Added details from #820

Now describes manual parameter changes required in CMakeLists.txt, how to change ndk-build options, and how to integrate the generated files into an Android Studio project.

Web/coolprop/wrappers/Android/index.rst

@@ -19,13 +19,28 @@ Linux & OSX
 
 * Install NDK from here: https://developer.android.com/ndk/downloads/index.html
 
-* Do the build with something like:
+* To Build 
 
     # Check out the sources for CoolProp
     git clone https://github.com/CoolProp/CoolProp --recursive
-    # Move into the folder you just created
+    # Open the CMakeLists.txt file in the CoolProp directory for editing
+    # Within the COOLPROP_ANDROID_MODULE modify the command:  set(ANDROID_PACKAGE_NAME "CoolProp") to reflect your package name
+    # Make and move into a build folder
     mkdir -p CoolProp/build && cd CoolProp/build
+    # If a target architecture other than the default (armeabi) is desired, the ndk-build can be modified by editing wrappers/Android/Android.mk.template.  For details see https://developer.android.com/ndk/guides/index.html
     # Construct the makefile using CMake
-    cmake .. -DCOOLPROP_ANDROID_MODULE=ON -DNDK_PATH=~/Downloads/android-ndk-r10e
+    cmake .. -DCOOLPROP_ANDROID_MODULE=ON -DNDK_PATH=~/Downloads/android-ndk-r10e (change path based on your installation)
     # Now actually do the build
-    cmake --build .
+    cmake --build .
+
+
+* To Incorporate into an Android Studio Project
+    # Copy the java files from the package directory (i.e build/com/example/myprogram) to the pacakge directory of the android proejct
+    # Copy the the build/libs/armeabi folder containing the .so file to the app/src/main/jniLibs folder of the Android Project (you may have reate the jniLibs folder).
+    # In the main activity of the Android Project add:
+
+		static {
+			System.loadLibrary("CoolProp");
+		}
+
+	# Now CoolProp functions can be called as described in the java wrapper documentation.