[android] jni high level binding refactor

platform/android/src/graphics/rectf.cpp

@@ -0,0 +1,35 @@
+#include "rectf.hpp"
+
+namespace mbgl {
+namespace android {
+
+float RectF::getLeft(jni::JNIEnv& env, jni::Object<RectF> rectf) {
+    static auto field = RectF::javaClass.GetField<float>(env, "left");
+    return rectf.Get(env, field);
+}
+
+float RectF::getTop(jni::JNIEnv& env, jni::Object<RectF> rectf) {
+    static auto field = RectF::javaClass.GetField<float>(env, "top");
+    return rectf.Get(env, field);
+}
+
+float RectF::getRight(jni::JNIEnv& env, jni::Object<RectF> rectf) {
+    static auto field = RectF::javaClass.GetField<float>(env, "right");
+    return rectf.Get(env, field);
+}
+
+float RectF::getBottom(jni::JNIEnv& env, jni::Object<RectF> rectf) {
+    static auto field = RectF::javaClass.GetField<float>(env, "bottom");
+    return rectf.Get(env, field);
+}
+
+void RectF::registerNative(jni::JNIEnv& env) {
+    // Lookup the class
+    RectF::javaClass = *jni::Class<RectF>::Find(env).NewGlobalRef(env).release();
+}
+
+jni::Class<RectF> RectF::javaClass;
+
+
+} // namespace android
+} // namespace mbgl