FlutterFragment第一次显示时闪现黑屏

百度下来解决的都是FlutterActivity黑屏的解决方法，并不适用于FlutterFragment，区别在于FlutterActivity实现了SplashScreenProvider接口。

 FlutterFragment源码贴上

@Nullable
public SplashScreen provideSplashScreen() {
    FragmentActivity parentActivity = this.getActivity();
    if (parentActivity instanceof SplashScreenProvider) {
        SplashScreenProvider splashScreenProvider = (SplashScreenProvider)parentActivity;
        return splashScreenProvider.provideSplashScreen();
    } else {
        return null;
    }
}

注意！这个时候所fragment所绑定的activity并没有实现SplashScreenProvider接口，所以不会调用

provideSplashScreen（）函数。

所以，解决方案：

Activity  实现 SplashScreenProvider 接口重写 provideSplashScreen（）函数

 @Override
    public SplashScreen provideSplashScreen() {
        return new DrawableSplashScreen(new ColorDrawable(Color.parseColor("#ffffff")));
    }