demos: Update Android documentation

diff --git a/BUILD.md b/BUILD.md
index 70636db..286e75e 100644 (file)
--- a/BUILD.md
+++ b/BUILD.md
@@ -176,6 +176,19 @@ update_external_sources_android.bat
 android-generate.bat
 ndk-build
 ```
+#### Android demos
+Use the following steps to build, install, and run Cube and Tri for Android:
+```
+cd demos/android
+android update project -s -p . -t "android-23"
+ndk-build
+ant -buildfile cube debug
+ant -buildfile tri debug
+adb install ./cube/bin/NativeActivity-debug.apk
+adb install ./tri/bin/NativeActivity-debug.apk
+adb shell am start com.example.Cube/android.app.NativeActivity
+adb shell am start com.example.Tri/android.app.NativeActivity
+```
 
 ## Ninja Builds - All Platforms
 The [Qt Creator IDE](https://qt.io/download-open-source/#section-2) can open a root CMakeList.txt as a project directly, and it provides tools within Creator to configure and generate Vulkan SDK build files for one to many targets concurrently, resolving configuration issues as needed. Alternatively, when invoking CMake use the -G Codeblocks Ninja option to generate Ninja build files to be used as project files for QtCreator