android中的文件下载进度条

Question

如何显示剩余的KB文件将在android的进度条中下载。 例如剩下12kb / 120kb ......然后是97kb / 120kb ......等等

我们是否可以拥有此进度对话框，如图像

所示

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);
        }
    }

Answer 2

您所描述的最佳方式是使用AsyncTask执行下载。在onProgressUpdate方法中，您可以更新ProgressDialog以指示用户完成百分比。它看起来像这样：

Answer 3

progressDialog.setMax(fileLength/1000);

publishProgress(String.valueOf(total /1000));

以下代码仅在API 11

之后可用

progressDialog. setProgressNumberFormat ("%1d kb of %2d kb");

Answer 4

查看http://developer.android.com/guide/topics/ui/dialogs.html#ProgressDialog

Answer 5

您可以使用进度对话框，如文档中所述。或者（也许更优雅），您可以在活动的标题栏中使用进度指示器。在您的活动中，在致电setContentView之前，请添加以下行：

requestWindowFeature(Window.FEATURE_PROGRESS);

然后通过拨打setProgress(int)，您可以指出进度。当进度达到10000时，标题栏中的进度指示器将消失。请注意，如果您确定非UI线程的进度，则应使用处理程序来调用setProgress。