I have a Bluetooth application based on BluetoothChat. In fact, I've
seen the same issue running that application as a test.
The app communicates with another Bluetooth device (not Android). That
device doesn't always send all the data in one chunk to Android
(although supposedly it does to other Bluetooth phones...like
Blackberry).
Sometimes the data comes over as one byte, followed by 9, followed by
the final 9. I never see this when talking Android phone to Android
phone, just Android phone to this device.
Looking at the BluetoothChat application, there is no checking to see
if the stream is complete. It just has a run that stays alive putting
data into a buffer then sends that buffer to a Handler. Here is the
exact code:
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;
}
}
}
Since the buffer never gets cleared, I would think that longer
messages that come before shorter ones would show partly in the
buffer. Also, there is no check to see if all of the data has been
transmitted (doesn't read return a -1 when the end of the stream is
hit and shouldn't that be checked?).
Just curious if others have run into similar issues on Android and how
they got around it.
BTW, there is a BIG difference in Bluetooth connection ability between
Android phones. I have one phone almost never connects while other
phones do almost always.
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