Android sends audio file via Bluetooth using BluetoothChat example

Question

I am trying to send an audio file via Bluetooth using a sample bluetooth code.

I created a class that converts audio to bytes and vice versa.

Here are the modifications I made in the sample code

private void sendMessage(String message) {
    // Check that we're actually connected before trying anything
    if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
        Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show();
        return;
    }

    // Check that there actually something to send
    if (message.length() > 0) {
        // Get the message bytes and tell the BluetoothChatService to write

        byte[] send = message.getBytes();

        //Convert noti.mp3 into byte array (noti.mp3 is an audio file I am using for testing)
        try{send = Converter.convertAudioToBytes(path+"noti.mp3");}
        catch(Exception e){Logger.append("Error while converting audio into bytes", e);}

        mChatService.write(send);

        // Reset out string buffer to zero and clear the edit text field
        mOutStringBuffer.setLength(0);
        mOutEditText.setText(mOutStringBuffer);
    }
}

I also add a few bytes at the end of the audio to identify the endOfFile on the receiving side.

In the front end, I updated mHandler

//List to store bytes received from the other device 
private List<Byte> list = new ArrayList<Byte>();


case Constants.MESSAGE_READ:
    byte[] readBuf = (byte[]) msg.obj;

    //Status for end of data
    boolean endOfData = false;

    //Add bytes to the Array list
    for(int i=0;i<msg.arg1;i++){list.add(readBuf[i]);}

    // construct a string from the valid bytes in the buffer
    String readMessage = new String(readBuf, 0, msg.arg1);
    mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage);

    //Check if the received message contains this string
    //Also check if the length of the data is less than 990
    if(readMessage.contains("END OF AUDIO FILE") && msg.arg1<990){
        endOfData = true;
    }

    //Check if all the data has been received 
    if(endOfData)
    {
        try{
            Converter.convertBytesToAudio(list,path);
            mConversationArrayAdapter.add(mConnectedDeviceName + ": Audio saved!");
        }
        catch(Exception e){
            Logger.append("Error while converting bytes to audio", e);
        }
        finally{
            list.clear();
        }
    }
    break;

This code works great for small audio files, but when I send a file larger than 3 KB, it receives data incorrectly and does not transmit it to audio.

I tried to send a long text like this

String str = "Message number ";
for(int i=0;i<1000;i++){message += str+i+" ,\n";}
byte[] send = message.getBytes();
mChatService.write(send);

on the receiving side, which I noticed, the received messages are not synchronized.

- Bluetooth. - WhatsApp, Bluetooth.

.

:( ,