Android TCP client

Question

I\'m currently working on a tcp client in Android. I want to connect my android device to a tcp server on my computer and receive the data once every 2 seconds. The problem

Answer 1

You need to paste the exception that you are getting to cause the force close, before anyone can provide decent help.

But some suggestions that might solve the problem.

• Most likely to be the problem, viewText.setText can only be called from the UI thread. There's quite a few ways to handle this. You can use AsyncTask or if you have an Activity reference you can use runOnUIThread and pass in a runnable that calls setText.
• Move checkin = sk.getInputStream(); to before the loop. There's no reason to get the strem every cycle through the loop.
• Do not create the BufferedReader every cycle through the loop. Move it before the loop
• .sleep(2000) does not guarantee exactly 2 seconds.

I'm having some code formatting issues so I apologize.

 private class DownloadFilesTask extends AsyncTask<Void, String, Void> {
     protected Long doInBackground(Void... nothing) {
         try {                    
            sk=new Socket(server,port);
        publishProgress("connected");       
            flag = true;
    } catch (UnknownHostException e) {      
        publishProgress("failed 1 socket");
        flag = false;
    } catch (IOException e) {                   
        publishProgress("failed 2 socket");
        flag = false;
    }

    while (flag == true){               
        try {
            checkin = sk.getInputStream();
            checkint = checkin.available();

            if (checkint > 0){
                try {
                    BufferedReader in = new BufferedReader(new InputStreamReader(sk.getInputStream()));
                    received = in.readLine();
                    publishProgress(received);

                } catch (IOException e) {
                    publishProgress("failed to receive");
                }
            }

        Thread.sleep(2000);
        } catch (IOException e) {
            updateProgress(

        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    return;
 }

 protected void onProgressUpdate(String... progress) {
    viewsurface.setText(progress[0]);
 }

 protected void onPostExecute(Void result) {
     //nothing
 }

 }