How to receive serial data using android bluetooth

Question

I am new to android. I am designing an android application that receives serial data from a hardware device through bluetooth. I am working on Htc desire S. I used the sample Bluetooth chat code to receive data. But the data received is incorrect. It misses some values. Can anyone please provide me any other sample code to receive large amount of data through bluetooth and save it in a file.

Answer 1

try this code :

Activity:

package Android.Arduino.Bluetooth; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.widget.TextView; import android.widget.EditText;   import android.widget.Button; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Set; import java.util.UUID;  public class MainActivity extends Activity { TextView myLabel; EditText myTextbox; BluetoothAdapter mBluetoothAdapter; BluetoothSocket mmSocket; BluetoothDevice mmDevice; OutputStream mmOutputStream; InputStream mmInputStream; Thread workerThread; byte[] readBuffer; int readBufferPosition; int counter; volatile boolean stopWorker;  @Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      Button openButton = (Button)findViewById(R.id.open);     Button sendButton = (Button)findViewById(R.id.send);     Button closeButton = (Button)findViewById(R.id.close);     myLabel = (TextView)findViewById(R.id.label);     myTextbox = (EditText)findViewById(R.id.entry);      //Open Button     openButton.setOnClickListener(new View.OnClickListener()     {         public void onClick(View v)         {             try              {                 findBT();                 openBT();             }             catch (IOException ex) { }         }     });      //Send Button     sendButton.setOnClickListener(new View.OnClickListener()     {         public void onClick(View v)         {             try              {                 sendData();             }             catch (IOException ex) { }         }     });      //Close button     closeButton.setOnClickListener(new View.OnClickListener()     {         public void onClick(View v)         {             try              {                 closeBT();             }             catch (IOException ex) { }         }     }); }  void findBT() {     mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();     if(mBluetoothAdapter == null)     {         myLabel.setText("No bluetooth adapter available");     }      if(!mBluetoothAdapter.isEnabled())     {         Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);         startActivityForResult(enableBluetooth, 0);     }      Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();     if(pairedDevices.size() > 0)     {         for(BluetoothDevice device : pairedDevices)         {             if(device.getName().equals("MattsBlueTooth"))              {                 mmDevice = device;                 break;             }         }     }     myLabel.setText("Bluetooth Device Found"); }  void openBT() throws IOException {     UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID     mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);             mmSocket.connect();     mmOutputStream = mmSocket.getOutputStream();     mmInputStream = mmSocket.getInputStream();      beginListenForData();      myLabel.setText("Bluetooth Opened"); }  void beginListenForData() {     final Handler handler = new Handler();      final byte delimiter = 10; //This is the ASCII code for a newline character      stopWorker = false;     readBufferPosition = 0;     readBuffer = new byte[1024];     workerThread = new Thread(new Runnable()     {         public void run()         {                            while(!Thread.currentThread().isInterrupted() && !stopWorker)            {                 try                  {                     int bytesAvailable = mmInputStream.available();                                             if(bytesAvailable > 0)                     {                         byte[] packetBytes = new byte[bytesAvailable];                         mmInputStream.read(packetBytes);                         for(int i=0;i<bytesAvailable;i++)                         {                             byte b = packetBytes[i];                             if(b == delimiter)                             {      byte[] encodedBytes = new byte[readBufferPosition];      System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);      final String data = new String(encodedBytes, "US-ASCII");      readBufferPosition = 0;                                  handler.post(new Runnable()                                 {                                     public void run()                                     {                                         myLabel.setText(data);                                     }                                 });                             }                             else                             {                                 readBuffer[readBufferPosition++] = b;                             }                         }                     }                 }                  catch (IOException ex)                  {                     stopWorker = true;                 }            }         }     });      workerThread.start(); }  void sendData() throws IOException {     String msg = myTextbox.getText().toString();     msg += "\n";     mmOutputStream.write(msg.getBytes());     myLabel.setText("Data Sent"); }  void closeBT() throws IOException {     stopWorker = true;     mmOutputStream.close();     mmInputStream.close();     mmSocket.close();     myLabel.setText("Bluetooth Closed"); } } 

AND Here the layout:

<?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="fill_parent" android:layout_height="fill_parent" tools:ignore="TextFields,HardcodedText" >  <TextView     android:id="@+id/label"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="Type here:" />  <EditText     android:id="@+id/entry"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:layout_below="@id/label"     android:background="@android:drawable/editbox_background" />  <Button     android:id="@+id/open"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignParentRight="true"     android:layout_below="@id/entry"     android:layout_marginLeft="10dip"     android:text="Open" />  <Button     android:id="@+id/send"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignTop="@id/open"     android:layout_toLeftOf="@id/open"     android:text="Send" />  <Button     android:id="@+id/close"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignTop="@id/send"     android:layout_toLeftOf="@id/send"     android:text="Close" />  </RelativeLayout> 

Here for Manifest: add to Application

// permission must be enabled complete <manifest ....>      <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />     <uses-permission android:name="android.permission.BLUETOOTH" />     <application>       </application> </manifest>