Add JImage

android/CMakeLists.txt

@@ -18,6 +18,7 @@ add_library(
         src/main/cpp/FrameProcessorRuntimeManager.cpp
         src/main/cpp/FrameProcessorPlugin.cpp
         src/main/cpp/CameraView.cpp
+        src/main/cpp/JImage.cpp
         src/main/cpp/JImageProxy.cpp
         src/main/cpp/JImageProxyHostObject.cpp
         src/main/cpp/JHashMap.cpp

android/src/main/cpp/JImage.cpp

@@ -0,0 +1,27 @@
+//
+// Created by Marc Rousavy on 28.06.21.
+//
+
+#include "JImage.h"
+
+#include <jni.h>
+#include <fbjni/fbjni.h>
+
+namespace vision {
+
+using namespace facebook;
+using namespace jni;
+
+
+bool JImage::getIsValid() {
+  static const auto getNativeContextMethod = getClass()->getMethod<jlong()>("getNativeContext");
+  try {
+    getNativeContextMethod(javaClassLocal());
+    return true;
+  } catch (...) {
+    // function throws if the image is not active anymore
+    return false;
+  }
+}
+
+} // namespace vision

android/src/main/cpp/JImage.h

@@ -0,0 +1,19 @@
+//
+// Created by Marc Rousavy on 28.06.21.
+//
+
+#pragma once
+
+#include <jni.h>
+#include <fbjni/fbjni.h>
+
+namespace vision {
+
+struct JImage : public facebook::jni::JavaClass<JImage> {
+  static constexpr auto kJavaDescriptor = "Landroid/media/Image;";
+
+ public:
+  bool getIsValid();
+};
+
+} // namespace vision

android/src/main/cpp/JImageProxy.cpp

@@ -7,6 +7,8 @@
 #include <jni.h>
 #include <fbjni/fbjni.h>
 
+#include "JImage.h"
+
 namespace vision {
 
 using namespace facebook;
@@ -23,17 +25,10 @@ int JImageProxy::getHeight() {
 }
 
 bool JImageProxy::getIsValid() {
-  static const auto getImageMethod = getClass()->getMethod<jobject()>("getImage");
+  static const auto getImageMethod = getClass()->getMethod<JImage::javaobject()>("getImage");
   auto image = getImageMethod(javaClassLocal());
 
-  static const auto getHardwareBufferMethod = findClassLocal("android/media/Image")->getMethod<jobject()>("getHardwareBuffer");
-  try {
-    getHardwareBufferMethod(image.get());
-    return true;
-  } catch (...) {
-    // function throws if the image is not active anymore
-    return false;
-  }
+  return image->getIsValid();
 }
 
 int JImageProxy::getPlaneCount() {