Platform: (attempt to) build AndroidApplication test using CMake.

Currently fails at runtime because I forgot to link stuff.

CMakeLists.txt

@@ -61,6 +61,14 @@ find_package(Corrade REQUIRED Utility)
 
 include(CMakeDependentOption)
 
+# For experimental Gradle-less Android APK creation. Only with CMake > 3.7 that
+# has builtin Android support -- Gradle uses 3.6 so this will nicely work in
+# both cases.
+if(CORRADE_TARGET_ANDROID AND CMAKE_ANDROID_NDK)
+    list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/toolchains/modules/")
+    include(UseAndroid)
+endif()
+
 # If targeting iOS, Android, Emscripten or Windows RT, set explicit OpenGL ES
 # support
 if(NOT CORRADE_TARGET_IOS AND NOT CORRADE_TARGET_ANDROID AND NOT CORRADE_TARGET_EMSCRIPTEN AND NOT CORRADE_TARGET_WINDOWS_RT)

src/Magnum/Platform/Test/AndroidManifest.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="cz.mosra.magnum.PlatformAndroidApplicationTest" android:versionCode="1" android:versionName="1.0">
+  <uses-feature android:glEsVersion="0x00020000" />
+  <application android:label="AndroidApplication Test" android:hasCode="false">
+    <activity android:name="android.app.NativeActivity" android:label="AndroidApplication Test">
+      <meta-data android:name="android.app.lib_name" android:value="PlatformAndroidApplicationTest" />
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+</manifest>

src/Magnum/Platform/Test/CMakeLists.txt

@@ -27,6 +27,9 @@ if(WITH_ANDROIDAPPLICATION)
     add_library(PlatformAndroidApplicationTest SHARED AndroidApplicationTest.cpp)
     target_link_libraries(PlatformAndroidApplicationTest PRIVATE MagnumAndroidApplication)
     set_target_properties(PlatformAndroidApplicationTest PROPERTIES FOLDER "Magnum/Platform/Test")
+    if(CMAKE_ANDROID_NDK)
+        android_create_apk(PlatformAndroidApplicationTest AndroidManifest.xml)
+    endif()
 endif()
 
 if(WITH_GLFWAPPLICATION)