migrate to interface

Author: cg021

shell/platform/android/jni/platform_view_android_jni.h

@@ -130,6 +130,13 @@ class PlatformViewAndroidJNI {
                                                 int y,
                                                 int width,
                                                 int height) = 0;
+  //----------------------------------------------------------------------------
+  /// @brief      Initiates the initialization of a frame if using hybrid 
+  ///             composition.
+  ///
+  /// @note       Must be called from the platform thread.
+  ///
+  virtual void FlutterViewBeginFrame() = 0;
 };
 
 }  // namespace flutter

shell/platform/android/platform_view_android_jni_impl.cc

@@ -79,10 +79,6 @@ static jmethodID g_update_custom_accessibility_actions_method = nullptr;
 static jmethodID g_on_first_frame_method = nullptr;
 
 static jmethodID g_on_engine_restart_method = nullptr;
-void FlutterViewOnPreEngineRestart(JNIEnv* env, jobject obj) {
-  env->CallVoidMethod(obj, g_on_engine_restart_method);
-  FML_CHECK(CheckException(env));
-}
 
 static jmethodID g_on_begin_frame_method = nullptr;
 void FlutterViewBeginFrame(JNIEnv* env, jobject obj) {
@@ -720,8 +716,16 @@ bool PlatformViewAndroid::Register(JNIEnv* env) {
     return false;
   }
 
+  g_on_display_platform_view_method = env->GetMethodID(
+      g_flutter_jni_class->obj(), "onDisplayPlatformView", "(IIIII)V");
+
+  if (g_on_display_platform_view_method == nullptr) {
+    FML_LOG(ERROR) << "Could not locate onDisplayPlatformView method";
+    return false;
+  }
+
   g_on_begin_frame_method =
-      env->GetMethodID(g_flutter_jni_class->obj(), "onBeginFrame", "()V");
+    env->GetMethodID(g_flutter_jni_class->obj(), "onBeginFrame", "()V");
 
   if (g_on_begin_frame_method == nullptr) {
     FML_LOG(ERROR) << "Could not locate onBeginFrame method";
@@ -1044,4 +1048,17 @@ void PlatformViewAndroidJNIImpl::FlutterViewDisplayOverlaySurface(
   FML_CHECK(CheckException(env));
 }
 
+void PlatformViewAndroidJNIImpl::FlutterViewBeginFrame() {
+  JNIEnv* env = fml::jni::AttachCurrentThread();
+
+  auto java_object = java_object_.get(env);
+  if (java_object.is_null()) {
+    return;
+  }
+
+  env->CallVoidMethod(java_object.obj(), g_on_begin_frame_method);
+
+  FML_CHECK(CheckException(env));
+}
+
 }  // namespace flutter

shell/platform/android/platform_view_android_jni_impl.h

@@ -62,6 +62,9 @@ class PlatformViewAndroidJNIImpl final : public PlatformViewAndroidJNI {
                                         int width,
                                         int height) override;
 
+  void FlutterViewBeginFrame() override;
+
+
  private:
   // Reference to FlutterJNI object.
   const fml::jni::JavaObjectWeakGlobalRef java_object_;