SkiaUI

Using Skia, Yoga, SurfaceView/TextureView to build a simple Flexbox-UI framework for Android.

steps：

1. Compile skia https://skia.org/docs/user/build/ ，or unzip arm64-v8a.zip and x86-64.zip files in jniLibs.
2. Using Skia GL context.
3. Two threads: ui-thread & render-thread.
4. Only support FlexboxLayout. Measure/Layout/Draw are triggered by Vsync.
5. TouchEvents: dispatchTouchEvent/interceptTouchEvent/onTouchEvent.
6. Animations support scale/rotate/translate，the interpolator will be executed in Layout then update SkRect.
7. Supported Widgets:
   View: rect, cornerRadius.
   ImageView: support png/gif, scaleType，cornerRadius, blur.
   TextView: use SkParagraph, use AlimamaFangYuanTiVF-Thin.ttf by default.
   Icon: use the iconfont.woff by default.
   ProgressBar: circle and linear style，also can be dragged.
   SVGView: svg file.
   ShaderView: render simple fragment-shader.
   Lottie: render lottie.json.
   VideoView: render local video by MediaCodec/HardwareBuffer/SkImage.
   YUVVideoView: render video by MediaCodec/SkRuntimeEffect.
   LyricView: parse .lrc/.srt files, use RecyclerView to render lyric.
   MovingArea: intercept TouchEvents by default and can move.
   InputView: binding to Java EditText and render it's text.
   Swiper: just like ViewPager.
   Other CustomsViews: Loading, Switch, Radio, Picker...
   PlatformView: render Android-Views such as WebView/EditText by SurfaceTexture/SkImage, just like Flutter.
   render CameraView by ImageReader/ByteBuffer/SkRuntimeEffect.
   render 3D View by Filament(other engines can also supported)/SurfaceTexture/SkImage.
   ...
8. scrollView: scroll, fling，for more optimizations.
9. RecyclerView: adapter，ViewHolder，for more optimizations.
10. Page: act as the same role as Activity.
11. C++: See CppTest.cpp.
12. js: See test.js in assets. Import v8 to evaluate javascript.
13. kotlin: See JetpackComposeTest.kt in java. Import kotlin and Compose-runtime to run.
14. Dirty-Render: markDirty after "draw" if necessary.