Answer by sharath kumar for How do I fix 'android.os.NetworkOnMainThreadException'?

The main thread is the UI thread, and you cannot do an operation in the main thread which may block the user interaction. You can solve this in two ways:

Force to do the task in the main thread like this

StrictMode.ThreadPolicy threadPolicy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(threadPolicy);

Or create a simple handler and update the main thread if you want.

Runnable runnable;
Handler newHandler;

newHandler = new Handler();
runnable = new Runnable() {
    @Override
    public void run() {
         try {
            //update UI
        } catch (Exception e) {
            e.printStackTrace();
        } 
    }
};
newHandler.post(runnable);

And to stop the thread use:

newHandler.removeCallbacks(runnable);

For more information check this out: Painless threading