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  1. import android.app.Activity;
  2. import android.bluetooth.BluetoothAdapter;
  3. import android.bluetooth.BluetoothDevice;
  4. import android.bluetooth.BluetoothSocket;
  5. import android.content.Intent;
  6. import android.os.Bundle;
  7. import android.os.Handler;
  8. import android.view.View;
  9. import android.widget.TextView;
  10. import android.widget.EditText;  
  11. import android.widget.Button;
  12. import java.io.IOException;
  13. import java.io.InputStream;
  14. import java.io.OutputStream;
  15. import java.util.Set;
  16. import java.util.UUID;
  17.  
  18. public class MainActivity extends Activity
  19. {
  20.     TextView myLabel;
  21.     EditText myTextbox;
  22.     BluetoothAdapter mBluetoothAdapter;
  23.     BluetoothSocket mmSocket;
  24.     BluetoothDevice mmDevice;
  25.     OutputStream mmOutputStream;
  26.     InputStream mmInputStream;
  27.     Thread workerThread;
  28.     byte[] readBuffer;
  29.     int readBufferPosition;
  30.     int counter;
  31.     volatile boolean stopWorker;
  32.  
  33.     @Override
  34.     public void onCreate(Bundle savedInstanceState)
  35.     {
  36.         super.onCreate(savedInstanceState);
  37.         setContentView(R.layout.activity_main);
  38.  
  39.         Button openButton = (Button)findViewById(R.id.open);
  40.         Button sendButton = (Button)findViewById(R.id.send);
  41.         Button closeButton = (Button)findViewById(R.id.close);
  42.         myLabel = (TextView)findViewById(R.id.label);
  43.         myTextbox = (EditText)findViewById(R.id.entry);
  44.  
  45.         //Open Button
  46.         openButton.setOnClickListener(new View.OnClickListener()
  47.         {
  48.             public void onClick(View v)
  49.             {
  50.                 try 
  51.                 {
  52.                     findBT();
  53.                     openBT();
  54.                 }
  55.                 catch (IOException ex) { }
  56.             }
  57.         });
  58.  
  59.         //Send Button
  60.         sendButton.setOnClickListener(new View.OnClickListener()
  61.         {
  62.             @Override
  63.         	public void onClick(View v)
  64.             {
  65.                 try 
  66.                 {
  67.                     sendData();
  68.                 }
  69.                 catch (IOException ex) { }
  70.             }
  71.         });
  72.  
  73.         //Close button
  74.         closeButton.setOnClickListener(new View.OnClickListener()
  75.         {
  76.             public void onClick(View v)
  77.             {
  78.                 try 
  79.                 {
  80.                     closeBT();
  81.                 }
  82.                 catch (IOException ex) { }
  83.             }
  84.         });
  85.     }
  86.  
  87.     void findBT()
  88.     {
  89.         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
  90.         if(mBluetoothAdapter == null)
  91.         {
  92.             myLabel.setText("No bluetooth adapter available");
  93.         }
  94.  
  95.         if(!mBluetoothAdapter.isEnabled())
  96.         {
  97.             Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
  98.             startActivityForResult(enableBluetooth, 0);
  99.         }
  100.  
  101.         Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
  102.         if(pairedDevices.size() > 0)
  103.         {
  104.             for(BluetoothDevice device : pairedDevices)
  105.             {
  106.  
  107.                 {
  108.                     myLabel.setText(device.getName());
  109.                 	mmDevice = device;
  110.                     break;
  111.                 }
  112.             }
  113.         }
  114.            }
  115.  
  116.     void openBT() throws IOException
  117.     {
  118.         UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); //Standard SerialPortService ID
  119.         mmSocket = mmDevice.createRfcommSocketToServiceRecord(uuid);        
  120.         mmSocket.connect();
  121.         mmOutputStream = mmSocket.getOutputStream();
  122.         mmInputStream = mmSocket.getInputStream();
  123.  
  124.         beginListenForData();
  125.  
  126.         myLabel.setText("Bluetooth Opened");
  127.     }
  128.  
  129.     void beginListenForData()
  130.     {
  131.         final Handler handler = new Handler(); 
  132.         final byte delimiter = 10; //This is the ASCII code for a newline character
  133.  
  134.         stopWorker = false;
  135.         readBufferPosition = 0;
  136.         readBuffer = new byte[1024];
  137.         workerThread = new Thread(new Runnable()
  138.         {
  139.             public void run()
  140.             {                
  141.                while(!Thread.currentThread().isInterrupted() && !stopWorker)
  142.                {
  143.                     try 
  144.                     {
  145.                         int bytesAvailable = mmInputStream.available();                        
  146.                         if(bytesAvailable > 0)
  147.                         {
  148.                             byte[] packetBytes = new byte[bytesAvailable];
  149.                             mmInputStream.read(packetBytes);
  150.                             for(int i=0;i<bytesAvailable;i++)
  151.                             {
  152.                                 byte b = packetBytes[i];
  153.                                 if(b == delimiter)
  154.                                 {
  155.                                     byte[] encodedBytes = new byte[readBufferPosition];
  156.                                     System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
  157.                                     final String data = new String(encodedBytes, "US-ASCII");
  158.                                     readBufferPosition = 0;
  159.  
  160.                                     handler.post(new Runnable()
  161.                                     {
  162.                                         public void run()
  163.                                         {
  164.                                             String t1=myLabel.getText().toString();
  165.                                             t1=t1+data;
  166.                                         	myLabel.setText(data);
  167.                                         }
  168.                                     });
  169.                                 }
  170.                                 else
  171.                                 {
  172.                                     readBuffer[readBufferPosition++] = b;
  173.                                 }
  174.                             }
  175.                         }
  176.                     } 
  177.                     catch (IOException ex) 
  178.                     {
  179.                         stopWorker = true;
  180.                     }
  181.                }
  182.             }
  183.         });
  184.  
  185.         workerThread.start();
  186.     }
  187.  
  188.     void sendData() throws IOException
  189.     {
  190.         String msg = myTextbox.getText().toString();
  191.         msg += "\n";
  192.         mmOutputStream.write(msg.getBytes());
  193.         myLabel.setText("Data Sent");
  194.     }
  195.  
  196.     void closeBT() throws IOException
  197.     {
  198.         stopWorker = true;
  199.         mmOutputStream.close();
  200.         mmInputStream.close();
  201.         mmSocket.close();
  202.         myLabel.setText("Bluetooth Closed");
  203.     }
  204. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:18: error: class MainActivity is public, should be declared in a file named MainActivity.java
public class MainActivity extends Activity
       ^
Main.java:1: error: package android.app does not exist
import android.app.Activity;
                  ^
Main.java:2: error: package android.bluetooth does not exist
import android.bluetooth.BluetoothAdapter;
                        ^
Main.java:3: error: package android.bluetooth does not exist
import android.bluetooth.BluetoothDevice;
                        ^
Main.java:4: error: package android.bluetooth does not exist
import android.bluetooth.BluetoothSocket;
                        ^
Main.java:5: error: package android.content does not exist
import android.content.Intent;
                      ^
Main.java:6: error: package android.os does not exist
import android.os.Bundle;
                 ^
Main.java:7: error: package android.os does not exist
import android.os.Handler;
                 ^
Main.java:8: error: package android.view does not exist
import android.view.View;
                   ^
Main.java:9: error: package android.widget does not exist
import android.widget.TextView;
                     ^
Main.java:10: error: package android.widget does not exist
import android.widget.EditText;  
                     ^
Main.java:11: error: package android.widget does not exist
import android.widget.Button;
                     ^
Main.java:18: error: cannot find symbol
public class MainActivity extends Activity
                                  ^
  symbol: class Activity
Main.java:20: error: cannot find symbol
    TextView myLabel;
    ^
  symbol:   class TextView
  location: class MainActivity
Main.java:21: error: cannot find symbol
    EditText myTextbox;
    ^
  symbol:   class EditText
  location: class MainActivity
Main.java:22: error: cannot find symbol
    BluetoothAdapter mBluetoothAdapter;
    ^
  symbol:   class BluetoothAdapter
  location: class MainActivity
Main.java:23: error: cannot find symbol
    BluetoothSocket mmSocket;
    ^
  symbol:   class BluetoothSocket
  location: class MainActivity
Main.java:24: error: cannot find symbol
    BluetoothDevice mmDevice;
    ^
  symbol:   class BluetoothDevice
  location: class MainActivity
Main.java:34: error: cannot find symbol
    public void onCreate(Bundle savedInstanceState)
                         ^
  symbol:   class Bundle
  location: class MainActivity
Main.java:33: error: method does not override or implement a method from a supertype
    @Override
    ^
Main.java:36: error: cannot find symbol
        super.onCreate(savedInstanceState);
        ^
  symbol:   variable super
  location: class MainActivity
Main.java:37: error: package R does not exist
        setContentView(R.layout.activity_main);
                        ^
Main.java:39: error: cannot find symbol
        Button openButton = (Button)findViewById(R.id.open);
        ^
  symbol:   class Button
  location: class MainActivity
Main.java:39: error: cannot find symbol
        Button openButton = (Button)findViewById(R.id.open);
                             ^
  symbol:   class Button
  location: class MainActivity
Main.java:39: error: package R does not exist
        Button openButton = (Button)findViewById(R.id.open);
                                                  ^
Main.java:40: error: cannot find symbol
        Button sendButton = (Button)findViewById(R.id.send);
        ^
  symbol:   class Button
  location: class MainActivity
Main.java:40: error: cannot find symbol
        Button sendButton = (Button)findViewById(R.id.send);
                             ^
  symbol:   class Button
  location: class MainActivity
Main.java:40: error: package R does not exist
        Button sendButton = (Button)findViewById(R.id.send);
                                                  ^
Main.java:41: error: cannot find symbol
        Button closeButton = (Button)findViewById(R.id.close);
        ^
  symbol:   class Button
  location: class MainActivity
Main.java:41: error: cannot find symbol
        Button closeButton = (Button)findViewById(R.id.close);
                              ^
  symbol:   class Button
  location: class MainActivity
Main.java:41: error: package R does not exist
        Button closeButton = (Button)findViewById(R.id.close);
                                                   ^
Main.java:42: error: cannot find symbol
        myLabel = (TextView)findViewById(R.id.label);
                   ^
  symbol:   class TextView
  location: class MainActivity
Main.java:42: error: package R does not exist
        myLabel = (TextView)findViewById(R.id.label);
                                          ^
Main.java:43: error: cannot find symbol
        myTextbox = (EditText)findViewById(R.id.entry);
                     ^
  symbol:   class EditText
  location: class MainActivity
Main.java:43: error: package R does not exist
        myTextbox = (EditText)findViewById(R.id.entry);
                                            ^
Main.java:46: error: package View does not exist
        openButton.setOnClickListener(new View.OnClickListener()
                                              ^
Main.java:60: error: package View does not exist
        sendButton.setOnClickListener(new View.OnClickListener()
                                              ^
Main.java:74: error: package View does not exist
        closeButton.setOnClickListener(new View.OnClickListener()
                                               ^
Main.java:89: error: cannot find symbol
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
                            ^
  symbol:   variable BluetoothAdapter
  location: class MainActivity
Main.java:97: error: cannot find symbol
            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            ^
  symbol:   class Intent
  location: class MainActivity
Main.java:97: error: cannot find symbol
            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                                         ^
  symbol:   class Intent
  location: class MainActivity
Main.java:97: error: cannot find symbol
            Intent enableBluetooth = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                                                ^
  symbol:   variable BluetoothAdapter
  location: class MainActivity
Main.java:101: error: cannot find symbol
        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
            ^
  symbol:   class BluetoothDevice
  location: class MainActivity
Main.java:104: error: cannot find symbol
            for(BluetoothDevice device : pairedDevices)
                ^
  symbol:   class BluetoothDevice
  location: class MainActivity
Main.java:131: error: cannot find symbol
        final Handler handler = new Handler(); 
              ^
  symbol:   class Handler
  location: class MainActivity
Main.java:131: error: cannot find symbol
        final Handler handler = new Handler(); 
                                    ^
  symbol:   class Handler
  location: class MainActivity
46 errors
stdout
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Standard output is empty
https://ideone.com/4V29sB
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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