Message and File Transfer using Bluetooth in android

Question

I am developing an application in which first we have to search and connect available paired Bluetooth devices. I have done till connection. But after that I have put one screen which asks to choose between Text and file transfer. When I select text then one more screen will open in which there are edittext and button. Whatever user types in edittext and clicks on button that should be transferd to connected BT device like BT chat application. I have gone through BT chat app but it is complex to understand. I want a seperate function which does transferring task. Below is my connection code.

Main.java

public class Main extends Activity implements Runnable 
{
    protected static final String TAG = "TAG";
    private static final int REQUEST_CONNECT_DEVICE = 1;
    private static final int REQUEST_ENABLE_BT = 2;
    Button mScan;
    BluetoothAdapter mBluetoothAdapter;
    private UUID applicationUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
    private ProgressDialog mBluetoothConnectProgressDialog;
    private BluetoothSocket mBluetoothSocket;
    BluetoothDevice mBluetoothDevice;

    @Override
    public void onCreate(Bundle mSavedInstanceState) 
    {
        super.onCreate(mSavedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);
        mScan = (Button) findViewById(R.id.Scan);
        mScan.setOnClickListener(new View.OnClickListener() 
        {
            public void onClick(View mView) 
            {
                mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
                if (mBluetoothAdapter == null) 
                {
                    Toast.makeText(Main.this, "Message1", 2000).show();
                } 
                else 
                {
                    if (!mBluetoothAdapter.isEnabled()) 
                    {
                        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
                    } 
                    else 
                    {
                        ListPairedDevices();
                        Intent connectIntent = new Intent(Main.this, DeviceListActivity.class);
                        startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
                    }
                }
            }
        });

    }

    public void onActivityResult(int mRequestCode, int mResultCode, Intent mDataIntent) 
    {
        super.onActivityResult(mRequestCode, mResultCode, mDataIntent);

        switch (mRequestCode) 
        {
            case REQUEST_CONNECT_DEVICE:
                if (mResultCode == Activity.RESULT_OK) 
                {
                    Bundle mExtra = mDataIntent.getExtras();
                    String mDeviceAddress = mExtra.getString("DeviceAddress");
                    Log.v(TAG, "Coming incoming address " + mDeviceAddress);
                    mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(mDeviceAddress);
                    mBluetoothConnectProgressDialog = ProgressDialog.show(this, "Connecting...", mBluetoothDevice.getName() + " : " + mBluetoothDevice.getAddress(), true, false);
                    Thread mBlutoothConnectThread = new Thread(this);
                    mBlutoothConnectThread.start();
                    //pairToDevice(mBluetoothDevice); This method is replaced by progress dialog with thread
                }
                break;

            case REQUEST_ENABLE_BT:
                if (mResultCode == Activity.RESULT_OK) 
                {
                    ListPairedDevices();
                    Intent connectIntent = new Intent(Main.this, DeviceListActivity.class);
                    startActivityForResult(connectIntent, REQUEST_CONNECT_DEVICE);
                } 
                else 
                {
                    Toast.makeText(Main.this, "Message", 2000).show();
                }
                break;
        }
    }

    private void ListPairedDevices() 
    {
        Set<BluetoothDevice> mPairedDevices = mBluetoothAdapter.getBondedDevices();
        if (mPairedDevices.size() > 0) 
        {
            for (BluetoothDevice mDevice : mPairedDevices) 
            {
                Log.v(TAG, "PairedDevices: " + mDevice.getName() + " " + mDevice.getAddress());
            }
        }
    }

    public void run() 
    {
        try 
        {
            mBluetoothSocket = mBluetoothDevice.createRfcommSocketToServiceRecord(applicationUUID);
            mBluetoothAdapter.cancelDiscovery();
            mBluetoothSocket.connect();
            mHandler.sendEmptyMessage(0);
        }
        catch (IOException eConnectException) 
        {
            Log.d(TAG, "CouldNotConnectToSocket", eConnectException);
             closeSocket(mBluetoothSocket);
             return;
        }
    }

    private void closeSocket(BluetoothSocket nOpenSocket) 
    {
        try 
        {
            nOpenSocket.close();
            Log.d(TAG, "SocketClosed");
        } 
        catch (IOException ex) 
        {
            Log.d(TAG, "CouldNotCloseSocket");
        }
    }

    private Handler mHandler = new Handler() 
    {
        @Override
        public void handleMessage(Message msg) 
        {
            mBluetoothConnectProgressDialog.dismiss();
            Toast.makeText(Main.this, "Device Connected", 5000).show();

            Intent in = new Intent(getBaseContext(), Option.class);
            startActivity(in);

        }
    };
}

DeviceListActivity.java

public class DeviceListActivity extends Activity 
{
    protected static final String TAG = "TAG";
    private BluetoothAdapter mBluetoothAdapter;
    private ArrayAdapter<String> mPairedDevicesArrayAdapter;

    @Override
    protected void onCreate(Bundle mSavedInstanceState) 
    {
        super.onCreate(mSavedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.device_list);

        setResult(Activity.RESULT_CANCELED);
        mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);

        ListView mPairedListView = (ListView) findViewById(R.id.paired_devices);
        mPairedListView.setAdapter(mPairedDevicesArrayAdapter);
        mPairedListView.setOnItemClickListener(mDeviceClickListener);

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Set<BluetoothDevice> mPairedDevices = mBluetoothAdapter.getBondedDevices();

        if (mPairedDevices.size() > 0) 
        {
            findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
            for (BluetoothDevice mDevice : mPairedDevices) 
            {
                mPairedDevicesArrayAdapter.add(mDevice.getName() + "\n" + mDevice.getAddress());
            }
        } 
        else 
        {
            String mNoDevices = getResources().getText(R.string.none_paired).toString();
            mPairedDevicesArrayAdapter.add(mNoDevices);
        }
    }

    @Override
    protected void onDestroy() 
    {
        super.onDestroy();
        if (mBluetoothAdapter != null) 
        {
            mBluetoothAdapter.cancelDiscovery();
        }
    }

    private OnItemClickListener mDeviceClickListener = new OnItemClickListener() 
    {
        public void onItemClick(AdapterView<?> mAdapterView, View mView, int mPosition, long mLong) 
        {
            mBluetoothAdapter.cancelDiscovery();
            String mDeviceInfo = ((TextView) mView).getText().toString();
            String mDeviceAddress = mDeviceInfo.substring(mDeviceInfo.length() - 17);
            Log.v(TAG, "Device_Address " + mDeviceAddress);

            Bundle mBundle = new Bundle();
            mBundle.putString("DeviceAddress", mDeviceAddress);
            Intent mBackIntent = new Intent();
            mBackIntent.putExtras(mBundle);
            setResult(Activity.RESULT_OK, mBackIntent);
            finish();
        }
    };

}

option.xml

<?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="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/file" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/txt" />

</LinearLayout>

message.xml

<?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="vertical" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10" 
        android:hint="@string/hint">

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/send" />

</LinearLayout>

Answer 1

Call to following method:

private void sendDataToPairedDevice(String message ,BluetoothDevice device){       
       byte[] toSend = message.getBytes();
        try {
            BluetoothSocket socket = device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
            OutputStream mmOutStream = socket.getOutputStream();
            mmOutStream.write(toSend);
            // Your Data is sent to  BT connected paired device ENJOY.
        } catch (IOException e) {
            Log.e(TAG, "Exception during write", e);
        }
    }

Now Put following in Your Oncreate of the Activity with EditText.

EditText editText1 = (EditText) findViewById(R.id.editText1);

And Call above method like

sendDataToPairedDevice(editText1.getText() ,mBluetoothDevice);

in The Onclick of your desired button.

thats it. just upvote if you use it, thanks, enjoy buddy.

Answer 2

public void onClick(View v) {
                    // TODO Auto-generated method stub




                            mBluetoothAdapter1 = BluetoothAdapter.getDefaultAdapter();

                            byte[] toSend=message1.getBytes();

                            try
                            {

                                final UUID applicationUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
                                BluetoothDevice device=mBluetoothAdapter1.getRemoteDevice(MacAddress);
                                BluetoothSocket socket=device.createInsecureRfcommSocketToServiceRecord(applicationUUID);
                                OutputStream mmout=socket.getOutputStream();
                                mmout.write(toSend);
                                mmout.flush();
                                mmout.close();
                                socket.close();

                            }
                            catch (IOException e) 
                            {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }





                }
            });