Simple udp server for android and get multi messages

Question

I write simple method for udp server:

 private void runUdpServer() {
        String message;
        byte[] lmessage = new byte[MAX_UDP_DATAGRAM_LEN];
        Da         


        

Answer 1

Put the code you have into a loop, and put this loop into its own thread so that it doesn't block the UI thread.

Use runOnUiThread() to update the UI from this new thread.

Example:

private MyDatagramReceiver myDatagramReceiver = null;

protected void onResume() {
    myDatagramReceiver = new MyDatagramReceiver();
    myDatagramReceiver.start();
}

protected void onPause() {
    myDatagramReceiver.kill();
}

private class MyDatagramReceiver extends Thread {
    private boolean bKeepRunning = true;
    private String lastMessage = "";

    public void run() {
        String message;
        byte[] lmessage = new byte[MAX_UDP_DATAGRAM_LEN];
        DatagramPacket packet = new DatagramPacket(lmessage, lmessage.length);

        try {
            DatagramSocket socket = new DatagramSocket(UDP_SERVER_PORT);

            while(bKeepRunning) {
                socket.receive(packet);
                message = new String(lmessage, 0, packet.getLength());
                lastMessage = message;
                runOnUiThread(updateTextMessage);
            }
        } catch (Throwable e) {
            e.printStackTrace();
        }

        if (socket != null) {
            socket.close();
        }
    }

    public void kill() { 
        bKeepRunning = false;
    }

    public String getLastMessage() {
        return lastMessage;
    }
}

private Runnable updateTextMessage = new Runnable() {
    public void run() {
        if (myDatagramReceiver == null) return;
        textMessage.setText(myDatagramReceiver.getLastMessage());
    }
};