error on emulator of eclipse

Question

I'm getting following error on emulator.I'm posting codes which is for communicating with paired Bluetooth device.I'm able to connect the Bluetooth device which is non Android,but when I add code for communication (read/write) it gives an error on emulator.Please suggest if anybody knows the solution.I'm new in Android.

                  "Unfortunately, App has stopped "

MainActivity.java

public class MainActivity extends Activity 
{

Button scanButton,connectButton,sendButton; 
EditText commands;
TextView out;

UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
private static final int REQUEST_ENABLE_BT=0;
private Set<BluetoothDevice> pairedDevices;
public static ArrayList<Object> BondedDeviceList;

BluetoothSocket mmSocket,mm;
BluetoothDevice mmDevice;
OutputStream mmOutputStream;
InputStream mmInputStream;
//private static String address = "00:06:66:04:62:73";
@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(com.example.bluecomm.R.layout.activity_list_item);
    scan();

}


public void scan() 
{
    scanButton = new Button(this);
    scanButton = (Button)findViewById(R.id.button1);
    scanButton.setOnClickListener(new Button.OnClickListener() 

      {
       @Override
        public void onClick(View v) 
        {
        if (mBluetoothAdapter == null) 
        {
        Toast toast = Toast.makeText(getApplicationContext(), "device not supported", Toast.LENGTH_SHORT);
        toast.show();
        }
        else
        {

          if (!mBluetoothAdapter.isEnabled()) 
           {
            Toast toast = Toast.makeText(getApplicationContext(), "MAKING YOUR DEVICE ENABLE", Toast.LENGTH_SHORT);
            toast.show();

            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
           }else{}

           pairedDevices = mBluetoothAdapter.getBondedDevices();
           if(pairedDevices==null)
            {
            //No Bonded Devices 
             Toast toast = Toast.makeText(getApplicationContext(), "No Bonded Devices", Toast.LENGTH_SHORT);
                   toast.show();
             }
             else
             {
             if (pairedDevices.size() > 0) 
             {
                // Loop through paired devices
              for (BluetoothDevice device : pairedDevices) 
              {
               if(device.getName().equals("RN_BS-6273"))
                {
                   mmDevice = device;
                   Toast toast = Toast.makeText(getApplicationContext(), "Device Found", Toast.LENGTH_SHORT);
                   toast.show();
                   break;
                }else{}

              }
             }else{}
            }
        }
        }
      });
    connectdevice();
}


public void connectdevice() 
{
    connectButton = new Button(this);
    connectButton = (Button)findViewById(R.id.button2);
    connectButton.setOnClickListener(new Button.OnClickListener() 
      {
       @Override
        public void onClick(View view)
       {

         try
         {

         mm = mmDevice.createRfcommSocketToServiceRecord(uuid);  
         Toast toast1 = Toast.makeText(getApplicationContext(), "uuid assigned", Toast.LENGTH_LONG);
            toast1.show();
         }
         catch(IOException e)
         {}
         mmSocket=mm;
         run();
     }

      public void run()
      {
          try
          {
              mmSocket.connect();
             // mmOutputStream = mmSocket.getOutputStream();
              //mmInputStream = mmSocket.getInputStream();
              if(mmSocket.isConnected())
              {
              Toast toast1 = Toast.makeText(getApplicationContext(), "device is connected", Toast.LENGTH_LONG);
                toast1.show();
              }
              else{}
             /* try
              {
                  int bytesAvailable = mmInputStream.available();
                  if(bytesAvailable > 0)
                  {
                      byte[] packetBytes = new byte[bytesAvailable];
                      mmInputStream.read(packetBytes);
                  }else{}*/
              }
          catch (IOException closeException) 
            { }
            return;
          }

      });


    send();
}



public void send() 
{
    commands=(EditText)findViewById(R.id.icon);
    sendButton = new Button(this);
    sendButton = (Button)findViewById(R.id.button3);
    sendButton.setOnClickListener(new Button.OnClickListener() 
      {
       @Override
        public void onClick(View view)
        {

            InputStream tmpIn = null;
            OutputStream tmpOut = null;

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

            mmInputStream = tmpIn;
            mmOutputStream = tmpOut;
            write();
        }

       public void write()
       {
        try
         {
       String msg = commands.getText().toString();
       msg += "\n";
       mmOutputStream.write(msg.getBytes());
      // mmInputStream.read();
         }
         catch (IOException close) 
         { 


              try {
                mmSocket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
              Toast toast1 = Toast.makeText(getApplicationContext(), "Socket closing....", Toast.LENGTH_LONG);
              toast1.show();

             } 

             return;
          }
      });
    }



  }

activity_list_item.xml

   <?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:text="Scan" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_below="@+id/button1"
android:text="Connect" />
<EditText
android:id="@+id/icon"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/button2"/>
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_below="@+id/icon"
android:text="Send" />
<TextView 
android:id="@+id/data"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button3"
android:text="DATA:"/>

</RelativeLayout>

Answer 1

You cannot use a BluetoothAdapter with an emulator. Check this post. Ideally try to test on a real device.
Concerning the crash, it's better to check the logs (using logcat) so that you get some details where this happens.