiscovery();
        }
        return result;
    }
  // Create a BroadcastReceiver for ACTION_FOUND
    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {

        BluetoothDevice device;

        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            Toast.makeText(gl_context, "Action = "+action, Toast.LENGTH_SHORT).show();
            // When discovery finds a device
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                // Get the BluetoothDevice object from the Intent
                device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                // Add the name and address to an array adapter to show in a ListView
                if(device!=null){
                    action = device.getName();

                    Toast.makeText(gl_context, "DeviceName = "+action, Toast.LENGTH_SHORT).show();

                } else
                    Toast.makeText(gl_context, "Found null device!!!", Toast.LENGTH_SHORT).show();
            }
            if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                Toast.makeText(gl_context, getResources().getString(R.string.msg_BT_discover_finished), Toast.LENGTH_SHORT).show();
            }
        }
    };