Android: add a couple of JNI classes definitions.

modules/juce_core/native/juce_android_JNIHelpers.h

@@ -476,6 +476,12 @@ DECLARE_JNI_CLASS (AndroidViewGroup, "android/view/ViewGroup")
 DECLARE_JNI_CLASS (JavaArrayList, "java/util/ArrayList");
 #undef JNI_CLASS_MEMBERS
 
+#define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD) \
+  METHOD (booleanValue, "booleanValue", "()Z")
+
+DECLARE_JNI_CLASS (JavaBoolean, "java/lang/Boolean");
+#undef JNI_CLASS_MEMBERS
+
 #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD) \
   METHOD (constructor,        "<init>",             "()V") \
   METHOD (containsKey,        "containsKey",        "(Ljava/lang/String;)Z") \
@@ -526,6 +532,12 @@ DECLARE_JNI_CLASS (JavaCharSequence, "java/lang/CharSequence");
 DECLARE_JNI_CLASS (JavaClass, "java/lang/Class");
 #undef JNI_CLASS_MEMBERS
 
+#define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD) \
+  METHOD (toString, "toString", "()Ljava/lang/String;")
+
+DECLARE_JNI_CLASS (JavaEnum, "java/lang/Enum");
+#undef JNI_CLASS_MEMBERS
+
 #define JNI_CLASS_MEMBERS(METHOD, STATICMETHOD, FIELD, STATICFIELD) \
  METHOD (constructor,     "<init>",          "(Ljava/lang/String;)V") \
  METHOD (getAbsolutePath, "getAbsolutePath", "()Ljava/lang/String;") \