update for lottie

Samples/UIWidgetsSamples_2019_4/Assets/CountDemo.unity

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com.unity.uiwidgets/Runtime/engine2/AndroidUnpackStreamingAsset.cs

     [DllImport(NativeBindings.dllName)]
     internal static extern void InitUnpackFile(UnpackFileCallback unpack);
     
-    internal delegate bool UnpackFileCallback(string file);
+    internal delegate string UnpackFileCallback(string file);
-    internal static bool unpackFile(string file) {
+    internal static string unpackFile(string file) {
         if (Application.platform == RuntimePlatform.Android) {
             var dir = Application.temporaryCachePath + "/";
             if (!File.Exists(dir + file)) {
                     Debug.Log("Error unpacking 'jar:file://" + Application.dataPath + "!/assets/" + file +
                               "'");
                     dir = "";
-                    return false;
+                    return dir + file;
-            return true;
+            return dir + file;
-        return false;
+        return "";
     }
     
     public static void OnEnable()

com.unity.uiwidgets/Runtime/engine2/UIWidgetsPanelWrapper.cs

 
         void _enableUIWidgetsPanel(string font_settings) {
             UIWidgetsPanel_onEnable(_ptr, _renderTexture.GetNativeTexturePtr(),
-                _width, _height, devicePixelRatio, Application.streamingAssetsPath, font_settings);
+                _width, _height, devicePixelRatio, Application.temporaryCachePath, font_settings);
         }
 
         void _resizeUIWidgetsPanel() {

engine/src/assets/directory_asset_bundle.cc

   }
 
 #if __ANDROID__
-    bool success = AndroidUnpackStreamingAsset::Unpack(asset_name.c_str());
+    const char* file = AndroidUnpackStreamingAsset::Unpack(asset_name.c_str());
 #endif
 
   auto mapping = std::make_unique<fml::FileMapping>(fml::OpenFile(

engine/src/lib/ui/painting/skottie.cc

 #include "skottie.h"
 
 #include "lib/ui/ui_mono_state.h"
+#include "shell/platform/unity/android_unpack_streaming_asset.h"
+#if __ANDROID__
+  std::string pthstr = std::string(path);
+  int id = pthstr.find("assets/") + 7;
+  std::string file = pthstr.substr(id);
+  const char* fileOut = AndroidUnpackStreamingAsset::Unpack(file.c_str());
+  path = (char*)fileOut;
+#endif
   sk_sp<skottie::Animation> animation_ = skottie::Animation::MakeFromFile(path);
   return fml::MakeRefCounted<Skottie>(animation_);
 }

engine/src/shell/platform/unity/android_unpack_streaming_asset.cc

 
 namespace uiwidgets {
 
- bool AndroidUnpackStreamingAsset::Unpack(const char* file) {
+const char* AndroidUnpackStreamingAsset::Unpack(const char* file) {
   return _unpack(file);
 }
 

engine/src/shell/platform/unity/android_unpack_streaming_asset.h

 
 namespace uiwidgets {
 
-typedef bool (*UnpackFileCallback)(const char* file);
+typedef const char* (*UnpackFileCallback)(const char* file);
 
 
 class AndroidUnpackStreamingAsset{
-  static bool Unpack(const char* file);
+  static const char* Unpack(const char* file);
 };
 
 } // namespace uiwidgets