[ion/simulator/android] Get the language directly

Without using the "--language" command-line option

ion/src/simulator/android/Makefile

@@ -1,12 +1,12 @@
 ion_src += $(addprefix ion/src/simulator/android/src/cpp/, \
   haptics_enabled.cpp \
   platform_images.cpp \
+  platform_language.cpp \
 )
 
 ion_src += $(addprefix ion/src/simulator/shared/, \
   dummy/journal.cpp \
   dummy/keyboard_callback.cpp \
-  dummy/language.cpp \
   dummy/window_callback.cpp \
   clipboard_helper.cpp \
   haptics.cpp \

ion/src/simulator/android/src/cpp/platform_language.cpp

@@ -0,0 +1,32 @@
+#include "../../../shared/platform.h"
+#include <jni.h>
+
+namespace Ion {
+namespace Simulator {
+namespace Platform {
+
+const char * languageCode() {
+  static char buffer[4] = {0};
+  if (buffer[0] == 0) {
+    JNIEnv * env = static_cast<JNIEnv *>(SDL_AndroidGetJNIEnv());
+    jobject activity = static_cast<jobject>(SDL_AndroidGetActivity());
+
+    jclass j_class = env->FindClass("com/numworks/calculator/EpsilonActivity");
+    jmethodID j_methodId = env->GetMethodID(
+      j_class,
+      "retrieveLanguage",
+      "(V)Ljava/lang/String;"
+    );
+
+    jstring j_language = static_cast<jstring>(env->CallObjectMethod(activity, j_methodId));
+    const char * language = env->GetStringUTFChars(j_language, nullptr);
+    memcpy(buffer, language, 4);
+    buffer[3] = 0;
+    env->ReleaseStringUTFChars(j_language, language);
+  }
+  return buffer;
+}
+
+}
+}
+}

ion/src/simulator/android/src/java/com/numworks/calculator/EpsilonActivity.java

@@ -28,13 +28,6 @@ public class EpsilonActivity extends SDLActivity {
     };
   }
 
-  @Override
-  protected String[] getArguments() {
-    Locale currentLocale = getResources().getConfiguration().locale;
-    String[] arguments = {"--language", currentLocale.getLanguage()};
-    return arguments;
-  }
-
   public Bitmap retrieveBitmapAsset(String identifier) {
     Bitmap bitmap = null;
     try {
@@ -47,6 +40,10 @@ public class EpsilonActivity extends SDLActivity {
     return bitmap;
   }
 
+  public String retrieveLanguage() {
+    return getResources().getConfiguration().locale.getLanguage();
+  }
+
   public void telemetryInit() {
     sAnalytics = GoogleAnalytics.getInstance(this);
     sTracker = sAnalytics.newTracker("UA-93775823-3");