Question

我尝试通过AsyncTask设置进度条。但我有一点问题。

我的代码在这里;

'[["a", 1], ["b", 2], ["c", 3]]'

Android工作室说：必须从UI线程调用方法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 BaÅŸlangÄ±Ã§ { mNotifyManager.cancel(2219); //scheduleNotificationWithResumeButton(); Devam button } } }。

这一行setProgress

有可能吗？，你对此有任何想法吗？

谢谢！

Answer 1

您致电PublishProgress

这将触发对AsyncTask中的onProgressUpdate方法的调用

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

在此方法中进行UI操作

Answer 2

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

你可以用这个

必须从UI线程调用方法setProgress？

2 个答案: