flutter 谷歌地方 : Unhandled Exception: Null check operator used on a null value

Question

我正在使用 google map 开发应用程序和 google places .
当我打电话时PlacesAutocomplete.show() ，它给出了以下错误消息。 Null check operator used on a null value

pubspec.yaml

environment:
   sdk: ">=2.7.0 <3.0.0"

dependencies:
   google_maps_flutter: ^2.0.5
   flutter_polyline_points: ^1.0.0
   location: ^4.1.1  
   flutter_google_places: ^0.3.0

称呼

InkWell(
   onTap: () async {
       Prediction p = await PlacesAutocomplete.show(
          context: context,
          apiKey: GOOGLE_API_KEY,
       );
    }, child: Text("SHOW") 
),

提前致谢。

Answer 1

您需要提供函数 .show 的所有必需和非空参数。类似的东西:

Prediction p = await PlacesAutocomplete.show(
      offset: 0,
      radius: 1000,
      strictbounds: false,
      region: "us",
      language: "en",
      context: context,
      mode: Mode.overlay,
      apiKey: Env.googleapikey,
      sessionToken: sessionToken,
      components: [new Component(Component.country, "us")],
      types: ["(cities)"],
      hint: "Search City",
      startText: city == null || city == "" ? "" : city
    );