Android rayshader sample.

samples/android_sample/jni/dart_host.h

+#ifndef DART_HOST_H
+#define DART_HOST_H
+
+#include <android_native_app_glue.h>
+#include "bin/dartutils.h"
+#include "include/dart_api.h"
+#include "jni/activity_handler.h"
+#include "jni/context.h"
+#include "jni/graphics.h"
+#include "jni/input_service.h"
+#include "jni/timer.h"
+#include "jni/vm_glue.h"
+
+// Currently the life cycle management is very crude. We conservatively
+// shutdown the main isolate when we lose focus and create a new one when
+// we resume. This needs to be improved later when we understand this better,
+// and we need some hooks to tell the Dart script to save/restore state
+// (and an API that will support that).
+
+class DartHost : public ActivityHandler {
+ public:
+  explicit DartHost(Context* context);
+  virtual ~DartHost();
+
+ protected:
+  int32_t OnActivate();
+  void OnDeactivate();
+  int32_t OnStep();
+
+  void OnStart();
+  void OnResume();
+  void OnPause();
+  void OnStop();
+  void OnDestroy();
+
+  void OnSaveState(void** data, size_t size);
+  void OnConfigurationChanged();
+  void OnLowMemory();
+  void OnCreateWindow();
+  void OnDestroyWindow();
+  void OnGainedFocus();
+  void OnLostFocus();
+
+ private:
+  void Clear();
+  int32_t Activate();
+  void Deactivate();
+
+  ANativeWindow_Buffer window_buffer_;
+  InputHandler* input_handler_;
+  Timer* timer_;
+  Graphics* graphics_;
+  VMGlue* vm_glue_;
+  bool active_;
+};
+
+#endif
+