[android] geojson conversion optimisation

1 files changed, 27 insertions, 0 deletions

diff --git a/platform/android/src/geojson/position.cpp b/platform/android/src/geojson/position.cpp
new file mode 100644
index 0000000000..c0e6da3887
--- /dev/null
+++ b/platform/android/src/geojson/position.cpp
@@ -0,0 +1,27 @@
+#include "position.hpp"
+
+namespace mbgl {
+namespace android {
+namespace geojson {
+
+mapbox::geojson::point Position::convert(jni::JNIEnv &env, jni::Object<Position> jPosition) {
+    static auto method = Position::javaClass.GetMethod<jni::Array<jdouble> ()>(env, "getCoordinates");
+    // Array with 0: longitude, 1: latitude (and optionally 2: altitude)
+    auto coordinates = jPosition.Call(env, method);
+    jdouble lngLat[2];
+    coordinates.GetRegion(env, 0, lngLat);
+    mapbox::geojson::point point(lngLat[0], lngLat[1]);
+    jni::DeleteLocalRef(env, coordinates);
+    return point;
+}
+
+void Position::registerNative(jni::JNIEnv &env) {
+    // Lookup the class
+    javaClass = *jni::Class<Position>::Find(env).NewGlobalRef(env).release();
+}
+
+jni::Class<Position> Position::javaClass;
+
+} // namespace geojson
+} // namespace android
+} // namespace mbgl
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