Android片段从AsyncTask onPostExecute更新TextView

Question

I have an AsyncTask that uses HttpGet to fetch content from a remote server. I have tested and this is working fine, now I want to update a TextView with the result of this AsyncTask. Here is what I have done.

From the OnCreateView of the Fragment, I get reference to a Button and a TextView, I initially hide the TextView and then in the OnClickListener for the button I want to unhide the textview and update that textview with the result of my AsyncTask

 View rootView = inflater.inflate(R.layout.fragment_programs_list, container, false);
        Button btnLoadPrograms = (Button) rootView.findViewById(R.id.btnLoadPrograms);
        TextView tvShowPrograms = (TextView) rootView.findViewById(R.id.tvRestCall);
        tvShowPrograms.setVisibility(View.GONE);

        btnLoadPrograms.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                startNewAsyncTask();    

            }
        });

        return rootView;

Now in the onPostExecute of the AsyncTask, I want to update the Textview

@Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            getView().findViewById(R.id.tvRestCall).setVisibility(View.SHOW); //Does not exit
        }

How do I get a reference to the TextView from within the AsyncTask in a Fragment and then update that TextView with the result of the doinbackground.

Answer 1

尝试使用getView().findViewById(R.id.tvRestCall).setVisibility(View.VISIBLE);

Answer 2

Try this way,

    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        tvShowPrograms.setVisibility(View.VISIBLE); 
    }

Answer 3

我同意https://stackoverflow.com/users/1113949/ksarmalkar-您可以发送对AsyncTask的引用，然后使用该引用通过mYourView.setVisibility(View.VISIBLE);设置可见性mYourView.setVisibility(View.VISIBLE);

Answer 4

I ended up solving the issue as follows Set a public property for the textView

public TextView tvShowPrograms;

Then in OnCreateView I initialize the TextView and set the text to null

tvShowPrograms = (TextView) rootView.findViewById(R.id.tvRestCall);
        tvShowPrograms.setText("");

And then the onPostExecute, I simply set the textView to the result.

@Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            tvShowPrograms.setText(result);
        }

Thanks for the answers, I am glad it is working