方法 setProgress 必须从 UI 线程调用？

Question

我正在尝试通过 AsyncTask 设置进度条。但我有一个小问题。

我的代码在这里；

    public  class DownloadFileFromURL extends AsyncTask<String, String, String> {


    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        mBuilder.setProgress(100, 0, false);
        mNotifyManager.notify(id, mBuilder.build());
    }


    @Override
    protected String doInBackground(String... f_url) {


        try {
            //CreateDownloadTransactionInPanel(1);
            long total = 0;
            URL url = new URL(f_url[0]);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            if(file.exists()){
                //6829809
                deneme = file.length();
                connection.setRequestProperty("Range", "bytes="+(file.length())+"-"); // indirmemiÅŸse atamaz

            }

            connection.connect();
            RandomAccessFile output = new RandomAccessFile(file,"rw");
            BufferedInputStream input = new BufferedInputStream(connection.getInputStream());

            if (file.length() > 0) {
                output.seek(deneme);
                total=deneme;

            }

            byte data[] = new byte[4096];
            int lastcount = 0;


            while ((count = input.read(data,0,4096)) != -1) {

                if (isCanceled) {
                    downloadresult = false;
                    break;
                }

                if (intCheck()) {
                    total += count;
                    downloadresult = true;
                    ProgBarCount = (int) ((total * 100) / lenghtOfFile);
                    if (ProgBarCount > lastcount) {
                        lastcount = ProgBarCount;
                        publishProgress(Integer.toString(ProgBarCount));
                        pBar.setProgress(ProgBarCount);

                    }
                    output.write(data, 0, count);
                }
                else {
                    downloadresult = false;
                    break;
                }


            } //--While Son--

            output.close();
            input.close();
        }

        catch (Exception e) {
            e.printStackTrace();
            exmessage = e.getMessage().toString();
            downloadresult = false;
        }
        return null;
    } // doinBackSON


    /**
     * Updating progress bar
     */
    protected void onProgressUpdate(String... progress) {
        // setting progress percentage

        mBuilder.setProgress(100, Integer.parseInt(progress[0]), false);
        mBuilder.setContentText("Şuan İşlemde : %" + Integer.parseInt(progress[0]) + "");
        mNotifyManager.notify(id, mBuilder.build());
        super.onProgressUpdate(progress);

    }

    @Override
    protected void onPostExecute(String downloadpath) {

        if (exmessage != null) {
            Toast.makeText(getApplicationContext(),"hata:"+exmessage, Toast.LENGTH_SHORT).show();
        }

        if (downloadresult == true) {

            if (file.exists() && lenghtOfFile == (int) file.length()) {

                Toast.makeText(DownloadActivity.this, "DOSYA INDIRILDI VE YUKLEMEYE HAZIR", Toast.LENGTH_SHORT).show();

            } else {

                Toast.makeText(getApplicationContext(), "DOSYA YOK YADA EKSIK INDIRILDI", Toast.LENGTH_SHORT).show();
            }
            CreateDownloadTransactionInPanel(2);
            scheduleNotificationWithTickButton(); // Tick Button
            RedirectRebootActivity(); // Burda hata olabilir


        } //--True Son


        else // False Başlangıç

        {
            mNotifyManager.cancel(2219);

            //scheduleNotificationWithResumeButton(); Devam button

        }

    }


}

Android studio 说：setProgress 方法必须从 UI 线程调用。

这一行pBar.setProgress(ProgBarCount);

有可能吗？ , 你对此有任何想法吗？

谢谢！

Answer 1

你拨打PublishProgress

这会触发对 AsyncTask 中的 onProgressUpdate 方法的调用

@Override
protected void onProgressUpdate(Integer... progress) {
     setProgressPercent(progress[0]);
 }

用这个方法进行 UI 操作

Answer 2

@Overide
protected void onProgressUpdate(Integer... progress) {
     setProgressPercent(progress[0]);
 }

你可以用这个