For循环不完全执行我的异步任务
我正在下载所有文件。 我做的是循环，不幸的是我的for循环没有完成我的异步任务它继续做所有的循环，无论它是否完成了第一个正在下载的文件。 请帮忙。
这是我的for循环
for (int i = 0; i < id.length; i++) { Element e = (Element)nodes.item(i); id[i] = ""+CategoriesXMLfunctions.getValue(e, "id"); name[i] = ""+CategoriesXMLfunctions.getValue(e, "name"); image[i] = ""+CategoriesXMLfunctions.getValue(e, "image"); simage[i] = ""+CategoriesXMLfunctions.getValue(e, "simage"); download[i] = ""+CategoriesXMLfunctions.getValue(e, "download"); author[i] = ""+CategoriesXMLfunctions.getValue(e, "author"); genre[i] = ""+CategoriesXMLfunctions.getValue(e, "genre"); size[i] = ""+CategoriesXMLfunctions.getValue(e, "size"); price[i] = ""+CategoriesXMLfunctions.getValue(e, "price"); mylist.add(map); id_all = id[i]; image_all = image[i]; dload_all = download[i]; size_all = size[i]; name_all = name[i]; String response = null; String resstring = null; ArrayList postParameters = new ArrayList(); postParameters.add(new BasicNameValuePair("devid", "devid")); String devid=null; try { devid = URLEncoder.encode(Global.getMac(), "UTF-8"); } catch (UnsupportedEncodingException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } try { String nURL = "http://....url"; response = CustomHttpClient.executeHttpPost(nURL, postParameters); resstring=response.toString(); String credit = resstring; String priiice = price[i]; float money = Float.parseFloat(credit); float pri = Float.parseFloat(priiice); if(pri>money){ final AlertDialog.Builder alert = new AlertDialog.Builder(MainStore.this); alert.setMessage("Credits not enough."); alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { dialog.cancel(); } }); alert.show(); }else{ File sd = getDir("xml",MODE_PRIVATE); File todel = new File(sd,id[i]+".xml"); todel.delete(); String filecreat= "/"+id[i]+".xml"; File newfil = new File(sd+ filecreat); if(newfil.exists()){ todel.delete(); } try{ if(!newfil.exists()){ newfil.createNewFile(); }}catch(IOException e1){ } try{ FileWriter fileWritter = new FileWriter(newfil); BufferedWriter bufferWritter = new BufferedWriter(fileWritter); bufferWritter.write(""); bufferWritter.write(""); bufferWritter.write(""+id[i]+""); bufferWritter.write(""+name[i]+""); bufferWritter.write(""+download[i]+""); bufferWritter.write(""+size[i]+""); bufferWritter.write(""+author[i]+""); bufferWritter.write(""+genre[i]+""); bufferWritter.write("0"); bufferWritter.write(""); bufferWritter.write(""); bufferWritter.close(); Toast.makeText(getApplicationContext(), "Downloading...", Toast.LENGTH_LONG).show(); }catch(IOException e1){ e1.printStackTrace(); Toast.makeText(getApplicationContext(), "error wrting xml "+e1.toString(), Toast.LENGTH_LONG).show(); } downloadallStarted(); downloadallfiles(); //checkdownloadall(); //downloadallFinished(); } }catch (Exception e1){ Toast.makeText(getApplicationContext(), "Error in downloadall: " +e1.toString(), Toast.LENGTH_LONG).show(); } } 这是我的异步任务
private void startDownloadall() { String fileURL = dload_all; fileURL = fileURL.replace(" ", "%20"); new DownloadFileAsync1().execute(fileURL); Toast.makeText(getApplicationContext(), "Downloading...start all", Toast.LENGTH_LONG).show(); } class DownloadFileAsync1 extends AsyncTask { @Override protected void onPreExecute() { super.onPreExecute(); //showDialog(DIALOG_DOWNLOAD_PROGRESS); } @Override protected String doInBackground(String... aurl) { try { String fileURL = dload_all; fileURL = fileURL.replace(" ", "%20"); URL u = new URL(fileURL); HttpURLConnection c = (HttpURLConnection) u.openConnection(); c.setRequestMethod("GET"); c.setDoOutput(true); c.connect(); String PATH = getDir("ebook", MODE_PRIVATE).toString(); String ebookfile = ""; //String filename = id[index]; String filename = id_all; if(fileURL.endsWith("pdf")) ebookfile = filename+".pdf"; else ebookfile = filename+".epub"; bookfile = ebookfile; Global.setBookfile(bookfile); File file = new File(PATH); file.mkdirs(); File outputFile = new File(file, ebookfile); FileOutputStream fos = new FileOutputStream(outputFile); lenghtOfFilee = c.getContentLength(); InputStream in = c.getInputStream(); byte[] buffer = new byte[1024]; int len1 = 0; long total = 0; while ((len1 = in.read(buffer)) > 0) { total += len1; //total = total + len1 //publishProgress("" + (int)((total*100)/lenghtOfFilee)); fos.write(buffer, 0, len1); } fos.close(); } catch (Exception e) { // Log.d("Downloader", e.getMessage()); } return null; } protected void onProgressUpdate(String... progress) { // Log.d("ANDRO_ASYNC",progress[0]); //mProgressDialog.setProgress(Integer.parseInt(progress[0])); } @Override protected void onPostExecute(String unused) { Global.setBookfile(bookfile); Toast.makeText(getApplicationContext(), "Downloading..."+lenghtOfFilee, Toast.LENGTH_LONG).show(); checkdownloadall(); //dismissDialog(DIALOG_DOWNLOAD_PROGRESS); } }
异步任务在后台线程上运行，因此您可以直接访问函数doInBackground（）中的非线程安全的变量dload_all。 也许你可以尝试：
private void startDownloadall() { //String fileURL = dload_all; //fileURL = fileURL.replace(" ", "%20"); new DownloadFileAsync1().execute(dload_all, id_all); Toast.makeText(getApplicationContext(), "Downloading...start all", Toast.LENGTH_LONG).show(); } class DownloadFileAsync1 extends AsyncTask { @Override protected void onPreExecute() { super.onPreExecute(); //showDialog(DIALOG_DOWNLOAD_PROGRESS); } @Override protected String doInBackground(String... aurl) { try { String fileURL = args[0]; fileURL = fileURL.replace(" ", "%20"); URL u = new URL(fileURL); HttpURLConnection c = (HttpURLConnection) u.openConnection(); c.setRequestMethod("GET"); c.setDoOutput(true); c.connect(); String PATH = getDir("ebook", MODE_PRIVATE).toString(); String ebookfile = ""; //String filename = id[index]; String filename = args[1]; if(fileURL.endsWith("pdf")) ebookfile = filename+".pdf"; else ebookfile = filename+".epub"; bookfile = ebookfile; Global.setBookfile(bookfile); File file = new File(PATH); file.mkdirs(); File outputFile = new File(file, ebookfile); FileOutputStream fos = new FileOutputStream(outputFile); lenghtOfFilee = c.getContentLength(); InputStream in = c.getInputStream(); byte[] buffer = new byte[1024]; int len1 = 0; long total = 0; while ((len1 = in.read(buffer)) > 0) { total += len1; //total = total + len1 //publishProgress("" + (int)((total*100)/lenghtOfFilee)); fos.write(buffer, 0, len1); } fos.close(); } catch (Exception e) { // Log.d("Downloader", e.getMessage()); } return null; } protected void onProgressUpdate(String... progress) { // Log.d("ANDRO_ASYNC",progress[0]); //mProgressDialog.setProgress(Integer.parseInt(progress[0])); } @Override protected void onPostExecute(String unused) { Global.setBookfile(bookfile); Toast.makeText(getApplicationContext(), "Downloading..."+lenghtOfFilee, Toast.LENGTH_LONG).show(); checkdownloadall(); //dismissDialog(DIALOG_DOWNLOAD_PROGRESS); } }