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    <p>Use the InputStream "available" method </p> <p><a href="http://developer.android.com/reference/java/io/InputStream.html#available%28%29" rel="nofollow noreferrer" title="InputStream&#39;s available&#40;&#41; method">reference page for InputStream</a></p> <p>to check if there is data in the stream before reading without blocking, and check for the elapsed time between reads to decide if a timeout occurred (System.getCurrentTimeMillis() should do the job).</p> <p>Check this answer for reference and a complete listing:</p> <p><a href="https://stackoverflow.com/questions/10522767/implement-a-timeout-in-bluetoothsocket-inputstream-read-in-android">Implement a timeout in BluetoothSocket inputstream.read() in Android</a></p> <p><strong>EDIT:</strong></p> <p>If I'm correctly reading between lines from your comments, you could really use a Bluetooth UDP socket... </p> <p>Sadly <em>it seems</em> that you can't use datagrams with Bluetooth on Android, therefore you have to stick with TCP.</p> <p>If the data you want to send between devices is event driven (e.g. you want the user on device A to receive a notification as soon as the user on device B touches the screen/fires his weapons/etc) you can still adjust your reading loop to do what you want.</p> <p>All you need is a working thread where to put the loop doing the I/O heavy lifting, and a Handler (create it in the UI thread) that will notify some Listener of your choice as soon as you receive anything.</p> <p>Keep in mind that I'm only guessing your usage scenario, so don't get mislead if asynchronous event-driven communication is not the problem.</p> <p>Hope this helps</p>
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    1. COIf I understand well, in this example, you check if the InputStream has some byte in it, then you start to read it. That causes a problem for me, provided I need to get the answer message very fast I will try this anyway, to see if it works without a timer loop
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    2. COI have expanded my answer a little, still I'm not sure of what the problem is. What do you mean with "I need to get the answer message very fast"? As far as I understand, the speed of the answer you'll receive will mostly depend on how fast your peer is sending it...
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    3. COThe application I am coding is a bit particular. When I write some command with my android device, the other Bluetooth device (which is not Android at all) sends an answer. I need to get this answer really fast, thats why I will try to minimize the `Thread.sleep(someTime);` in the loop. After reflexion, if the time to sleep is really short (maybe 5 millis), this shouldn't slow the app too much. Thanks for your complete answer
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