Handler postDelayed not able to update UI

Question

Hello guys I'm trying to update the UI after a short delay and for this I'm using handler's postdelayed method. The following code initially sets my textview text to "Processing" and the code that's included in the the handler's runnable gets executed but doesn't update the UI? Please note that this is done in a Fragment

TextView progressText=(TextView)parent.findViewById(R.id.inProgressText);
progressText.setText("Processing");

getActivity().getMainLooper()).postDelayed(new Runnable() {
    @Override
    public void run() {
        TextView progressText=(TextView)parent.findViewById(R.id.inProgressText);
        progressText.setText("Request completed");              
    }
}, 3000);

Thanks for your help

Answer 1

Change

getActivity().getMainLooper()).postDelayed(new Runnable()

to:

final Handler handler = new Handler();

Then

handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        final TextView progressText=(TextView)findViewById(R.id.inProgressText);
        progressText.setText("Request completed");              
    }
}, 3000);