In order to run the Android Studio Java demo app, first run
AndroidStudioSetup.Bat, which will copy the lbrary and header files
to the proper folders.

Building a uCalc-powered Android app with Xamarin in Visual Studio 2015
========================================================================
Notes:
 Xamarin lets you develop apps with C# code
 Visual Studio 2015 can be freely downloaded from Microsoft
  (some licensing restrictions may apply)
 Make sure you have installed all the Cross-platform tools for VS (especially Xamarin)
 The Xamarin option that allows you to call native C++ code is not free
  Xamarin gives you a free 30 trial for this feature.
  For a fully free alternative, use Android Studio (uses Java instead of C#).

Create a new project
 New Project / Templates / Visual C# / Android / Blank App
Add the uCalc library to your project
 Create a sub folder named lib in your Project folder
  This can be tricky - DO NOT create it from the command prompt
   Right-click your project name in the Solution Explorer
    Add / New folder - name it lib
     Right-click the lib folder & add these 2 subfolders: x86 and armeabi-v7a
      Right click x86, then Add / Existing Item...
       Select libuCalcAndroid.so from uCalc\Lib\Android\jniLibs\x86
      Right click armeabi-v7a, then Add / Existing Item...
       Select libuCalcAndroid.so from uCalc\Lib\Android\jniLibs\armeabi-v7a
      Note:
       The x86 lib is for testing on an Android emulator on your Windows PC
       The armeabi-v7a lib is for the actual app on a physical Android device
       (or a desktop ARM emular, which is slower than the native x86 emulator)
      Right-click libuCalcAndroid.so (same procudure for both of them)
       Properties / Advanced / Build Action / AndroidNativeLibrary      
 From the menu Project / Add Existing Item / uCalcXamarin.cs
  This is found in uCalc\Include
From this point the rest is like using uCalc with C#

Building a uCalc-powered Android app with Java in Android Studio
================================================================
Notes:
 Android Studio lets you create apps using Java
 Android Studio can be freely downloaded from:
  developer.android.com/sdk
  
 Before running Android Studio, make sure to download and install the Java JDK
  www.oracle.com/technetwork/java/javase/downloads

Create a new project
 Quick Start / Start a new Android Studio project
  Choose an app name & your preferred configurations; click Next each time
  Dig into subfolders and add a ucalc\lib subfolder under \com
   You should end up with [MyApp]\app\src\main\java\com\ucalc\lib
   (you can create this from the command prompt instead of Android Studio)
  Copy uCalc.java and uCalcImport.java into that folder
  Under [MyApp]\app\src\main creat this folder: jniLibs
   Under jniLibs create these 2 folders: x86 and armeabi-v7a
    Copy the two copies of uCalcAndroid.so from uCalc\Lib\Android\jniLibs to
    the respective directories.
     The x86 lib is for testing on an Android emulator on your Windows PC
     The armeabi-v7a lib is for the actual app on a physical Android device
     (or a desktop ARM emular, which is slower than the native x86 emulator)
     
  Towards the top of Java files that will use uCalc add this:
   import com.ucalc.lib.uCalc;
  For the buttons & plotting in the uCalc demo, I found it necessary to add:
   import android.widget.*;
   import android.graphics.*;
   import android.graphics.drawable.*;
