Android bluetooth read string - android-bluetooth

Question

Currently my android bluetooth device receive character one by one. Is it possible for me to receive one shot together without one by one ? Thanks for advice.
For example incoming data:
abcd but incoming one by 1 like a b c d
how to make it like:
abcd incoming abcd straight away.
I need to change this line code?
message = txtReceived.getText().toString() + (char)data;}
This is my current code.
btnSend.setOnClickListener(this);
int delay = 1000; // delay in ms
int period = 100; // repeat in ms
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask()
{
public void run()
{
if (flag)
{
final byte data = read();
readMessageHandler.post(new Runnable()
{
public void run()
{
String message;
if (data != 1){
/* if(txtReceived.getText().toString().equals("ON") || txtReceived.getText().toString().equals("OFF"))
{
txtReceived.setText("");
}*/
message = txtReceived.getText().toString() + (char)data;}
else{
message = "";}
txtReceived.setText(message);
}
});
}
}
}, delay, period);
private byte read()
{
byte dataRead = 0;
try
{
dataRead = (byte) inputStream.read();
}
catch(IOException readException)
{
toastText = "Failed to read from input stream: " + readException.getMessage();
Toast.makeText(Blood_Pressure.this, toastText, Toast.LENGTH_SHORT).show();
}
return dataRead;
}

Answer 1

The problem is that inputstream.read returns only one byte of data, hence, you are reading byte-by-byte.
You can send the size of message before the message and then send the message.
You can modify the code to something like this.
{
...
// assuming size is within the range of integer
byte[] sizeOfIncomingData = new byte[4];
inputStream.read(sizeOfIncomingdata, 0, 4);
int size = getIntFromByteArray(sizeOfIncomingData);
byte[] dataBuffer = new byte[size];
inputStream.read(dataBuffer, 0, size);
String message = new String(dataBuffer, "UTF-8");
}
private int getIntFromByteArray(byte[] bytes)
{
return (bytes[0] & 0xFF) << 24 | (bytes[1] & 0xFF) << 16 | (bytes[2] & 0xFF) << 8 | (bytes[3] & 0xFF);
}