My android app connects a Bluetooth device as a client.
1st try: The device gets connected and on closing the app, socket and iostreams gets closed.
2nd try: The device does not connect but I get the toast that says connected. No exceptions are encountered.
Turning the Bluetooth device Off and then on, makes the device to connect and problem persists
public class ConnectingThread extends Thread{
private ImageView connect;
private Context context;
private final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
private BluetoothAdapter mmAdapter;
public static BluetoothSocket mmSocket ;
private InputStream mmInStream ;
private OutputStream mmOutStream ;
private VibrotacDevice device;
public ConnectingThread(BluetoothDevice device, Context context, BluetoothAdapter adapter ) {
mmAdapter=adapter;
// connect=(ImageView) ((Activity)context).findViewById(R.id.connectionimg);
this.context=context;
BluetoothSocket tmp = null;
// Get a BluetoothSocket to connect with the given BluetoothDevice
try {
// MY_UUID is the app's UUID string, also used by the server code
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
Log.d("Mainbt", "inside constructor try");
} catch (IOException e) {
Log.d("Mainbt", "inside constructor catch: "+ e.getMessage());
Toast.makeText(context, e.getMessage(), Toast.LENGTH_SHORT).show();
}
mmSocket = tmp;
}
public void run() {
// Cancel discovery because it will slow down the connection
if(mmAdapter.isDiscovering())
mmAdapter.cancelDiscovery();
try {
// Connect the device through the socket. This will block
// until it succeeds or throws an exception
mmSocket.connect();
Log.d("Mainbt", "connecting");
} catch (final IOException connectException) {
// Unable to connect; close the socket and get out
((Activity) context).runOnUiThread(new Runnable() {
@Override
public void run() {
Log.d("Mainbt", " unable to connect"+ connectException.getMessage());
Toast.makeText(context, connectException.getMessage(), Toast.LENGTH_SHORT).show();
}
});
try {
mmSocket.close();
Log.d("Mainbt", " trying to close connection0");
((Activity) context).runOnUiThread(new Runnable() {
@Override
public void run() {
Log.d("Mainbt", " trying to close connection1");
// connect.setImageResource(R.drawable.connectionstatus_disconnected);
Toast.makeText(context, "Could not establish Connection", Toast.LENGTH_SHORT).show();
}
});
} catch (IOException closeException) {
}
return;
}
((Activity) context).runOnUiThread(new Runnable() {
@Override
public void run() {
Log.d("Mainbt", "connected");
// connect.setImageResource(R.drawable.connectionstatus_connected);
Toast.makeText(context, "Connected", Toast.LENGTH_SHORT).show();
}
});
connectingStreams();
}
public void connectingStreams( ){
try {
mmInStream = mmSocket.getInputStream();
mmOutStream =mmSocket.getOutputStream();
} catch (IOException e) {
}
try {
connectedVibration();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void cancel() {
if(mmInStream!=null){
try {
Log.d("Mainbt", "closingIstream");
mmInStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mmInStream=null;
Log.d("Mainbt", "closedIstream");
}
if(mmOutStream!=null){
try {
Log.d("Mainbt", "closingOstream");
mmOutStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
mmOutStream=null;
Log.d("Mainbt", "closedOstream");
}
}
public static void cancelSocket(){
if(mmSocket!=null){
try {
Log.d("Mainbt", "closingSocket");
mmSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d("Mainbt", "closedSocket");
mmSocket=null;
}
}
}
The above class is called from an Acticity which displays the device name and mac address in a diaog box, clicking it, initiates a connection
private void initializeBluetooth() {
adapter=BluetoothAdapter.getDefaultAdapter();
if(adapter==null){
Toast.makeText(getApplicationContext(), "Device does not support Bluetooth", Toast.LENGTH_SHORT).show();
finish();
} else{
//Checks if bluetooth is enabled
if(adapter.isEnabled()){
devices= new ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice );
Set<BluetoothDevice> pairedDevices=adapter.getBondedDevices();
// checks if any device have been paired previously
if(pairedDevices.size()> 0){
for(BluetoothDevice device: pairedDevices){
devices.add(device.getName()+"\n"+device.getAddress());
}
showPairedDialog();
}else{
//Dialog to scan new devices
showScanningDialog();
}
}else{
Intent enablebt= new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enablebt, REQUEST_ENABLE_BT);
}
}
}
private void showScanningDialog() {
AlertDialog.Builder builder= new AlertDialog.Builder(this);
builder.setTitle("No devices Paired");
builder.setMessage("Would you like to scan for devices");
builder.setNegativeButton("cancel", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.setPositiveButton("Scan", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//devices.clear();
Log.v("checkup", "inside onclick ");
discoverDevice();
}
});
builder.create();
builder.show();
}
private void showPairedDialog() {
AlertDialog.Builder builder= new AlertDialog.Builder(this);
builder.setTitle("Paired Devices");
builder.setAdapter(devices, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
Toast.makeText(getApplicationContext(), "Connecting to device...", Toast.LENGTH_SHORT).show();
//connect.setImageResource(R.drawable.connectionstatus_connecting);
String info= devices.getItem(item);
String address= info.substring(info.length()-17);
BluetoothDevice btDevice=adapter.getRemoteDevice(address);
ct= new ConnectingThread( btDevice,context,adapter );
ct.start();
}
});
builder.setNeutralButton("cancel", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.setPositiveButton("Scan", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getApplicationContext(), "Scanning...", Toast.LENGTH_SHORT).show();
devices.clear();
discoverDevice();
}
});
dialog= builder.create();
dialog.show();
}
private void discoverDevice() {
Log.v("checkup", "inside discover ");
adapter.startDiscovery();
receiver= new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice bluedevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if(bluedevice.getBondState()!=BluetoothDevice.BOND_BONDED){
// Add the name and address to an array adapter to show in a ListView
devices.add(bluedevice.getName() + "\n" + bluedevice.getAddress());
Toast.makeText(getApplicationContext(),bluedevice.getName() , Toast.LENGTH_SHORT).show();
}
}
}
};
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(receiver, filter);
AlertDialog.Builder builder= new AlertDialog.Builder(this);
builder.setAdapter(devices, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
Toast.makeText(getApplicationContext(), "Connecting to device...", Toast.LENGTH_SHORT).show();
String info= devices.getItem(item);
String address= info.substring(info.length()-17);
BluetoothDevice btDevice=adapter.getRemoteDevice(address);
ct= new ConnectingThread( btDevice,context,adapter);
ct.start();
}
});
builder.setNegativeButton("cancel", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.create();
builder.show();
}
@Override
protected void onActivityResult(int requestCode, int resultCode,Intent data){
if(requestCode==REQUEST_ENABLE_BT && resultCode==RESULT_OK){
initializeBluetooth();
}
}
Please help me out here
