Можно ли подключить приложение к устройству Bluetooth без сопряжения или знания чего-либо об устройстве до его поиска?

Question

Мне бы хотелось иметь линейку устройств, которые я использую для подключения к любому телефону, без запроса телефона на сопряжение. Я бы просто хотел, чтобы оно "спаривалось" через само приложение, пока устройство выполняет поиск, а мое приложение позаботится обо всем остальном. Возможно ли мое приложение сделать это?

Answer 1

Да, это возможно. Просто передайте адрес устройства Bluetooth этому классу обслуживания, к которому он подключится и будет работать в фоновом режиме.

  public class BluetoothServices extends Service {
    enter code here

private BluetoothAdapter mBluetoothAdapter;
public static final String B_DEVICE = "MY DEVICE";
public static final String B_UUID = "00001101-0000-1000-8000-00805f9b34fb";
// 00000000-0000-1000-8000-00805f9b34fb

public static final int STATE_NONE = 0;
public static final int STATE_LISTEN = 1;
public static final int STATE_CONNECTING = 2;
public static final int STATE_CONNECTED = 3;

private ConnectBtThread mConnectThread;
private static ConnectedBtThread mConnectedThread;

private static Handler mHandler = null;
public static int mState = STATE_NONE;
public static String deviceName;
public static BluetoothDevice sDevice = null;
public Vector<Byte> packData = new Vector<>(2048);

//IBinder mIBinder = new LocalBinder();


@Nullable
@Override
public IBinder onBind(Intent intent) {
    //mHandler = getApplication().getHandler();
    return mBinder;
}
public void toast(String mess){
    Toast.makeText(this,mess,Toast.LENGTH_SHORT).show();
}
private final IBinder mBinder = new LocalBinder();

public class LocalBinder extends Binder {
    BluetoothServices getService() {
        // Return this instance of LocalService so clients can call public methods
        return BluetoothServices.this;
    }
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    String deviceg = intent.getStringExtra("bluetooth_device");


    mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

            connectToDevice(deviceg);

    return START_STICKY;
}
private synchronized void connectToDevice(String macAddress){
    BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(macAddress);
    if (mState == STATE_CONNECTING){
        if (mConnectThread != null){
            mConnectThread.cancel();
            mConnectThread = null;
        }
    }
    if (mConnectedThread != null){
        mConnectedThread.cancel();
        mConnectedThread = null;
    }
    mConnectThread = new ConnectBtThread(device);
    toast("connecting");
    mConnectThread.start();
    setState(STATE_CONNECTING);
}
private void setState(int state){
    mState = state;
    if (mHandler != null){
       // mHandler.obtainMessage();
    }
}
public synchronized void stop(){
    setState(STATE_NONE);
    if (mConnectThread != null){
        mConnectThread.cancel();
        mConnectThread = null;
    }
    if (mConnectedThread != null){
        mConnectedThread.cancel();
        mConnectedThread = null;
    }
    if (mBluetoothAdapter != null){
        mBluetoothAdapter.cancelDiscovery();
    }

    stopSelf();
}

public void sendData(String message){
    if (mConnectedThread!= null){
        mConnectedThread.write(message.getBytes());
        toast("sent data");
    }else {
        Toast.makeText(BluetoothServices.this,"Failed to send data",Toast.LENGTH_SHORT).show();
    }
}

@Override
public boolean stopService(Intent name) {
    setState(STATE_NONE);

    if (mConnectThread != null){
        mConnectThread.cancel();
        mConnectThread = null;
    }

    if (mConnectedThread != null){
        mConnectedThread.cancel();
        mConnectedThread = null;
    }

    mBluetoothAdapter.cancelDiscovery();
    return super.stopService(name);
}

/*private synchronized void connected(BluetoothSocket mmSocket){

    if (mConnectThread != null){
        mConnectThread.cancel();
        mConnectThread = null;
    }
    if (mConnectedThread != null){
        mConnectedThread.cancel();
        mConnectedThread = null;
    }

    mConnectedThread = new ConnectedBtThread(mmSocket);
    mConnectedThread.start();


    setState(STATE_CONNECTED);
}*/

private class ConnectBtThread extends Thread{
    private final BluetoothSocket mSocket;
    private final BluetoothDevice mDevice;

    public ConnectBtThread(BluetoothDevice device){
        mDevice = device;
        BluetoothSocket socket = null;
        try {
            socket = device.createInsecureRfcommSocketToServiceRecord(UUID.fromString(B_UUID));
        } catch (IOException e) {
            e.printStackTrace();
        }
        mSocket = socket;

    }

    @Override
    public void run() {
        mBluetoothAdapter.cancelDiscovery();

        try {
            mSocket.connect();
            Log.d("service","connect thread run method (connected)");
            SharedPreferences pre = getSharedPreferences("BT_NAME",0);
            pre.edit().putString("bluetooth_connected",mDevice.getName()).apply();

        } catch (IOException e) {

            try {
                mSocket.close();
                Log.d("service","connect thread run method ( close function)");
            } catch (IOException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        }
        //connected(mSocket);
        mConnectedThread = new ConnectedBtThread(mSocket);
        mConnectedThread.start();
    }

    public void cancel(){

        try {
            mSocket.close();
            Log.d("service","connect thread cancel method");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

private class ConnectedBtThread extends Thread{
    private final BluetoothSocket cSocket;
    private final InputStream inS;
    private final OutputStream outS;

    private byte[] buffer;

    public ConnectedBtThread(BluetoothSocket socket){
        cSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        try {
            tmpIn = socket.getInputStream();

        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            tmpOut = socket.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }

        inS = tmpIn;
        outS = tmpOut;
    }

    @Override
    public void run() {
        buffer = new byte[1024];
        int mByte;
        try {
            mByte= inS.read(buffer);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Log.d("service","connected thread run method");

    }


    public void write(byte[] buff){
        try {
            outS.write(buff);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void cancel(){
        try {
            cSocket.close();
            Log.d("service","connected thread cancel method");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

@Override
public void onDestroy() {
    this.stop();
    super.onDestroy();
}