Click official Java SE download page to download Oracle JDK which is distributed in both archive (zip and tar.gz) and installer program (rpm on Linux, dmg on Mac and exe on Windows). Choose the installer according to your operating system, e.g. Windows x64 Installer for Windows – the file name is jdk-14windows-x64bin.exe.

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The Red Hat build of OpenJDK. The Red Hat build of OpenJDK is based on the upstream OpenJDK 8u and 11u projects. Red Hat maintains these projects upstream and adds additional future features into our builds that are available for download here.
Install Oracle: 8 or later OR OpenJDK: 11 or later from the link above. For Linux users, install openjdk-11-jdk or openjdk-11-jre on Linux distributions. Download the Xiaomi ADB/Fastboot tools from the link provided above. Extract the file and launch the.jar file. That's all guys.

This guide describes the steps for switching to an internal distribution of OpenJDK. This distribution is intended for mobile development.

Overview

Beginning with Visual Studio 15.9 and Visual Studio for Mac 7.7, Visual Studio Tools for Xamarin has moved from Oracle’s JDK to a lightweight version of the OpenJDK that is intended solely for Android development. This is a required migration as Oracle is ending support for commercial distribution of JDK 8 in 2019, and JDK 8 is a required dependency for all Android development.

The benefits of this move are:

You will always have an OpenJDK version that works for Android development.
Downloading Oracle's JDK 9 or greater won’t affect the development experience.
Reduced download size and footprint.
No more issues with 3rd party servers and installers.

If you’d like to move to the improved experience sooner, builds of the Microsoft Mobile OpenJDK distribution are available for you to test on both Windows and Mac. The setup process is described below, and you can revert back to the Oracle JDK at any time.

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The mobile OpenJDK distribution is automatically installed for you if you select the Android SDK packages in the Visual Studio installer on Windows.

On Mac, the mobile OpenJDK will be installed for you as part of the Android workload for new installs. For existing Visual Studio for Mac users, you will be prompted to install it as part of your update. The IDE will prompt you to move to the new JDK, and will switch to using it at the next restart.

Troubleshooting

If you encounter issues with the setup on Mac or Windows, you can take the following steps for manual setup:

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Check if OpenJDK is installed on the machine in the correct location:

Mac – $HOME/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.x
Windows – C:Program FilesAndroidjdkmicrosoft_dist_openjdk_1.8.0.x

Point the IDE to the new JDK:

Mac – Click Tools > SDK Manager > Locations and change the Java SDK (JDK) Location to the full path of the OpenJDK installation. In the following example, this path is set to $HOME/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.9 but your version may be newer.

Windows – Click Tools > Options > Xamarin > Android Settings and change the Java Development Kit Location to the full path of the OpenJDK installation. In the following example, this path is set to C:Program FilesAndroidjdkmicrosoft_dist_openjdk_1.8.0.9, but your version may be newer:

Known Issues

Package 'OpenJDKV1.RegKey,version=1.8.0.25,chip=x64' failed to install

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This may be an issue in some corporate environments. OpenJDK is already on the machine - follow the troubleshooting steps above to point your IDE to the correct location. You can follow the status of the issues here.

Summary

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In this article, you learned how to configure your IDE to use Microsoft's Mobile OpenJDK distribution, and how to troubleshoot should you encounter issues.