Obtainmessage () in handler in Android

Public final Message obtainmessage (int, int arg1, int arg2, Object obj)
Here are the 4 parameters to explain ah ...

byte[] buffer = new byte[1024];
            int bytes;
bytes = mminstream.read (buffer);
Mhandler.obtainmessage (Mainactivity.message_read, Bytes,-1, buffer). Sendtotarget ();

This is the code for the instance.

Case Message_read:

Byte[] Readbuf = (byte[]) msg.obj;//is this a buffer given to READBUF?
           
string ss = new String (readbuf, 0,MSG.ARG1);//What does this sentence mean, it seems that the arg1 is the value read in



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-is the value of your message passed to handler,

Message msg = Handler.obtainmessage ();
MSG.ARG1 = 1;
MSG.ARG2 = 2;
Msg.what = 3;
Msg.obj = Object;

Receive in Handler
Handler Handler = new Handler () {

    @Override
    public void Handlemessage (Message msg) {
        Super.handlemessage (msg);
        Receive messages sent by message  msg.what   msg.arg1  msg.arg2  msg.obj
        Here, msg.obj need to be strong into the data type you passed.
}

};

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Mhandler.obtainmessage (Mainactivity.message_read, Bytes,-1, buffer). Sendtotarget ();

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New String (Readbuf, 0,MSG.ARG1); String (byte[] data, int offset, int byteCount)
MSG.ARG1 acts as a bytecount, which is the character length. MSG.ARG1 is not the assignment of bytes before the message, and bytes = mminstream.read (buffer), which is to give the single character bytes

Obtainmessage () in handler in Android