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I've been trying to develop an app which I could integrate with a RFID reader (I'm using a 1128 UHF RFID Reader). I've recently trying to learn how to use Bluetooth in android studio, i have create a simple app where I could turn on Bluetooth, find devices and pair with them. But I couldn't pair with the RFID reader. I'm new to android programming so I'm not sure how to do it properly.

Here is my code :

package com.siscaproject.sisca.Activity;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SwitchCompat;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.siscaproject.sisca.Adapter.BluetoothListAdapter;
import com.siscaproject.sisca.R;

import java.util.ArrayList;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnCheckedChanged;

public class HomeActivity extends AppCompatActivity

 private static final String TAG = "HomeActivity";

 private BluetoothAdapter mBluetoothAdapter;

 private BroadcastReceiver mBroadcastReceiver1 = new BroadcastReceiver() 
 @Override
 public void onReceive(Context context, Intent intent) 
 String action = intent.getAction();
 if(action.equals(mBluetoothAdapter.ACTION_STATE_CHANGED))
 final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, mBluetoothAdapter.ERROR);
 switch(state)
 case BluetoothAdapter.STATE_OFF:
 Log.d(TAG, "onReceive: STATE OFF");
 break;
 case BluetoothAdapter.STATE_TURNING_OFF:
 Log.d(TAG, "onReceive: STATE TURNING OFF");
 break;
 case BluetoothAdapter.STATE_ON:
 Log.d(TAG, "onReceive: STATE ON");
 break;
 case BluetoothAdapter.STATE_TURNING_ON:
 Log.d(TAG, "onReceive: STATE TURNING ON");
 break;
 
 
 
 ;

 private BroadcastReceiver mBroadcastReceiver2 = new BroadcastReceiver() 
 @Override
 public void onReceive(Context context, Intent intent) 
 final String action = intent.getAction();
 Log.d(TAG, "onReceive: ACTION FOUND");

 if(action.equals(BluetoothDevice.ACTION_FOUND))
 BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
 // Yang dimasukin ke arraylist cuma BluetoothClass 1f00
 if(device.getBluetoothClass().toString().equals("1f00"))
 listDevice.add(device);
 

 Log.d(TAG, "onReceive: " + device.getName() + ", " + device.getAddress());

 rv_list_device.setHasFixedSize(true);
 rv_list_device.setLayoutManager(new LinearLayoutManager(getApplicationContext()));

 BluetoothListAdapter listAdapter = new BluetoothListAdapter(listDevice,
 HomeActivity.this, mBluetoothAdapter);
 rv_list_device.setAdapter(listAdapter);
 
 
 ;

 private BroadcastReceiver mBroadcastReceiver3 = new BroadcastReceiver() 
 @Override
 public void onReceive(Context context, Intent intent) 
 final String action = intent.getAction();

 if(action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED))
 BluetoothDevice mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

 if(mDevice.getBondState() == BluetoothDevice.BOND_BONDED)
 Log.d(TAG, "BroadcastReceiver: BOND BONDED");
 
 else if(mDevice.getBondState() == BluetoothDevice.BOND_BONDING)
 Log.d(TAG, "BroadcastReceiver: BOND BONDING");
 
 else if(mDevice.getBondState() == BluetoothDevice.BOND_NONE)
 Log.d(TAG, "BroadcastReceiver: BOND NONE");
 
 
 
 ;

 @BindView(R.id.sw_bluetooth) SwitchCompat sw_bluetooth;

 @BindView(R.id.rv_list_device) RecyclerView rv_list_device;
 @BindView(R.id.srl_list_parent) SwipeRefreshLayout srl_list_parent;

 @BindView(R.id.tv_btWarning) TextView tv_btWarning;

 private BluetoothListAdapter rvAdapter;
 private ArrayList<BluetoothDevice> listDevice;



 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_home);

 ButterKnife.bind(this);

 rv_list_device.setHasFixedSize(true);
 rv_list_device.setLayoutManager(new LinearLayoutManager(this));

 rvAdapter = new BluetoothListAdapter(listDevice, HomeActivity.this, mBluetoothAdapter);
 rv_list_device.setAdapter(rvAdapter);

 IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
 registerReceiver(mBroadcastReceiver3, filter);

 listDevice = new ArrayList<>();

 srl_list_parent.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() 
 @Override
 public void onRefresh() 
 refreshDevice();
 new Handler().postDelayed(new Runnable() 
 @Override
 public void run() 
 srl_list_parent.setRefreshing(false);
 mBluetoothAdapter.cancelDiscovery();
 Log.d(TAG, "onRefresh: Canceling discovery");
 
 , 20000);
 
 );


 mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
 initialSwitch();
 

 private void initialSwitch()
 if(mBluetoothAdapter.isEnabled())
 sw_bluetooth.setChecked(true);
 srl_list_parent.setVisibility(View.VISIBLE);
 tv_btWarning.setVisibility(View.GONE);
 else if(!mBluetoothAdapter.isEnabled())
 sw_bluetooth.setChecked(false);
 srl_list_parent.setVisibility(View.GONE);
 tv_btWarning.setVisibility(View.VISIBLE);
 
 

 public void refreshDevice()
 listDevice.clear();

 Log.d(TAG, "refreshDevice: Looking for unpaired devices");

 if(mBluetoothAdapter.isDiscovering())
 mBluetoothAdapter.cancelDiscovery();
 Log.d(TAG, "refreshDevice: Canceling discovery");

 mBluetoothAdapter.startDiscovery();
 IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
 registerReceiver(mBroadcastReceiver2, discoverDevicesIntent);
 
 else if(!mBluetoothAdapter.isDiscovering())
 mBluetoothAdapter.startDiscovery();
 IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
 registerReceiver(mBroadcastReceiver2, discoverDevicesIntent);
 

 

 @Override
 protected void onDestroy() 
 Log.d(TAG, "onDestroy: called");
 super.onDestroy();

 try 
 if(mBroadcastReceiver1 != null)
 unregisterReceiver(mBroadcastReceiver1);
 mBroadcastReceiver1 = null;
 
 catch(RuntimeException e)
 Log.e(TAG, e.getMessage());
 

 try 
 if(mBroadcastReceiver2 != null)
 unregisterReceiver(mBroadcastReceiver2);
 mBroadcastReceiver2 = null;
 
 catch(RuntimeException e)
 Log.e(TAG, e.getMessage());
 

 try 
 if(mBroadcastReceiver3 != null)
 unregisterReceiver(mBroadcastReceiver3);
 mBroadcastReceiver3 = null;
 
 catch(RuntimeException e)
 Log.e(TAG, e.getMessage());
 

 finish();
 

 @OnCheckedChanged(R.id.sw_bluetooth)
 public void onSwitch()
 Log.d(TAG, "onSwitch: enabling/disabling bluetooth");

 if(sw_bluetooth.isChecked() == true)
 Log.d(TAG, "enableDisableBluetooth: enabling bluetooth");
 srl_list_parent.setVisibility(View.VISIBLE);
 tv_btWarning.setVisibility(View.GONE);
 mBluetoothAdapter.enable();

 IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
 registerReceiver(mBroadcastReceiver1, BTIntent);
 
 else if(sw_bluetooth.isChecked() == false)
 Log.d(TAG, "enableDisableBluetooth: disabling bluetooth");
 mBluetoothAdapter.disable();
 srl_list_parent.setVisibility(View.GONE);
 tv_btWarning.setVisibility(View.VISIBLE);
 listDevice.clear();

 IntentFilter BTIntent = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
 registerReceiver(mBroadcastReceiver1, BTIntent);
 
 else if(mBluetoothAdapter == null)
 Log.d(TAG, "enableDisableBluetooth: Doesn't have BT capabilities");
 
 

I could find my RFID reader device (it shows on the list), but I couldn't pair it. I've searched on how to do this but can't seem to find how to do it.