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how to solve bluetooth connect() fails socket might be close

I'm trying to make an app that communicates with nearby devices.
My app is composed of the main activity that asks to enable bluetooth and sets the discoverable mode, so it waits for a connection to be made.
The second activity takes care of finding nearby devices and making the pairing.
After pairing pairing some configuration messages are exchanged and then both start a ThirdActivity that deals with the communication between the two devices.
I can successfully exchange these messages but the problem is that I need to pass the BluetoothService object (which keeps the communication information) to the Third Activity.
Since I don't think I can implement parcelable then I simply closed the connection without eliminating the pairing and then recreate AcceptThread and ConnectThread in the thirdActivity by creating a new BluetoothService object but always passing the same BluetoothDevice.
From the various logs what happens is that the AcceptThread waits on the accept(), while the ConnectThread fails the connect() reporting this error.
W/System.err: java.io.IOException: read failed, socket might closed or timeout, read ret: -1
at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:762)
at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:776)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:399)
at com.crossthebox.progetto.BluetoothService$ConnectThread.run(BluetoothService.java:118)
What can I do?
This is the BluetoothService Class
public class BluetoothService {
private UUID myid = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
private static final String appName = "myapp";
private static final int STATE_NONE = 0; // we're doing nothing
private static final int STATE_LISTEN = 1; // now listening for incoming connections
private static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
private static final int STATE_CONNECTED = 3;
private static final int STATE_BUFFER_NOT_EMPTY = 4;
private String message ="";
private int mState;
private final BluetoothAdapter mBluetoothAdapter;
Context mContext;
private AcceptThread mAcceptThread;
private ConnectThread mConnectThread;
private BluetoothDevice mDevice;
private UUID deviceUUID;
private ConnectedThread mConnectedThread;
public BluetoothService(Context context) {
mContext = context;
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
}
private class AcceptThread extends Thread {
private final BluetoothServerSocket bluetoothServerSocket;
public AcceptThread(){
BluetoothServerSocket tmp = null;
try{
tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(appName, myid);
}catch (IOException e){
}
bluetoothServerSocket = tmp;
mState = STATE_LISTEN;
}
public void run() {
BluetoothSocket socket = null;
try {
socket = bluetoothServerSocket.accept();
} catch (IOException e) {
}
if (socket != null) {
mState = STATE_CONNECTING;
connected(socket);
}
}
public void cancel() {
try {
bluetoothServerSocket.close();
} catch (IOException e) {
}
}
}
private class ConnectThread extends Thread {
private BluetoothSocket mSocket;
public ConnectThread(BluetoothDevice device, UUID uuid) {
mDevice = device;
deviceUUID = uuid;
}
public void run(){
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = mDevice.createRfcommSocketToServiceRecord(deviceUUID);
} catch (IOException e) {
}
mSocket = tmp;
mBluetoothAdapter.cancelDiscovery();
try {
mSocket.connect(); //this throws exception for socket close ( but only the second time)
} catch (IOException e) {
// Close the socket
try {
mSocket.close();
} catch (IOException e1) {
}
e.printStackTrace();
}
connected(mSocket);
}
public void cancel() {
try {
mSocket.close();
} catch (IOException e) {
}
}
}
public synchronized void start() {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mAcceptThread == null) {
mAcceptThread = new AcceptThread();
mAcceptThread.start();
}
}
public void startClient(BluetoothDevice device,UUID uuid){
mConnectThread = new ConnectThread(device, uuid);
mConnectThread.start();
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mSocket;
private final InputStream mInStream;
private final OutputStream mOutStream;
public ConnectedThread(BluetoothSocket socket) {
mSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
tmpIn = mSocket.getInputStream();
tmpOut = mSocket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
mInStream = tmpIn;
mOutStream = tmpOut;
}
public void run(){
byte[] buffer = new byte[1024];
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
// Read from the InputStream
try {
bytes = mInStream.read(buffer);
if(bytes != 0) {
String incomingMessage = new String(buffer, 0, bytes);
message = incomingMessage;
System.out.println("HO LETTO " + message);
mState = STATE_BUFFER_NOT_EMPTY;
}
} catch (IOException e) {
break;
}
}
}
//Call this from the main activity to send data to the remote device
public void write(byte[] bytes) {
try {
mOutStream.write(bytes);
} catch (IOException e) {
}
}
//termina la connessione
public void cancel() {
try {
mSocket.close();
} catch (IOException e) { }
}
}
private void connected(BluetoothSocket mSocket) {
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(mSocket);
mConnectedThread.start();
mState = STATE_CONNECTED;
}
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) {
return;}
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
public int getState(){
return mState;
}
public String getMessage(){
String tmp = null;
if(!message.equals("")){
tmp = message;
message = "";
}
mState = STATE_CONNECTED;
return tmp;
}
public void setState(int state){
this.mState = state;
}
public void cancel(){
if(mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
if(mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if(mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
}
}
MainActivity
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_transition);
/* * */
}
#Override
protected void onActivityResult(int requestCode, int resultCode, #Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
/* * */
if(requestCode == DISCOVER_REQUEST){
if(resultCode == 120){
bluetoothService = new BluetoothService(this);
bluetoothService.start();
//after receiving some message correctly
Intent thirdActivity = new Intent(this, com.project.ThirdActivity.class);
bluetoothService.cancel();
this.startActivity(thirdActivity);
finish();
}
if(resultCode == RESULT_CANCELED){
finish();
}
}
}
}
SecondActivity the way I cancel the connection is pretty the same as MainActivity. I close the socket after some message and then start ThirdActivity
ThirdActivity
if(mode == CLIENT){
BluetoothDEvice bluetoothDevice = getIntent().getExtras().getParcelable("btdevice");
bluetoothService.startClient(bluetoothDevice,myid);
}else //SERVER
bluetoothService.start();

Possible solution:
Pass the selected MAC address from Activity2 to Activity3
In Activity3 Start the ConnectThread in the Bluetooth Service.
Use a Handler to communicate between service and the Activity3.
Make sure you close the Thread when sockets disconnect.
A brilliant example is in the following link:
https://github.com/googlesamples/android-BluetoothChat

Android -(Thread) app will hang when I run a new thread

I have 3 activities in my android Application. In the first activity, on the click of a bluetooth device from the list of paired devices, I'm starting a service to keep the bluetooth connection visible to all the actives. In the service class I'm reading data continuously from the bluetooth device and I'm binding the second activity to the service class to read the data received.
I'm not able to get the instance of the binder outside the onServiceConnected() method of service connection method. So I'm calling a user-defined thread from onServiceConnected() method. In this way I'm getting values continuously from the service class. But the app will not respond after few seconds of successful execution.
It is blocking the main thread I think. But I'm not getting where I need to modify my code. The code below is my second Activity(MainActivity). "bluetoothManager" is my service class. I need to do a similar task in third activity also.
I'm not getting whether the problem is with binding or the thread. I need to call the thread outside of the Service connection class. If I do so, I'll get a null pointer exception. So I'm calling the thread from onServiceConnected() function where the binder object is not null. I have to use the boolean mIsBound for the while loop. But now it will be always true. Please help me. I'm new to android.
bluetoothManager.class
public class bluetoothManager extends Service{
final int handlerState = 0; // used to identify handler message
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder recDataString = new StringBuilder();
public ConnectedThread mConnectedThread;
static Handler bluetoothIn;
int bp;
String sensor0,sensor1;
static Handler mHandler;
// SPP UUID service - this should work for most devices
private static final UUID BTMODULEUUID = UUID
.fromString("00001101-0000-1000-8000-00805F9B34FB");
IBinder mBinder = new LocalBinder();
#Override
public IBinder onBind(Intent intent) {
return mBinder;
}
public class LocalBinder extends Binder {
bluetoothManager getService() {
return bluetoothManager.this;
}
}
#Override
public void onCreate() {
/// Toast.makeText(this, " MyService Created ", Toast.LENGTH_LONG).show();
// flag="created";
}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
return device.createRfcommSocketToServiceRecord(BTMODULEUUID);
// creates secure outgoing connecetion with BT device using UUID
}
public String getBPM(){
return sensor1;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, " MyService Started", Toast.LENGTH_LONG).show();
final String address=intent.getStringExtra("address");
final int currentId = startId;
if(address!=null)
{
btAdapter = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = createBluetoothSocket(device);
} catch (IOException e) {
Toast.makeText(getBaseContext(), "Socket creation failed",
Toast.LENGTH_LONG).show();
}
// Establish the Bluetooth socket connection.
try {
btSocket.connect();
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
// insert code to deal with this
}
}
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
// I send a character when resuming.beginning transmission to check
// device is connected
// If it is not an exception will be thrown in the write method and
// finish() will be called
mConnectedThread.write("x");
}
bluetoothIn = new Handler() {
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) { // if message is what we want
String readMessage = (String) msg.obj; // msg.arg1 = bytes
// from connect
// thread
recDataString.append(readMessage); // keep appending to
// string until ~
int endOfLineIndex = recDataString.indexOf("~"); // determine
// the
// end-of-line
if (endOfLineIndex > 0) { // make sure there data before ~
String dataInPrint = recDataString.substring(0,
endOfLineIndex); // extract string
//txtString.setText("Data Received = " + dataInPrint);
/*int dataLength = */dataInPrint.length(); // get length of
// data received
/*txtStringLength.setText("String Length = "
+ String.valueOf(dataLength));*/
if (recDataString.charAt(0) == '#') // if it starts with
// # we know it is
// what we are
// looking for
{
sensor0 = recDataString.substring(1,3);
// get
sensor1=sensor0;
Log.d("bpm", sensor0);
}
recDataString.delete(0, recDataString.length()); // clear
// all
// string
// data
// strIncom =" ";
dataInPrint = " ";
}
}
}
};
// get Bluetooth
// adapter
return currentId;
}
private class ConnectedThread extends Thread {
private final InputStream mmInStream;
private final OutputStream mmOutStream;
// creation of the connect thread
public ConnectedThread(BluetoothSocket socket) {
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
// Create I/O streams for connection
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer = new byte[256];
int bytes;
// Keep looping to listen for received messages
while (true) {
try {
bytes = mmInStream.read(buffer); // read bytes from input
// buffer
String readMessage = new String(buffer, 0, bytes);
// Send the obtained bytes to the UI Activity via handler
bluetoothIn.obtainMessage(handlerState, bytes, -1,
readMessage).sendToTarget();
} catch (IOException e) {
break;
}
}
}
// write method
public void write(String input) {
byte[] msgBuffer = input.getBytes(); // converts entered String into
// bytes
try {
mmOutStream.write(msgBuffer); // write bytes over BT connection
// via outstream
} catch (IOException e) {
// if you cannot write, close the application
Toast.makeText(getBaseContext(), "Connection Failure",
Toast.LENGTH_LONG).show();
}
}
}
#Override
public void onRebind(Intent intent) {
Log.v("myservice", "in onRebind");
super.onRebind(intent);
}
#Override
public boolean onUnbind(Intent intent) {
Log.v("myapp", "in onUnbind");
return true;
}
#Override
public void onDestroy() {
super.onDestroy();
Log.v("myservice", "in onDestroy");
}
}
MainActivity.java
public class MainActivity extends Activity {
private ServiceConnection mConnection;
TextView sensorView0;
boolean mIsBound;
bluetoothManager bm;
private Handler bpmHandler;
private ServiceConnection mConnection;
final int handlerState = 0; // used to identify handler message
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sensorView0 = (TextView) findViewById(R.id.bpm);
bpmHandler=new Handler(){
public void handleMessage(android.os.Message msg) {
if (msg.what == handlerState) {
String s=(String)msg.obj;
sensorView0.setText("BPM="+s);
}
}
};
}
#Override
public void onResume() {
super.onResume();
mConnection= new ServiceConnection() {
#Override
public void onServiceDisconnected(ComponentName name) {
mIsBound = false;
bm=null;
}
#Override
public void onServiceConnected(ComponentName name, IBinder service) {
LocalBinder myBinder = (LocalBinder)service;
mIsBound = true;
bm=myBinder.getService();
mConnectedService=new ConnectedService(mIsBound);
mConnectedService.start();
}
};
Intent intent = new Intent(this, bluetoothManager.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}
private class ConnectedService extends Thread {
final boolean bound;
public ConnectedService(boolean mIsBound){
bound =mIsBound;
}
public void run() {
String s;
while (bound) {
s= bm.getBPM();
Message msg = new Message();
msg.what =handlerState ;
msg.obj=s; MainActivity.this.bpmHandler.sendMessage(msg);
}
}
};
#Override
public void onPause() {
super.onPause();
unbindService(mConnection);
mIsBound = false;
}
}

I feel the connectedservice thread code is causing the issue. Instead of continuously racing grtBPM method, why don't you post the message only when there is a change. You can use local broadcast manager to broadcast the message from service and catch that in activity and update UI accordingly. The connectedservice thread runs continuously and keep posting the message to handler which is causing load on the main thread.

How to send same message one by one to a multiple device via bluetooth in android?

I have list of bluetooth device i just want to send a same message to each device one by one via bluetooth.But at this work i stuck.I am confuse to resolve this problem. Please help..Thanks in advance.. My code snippet is below:
public class BluetoothChatService {
// Debugging
private static final String TAG = "BluetoothChatService";
private static final boolean D = true;
// Name for the SDP record when creating server socket
private static final String NAME = "BluetoothChat";
// Unique UUID for this application
private static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
/**
* Constructor. Prepares a new BluetoothChat session.
* #param context The UI Activity Context
* #param handler A Handler to send messages back to the UI Activity
*/
public BluetoothChatService(Context context, Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
/**
* Set the current state of the chat connection
* #param state An integer defining the current connection state
*/
private synchronized void setState(int state) {
if (D) Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BluetoothChat.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
/**
* Return the current connection state. */
public synchronized int getState() {
return mState;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume() */
public synchronized void start() {
if (D) Log.d(TAG, "start");
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to listen on a BluetoothServerSocket
if (mAcceptThread == null) {
mAcceptThread = new AcceptThread();
mAcceptThread.start();
}
setState(STATE_LISTEN);
}
/**
* Start the ConnectThread to initiate a connection to a remote device.
* #param device The BluetoothDevice to connect
*/
public synchronized void connect(BluetoothDevice device) {
if (D) Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
* #param socket The BluetoothSocket on which the connection was made
* #param device The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
if (D) Log.d(TAG, "connected");
// Cancel the thread that completed the connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Cancel the accept thread because we only want to connect to one device
if (mAcceptThread != null) {mAcceptThread.cancel(); mAcceptThread = null;}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop() {
if (D) Log.d(TAG, "stop");
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
if (mAcceptThread != null) {mAcceptThread.cancel(); mAcceptThread = null;}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
* #param out The bytes to write
* #see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* Indicate that the connection was lost and notify the UI Activity.
*/
private void connectionLost() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* This thread runs while listening for incoming connections. It behaves
* like a server-side client. It runs until a connection is accepted
* (or until cancelled).
*/
private class AcceptThread extends Thread {
// The local server socket
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
tmp = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME, MY_UUID);
} catch (IOException e) {
Log.e(TAG, "listen() failed", e);
}
mmServerSocket = tmp;
}
public void run() {
if (D) Log.d(TAG, "BEGIN mAcceptThread" + this);
setName("AcceptThread");
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e) {
Log.e(TAG, "accept() failed", e);
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (BluetoothChatService.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate new socket.
try {
socket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D) Log.i(TAG, "END mAcceptThread");
}
public void cancel() {
if (D) Log.d(TAG, "cancel " + this);
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of server failed", e);
}
}
}
/**
* This thread runs while attempting to make an outgoing connection
* with a device. It runs straight through; the connection either
* succeeds or fails.
*/
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread");
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
connectionFailed();
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG, "unable to close() socket during connection failure", e2);
}
// Start the service over to restart listening mode
BluetoothChatService.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothChatService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
/**
* This thread runs during a connection with a remote device.
* It handles all incoming and outgoing transmissions.
*/
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
Log.d(TAG, "create ConnectedThread");
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
}
/**
* Write to the connected OutStream.
* #param buffer The bytes to write
*/
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
}
/**
* This is the main Activity that displays the current chat session.
*/
public class BluetoothChat extends Activity {
// Debugging
private static final String TAG = "BluetoothChat";
private static final boolean D = true;
public static String EXTRA_DEVICE_ADDRESS = "device_address";
// Message types sent from the BluetoothChatService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
private ArrayList<String> visible;
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private static final int REQUEST_ENABLE_BT = 2;
// Layout Views
private TextView mTitle;
private ListView mConversationView;
private EditText mOutEditText;
private Button mSendButton;
private String username = "";
private String data = "";
private int count = 0;
private int visible_length;
public String message="jsjasg" ;
// Name of the connected device
private String mConnectedDeviceName = null;
// Array adapter for the conversation thread
private ArrayAdapter<String> mConversationArrayAdapter;
// String buffer for outgoing messages
private StringBuffer mOutStringBuffer;
// Local Bluetooth adapter
private BluetoothAdapter mBluetoothAdapter = null;
// Member object for the chat services
private BluetoothChatService mChatService = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (D)
Log.e(TAG, "+++ ON CREATE +++");
// Set up the window layout
// requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
// getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,
// R.layout.custom_title);
setContentView(R.layout.main);
// Set up the custom title
// mTitle = (TextView) findViewById(R.id.title_left_text);
// mTitle.setText(R.string.app_name);
// mTitle = (TextView) findViewById(R.id.title_right_text);
// Get local Bluetooth adapter
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
// If the adapter is null, then Bluetooth is not supported
if (mBluetoothAdapter == null) {
Toast.makeText(this, "Bluetooth is not available",
Toast.LENGTH_LONG).show();
finish();
return;
}
}
#Override
public void onStart() {
super.onStart();
if (D)
Log.e(TAG, "++ ON START ++");
// If BT is not on, request that it be enabled.
// setupChat() will then be called during onActivityResult
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
// Otherwise, setup the chat session
} else {
if (mChatService == null)
setupChat();
}
}
#Override
public synchronized void onResume() {
super.onResume();
if (D)
Log.e(TAG, "+ ON RESUME +");
// Performing this check in onResume() covers the case in which BT was
// not enabled during onStart(), so we were paused to enable it...
// onResume() will be called when ACTION_REQUEST_ENABLE activity
// returns.
if (mChatService != null) {
// Only if the state is STATE_NONE, do we know that we haven't
// started already
if (mChatService.getState() == BluetoothChatService.STATE_NONE) {
// Start the Bluetooth chat services
//connect();
mChatService.start();
}
}
}
private void setupChat() {
Log.d(TAG, "setupChat()");
// Initialize the array adapter for the conversation thread
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
.getBondedDevices();
// If there are paired devices, add each one to the ArrayAdapter
mConversationArrayAdapter = new ArrayAdapter<String>(this,
R.layout.message);
mConversationView = (ListView) findViewById(R.id.in);
mConversationView.setAdapter(mConversationArrayAdapter);
// Initialize the compose field with a listener for the return key
mOutEditText = (EditText) findViewById(R.id.edit_text_out);
mOutEditText.setOnEditorActionListener(mWriteListener);
// Initialize the send button with a listener that for click events
mSendButton = (Button) findViewById(R.id.button_send);
mSendButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Send a message using content of the edit text widget
TextView view = (TextView) findViewById(R.id.edit_text_out);
message = view.getText.toString();
sendMessage(message);
}
});
// Initialize the BluetoothChatService to perform bluetooth connections
mChatService = new BluetoothChatService(this, mHandler);
// Initialize the buffer for outgoing messages
mOutStringBuffer = new StringBuffer("");
}
#Override
public synchronized void onPause() {
super.onPause();
if (D)
Log.e(TAG, "- ON PAUSE -");
}
#Override
public void onStop() {
super.onStop();
if (D)
Log.e(TAG, "-- ON STOP --");
}
#Override
public void onDestroy() {
super.onDestroy();
// Stop the Bluetooth chat services
if (mChatService != null)
mChatService.stop();
if (D)
Log.e(TAG, "--- ON DESTROY ---");
}
private void ensureDiscoverable() {
if (D)
Log.d(TAG, "ensure discoverable");
if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Intent discoverableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(
BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
}
/**
* Sends a message.
*
* #param message
* A string of text to send.
*/
private void sendMessage(String message) {
// Check that we're actually connected before trying anything
if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
Toast.makeText(this, R.string.not_connected, Toast.LENGTH_SHORT)
.show();
System.out.println("one two");
return;
}
// Check that there's actually something to send
if (message.length() > 0) {
// Get the message bytes and tell the BluetoothChatService to write
byte[] send = message.getBytes();
mChatService.write(send);
// Reset out string buffer to zero and clear the edit text field
mOutStringBuffer.setLength(0);
try {
JSONObject jsobj = new JSONObject(mOutStringBuffer.toString());
JSONArray json = jsobj.getJSONArray("login");
JSONObject _json = json.getJSONObject(0);
username = _json.getString("username");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mOutEditText.setText(mOutStringBuffer);
}
}
// The action listener for the EditText widget, to listen for the return key
private TextView.OnEditorActionListener mWriteListener = new TextView.OnEditorActionListener() {
public boolean onEditorAction(TextView view, int actionId,
KeyEvent event) {
// If the action is a key-up event on the return key, send the
// message
if (actionId == EditorInfo.IME_NULL
&& event.getAction() == KeyEvent.ACTION_UP) {
String message = view.getText().toString();
sendMessage(message);
}
if (D)
Log.i(TAG, "END onEditorAction");
return true;
}
};
// The Handler that gets information back from the BluetoothChatService
private final Handler mHandler = new Handler() {
#Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
if (D)
Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);
switch (msg.arg1) {
case BluetoothChatService.STATE_CONNECTED:
// mTitle.setText(R.string.title_connected_to);
// mTitle.append(mConnectedDeviceName);
mConversationArrayAdapter.clear();
break;
case BluetoothChatService.STATE_CONNECTING:
// mTitle.setText(R.string.title_connecting);
break;
case BluetoothChatService.STATE_LISTEN:
case BluetoothChatService.STATE_NONE:
// mTitle.setText(R.string.title_not_connected);
connect();
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
// construct a string from the buffer
String writeMessage = new String(writeBuf);
mConversationArrayAdapter.add("Me: " + writeMessage);
System.out.println("abcdefghijklmnopqrst");
//connect();
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
// construct a string from the valid bytes in the buffer
System.out.println("length"+readBuf.length);
String readMessage = new String(readBuf, 0, msg.arg1);
mConversationArrayAdapter.add(mConnectedDeviceName + ": "
+ readMessage);
}
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
Toast.makeText(getApplicationContext(),
"Connected to " + mConnectedDeviceName,
Toast.LENGTH_SHORT).show();
break;
case MESSAGE_TOAST:
Toast.makeText(getApplicationContext(),
msg.getData().getString(TOAST), Toast.LENGTH_SHORT)
.show();
break;
}
}
};
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (D)
Log.d(TAG, "onActivityResult " + resultCode);
switch (requestCode) {
case REQUEST_CONNECT_DEVICE:
// When DeviceListActivity returns with a device to connect
if (resultCode == Activity.RESULT_OK) {
// Get the device MAC address
visible=new ArrayList<String>();
visible=data.getExtras().getStringArrayList("device");
String address = data.getExtras().getString(
DeviceListActivity.EXTRA_DEVICE_ADDRESS);
count=0;
// Get the BLuetoothDevice object
BluetoothDevice device = mBluetoothAdapter
.getRemoteDevice(address);
// pairDevice(device);
// Attempt to connect to the device
mChatService.connect(device);
}
break;
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
if (resultCode == Activity.RESULT_OK) {
// Bluetooth is now enabled, so set up a chat session
setupChat();
} else {
// User did not enable Bluetooth or an error occured
Log.d(TAG, "BT not enabled");
Toast.makeText(this, R.string.bt_not_enabled_leaving,
Toast.LENGTH_SHORT).show();
finish();
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.option_menu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.scan:
// Launch the DeviceListActivity to see devices and do scan
Intent serverIntent = new Intent(this, DeviceListActivity.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);
return true;
case R.id.discoverable:
// Ensure this device is discoverable by others
ensureDiscoverable();
return true;
}
return false;
}
}
}
DeviceListActivity:
This activity is use to get all nearest android device mac address.

No enclosing instance of type Foo is accessible

I am creating a program used to connect to a embedded bluetooth device with a tablet/phone. My code consists largely of pieces of different code I have been given and I have found. The code dealing with the connection of bluetooth devices comes mostly from the source code for the program BlueTerm. I tried to eliminate the need for one of the given classes and have began getting some errors I don't know how to fix. This is the code for my starting Activity:
public class AndroidBluetooth extends Activity {
/** Called when the activity is first created. */
private static BluetoothAdapter myBtAdapter;
private static BluetoothDevice myBtDevice;
private ArrayAdapter<String> btArrayAdapter;
private ArrayList<BluetoothDevice> btDevicesFound = new ArrayList<BluetoothDevice>();
private Button btnScanDevice;
private TextView stateBluetooth;
private ListView listDevicesFound;
private InputStream iStream;
private OutputStream oStream;
private BluetoothSocket btSocket;
private String newDeviceAddress;
private BroadcastReceiver mReceiver;
private static BluetoothSerialService mSerialService = null;
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private static TextView mTitle;
// Message types sent from the BluetoothReadService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
// Name of the connected device
private String mConnectedDeviceName = null;
/**
* Set to true to add debugging code and logging.
*/
public static final boolean D = true;
/**
* Set to true to log each character received from the remote process to the
* android log, which makes it easier to debug some kinds of problems with
* emulating escape sequences and control codes.
*/
public static final boolean LOG_CHARACTERS_FLAG = D && false;
/**
* Set to true to log unknown escape sequences.
*/
public static final boolean LOG_UNKNOWN_ESCAPE_SEQUENCES = D && false;
private static final String TAG = "ANDROID BLUETOOTH";
private static final int REQUEST_ENABLE_BT = 2;
// Member fields
//private final Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
//private EmulatorView mEmulatorView;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
public int currentState;
public boolean customTitleSupported;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
currentState = 0;
customTitleSupported = requestWindowFeature( Window.FEATURE_CUSTOM_TITLE );
// Set up window View
setContentView(R.layout.main);
stateBluetooth = new TextView(this);
myBtAdapter = null;
startBluetooth();
CheckBlueToothState();
customTitleBar( getText( R.string.app_name).toString(), stateBluetooth.getText().toString() );
}
public void customTitleBar( String left, String right ) {
if( right.length() > 30 ) right = right.substring( 0, 20 );
if( customTitleSupported ) {
getWindow().setFeatureInt( Window.FEATURE_CUSTOM_TITLE, R.layout.customlayoutbar );
TextView titleTvLeft = (TextView) findViewById( R.id.titleTvLeft );
TextView titleTvRight = (TextView) findViewById( R.id.titleTvRight );
titleTvLeft.setText( left );
titleTvRight.setText( right );
}
}
public boolean onCreateOptionsMenu( Menu menu ) {
MenuInflater inflater = getMenuInflater();
inflater.inflate( R.menu.option_menu, menu );
return true;
}
public boolean onOptionsItemSelected( MenuItem item ) {
switch( item.getItemId() ) {
case R.id.connect:
startActivityForResult( new Intent( this, DeviceList.class ), REQUEST_CONNECT_DEVICE );
return true;
case R.id.preferences:
return true;
default:
return super.onContextItemSelected( item );
}
}
private void CheckBlueToothState() {
if( myBtAdapter == null ) {
stateBluetooth.setText("Bluetooth NOT supported" );
} else {
if( myBtAdapter.isEnabled() ) {
if( myBtAdapter.isDiscovering() ) {
stateBluetooth.setText( "Bluetooth is currently " +
"in device discovery process." );
} else {
stateBluetooth.setText( "Bluetooth is Enabled." );
}
} else {
stateBluetooth.setText( "Bluetooth is NOT enabled" );
Intent enableBtIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE );
startActivityForResult( enableBtIntent, REQUEST_ENABLE_BT );
}
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if(D) Log.d( TAG, "onActivityResult " + resultCode);
switch (requestCode) {
case REQUEST_CONNECT_DEVICE:
// When DeviceListActivity returns with a device to connect
if (resultCode == Activity.RESULT_OK) {
// Get the device MAC address
String address = data.getExtras()
.getString(DeviceList.EXTRA_DEVICE_ADDRESS);
// Get the BLuetoothDevice object
BluetoothDevice device = myBtAdapter.getRemoteDevice(address);
// Attempt to connect to the device
connect(device);
}
break;
case REQUEST_ENABLE_BT:
// When the request to enable Bluetooth returns
CheckBlueToothState();
}
}
public synchronized void connect(BluetoothDevice device) {
if (D) Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
mSerialService.setState(STATE_CONNECTING);
}
//In SDK15 (4.0.3) this method is now public as
//Bluetooth.fetchUuisWithSdp() and BluetoothDevice.getUuids()
public ParcelUuid[] servicesFromDevice(BluetoothDevice device) {
try {
Class cl = Class.forName("android.bluetooth.BluetoothDevice");
Class[] par = {};
Method method = cl.getMethod("getUuids", par);
Object[] args = {};
ParcelUuid[] retval = (ParcelUuid[]) method.invoke(device, args);
return retval;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
private final BroadcastReceiver ActionFoundReceiver = new BroadcastReceiver() {
public void onReceive( Context context, Intent intent ) {
String action = intent.getAction();
if( BluetoothDevice.ACTION_FOUND.equals( action ) ) {
BluetoothDevice btDevice = intent.getParcelableExtra( BluetoothDevice.EXTRA_DEVICE );
btDevicesFound.add( btDevice );
btArrayAdapter.add( btDevice.getName() + "\n" + btDevice.getAddress() );
btArrayAdapter.notifyDataSetChanged();
}
}
};
public static void startBluetooth(){
try {
myBtAdapter = BluetoothAdapter.getDefaultAdapter();
myBtAdapter.enable();
} catch ( NullPointerException ex ) {
Log.e( "Bluetooth", "Device not available" );
}
}
public static void stopBluetooth() {
myBtAdapter.disable();
}
}
About thirty lines up in the connect() method from the bottom is where the error occurs. The line mConnectThread = new ConnectThread( device ); is underlined and the error message says this:
No enclosing instance of type BluetoothSerialService is accessible. Must qualify the allocation with an enclosing instance of type BluetoothSerialService (e.g. x.new A() where x is an instance of BluetoothSerialService).
This is the code I currently have for the BluetoothSerialService:
public class BluetoothSerialService {
// Debugging
private static final String TAG = "BluetoothReadService";
private static final boolean D = true;
private static final UUID SerialPortServiceClass_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
//private EmulatorView mEmulatorView;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
/**
* Constructor. Prepares a new BluetoothChat session.
* #param context The UI Activity Context
* #param handler A Handler to send messages back to the UI Activity
*/
public BluetoothSerialService(Context context, Handler handler ) { //EmulatorView emulatorView) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
//mEmulatorView = emulatorView;
}
/**
* Set the current state of the chat connection
* #param state An integer defining the current connection state
*/
public synchronized void setState(int state) {
if (D) Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(AndroidBluetooth.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
/**
* Return the current connection state. */
public synchronized int getState() {
return mState;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume() */
public synchronized void start() {
if (D) Log.d(TAG, "start");
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
setState(STATE_NONE);
}
/**
* Start the ConnectThread to initiate a connection to a remote device.
* #param device The BluetoothDevice to connect
*/
public synchronized void connect(BluetoothDevice device) {
if (D) Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
* #param socket The BluetoothSocket on which the connection was made
* #param device The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
if (D) Log.d(TAG, "connected");
// Cancel the thread that completed the connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
//Message msg = mHandler.obtainMessage(BlueTerm.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
//bundle.putString(BlueTerm.DEVICE_NAME, device.getName());
//msg.setData(bundle);
//mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop() {
if (D) Log.d(TAG, "stop");
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
* #param out The bytes to write
* #see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed() {
setState(STATE_NONE);
// Send a failure message back to the Activity
//Message msg = mHandler.obtainMessage(BlueTerm.MESSAGE_TOAST);
Bundle bundle = new Bundle();
//bundle.putString(BlueTerm.TOAST, "Unable to connect device");
//msg.setData(bundle);
//mHandler.sendMessage(msg);
}
/**
* Indicate that the connection was lost and notify the UI Activity.
*/
private void connectionLost() {
setState(STATE_NONE);
// Send a failure message back to the Activity
//Message msg = mHandler.obtainMessage(BlueTerm.MESSAGE_TOAST);
Bundle bundle = new Bundle();
//bundle.putString(BlueTerm.TOAST, "Device connection was lost");
//msg.setData(bundle);
//mHandler.sendMessage(msg);
}
/**
* This thread runs while attempting to make an outgoing connection
* with a device. It runs straight through; the connection either
* succeeds or fails.
*/
public class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = device.createRfcommSocketToServiceRecord(SerialPortServiceClass_UUID);
} catch (IOException e) {
Log.e(TAG, "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread");
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
connectionFailed();
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG, "unable to close() socket during connection failure", e2);
}
// Start the service over to restart listening mode
//BluetoothSerialService.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothSerialService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
/**
* This thread runs during a connection with a remote device.
* It handles all incoming and outgoing transmissions.
*/
public class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
Log.d(TAG, "create ConnectedThread");
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
//mEmulatorView.write(buffer, bytes);
// Send the obtained bytes to the UI Activity
//mHandler.obtainMessage(BlueTerm.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
String a = buffer.toString();
a = "";
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
}
/**
* Write to the connected OutStream.
* #param buffer The bytes to write
*/
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
//mHandler.obtainMessage(BlueTerm.MESSAGE_WRITE, buffer.length, -1, buffer)
//.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
}

Is the BluetoothSerialService an inner class? If so, make it static.
See this post
No enclosing instance of type Server is accessible

Android passing bluetooth connection to another activities

I am working on an apps which is used to control a robotic car and the program is based on BluetoothChat, BluetoothChatService and DeviceListActivity.
In my First Activity, it is used to connect the Bluetooth and then jump to the next activity if connect successfully. The code is shown below:
private BluetoothAdapter mBluetoothAdapter = null;
private BluetoothSocket mBluetoothSocket = null;
...
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
...
}
#Override
public void onStart(){
super.onStart();
if(mService == null)
setupControl();
}
#Override
public synchronized void onResume(){
super.onResume();
if(mService != null){
if(mService.getState() == Service.STATE_NONE){
mService.start();
}
}
}
#Override
public synchronized void onPause() {
super.onPause();
}
#Override
public void onStop() {
super.onStop();
}
#Override
public void onDestroy() {
super.onDestroy();
if (mService != null) mService.stop();
}
private void sendMessage(String message) {
if (mService.getState() != Service.STATE_CONNECTED) {
Toast.makeText(this, "not connect", Toast.LENGTH_SHORT).show();
return;
}
if (message.length() > 0) {
byte[] send = message.getBytes();
mService.write(send);
}
}
private final Handler mHandler = new Handler() {
...
};
public void onClick(View v){
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
switch(v.getId()){
case R.id.tgbn_bt:
...
break;
case R.id.bt_connect:
if(mBluetoothDevice == null && tgbn_bt.isChecked()==true){
bt_connect.setText("Connect");
Intent intent = new Intent(this,DeviceListActivity.class);
startActivityForResult(intent,REQUEST_CONNECT_DEVICE);
}
...
}
break;
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case REQUEST_CONNECT_DEVICE:
if (resultCode == Activity.RESULT_OK) {
String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS);
mBluetoothDevice = mBluetoothAdapter.getRemoteDevice(address);
UUID uuid = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");
try{
mBluetoothDevice.createRfcommSocketToServiceRecord(uuid);
} catch (IOException e1){
//TODO Auto-genterated catch block
e1.printStackTrace();
}
mService.connect(mBluetoothDevice);
}
break;
}
}
}
And the Service program is based on BluetoothChatService and i had just make a little bit modify on it
public class Service extends Application{
// Debugging
private static final String TAG = "Service";
private static final boolean D = true;
// Name for the SDP record when creating server socket
private static final String NAME = "ProjectActivity";
// Unique UUID for this application
private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing
public static final int STATE_LISTEN = 1; // now listening for incoming connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing connection
public static final int STATE_CONNECTED = 3; // now connected to a remote device
/**
* Constructor. Prepares a new BluetoothChat session.
* #param context The UI Activity Context
* #param handler A Handler to send messages back to the UI Activity
*/
public Service(Context context, Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
/**
* Set the current state of the chat connection
* #param state An integer defining the current connection state
*/
private synchronized void setState(int state) {
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(ProjectActivity.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
/**
* Return the current connection state. */
public synchronized int getState() {
return mState;
}
/**
* Start the chat service. Specifically start AcceptThread to begin a
* session in listening (server) mode. Called by the Activity onResume() */
public synchronized void start() {
setState(STATE_LISTEN);
}
/**
* Start the ConnectThread to initiate a connection to a remote device.
* #param device The BluetoothDevice to connect
*/
public synchronized void connect(BluetoothDevice device) {
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
/**
* Start the ConnectedThread to begin managing a Bluetooth connection
* #param socket The BluetoothSocket on which the connection was made
* #param device The BluetoothDevice that has been connected
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
// Cancel the thread that completed the connection
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
// Cancel the accept thread because we only want to connect to one device
if (mAcceptThread != null) {mAcceptThread.cancel(); mAcceptThread = null;}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(ProjectActivity.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(ProjectActivity.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
/**
* Stop all threads
*/
public synchronized void stop() {
if (mConnectThread != null) {mConnectThread.cancel(); mConnectThread = null;}
if (mConnectedThread != null) {mConnectedThread.cancel(); mConnectedThread = null;}
if (mAcceptThread != null) {mAcceptThread.cancel(); mAcceptThread = null;}
setState(STATE_NONE);
}
/**
* Write to the ConnectedThread in an unsynchronized manner
* #param out The bytes to write
* #see ConnectedThread#write(byte[])
*/
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED) return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
/**
* Indicate that the connection attempt failed and notify the UI Activity.
*/
private void connectionFailed() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(ProjectActivity.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(ProjectActivity.TOAST, "Unable to connect device");
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_NONE);
}
/**
* Indicate that the connection was lost and notify the UI Activity.
*/
private void connectionLost() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(ProjectActivity.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(ProjectActivity.TOAST, "Device connection was lost");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
/**
* This thread runs while listening for incoming connections. It behaves
* like a server-side client. It runs until a connection is accepted
* (or until cancelled).
*/
private class AcceptThread extends Thread {
// The local server socket
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
} catch (IOException e) {
Log.e(TAG, "listen() failed", e);
}
mmServerSocket = tmp;
}
public void run() {
setName("AcceptThread");
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e) {
Log.e(TAG, "accept() failed", e);
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (Service.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate new socket.
try {
socket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D) Log.i(TAG, "END mAcceptThread");
}
public void cancel() {
if (D) Log.d(TAG, "cancel " + this);
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of server failed", e);
}
}
}
/**
* This thread runs while attempting to make an outgoing connection
* with a device. It runs straight through; the connection either
* succeeds or fails.
*/
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
connectionFailed();
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG, "unable to close() socket during connection failure", e2);
}
// Start the service over to restart listening mode
Service.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (Service.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
/**
* This thread runs during a connection with a remote device.
* It handles all incoming and outgoing transmissions.
*/
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 BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(ProjectActivity.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
//connectionLost();
break;
}
}
}
/**
* Write to the connected OutStream.
* #param buffer The bytes to write
*/
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(ProjectActivity.MESSAGE_WRITE, -1, -1, buffer)
.sendToTarget();
} catch (IOException e) {
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
}
}
}}
Then, i want to pass the Bluetooth connection to the other activity, for example the control panel activity:
public class ControlMethodActivity extends Activity {
static final String[] m=new String[] {"Arrow_Multi-Touch","Arrow_8 Buttons","Test2"};
//private TextView view;
private String holder;
private Spinner spinner;
private Button bt_Ok;
private ArrayAdapter<String> adapter;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.control_method);
bt_Ok = (Button) findViewById(R.id.bt_OK);
bt_Ok.setOnClickListener(new OnClickListener(){
public void onClick(View v){
if(holder=="Arrow_Multi-Touch"){
Intent i = new Intent(ControlMethodActivity.this,ArrowActivity.class);
startActivity(i);
}
else if(holder=="Arrow_8 Buttons"){
Intent i = new Intent(ControlMethodActivity.this,Arrow8Activity.class);
startActivity(i);
}
}
});
spinner = (Spinner) findViewById(R.id.method_spinner);
adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){
arg0.setVisibility(View.VISIBLE);
holder = arg0.getSelectedItem().toString();
}
public void onNothingSelected(AdapterView<?> arg0){
}
});
}}
What should I do?
Thank you for your nice advice and teaching....