Projects can now optionally place code that uses types from Mono. Android in a nullable context to take advantage of additional compiler nullability checks. For example, to enable nullability checks for all code in a project, set the Nullable MSBuild property to enable in the.
When this property set, the build will emit warnings if any code does not properly account for possible null values passed into or returned from APIs in the Mono. Android assembly. See the nullable reference types documentation for more information.
The majority of Mono. Android, including the nullability annotations, is automatically generated from the Android Java source. The annotations intentionally preserve any upstream bugs in the nullability information provided by the Android source code. Object contains several properties and methods that are required to be public to support Xamarin. Android Java bindings but are not intended to be used in hand-written code.
These members are now hidden from IntelliSense, making it easier to find the useful members. Android bindings projects now support binding Java methods that have any number of parameters instead of the previous limit of This provides additional flexibility to define custom C enumerations that are visible to the bindings generation process and do not correspond to any Java type in the bound Java library.
For enumerations that do correspond to Java types, project authors should continue to include the jni-interface and jni-name attributes as before. In general, this environment does not need to be adjusted, but in certain special scenarios, having the option to customize the JDK path via an environment variable might provide useful flexibility.
Projects that have Dex compiler set to dx in the Visual Studio project property pages will now get a build warning:.
To resolve this warning, set the Dex compiler in the Visual Studio project property pages to d8 or edit the project file in Visual Studio or another text editor and set the AndroidDexTool MSBuild property to d8 :. Project authors are encouraged to migrate their projects to D8 at their earliest convenience to prepare for this change. The XA warning has been updated to reflect a more recent minimum target version of Android 9 API level 28 for submissions to the Google Play store.
The following warning will now appear for projects that have an earlier version set under Compile using Android version: Target Framework in the Visual Studio project property pages:.
The Android App Bundle publishing format is not currently compatible with the recommended fast deployment settings for Debug configuration deployments. Because this configuration is not currently supported, Xamarin. Android now produces an error for it instead of a warning:. For example, to download the Google Android Emulator package, click the check mark next to Android Emulator and click the Apply Changes button:. A dialog may be shown with the message, The following package requires that you accept its license terms before installing :.
Click Accept if you accept the Terms and Conditions. At the bottom of the window, a progress bar indicates download and installation progress. After the installation completes, the Tools tab will show that the selected tools and extras were installed.
The Platforms tab displays a list of platform SDK versions along with other resources like system images for each platform:. This screen lists the Android version such as Android 8. When all components of a platform are installed, a checkmark appears next to the platform name. If not all components of a platform are installed, the box for that platform is filled.
Click - to unexpand the component listing for a platform. To add another platform to the SDK, click the box next to the platform until the checkmark appears to install all of its components, then click Apply Changes :. To install only specific components, click the box next to the platform once.
You can then select any individual components that you need:. Notice that the number of components to install appears next to the Apply Changes button. The topics in this section explain how to install and configure Xamarin. Android to work with Visual Studio on Windows and macOS, how to use the Android SDK Manager to download and install Android SDK tools and components that are required for building and testing your app, how to configure the Android emulator for debugging, and how to connect a physical Android device to your development computer for debugging and final testing your app.
This guide walks you through the installation steps and configuration details required to install Xamarin. Android on Windows. By the end of this article, you will have a working Xamarin. Android installation integrated into Visual Studio, and you'll be ready to start building your first Xamarin. Android application. The update method is used to store such data:. Automatic events ensure that basic user data gets tracked with as little effort as just including the SDK into your game. Automatic events include sessions, installation, identification and payments tracking.
Session is a time spent in the game, it starts when the game is launched and ends when the game gets dismissed from recent apps or is freed from memory in another way. Installation event is fired only once for the whole lifetime of the game on one device when the game is launched for the first time. For more information about this topic, please refer to the aquisition documentation. Please note that com.
Example of installation event:. Identification event is tracked each time the identify method is called. Example of an identification event:.
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