Why error in the line (progress bar)

Question

public class NewThread extends AsyncTask<String, Void, String> { @Override protected String doInBackground(String... arg) { Document doc; try { doc = Jsoup.connect("https://сайт").maxBodySize(0).get(); content = doc.select("елемент"); titleList.clear(); progressBar = (ProgressBar) findViewById(R.id.progressBar); for (Element contents : content) { titleList.add(contents.text()); progress = progress + 10; progressBar.setProgress(progress); } } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(String result) { lv.setAdapter(adapter); }

Accepted Answer · 2018-10-11T03:31:19

The doInBackground method doInBackground not have access to the UI stream. in order to pass values to a UI stream, you need to use the publishProgress() method, which passes the values to onProgressUpdate() , which already has access to the UI stream.

 public class NewThread extends AsyncTask<String, Integer, String> { @Override protected String doInBackground(String... arg) { Document doc; try { doc = Jsoup.connect("https://сайт").maxBodySize(0).get(); content = doc.select("елемент"); titleList.clear(); for (Element contents : content) { titleList.add(contents.text()); progress = progress + 10; publishProgress(progress); } } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onProgressUpdate(Integer... values) { super.onProgressUpdate(values); progressBar = (ProgressBar) findViewById(R.id.progressBar); progressBar.setProgress(values[0]); } @Override protected void onPostExecute(String result) { lv.setAdapter(adapter); }

I can't use the publishProgress () method, I swap it with the doInBackground and get even more errors. (You can write an example of how to embed it in my code)

Why error in the line (progress bar)

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