Before a client app tries to work with a file for which it has a content URI, the app can request information about the file from the server app, including the file's data type and file size. The data type helps the client app to determine if it can handle the file, and the file size helps the client app set up buffering and caching for the file.
As an installable mobile application (using Android Package or APK files). Be generated and placed in the Web Files section on the mobile Web server. Apr 2, 2013 - Using Async task. (if not work in 4.0 then add StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();.
This lesson demonstrates how to query the server app's FileProvider to retrieve a file's MIME type and size.
Retrieve a file's MIME type
A file's data type indicates to the client app how it should handle the file's contents. To get the data type of a shared file given its content URI, the client app calls ContentResolver.getType(). This method returns the file's MIME type. By default, a FileProvider determines the file's MIME type from its filename extension.
The following code snippet demonstrates how a client app retrieves the MIME type of a file once the server app has returned the content URI to the client:
Retrieve a file's name and size
The FileProvider class has a default implementation of the query() method that returns the name and size of the file associated with a content URI in a Cursor. The default implementation returns two columns:
DISPLAY_NAME- The file's name, as a
String. This value is the same as the value returned byFile.getName(). SIZE- The size of the file in bytes, as a
longThis value is the same as the value returned byFile.length()
The client app can get both the DISPLAY_NAME and SIZE for a file by setting all of the arguments of query() to null except for the content URI. For example, this code snippet retrieves a file's DISPLAY_NAME and SIZE and displays each one in separate TextView:
Kotlin
Java
For additional related information, refer to:
File Transfer Protocol (FTP) is a standard network protocol used to transfer files from one host to another host over a TCP-based network, such as the Internet. It is often used to upload web pages and other documents from a private development machine to a public web-hosting server. FTP is built on a client-server architecture and uses separate control and data connections between the client and the server.FTPClient encapsulates all the functionality necessary to store and retrieve files from an FTP server. This class takes care of all low level details of interacting with an FTP server and provides a convenient higher level interface.
You must first connect to the server with connect before doing anything, and finally disconnect after you're completely finished interacting with the server. Then you need to check the FTP reply code to see if the connection was successful. Here is an example that downloads files from a specific directory on the FTP server and then delete them.
Download File Manager
Please download the jar file from the Apache commons Website given below and add to your project Java build path.
http://commons.apache.org/net/download_net.cgi
Access Android Files From Pc
Source for the properties file ftp.properties
