I think you have problem in FileProvider, check below link it will help.. NullPointerException: 'Attempt to invoke virtual method 'android. XmlResourceParser android. PackageManager, java. String ' on a null object reference' how to resolve this ,.
Xamarin Study. Android , Xamarin. Step 1: Create Xamarin. Forms Project in Visual Studio Step 4: Add Storage permission into manifest file in android project. Step 6 : Implement interface into Android Project. Before implement interface into android we need add FileProvider ,.
So create xml Folder into Resource folder,. Specify fileprovider into manifest file. FileProvider ". Let's implement interface for open local image and pdf file,. Create class OpenFiles. Current , "com. ActionView ; intent. SetFlags ActivityFlags. GetMimeTypeFromExtension extension. This article discusses the features and restrictions of the iOS file system, and includes a sample application that demonstrates how to use Xamarin. NET System.
IO classes for file system operations on iOS. The following code snippets illustrate some common file operations. This code enumerates the subdirectories in the current directory specified by the ". Your output will be a list of all the files and folders that are deployed with your application displayed in the console window while you are debugging.
To read a text file, you only need a single line of code. This example will display the contents of a text file in the Application Output window. Although working with the complete System. Xml namespace is beyond the scope of this article, you can easily deserialize an XML document from the file system by using a StreamReader like this code snippet:.
For more information, see the documentation for System. Xml and serialization. See the Xamarin. This sample shows how to use the Environment class to access the Documents folder where we can create files and directories.
For more information see the System. IO API reference. Finally, create an instance of the Account class, serialize it to json data and write it to a file:. For more information about working with json data in a. NET application, see Json. NET's documentation. Despite the similarities between Xamarin. NET in some important ways. In order to include a file in the assembly, you must mark it with a special build action, called Content.
This could be confusing for. If your filename casing differs between the file itself and the references to it in code, your code might still work in the simulator but it will fail on a real device. Combine method, which adjusts for the current platform, rather than hardcode a particular path separator. This is a simple step that makes your code more portable to other platforms. This restriction is known as the Application Sandbox.
In terms of the file system, your application is limited to creating and deleting files and directories in its home directory. The home directory is a unique location in the file system where your application and all its data are stored. You cannot choose or change the location of the home directory for your application; however iOS and Xamarin.
The Application Bundle is the folder that contains your application. It is distinguished from other folders by having the. Your application bundle contains your executable file and all the content files, images, etc. When you browse to your application bundle in Mac OS, it appears with a different icon than you see in other directories and the.
To view the application bundle for the sample code, right-click on the project in Visual Studio for Mac and select Reveal in Finder. Right-click on this icon and choose Show Package Contents to browse the contents of the Application Bundle directory.
The contents appear just like the contents of a regular directory, as shown here:. When your application is installed on a device, the operating system creates a home directory for your application, and creates a number of directories within the application root directory that are available for use. Since iOS 8, the user-accessible directories are NOT located within the application root, so you can't derive the paths for the application bundle from the user directories, or vice versa.
Since this is clearly not useful outside of your local test environment and hence not portable code anyway , why not just create a "localhost" symlink in the root of your machine? For simplicity, why not bundle your movie file into the app or host it on something like dropbox?
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Learn more. Asked 9 years, 11 months ago. Active 9 years, 11 months ago. Viewed times. So, my code is as below. I think the problem is this part.
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