I am trying to write a Bluetooth android application. I have used many
ideas from the samples and the bluetooth page in the android developers
site.
So, I put up a dialog that has the available bluetooth devices available,
there is only one, and when I pick it the dialog goes to a method to manage
the results of the dialog.
What I want to do is spawn a thread from this method that sits on a call
that blocks. I have the Thread and everything seems good, except the
dialog won't go away until the thread has been cancelled. But I can't
cancel it because I am stuck in a blocking dialog.
I have tried to create a Broadcast receiver to send myself a message,
hoping the dialog goes away before I get the message, but that doesn't work
either, the dialog still blocks until I remove it with a new instance that
doesn't fork the thread.
The question is, is there a good way to delay the thread running until the
dialog is down, whenever that is? Or is what I am doing supposed to work
and I have something else wrong.
//The dialog basically unchanged from the sample
public Dialog onCreateDialog(Bundle savedInstanceState) {
String[] deviceNames = getArguments().getStringArray("names");
int position = getArguments().getInt("position", -1);
if (position == -1) position = 0;
return new AlertDialog.Builder(getActivity())
.setTitle(R.string.select_device)
.setPositiveButton(R.string.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
which) {
((BrewActivity)
getActivity()).connectChannel();
}
})
.setSingleChoiceItems(deviceNames, position,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
which) {
((BrewActivity)
getActivity()).setDevice(which);
}
}
)
.create();
}
}
//The connect channel method where I send myself the message
private void connectChannel() {
Log.w(TAG, "Connect Channel.");
mConnectIndicator.setText(mRes.getString(R.string.connected));
mDataIndicator.setImageLevel(1);
Intent intent = new Intent();
intent.setAction("madigan.android.action.CONNECT");
sendBroadcast(intent);
}
//The broadcast receiver that gets the message I send myself.
private final BroadcastReceiver mConnector = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Log.w(TAG, "Connect Receiver.");
final String action = intent.getAction();
if (action.equals("madigan.android.action.CONNECT" ) ){
connect();
}
}
};
// The method called with the success of the broadcast
private void connect() {
Log.w(TAG, "Connect.");
// Starts connection Thread.
AcceptThread aThread = new AcceptThread();
aThread.run();
BluetoothServerSocket socket = connectDevice(mBluetoothAdapter,
mDevice);
try {
socket.accept();
}
catch(IOException e){
Log.w(TAG, "Accept with Exception.");
}
Log.w(TAG, "Accept with No Exception.");
}
// and finally the thread
private class AcceptThread extends Thread {
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
// Use a temporary object that is later assigned to
mmServerSocket,
// because mmServerSocket is final
BluetoothServerSocket tmp = null;
try {
// MY_UUID is the app's UUID string, also used by the
client code
tmp =
mBluetoothAdapter.listenUsingInsecureRfcommWithServiceRecord(mDevice.getName(),
UUID.randomUUID());
} catch (IOException e) { }
mmServerSocket = tmp;
}
public void run() {
BluetoothSocket socket = null;
// Keep listening until exception occurs or a socket is returned
while (true) {
try {
socket = mmServerSocket.accept();
} catch (IOException e) {
break;
}
// If a connection was accepted
if (socket != null) {
// Do work to manage the connection (in a separate
thread)
manageConnectedSocket(socket);
try {
mmServerSocket.close();
}
catch (IOException e){
break;
}
break;
}
}
}
/** Will cancel the listening socket, and cause the thread to
finish */
public void cancel() {
try {
mmServerSocket.close();
} catch (IOException e) { }
}
}
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