android - android中的文件下载进度条

Question

如何在android中的进度条中显示剩余KB的文件下载。例如剩余 12kb/120kb..然后 97kb/120kb...等等

我们能否拥有如图所示的进度对话框

Answer 1

class DownloadFileAsync extends AsyncTask<String, String, String> {
        private ProgressDialog mProgressDialog;
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(UrlTestActivity.this);
            mProgressDialog.setMessage("Downloading file..");
            mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            mProgressDialog.setCancelable(false);
            mProgressDialog.show();
        }

        @Override
        protected String doInBackground(String... aurl) {
            int count;
            try {

                for (int i = 0; i < 3; i++) {
                    URL url = new URL("http://nodeload.github.com/nexes/Android-File-Manager/zipball/master");
                    URLConnection conexion = url.openConnection();
                    conexion.connect();
                    int lenghtOfFile = conexion.getContentLength();
                    InputStream is = url.openStream();
                    File testDirectory = new File(Environment.getExternalStorageDirectory() + "/Folder");
                    if (!testDirectory.exists()) {
                        testDirectory.mkdir();
                    }
                    FileOutputStream fos = new FileOutputStream(testDirectory+ "/"+(i+100)+".zip");
                    byte data[] = new byte[1024];
                    long total = 0;
                    int progress = 0;
                    while ((count = is.read(data)) != -1) {
                        total += count;
                        int progress_temp = (int) total * 100 / lenghtOfFile;
                        publishProgress(""+ progress_temp);
                        if (progress_temp % 10 == 0 && progress != progress_temp) {
                            progress = progress_temp;
                        }
                        fos.write(data, 0, count);
                    }
                    is.close();
                    fos.close();
                }
            } catch (Exception e) {}
            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) {
            dismissDialog(DIALOG_DOWNLOAD_PROGRESS);
        }
    }