Android AsyncTask called from fragment none of its members called - doInbackground, onpreexecute, onpostexecute

Question

I am trying to read a uri which returns either a 0 or -1. The asynctask is called from inside a Fragment. Basically, its a login when the user clicks a button the inputs are checked on the remote server.

In the debugger the task shows as RUNNING but never completes, also none of the overridden member are called, which may explain why it does nothing.

The Login Code is :

// Validate the user.
    String uri = HLConsts.SERV_URI + "ValidateLoginUser?uname=" + szUserName + "&password=" + szPassword + "&android=1";
    ReadUri rd = new ReadUri(uri);
    int cnt =0;
    rd.execute();
    while ( rd.getSzReturn() == null  || cnt > 5) {
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        cnt++;
    }
    if(cnt > 5) {
        errors++;
    }

    String szValid = rd.getSzReturn();

        Snackbar.make(root, "Name = " + szUserName + " Pass = " + szPassword , Snackbar.LENGTH_LONG)
            .setAction("Action", null).show();

============================ The Async Task is :

public class ReadUri  extends AsyncTask< Void , Void, String> {
 //   private Context mContext;
    private String mUrl;
    private String szReturn = null;



    public String getSzReturn() {
        return szReturn;
    }

    public ReadUri(  String url) {
      //  mContext = context;
        mUrl = url;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();


     //   dynamictext = (TextView)   myView.findViewById(R.id.textview_first);
    }

    @Override
    protected String doInBackground(Void... params) {
        String resultString = null;
        resultString = getString(mUrl);

        return resultString;
    }

    @Override
    protected void onPostExecute(String strings) {
        super.onPostExecute(strings);
        szReturn =strings;
    }


    //======================================================================================
    private String getString(String InUrl) {

        String ret = "Nothing";


        URL url = null;
        try {
            url = new URL(InUrl);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }


        HttpURLConnection httpURLConnection = null;
        try {
            httpURLConnection = (HttpURLConnection) url.openConnection();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // The line below is where the exception is called
        int response = 0;
        try {
            response = httpURLConnection.getResponseCode();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Log.i("Response", String.valueOf(response));

        if (response == HttpURLConnection.HTTP_OK) {
            // Response successful
            InputStream inputStream = null;
            try {
                inputStream = httpURLConnection.getInputStream();
            } catch (IOException ex) {
                ex.printStackTrace();
            }

            // Parse it line by line
            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(inputStream));
            String line;
            StringBuffer sb = new StringBuffer();
            while (true) {
                try {
                    //             if (!((temp = bufferedReader.readLine()) != null)) {
                    while((line=bufferedReader.readLine())!=null)
                    {
                        //   sb.append(line);      //appends line to string buffer
                        //   sb.append("\n");     //line feed
                        ret += line;
                        Log.w("MyApp",line);
                    }
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
                // Parsing of data here

            }
        } else {
            Log.e("SAMES", "INCORRECT RETURN CODE: " + response);
        }

        httpURLConnection.disconnect();

        //  urlConnection.disconnect();
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return ret;
    }
}

Please would you help. I have set breakpoints and none of them are triggered and doInBackground is never called.

Thanks Jeff.

`rd.execute();` Remove all code lines after that statement. Handle the result in onPostExecute. — blackapps, Nov 10 '20 at 13:25
`|| cnt > 5)` I think you ment `|| cnt < 5)`. But anyhow that was bad coding. Follow my first comment. — blackapps, Nov 10 '20 at 13:28

score 0 · Accepted Answer · answered Nov 11 '20 at 11:47

0

This was fixed by not using an external class to run the asynctask.

The example is below : AsyncTask Android example

answered Nov 11 '20 at 11:47

Jeff Baker

1
1
5

Android AsyncTask called from fragment none of its members called - doInbackground, onpreexecute, onpostexecute

In the debugger the task shows as RUNNING but never completes, also none of the overridden member are called, which may explain why it does nothing.

1 Answers1