Java-无法在后台的while循环中发布异步任务的进度-Android

概述我想从doInBackground更新对话框的下载进度.我正在打印日志以及发布进度.他们俩都没有工作.最后更新对话框,并一次打印所有日志值privateclassDownloadEReportextendsAsyncTask<String,Void,Void>{intprogress=0;protectedvoidonPreExecute(){

我想从doInBackground更新对话框的下载进度.
我正在打印日志以及发布进度.
他们俩都没有工作.

最后更新对话框,并一次打印所有日志值

private class DownloadEReport extends AsyncTask<String, VoID, VoID> {    int progress = 0;    protected voID onPreExecute() {        mProgressDialog = new ProgressDialog(EReport.this);        mProgressDialog.setTitle("Downloads");        mProgressDialog.setMessage("Downloading, Please Wait!");        mProgressDialog.setIndeterminate(false);        mProgressDialog.setMax(100);        mProgressDialog.setProgressstyle(ProgressDialog.STYLE_HORIZONTAL);        mProgressDialog.setCancelable(false);        mProgressDialog.show();    }    @OverrIDe    protected voID onProgressUpdate(VoID... values) {        super.onProgressUpdate(values);        mProgressDialog.setProgress(progress);    }    @OverrIDe    protected VoID doInBackground(String... strings) {        String mUrl = strings[0];        String Json = "";        int count;        try {            URL url = new URL(mUrl);            URLConnection conection = url.openConnection();            conection.connect();            // getting file length            int lenghtOffile = conection.getContentLength();            // input stream to read file - with 8k buffer            inputStream input = new BufferedinputStream(url.openStream(), 8192);            // Output stream to write file            OutputStream output = new fileOutputStream("/sdcard/downloadedfile.txt");            byte data[] = new byte[1024];            long total = 0;            while ((count = input.read(data)) != -1) {                total += count;                // writing data to file                output.write(data, 0, count);                // publishing the progress....                // After this onProgressUpdate will be called                Log.e("JsON Download Progress", "" + (int) ((total * 100) / lenghtOffile));                progress = (int) (total * 100 / lenghtOffile);                publishProgress();            }            // flushing output            output.flush();            // closing streams            output.close();            input.close();        } catch (Exception e) {            Log.e("Error: ", e.getMessage());        }        return null;    }    @OverrIDe    protected voID onPostExecute(VoID aVoID) {        super.onPostExecute(aVoID);        mProgressDialog.dismiss();    }}

解决方法:

从onProgressUpdate移除super,然后尝试

@OverrIDeprotected voID onProgressUpdate(VoID... values) {    //super.onProgressUpdate(values);    mProgressDialog.setProgress(progress);}

如果不起作用,则可以在循环中添加sleep语句,以便该循环释放处理器并留出时间发布进度

try {    Thread.sleep(200);} catch (InterruptedException e) {    e.printstacktrace();}

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