Error building the androidEmptyExample

Hello @Prof_Sparkles, I've just opened a pull request https://github.com/openframeworks/openFrameworks/pull/4382 to correct the NDK version on the wiki.
It would be also helpful to add how to run the examples contained in the of_release/examples/android , these steps https://github.com/openframeworks/openFrameworks/blob/master/docs/android_studio.md#creating-projects-from-examples are not clear enough to me, could you explain it better?
Double clicking build.gradle does not open any pop-up window where I can press "Add now"