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POInputStream doesn't read via Bluetooth
 

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  1. POInputStream doesn't read via Bluetooth
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    <p>I have two devices connected via Bluetooth. I want to send more String from a device to another but the method read() doesn't work correctly (only when I want to read the last String).</p> <p>The strange thing is that, it works fine with:</p> <pre><code>inStream.read(keyRead); outStream.write(answer.getBytes(charsetCod)); inStream.read(sizeRead); inStream.read(messageRead); inStream.read(timeSent); </code></pre> <p>But it doesn't work only when the application do:</p> <pre><code>int byteRead = inStream.read(alreadyReceived); </code></pre> <p>Someone could help me to understand why doesn't it read? (Sorry for my bad english)</p> <p>This is the code:</p> <p>When I read from InputStream:</p> <pre><code>public void run(BluetoothDevice device) { Log.i(TAG, "Sono nel run del ConnectedThread"); dev_recipient = btAdapter.getName(); // se sto per leggere, il destinatario sono io dev_sender = device.getName(); Log.i(TAG, "il mittente è: " + dev_sender); Log.i(TAG, "Il destinatario è " + dev_recipient); mac_sender = device.getAddress(); mac_recipient = btAdapter.getAddress(); byte[] keyRead = new byte[50]; byte[] sizeRead = new byte[10]; byte[] timeSent = new byte[100]; byte[] alreadyReceived = new byte[500]; String message; String sentTime; while (true) { // finchè è connesso try { messDB = new MessagesDatabase(context); messDB.getWritableDatabase(); Log.i(TAG, "Destinatario: Ricevo la chiave del messaggio"); inStream.read(keyRead); String keyS = new String(keyRead); int indkeyS = keyS.indexOf("#end", 0); String key = keyS.substring(0, indkeyS); Log.i(TAG, "Stringa chiave del messaggio: " + key); Log.i(TAG, "Controllo se ho già ricevuto il messaggio"); if(messDB.existsMess(key)){ Log.i(TAG, "Destinatario: Il messaggio è già stato ricevuto"); Log.i(TAG, "Destinatario: Informa il mittente di non inviare"); answer = "NO#end"; outStream.write(answer.getBytes(charsetCod)); outStream.flush(); run(device); } else { Log.i(TAG, "Destinatario: Il messaggio non è stato mai ricevuto"); Log.i(TAG, "Destinatario: Informa il mittente di inviare"); answer = "YES#end"; outStream.write(answer.getBytes(charsetCod)); outStream.flush(); Log.i(TAG, "Destinatario: Ricevi la grandezza del messaggio"); inStream.read(sizeRead); String s = new String(sizeRead); int ss = s.indexOf("#end", 0); Log.i(TAG, "indice di #end: " + ss); String sz = s.substring(0, ss); Log.i(TAG, sz); int size = Integer.parseInt(sz); Log.i(TAG, "La grandezza del messaggio è " + size); byte[] messageRead = new byte[size]; Log.i(TAG, "Destinatario: Ricevi il messaggio"); inStream.read(messageRead); message = new String(messageRead); // converte i bytes in String Log.i(TAG, "Ricevuto messaggio dall'inputStream: " + message); Log.i(TAG, "Destinatario: ottengo data e ora di ricezione messaggio"); long receivedTime = System.currentTimeMillis(); DateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss:SSS"); Date dt = new Date(receivedTime); String receivedTimeString = df.format(dt); Log.i(TAG, "Il messaggio è stato ricevuto alle " + receivedTimeString); Log.i(TAG, "Destinatario: Ricevo ora e data di invio messaggio"); inStream.read(timeSent); sentTime = new String(timeSent); int senInd = sentTime.indexOf("#end", 0); String sentTimeSender = sentTime.substring(0, senInd); Log.i(TAG, "Il messaggio è stato inviato il: " + sentTimeSender); Log.i(TAG, "Destinatario: Ricevo gli already received"); int byteRead = inStream.read(alreadyReceived); Log.i(TAG, "sono stati letti " + byteRead + " byte"); String ar = new String(alreadyReceived); Log.i(TAG, ar); int arInd = ar.indexOf("#end", 0); String myAr = ar.substring(0, arInd); Log.i(TAG, myAr); String allReceived = myAr.concat(";mac_recipient"); Log.i(TAG, "AlreadyReceived: " + allReceived); Log.i(TAG, "Destinatario: Informo il mittente che ho ricevuto il messaggio"); String answOk = "OK#end"; outStream.write(answOk.getBytes(charsetCod)); String path = saveMessageAsFile(key, message); Log.i(TAG, "Destinatario: Invio l'intent per mostrare all'utente il messaggio ricevuto"); Intent intent = new Intent(ACTION_MESS_READ); intent.putExtra("key_mess", key); intent.putExtra("messRead", message); intent.putExtra("sender", dev_sender); context.sendBroadcast(intent); Log.i(TAG, "Intent concluso"); addMessageToDb(key, message, dev_sender, dev_recipient, receivedTimeString, sentTime, path, allReceived, size); read(device); } } catch (IOException e) { Log.e(TAG, "Disconnesso!", e); connectionLost(); ManageConnections.this.start(); // riavvia la connessione break; } } } </code></pre> <p>For writing:</p> <pre><code>public void write(final String key, final BluetoothDevice device) { dev_sender = btAdapter.getName(); dev_recipient = device.getName(); mac_sender = btAdapter.getAddress(); mac_recipient = device.getAddress(); final byte[] answerClient = new byte[10]; final byte[] ricevuto = new byte[10]; try { final String keyy = key.concat("#end"); final byte[] keyWrite = keyy.getBytes(charsetCod); outStream.write(keyWrite); // invia la chiave del messaggio outStream.flush(); Log.i(TAG, "Mittente: ho inviato la chiave del messaggio al destinatario, aspetto la risposta.."); try { inStream.read(answerClient); final String answerC = new String(answerClient); Log.i(TAG, answerC); final int ansInd = answerC.indexOf("#end", 0); Log.i(TAG, "indice: " + ansInd); answer = answerC.substring(0, ansInd); Log.i(TAG, "Mittente: la risposta del dispositivo: " + answer); if (answer == "NO") { Log.i(TAG, "Mittente: Il messaggio è già stato ricevuto, non inviare"); aggiornaAlreadyReceived(device.getAddress(), key); } else { Log.i(TAG, "Mittente: Il messaggio non è stato ricevuto, invia.."); messDB = new MessagesDatabase(context); messDB.getWritableDatabase(); final Messaggio m = messDB.getMessage(key); Log.i(TAG, "Mittente: Invio la grandezza del messaggio"); final int size = m.getSize(); Log.i(TAG, "La grandezza è " + size); final String sizeString = String.valueOf(size); final String ss = sizeString.concat("#end"); Log.i(TAG, ss); final byte[] sizeByte = ss.getBytes(charsetCod); outStream.write(sizeByte); outStream.flush(); Log.i(TAG, "Mittente: Invio il messaggio"); final byte[] message = m.getMessage().getBytes(charsetCod); final long sentTime = System.currentTimeMillis(); outStream.write(message); outStream.flush(); Log.i(TAG, "Mittente: Invio data e ora in cui il messaggio è stato mandato"); final DateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss:SSS"); final Date dt = new Date(sentTime); final String sent = df.format(dt); final String sentime = sent.concat("#end"); final byte[] sentTimeByte = sentime.getBytes(charsetCod); outStream.write(sentTimeByte); outStream.flush(); Log.i(TAG, "Mittente: Invio gli already_received"); final String myAlRec = m.getAlreadyReceived(); Log.i(TAG, myAlRec); final String myAlreadyRec = myAlRec.concat("#end"); Log.i(TAG, myAlreadyRec); final byte[] allReceived = myAlreadyRec.getBytes(charsetCod); outStream.write(allReceived); outStream.flush(); Log.i(TAG, "Mittente: Aspetto che il destinatario mi informi dell'arrivo del messaggio"); String ric = ""; inStream.read(ricevuto); final String ricev = new String(ricevuto); Log.i(TAG, "Il destinatario risponde con " + ricev); final int ricInd = ricev.indexOf("#end", 0); ric = ricev.substring(0, ricInd); Log.i(TAG, ric); if(ric == "OK") { Log.i(TAG, "Mittente: Il destinatario ha ricevuto il messaggio"); aggiornaAlreadyReceived(mac_recipient, key); } else Log.i(TAG, "Mittente: Il messaggio non è stato ricevuto"); Log.i(TAG, "Mittente: Invio l'intent per informare l'utente che il messaggio è stato inviato"); final Intent intent = new Intent(ACTION_MESS_WRITE); intent.putExtra("key_mess", key); intent.putExtra("recipient", dev_recipient); intent.putExtra("ric", ric); context.sendBroadcast(intent); Log.i(TAG, "Mittente: Intent concluso"); } } catch (final Exception e) { Log.e(TAG, "Errore"); e.printStackTrace(); } } catch (final IOException e) { Log.e(TAG, "Eccezione durante la scrittura dell'id del messaggio", e); e.printStackTrace(); final Intent intent = new Intent(ACTION_NO_MESSAGE); intent.putExtra("key_mess", key); context.sendBroadcast(intent); } } </code></pre>
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    1. COCan you please comment what changed your mind about the answer of the question? thank you
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      1. USSaro Taşciyan
    2. COI think there are two way to resolve this problem. First, I can use a single call for "sentTime" data and "AlreadyReceived" data. In this way it works fine but I can't understand why this change resolved this problem so I've decided to use ObjectInputStream that is a specialized InputStream and it is able to read generic Java objects and it's more simple to use.
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