Connecting a Laser Distance Measurer (Bosch Disto GLM 50 C) with Smartphone (Android Studio) : <p>I got stuck at a special problem (I think). For a study project I have to make an Android application that can connect to a Laser Distance Measurer (Bosch GLM 50 C Distometer). So far I went through countless tutorials and hints here at Stackoverflow and other sources.</p>

<p>I'm new to Android and am sligthly overwhelmed. The task is to create an app, that reads the measured distance on the Bosch device and display/save it on the smartphone via Bluetooth.</p>

<p>Now my concrete question is: Is it possible to read the data (e.g. 2.083m) sent from the Bluetooth device? Any suggestions how to achieve that?</p>

<p>I'm able to establish a connection with the device, following this tutorial I found:</p>

<pre><code>package com.test.bluetooth;

import java.io.DataInputStream;

public class Main_Activity extends Activity implements OnItemClickListener {

TextView measuredValue;
ArrayAdapter&lt;String&gt; listAdapter;
ListView listView;
BluetoothAdapter btAdapter;
Set&lt;BluetoothDevice&gt; devicesArray;
ArrayList&lt;String&gt; pairedDevices;
ArrayList&lt;BluetoothDevice&gt; devices;
public static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
protected static final int SUCCESS_CONNECT = 0;
protected static final int MESSAGE_READ = 1;
IntentFilter filter;
BroadcastReceiver receiver;
String tag = "debugging";
Handler mHandler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        // TODO Auto-generated method stub
        Log.i(tag, "in handler");
        super.handleMessage(msg);
        switch(msg.what){
        case SUCCESS_CONNECT:
            // DO something
            ConnectedThread connectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
            // Toast.makeText(getApplicationContext(), "VERBUNDEN", 0).show();
            String s = "Verbindung erfolgreich";
            connectedThread.write(s.getBytes());
            Log.i(tag, "connected");
            break;
        case MESSAGE_READ:
            byte[] readBuf = (byte[])msg.obj;
            String string = new String(readBuf);
            // Toast.makeText(getApplicationContext(), string, 0).show();
            break;
        }
    }
};
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    init();
    if(btAdapter==null){
        // Toast.makeText(getApplicationContext(), "Bluetooth nicht verfügbar", 0).show();
        finish();
    }
    else{
        if(!btAdapter.isEnabled()){
            turnOnBT();
        }

        getPairedDevices();
        startDiscovery();
    }


}
private void startDiscovery() {
    // TODO Auto-generated method stub
    btAdapter.cancelDiscovery();
    btAdapter.startDiscovery();

}
private void turnOnBT() {
    // TODO Auto-generated method stub
    Intent intent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(intent, 1);
}
private void getPairedDevices() {
    // TODO Auto-generated method stub
    devicesArray = btAdapter.getBondedDevices();
    if(devicesArray.size()&gt;0){
        for(BluetoothDevice device:devicesArray){
            pairedDevices.add(device.getName());

        }
    }
}
private void init() {
    // TODO Auto-generated method stub
    listView=(ListView)findViewById(R.id.listView);
    listView.setOnItemClickListener(this);
    listAdapter= new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1,0);
    listView.setAdapter(listAdapter);
    btAdapter = BluetoothAdapter.getDefaultAdapter();
    pairedDevices = new ArrayList&lt;String&gt;();
    filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    devices = new ArrayList&lt;BluetoothDevice&gt;();
    receiver = new BroadcastReceiver(){
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            String action = intent.getAction();

            if(BluetoothDevice.ACTION_FOUND.equals(action)){
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                devices.add(device);
                String s = "";
                for(int a = 0; a &lt; pairedDevices.size(); a++){
                    if(device.getName().equals(pairedDevices.get(a))){
                        //append 
                        s = "Gekoppelt";
                        break;
                    }
                }

                listAdapter.add(device.getName()+" "+s+" "+"\n"+device.getAddress());
            }

            else if(BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)){
                // run some code
            }
            else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                // run some code



            }
            else if(BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)){
                if(btAdapter.getState() == btAdapter.STATE_OFF){
                    turnOnBT();
                }
            }

        }
    };

    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    registerReceiver(receiver, filter);
     filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
    registerReceiver(receiver, filter);
}


@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    unregisterReceiver(receiver);
}

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if(resultCode == RESULT_CANCELED){
            Toast.makeText(getApplicationContext(), "Bluetooth muss aktiviert sein", Toast.LENGTH_SHORT).show();
            finish();
        }
    }
    public void onItemClick(AdapterView&lt;?&gt; arg0, View arg1, int arg2,
            long arg3) {
        // TODO Auto-generated method stub

        if(btAdapter.isDiscovering()){
            btAdapter.cancelDiscovery();
        }
        if(listAdapter.getItem(arg2).contains("Gekoppelt")){

            BluetoothDevice selectedDevice = devices.get(arg2);
            ConnectThread connect = new ConnectThread(selectedDevice);
            connect.start();
            Log.i(tag, "in click listener");
        }
        else{
            // Toast.makeText(getApplicationContext(), "Gerät ist nicht gekoppelt", 0).show();
        }
    }

    private class ConnectThread extends Thread {

        private final BluetoothSocket mmSocket;
        private final BluetoothDevice mmDevice;

        public ConnectThread(BluetoothDevice device) {
            // Use a temporary object that is later assigned to mmSocket,
            // because mmSocket is final
            BluetoothSocket tmp = null;
            mmDevice = device;
            Log.i(tag, "construct");
            // Get a BluetoothSocket to connect with the given BluetoothDevice
            try {
                // MY_UUID is the app's UUID string, also used by the server code
                tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
            } catch (IOException e) { 
                Log.i(tag, "get socket failed");

            }
            mmSocket = tmp;
        }

        public void run() {
            // Cancel discovery because it will slow down the connection
            btAdapter.cancelDiscovery();
            Log.i(tag, "Verbindung - läuft");
            try {
                // Connect the device through the socket. This will block
                // until it succeeds or throws an exception
                mmSocket.connect();
                Log.i(tag, "Verbindung - erfolgreich");
            } catch (IOException connectException) {    Log.i(tag, "connect failed");
                // Unable to connect; close the socket and get out
                try {
                    mmSocket.close();
                } catch (IOException closeException) { }
                return;
            }

            // Do work to manage the connection (in a separate thread)

            mHandler.obtainMessage(SUCCESS_CONNECT, mmSocket).sendToTarget();
        }



        /** Will cancel an in-progress connection, and close the socket */
        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) { }
        }
    }

    private class ConnectedThread extends Thread {
        private final BluetoothSocket mmSocket;
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket) {
            mmSocket = socket;
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the input and output streams, using temp objects because
            // member streams are final
            try {
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            } catch (IOException e) { }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;

        }

        public void run() {
            byte[] buffer;  // buffer store for the stream
            int bytes; // bytes returned from read()

            // Keep listening to the InputStream until an exception occurs
            while (true) {
                try {
                    // Read from the InputStream
                    buffer = new byte[1024];
                    bytes = mmInStream.read(buffer);
                    // Send the obtained bytes to the UI activity
                    mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                            .sendToTarget();

                } catch (IOException e) {
                    break;
                }
            }
        }

        /* Call this from the main activity to send data to the remote device */
        public void write(byte[] bytes) {
            try {
                mmOutStream.write(bytes);
            } catch (IOException e) { }
        }

        /* Call this from the main activity to shutdown the connection */
        public void cancel() {
            try {
                mmSocket.close();
            } catch (IOException e) { }
        }
    }

}
</code></pre>

<p>After that, I found this example, that should read the incoming data from the device, but it didn't work:</p>

<pre><code>try {
        Log.d((String) this.getTitle(), "Closing Server Socket.....");
        mmServerSocket.close();``

        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the BluetoothSocket input and output streams

        tmpIn = socket.getInputStream();
        tmpOut = socket.getOutputStream();

        DataInputStream mmInStream = new DataInputStream(tmpIn);
        DataOutputStream mmOutStream = new DataOutputStream(tmpOut);

        // here you can use the Input Stream to take the string from the client  whoever is connecting
        //similarly use the output stream to send the data to the client


        text.setText(mmInStream.toString());
    } catch (Exception e) {
        //catch your exception here
    }
</code></pre>
