[Android] 안드로이드 블루투스 (2) - Discoverable / Find device

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[Android] 안드로이드 블루투스 (2) - Discoverable / Find device 본문

Android

[Android] 안드로이드 블루투스 (2) - Discoverable / Find device

I-one 2020. 9. 9. 13:37

//1. Bluetooth on/off
//2. Discoverable / Find device
//3. Pairing device
//4. Send data

0. manifest 에 permission 을 추가한다.

(<manifest> 밑에 바로 넣으면 된다. )

<!--ble통신 권한-->
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> //이게 discover 권한

1. activity_main.xml 구성

(그냥 다른 기능 버튼들도 다 넣었다. 여기서는 이 세 버튼만 알면 된다.

<Button
        android:id="@+id/btnDiscover"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="디바이스 찾기 허용"
        app:layout_constraintStart_toStartOf="@+id/tvReceiveData"
        app:layout_constraintTop_toBottomOf="@+id/tvReceiveData" />

    <Button
        android:id="@+id/btnFindDiscover"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="디바이스 찾기"
        app:layout_constraintStart_toEndOf="@+id/btnDiscover"
        app:layout_constraintTop_toTopOf="@+id/btnDiscover" />

    <ListView
        android:id="@+id/newDevicesList"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        app:layout_constraintStart_toStartOf="@+id/btnDiscover"
        app:layout_constraintTop_toBottomOf="@+id/btnDiscover" />

--xml 전체코드

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btnBluetoothOn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="30dp"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="30dp"
        android:text="블루투스 ON"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btnBluetoothOff"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:text="블루투스 OFF"
        app:layout_constraintStart_toEndOf="@+id/btnBluetoothOn"
        app:layout_constraintTop_toTopOf="@+id/btnBluetoothOn" />

    <TextView
        android:id="@+id/tvBluetoothStatus"
        android:layout_width="170dp"
        android:layout_height="20dp"
        android:layout_marginTop="10dp"
        android:text="status"
        app:layout_constraintStart_toStartOf="@+id/btnBluetoothOn"
        app:layout_constraintTop_toBottomOf="@+id/btnBluetoothOn" />

    <Button
        android:id="@+id/btnConnect"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_marginTop="10dp"
        android:text="연결하기"
        app:layout_constraintStart_toStartOf="@+id/tvBluetoothStatus"
        app:layout_constraintTop_toBottomOf="@+id/tvBluetoothStatus" />

    <TextView
        android:id="@+id/tvReceiveData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="Receive"
        app:layout_constraintStart_toStartOf="@+id/btnSendData"
        app:layout_constraintTop_toBottomOf="@+id/btnSendData" />

    <Button
        android:id="@+id/btnSendData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="전송"
        app:layout_constraintStart_toStartOf="@+id/btnConnect"
        app:layout_constraintTop_toBottomOf="@+id/btnConnect" />

    <EditText
        android:id="@+id/tvSendData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Send Data"
        app:layout_constraintStart_toEndOf="@+id/btnSendData"
        app:layout_constraintTop_toTopOf="@+id/btnSendData" />

    <Button
        android:id="@+id/btnDiscover"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="디바이스 찾기 허용"
        app:layout_constraintStart_toStartOf="@+id/tvReceiveData"
        app:layout_constraintTop_toBottomOf="@+id/tvReceiveData" />

    <Button
        android:id="@+id/btnFindDiscover"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="디바이스 찾기"
        app:layout_constraintStart_toEndOf="@+id/btnDiscover"
        app:layout_constraintTop_toTopOf="@+id/btnDiscover" />

    <ListView
        android:id="@+id/newDevicesList"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        app:layout_constraintStart_toStartOf="@+id/btnDiscover"
        app:layout_constraintTop_toBottomOf="@+id/btnDiscover" />

</androidx.constraintlayout.widget.ConstraintLayout>

2. MainActivity.java에서 변수 초기화 / oncreate 부분 작성

activity_main.xml의 버튼들을 findViewById해서 연결해주고, onClickListener를 달았다.

public class MainActivity extends AppCompatActivity {

    BluetoothAdapter mBluetoothAdapter;

    Button btnDiscover;
    public ArrayList<BluetoothDevice> mBTdevices;
    public DeviceListAdapter mDeviceListAdapter;
    ListView newDevicesList;
    Button btnFindDiscover;

    //Mode
    final static int BT_REQUEST_ENABLE = 1;
    final static int BT_MESSAGE_READ = 2;
    final static int BT_CONNECTING_STATUS = 3;


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

        //initialize
        btnDiscover = findViewById(R.id.btnDiscover);
        btnFindDiscover = findViewById(R.id.btnFindDiscover);
        newDevicesList = (ListView) findViewById(R.id.newDevicesList);
        mBTdevices = new ArrayList<>();

        //get Defualt of blooth adapter
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        btnDiscover.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               bluetoothDiscovery();
            }
        });

        btnFindDiscover.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                bluetoothDiscover();
            }
        });

    }

3. bluetoothDiscovery() 메소드 작성

public void bluetoothDiscovery(){
        Toast.makeText(getApplicationContext(), "Making device discoverable for 300 seconds.",Toast.LENGTH_SHORT).show();

        Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,300);
        startActivity(discoverableIntent);

        //get scanmode change
        IntentFilter intentFilter = new IntentFilter(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
        registerReceiver(mBroadCastReceiver,intentFilter);
    }

Intent를 이용하여 내 기기의 블루투스 검색을 허용하는 창을 띄운다. (ACTION_REQUEST_DISCOVERABLE)

IntentFilter를 등록하여 broadCastReceiver가 'scan mode가 change됐을 때' 알림을 받도록한다. ( 브로드캐스트 코드는 5번에서)

4. bluetoothDiscover() 메소드 작성

public void bluetoothDiscover(){
        if(mBluetoothAdapter.isDiscovering()){ //already discovering > cancel
            mBluetoothAdapter.cancelDiscovery();
            Toast.makeText(getApplicationContext(), "Canceling discovery", Toast.LENGTH_SHORT).show();

            checkBTPermissions(); //check for permissions

            mBluetoothAdapter.startDiscovery();
            IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            registerReceiver(mBroadCastReceiver,discoverDevicesIntent);
        }

        else if(!mBluetoothAdapter.isDiscovering()){
            checkBTPermissions();
            Toast.makeText(getApplicationContext(), "Starting discovery", Toast.LENGTH_SHORT).show();

            mBluetoothAdapter.startDiscovery();
            IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            registerReceiver(mBroadCastReceiver,discoverDevicesIntent);
        }
    }

이미 찾는 중이라면 cancel 후 startDiscovery(), 아니라면 바로 startDiscovery()를 수행한다.

IntentFilter를 등록하여 broadCastReceiver가 'action 이 found됐을 때 ' 알림을 받도록한다. ( 브로드캐스트 코드는 5번에서)

**checkBTPermissions()는 사용자에게 블루투스를 검색 할 것인지 권한을 묻는 기능을 한다. 이를 작성하지 않을 시에는 intentfilter를 달았더라도 ACTION_FOUND에 대해 broadCastReceiver가 말을 듣지 않으니 반드시 작성해야 한다.

(위에서 checkBTPermissions();에 빨간 줄이 뜨는 것은 버전때문이나 빌드에는 이상이 없으므로 무시하면 된다.)

@RequiresApi(api = Build.VERSION_CODES.M)
    private void checkBTPermissions(){
        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
            int permissionCheck = this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
            permissionCheck += this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
            if(permissionCheck!=0){
                this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION},1001);
            }
            else{
                Log.d("checkPermission", "No need to check permissions. SDK version < LoLLIPOP");
            }
        }
    }

[Android] BluetoothDevice.ACTION_FOUND / 블루투스 디바이스 찾기 해도 BroadcastReceiver에 들어가지 않는 오류

mBluetoothAdapter.startDiscovery(); IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND); registerReceiver(mBroadCastReceiver,discoverDevicesIntent); 를 통해 인텐트필..

it-recording.tistory.com

5. broadCastReceiver()

    // Create a BroadcastReceiver
    private final BroadcastReceiver mBroadCastReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (action.equals(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED)) {
                final int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR);

                switch (mode) {
                    case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
                        Toast.makeText(getApplicationContext(), "Discoverability enabled", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
                        Toast.makeText(getApplicationContext(), "Discoverability Disabled. Able to receive connections", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.SCAN_MODE_NONE:
                        Toast.makeText(getApplicationContext(), "Discoverability Disabled. Not able to receive connections", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.STATE_CONNECTING:
                        Toast.makeText(getApplicationContext(), "Connecting...", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.STATE_CONNECTED:
                        Toast.makeText(getApplicationContext(), "Connected.",Toast.LENGTH_SHORT).show();
                        break;

                }
            }//end else if

            else if(action.equals(BluetoothDevice.ACTION_FOUND)){
                //get devices
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    mBTdevices.add(device);
                    Toast.makeText(getApplicationContext(), device.getName()+" : "+device.getAddress(), Toast.LENGTH_SHORT).show();
                    //attach device to adapter & set list
                    mDeviceListAdapter = new DeviceListAdapter(context,R.layout.device_adapter_view, mBTdevices);
                    newDevicesList.setAdapter(mDeviceListAdapter);
            }//end else if

        }//end onReceive
    };

3번과 4번에서 등록한 intenfilter 값을 들을 receiver를 작성한다.

각각 ACTION_SCAN_MODE_CHANGED ( 내 기기의 블루투스 스캔이 가능한지 상태)

, ACTION_FOUND (다른 기기를 찾았는지)

- 다른 기기를 찾았을 때 그 기기를 mBTdevices 라는 bluetoothDevice를 저장하는 arrayList에 add하고,

화면에 나타내기 위해 DeviceListAdapter 클래스를 추가 작성하여 구성한다. (7번)

+ onDestroy() 작성하기 (broadCastReceiver사용시 반드시 할 것)

@Override
    protected void onDestroy() {
        Toast.makeText(getApplicationContext(), "onDestroy called", Toast.LENGTH_SHORT).show();
        Log.d("onDestroy", "onDestroy called");
        super.onDestroy();
        unregisterReceiver(mBroadCastReceiver);
    }

6. device_adapter_view.xml 구성

찾은 기기의 name과 address를 보여줄 리스트의 xml을 구성한다.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:id="@+id/tvDeviceName"
        android:textSize="15sp"/>
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:id="@+id/tvDeviceAddress"
        android:textSize="15sp"/>


</LinearLayout>

7. DeviceListAdapter.java

찾은 기기를 device_adapter_view를 이용하여 화면에 띄운다.

package com.example.ble_train;

import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;

import java.util.ArrayList;
import java.util.List;

public class DeviceListAdapter extends ArrayAdapter<BluetoothDevice> {

    private LayoutInflater mLayoutInflater;
    private ArrayList<BluetoothDevice> mDevices;
    private int mViewResourceId;

    public DeviceListAdapter(Context context, int resourceId, ArrayList<BluetoothDevice> devices) {
        super(context, resourceId, devices);
        this.mDevices = devices;
        mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mViewResourceId = resourceId;
    }

    public View getView(int position , View convertView, ViewGroup parent){
        convertView = mLayoutInflater.inflate(mViewResourceId,null);
        BluetoothDevice device = mDevices.get(position);

        if(device!=null){
            TextView deviceName = (TextView) convertView.findViewById(R.id.tvDeviceName);
            TextView deviceAddress = (TextView) convertView.findViewById(R.id.tvDeviceAddress);
            //원래 null검사 해야하는데 검색되는 것중 null인게 있어서 뺌
            //if(deviceName !=null){
                deviceName.setText(device.getName());
            //}
            //else if(deviceAddress!=null){
                deviceAddress.setText(device.getAddress());
            //}
        }
        return convertView;
    }

}

--결과

디바이스 찾기를 누르면 다음과 같이 list가 뜬다.

(이름이 없는 것은 null인 것. )

=== MainActivity.java 전체 코드

package com.example.ble_train;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.icu.util.Output;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;

//1. Bluetooth on/off
//2. Discoverable / Find device
//3. Pairing device
//4. Send data

public class MainActivity extends AppCompatActivity {
    Button btnBluetoothOn;
    Button btnBluetoothOff;

    TextView tvBluetoothStatus;
    Button btnConnect;

    BluetoothAdapter mBluetoothAdapter;

    Button btnDiscover;
    public ArrayList<BluetoothDevice> mBTdevices;
    public DeviceListAdapter mDeviceListAdapter;
    ListView newDevicesList;
    Button btnFindDiscover;

    //Mode
    final static int BT_REQUEST_ENABLE = 1;
    final static int BT_MESSAGE_READ = 2;
    final static int BT_CONNECTING_STATUS = 3;


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

        //initialize
        btnBluetoothOn = findViewById(R.id.btnBluetoothOn);
        btnBluetoothOff = findViewById(R.id.btnBluetoothOff);
        tvBluetoothStatus = findViewById(R.id.tvBluetoothStatus);
        btnConnect = findViewById(R.id.btnConnect);
        btnDiscover = findViewById(R.id.btnDiscover);
        btnFindDiscover = findViewById(R.id.btnFindDiscover);
        newDevicesList = (ListView) findViewById(R.id.newDevicesList);
        mBTdevices = new ArrayList<>();

        //get Defualt of blooth adapter | get Permitted(Manifest)
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        //1. Bluetooth on/off
        btnBluetoothOn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                blueToothOn();
            }
        });

        btnBluetoothOff.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                blueToothOff();
            }
        });

        btnDiscover.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               bluetoothDiscovery();
            }
        });

        btnFindDiscover.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                bluetoothDiscover();
            }
        });

    }

    @RequiresApi(api = Build.VERSION_CODES.M)
    private void checkBTPermissions(){
        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP){
            int permissionCheck = this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
            permissionCheck += this.checkSelfPermission("Manifest.permission.ACCESS_FINE_LOCATION");
            if(permissionCheck!=0){
                this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.ACCESS_COARSE_LOCATION},1001);
            }
            else{
                Log.d("checkPermission", "No need to check permissions. SDK version < LoLLIPOP");
            }
        }
    }

    // Create a BroadcastReceiver
    private final BroadcastReceiver mBroadCastReceiver = new BroadcastReceiver() {
        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_ON:
                        Toast.makeText(getApplicationContext(), "Bluetooth On", Toast.LENGTH_SHORT).show();
                        tvBluetoothStatus.setText("Active");
                        break;
                    case BluetoothAdapter.STATE_OFF:
                        Toast.makeText(getApplicationContext(), "Bluetooth Off", Toast.LENGTH_SHORT).show();
                        tvBluetoothStatus.setText("NonActive");
                        break;
                    case BluetoothAdapter.STATE_TURNING_ON:
                        Toast.makeText(getApplicationContext(), "Bluetooth turning On", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.STATE_TURNING_OFF:
                        Toast.makeText(getApplicationContext(), "Bluetooth turning Off", Toast.LENGTH_SHORT).show();
                        break;
                }
            }//end if

            else if (action.equals(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED)) {
                final int mode = intent.getIntExtra(BluetoothAdapter.EXTRA_SCAN_MODE, BluetoothAdapter.ERROR);

                switch (mode) {
                    case BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE:
                        Toast.makeText(getApplicationContext(), "Discoverability enabled", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.SCAN_MODE_CONNECTABLE:
                        Toast.makeText(getApplicationContext(), "Discoverability Disabled. Able to receive connections", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.SCAN_MODE_NONE:
                        Toast.makeText(getApplicationContext(), "Discoverability Disabled. Not able to receive connections", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.STATE_CONNECTING:
                        Toast.makeText(getApplicationContext(), "Connecting...", Toast.LENGTH_SHORT).show();
                        break;
                    case BluetoothAdapter.STATE_CONNECTED:
                        Toast.makeText(getApplicationContext(), "Connected.",Toast.LENGTH_SHORT).show();
                        break;

                }
            }//end else if

            else if(action.equals(BluetoothDevice.ACTION_FOUND)){
                //get devices
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    mBTdevices.add(device);
                    Toast.makeText(getApplicationContext(), device.getName()+" : "+device.getAddress(), Toast.LENGTH_SHORT).show();
                    //attach device to adapter & set list
                    mDeviceListAdapter = new DeviceListAdapter(context,R.layout.device_adapter_view, mBTdevices);
                    newDevicesList.setAdapter(mDeviceListAdapter);
            }//end else if

        }//end onReceive
    };


    public void blueToothOn() {
        if (mBluetoothAdapter == null) {
            Toast.makeText(getApplicationContext(), "This device doesn't support bluetooth service", Toast.LENGTH_SHORT).show();
            tvBluetoothStatus.setText("NonActive");
        } else if (mBluetoothAdapter.isEnabled()) {
            Toast.makeText(getApplicationContext(), "Already On", Toast.LENGTH_SHORT).show();
        } else {
            //Toast.makeText(getApplicationContext(), "Bluetooth On",Toast.LENGTH_SHORT).show();
            //Ask user
            Intent intentBluetoothEnable = new Intent(mBluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(intentBluetoothEnable, BT_REQUEST_ENABLE);//BT_REQUEST_ENABLE : ModeId

            //Intercept Status changed (by.broadcast)
            IntentFilter BTIntent = new IntentFilter(mBluetoothAdapter.ACTION_STATE_CHANGED);
            registerReceiver(mBroadCastReceiver, BTIntent);

        }
    }

    public void blueToothOff() {
        if (!mBluetoothAdapter.isEnabled()) {
            Toast.makeText(getApplicationContext(), "Already OFF", Toast.LENGTH_SHORT).show();
        } else if (mBluetoothAdapter.isEnabled()) {
            //Toast.makeText(getApplicationContext(), "Bluetooth Off",Toast.LENGTH_SHORT).show();
            mBluetoothAdapter.disable();
        }
    }

    public void bluetoothDiscovery(){
        Toast.makeText(getApplicationContext(), "Making device discoverable for 300 seconds.",Toast.LENGTH_SHORT).show();

        Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION,300);
        startActivity(discoverableIntent);

        //get scanmode change
        IntentFilter intentFilter = new IntentFilter(mBluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
        registerReceiver(mBroadCastReceiver,intentFilter);
    }

    public void bluetoothDiscover(){
        if(mBluetoothAdapter.isDiscovering()){ //already discovering > cancel
            mBluetoothAdapter.cancelDiscovery();
            Toast.makeText(getApplicationContext(), "Canceling discovery", Toast.LENGTH_SHORT).show();

            checkBTPermissions(); //check for permissions

            mBluetoothAdapter.startDiscovery();
            IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            registerReceiver(mBroadCastReceiver,discoverDevicesIntent);
        }

        else if(!mBluetoothAdapter.isDiscovering()){
            checkBTPermissions();
            Toast.makeText(getApplicationContext(), "Starting discovery", Toast.LENGTH_SHORT).show();

            mBluetoothAdapter.startDiscovery();
            IntentFilter discoverDevicesIntent = new IntentFilter(BluetoothDevice.ACTION_FOUND);
            registerReceiver(mBroadCastReceiver,discoverDevicesIntent);
        }
    }

    @Override
    protected void onDestroy() {
        Toast.makeText(getApplicationContext(), "onDestroy called", Toast.LENGTH_SHORT).show();
        Log.d("onDestroy", "onDestroy called");
        super.onDestroy();
        unregisterReceiver(mBroadCastReceiver);
    }


}

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