Improve transfer speed by buffering the reads and writes (in
pre-allocated fixed sized arrays) and DON'T allocate a new byte buffer in
the middle of your while loop...
On Tuesday, June 7, 2016 at 3:18:13 AM UTC+10, Devin Chen wrote:
>
>
> I am trying to increase the transfer speed on android bluetooth. I
> experimented transferring a 2.7MB buffer from one android device to another
> using RFComm socket of the Bluetooth API (see code below). It took ~70 secs
> to complete. I compared this method against the "Share" via bluetooth
> function that came with the phone. The "Share" function gave exceptionally
> better performance (~15 secs to transfer a 2.7MB file).
>
> How does the "Share" function differ from using the Bluetooth API? How can
> I replicate the "Share" method to get optimized transfer speed?
>
> Thanks,
>
> Bluetooth API test code:
>
> Server side - installed on one android device
>
>
> Thanks,
>
> Bluetooth API test code:
>
>
> Server side - installed on one android device
>
>
> BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
> mServerSocket =
> mBluetoothAdapter.listenUsingRfcommWithServiceRecord("DeviceName", MY_UUID);
> socket = mServerSocket.accept();
> mInStream = socket.getInputStream();int totalByte = 1;while (totalByte <
> 2718720) {
> int bytesAvailable = mInStream.available();
> if (bytesAvailable > 0) {
> totalByte += bytesAvailable;
> byte[] buffer = new byte[bytesAvailable];
> mInStream.read(buffer);
> }}
>
> Client side - installed on other android device
>
>
> mClientSocket = device.createInsecureRfcommSocketToServiceRecord(
> MY_UUID);
> mClientSocket.connect();
> mOutStream = mClientSocket.getOutputStream();byte byteValue = 0;for (int i=0;
> i<2718720; i++) {
> byteValue++;
> mOutStream.write(byteValue);}
>
>
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