如何在Android

Question

我希望我的应用程序下载tar.tgz文件，然后在应用程序包中提取它：

  

/数据/数据/包

下载成功完成，但我无法解压缩tar文件。我使用AsyncTask的doInBackground（）方法下载tar文件，使用PostExecute（）方法来提取它。我的代码是：

class InstallPython extends AsyncTask< String, String, String > 
    {
        @Override
        protected String doInBackground( String... f_url )
        {
            int count = 0;
            byte data[] = new byte[ 15317957 ];

            try
            {
                //Create the URL object url for the Python binary URL.
                URL url = new URL( f_url[ 0 ] );

                //Create the URLConnection object connection for the previous URL object.
                URLConnection conection = url.openConnection();
                conection.connect();

                //Create the InputStream object input for reading from url object.
                InputStream input = new BufferedInputStream( url.openStream(), 15317957 ); 

                //Create the OutputStream object output for writing.
                OutputStream output = new FileOutputStream( "/data/data/com.rg.rgnettools/python.tar.tgz" );

                //Read from url object and write in the new file.
                while ( ( count = input.read( data ) ) != -1 )
                {                    
                    output.write( data, 0, count );
                }

                //Close file descriptors.
                output.flush(); 
                output.close();
                input.close();
            } 
            catch ( Exception e )
            {
                Log.e( "Download-Python-Error: ", e.getMessage() );
            }
            return null;
        }

        @Override 
        protected void onPostExecute( String file_url )
        {
            try 
            {
                Runtime.getRuntime().exec( new String[]{ "su", "-c", "tar -xzf /data/data/com.rg.rgnettools/python.tar.tgz" } );                
            }
            catch ( Exception e )
            {
                Log.e( "SPLASHSCREENACTIVITY_ERROR", e.getMessage() );
            }           

        }
    }