Unity Development Memo 000003: There is no Android option in External Tools, what should I do?

problem:The red box at the location below does not have an input box for adding JDK and SDK paths.

We know that to package the android version of the application in Unity, you need to install the Java JDK and Android SDK in the Windows environment, and configure the system environment variables, and then after that in Unity->Edit->Preferences->External Tools The path to the JDK and SDK is configured, but this may be the case when installing Unity 5.x, there is no input box for you to enter the address. At this point, when you open the Build Settings dialog and want to publish the Andriod package, its Build and Build And Run buttons are not available (gray), as shown in the red box below.

In fact, this is because the Android build support is not installed when installing Unity software, and there is a button Open Download Page button in the Build Settings dialog box (red box 2 above), click this button to download the Android build support installation package. Install it in the Unity directory and reopen Unity. You will find that the above problems can be solved.

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