Question

我正在创建目录并将下载的文件保存在位于SD卡中的文件夹中，但由于安全问题，我想在应用程序所在的位置创建文件夹，我该怎么办？

class DownloadFileFromURL extends AsyncTask<String, String, String> 
{

    /**
     * Before starting background thread
     * Show Progress Bar Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        showDialog(progress_bar_type);
    }

    /**
     * Downloading file in background thread
     * */
    @Override
    protected String doInBackground(String... f_url) {
        int count;
        try {
            URL url = new URL(f_url[0]);
            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);

            File file = new File(Environment.getExternalStorageDirectory() + 
            "/download2/");
            if (!file.exists()) {
                file.mkdir();
            }

            File outputFile = new File(file, "CabApp.apk");

            OutputStream output = new FileOutputStream(outputFile);

            byte data[] = new byte[1024];

            long total = 0;

            while ((count = input.read(data)) != -1) {
                total += count;
                // publishing the progress....
                // After this onProgressUpdate will be called
                publishProgress(""+(int)((total*100)/lenghtOfFile));

                // writing data to file
                output.write(data, 0, count);
            }

            // flushing output
            output.flush();

            // closing streams
            output.close();
            input.close();

        } catch (Exception e) {
            Log.e("Error: ", e.getMessage());
        }

        return null;
    }

    /**
     * Updating progress bar
     * */
    protected void onProgressUpdate(String... progress) {
        // setting progress percentage
        pDialog.setProgress(Integer.parseInt(progress[0]));
    }

    /**
     * After completing background task
     * Dismiss the progress dialog
     * **/
    @Override
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after the file was downloaded
        dismissDialog(progress_bar_type);



        Intent intent = new Intent(Intent.ACTION_VIEW);
        File file2 = new File(Environment.getExternalStorageDirectory() +  
        "/download2/");
        intent.setDataAndType(Uri.fromFile(new 
                File(Environment.getExternalStorageDirectory() + "/download2/" + "CabApp.apk")), 
        "application/vnd.android.package-archive");
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);

        file2.delete();
    }
}

Answer 1

检查内部存储@

http://developer.android.com/guide/topics/data/data-storage.html#filesInternal

上面的链接中还有一个例子

引用文档

默认情况下，保存到内部存储的文件对您来说是私有的应用程序和其他应用程序无法访问它们（也不能用户）。当用户卸载您的应用程序时，这些文件是除去。

如何在应用程序根目录中创建目录

1 个答案: