小编Shr*_*eya的帖子

所以我有一个函数返回一个未来的值.当这个函数执行时,我想从未来提取字符串.我该怎么做？

Future<String> coverImage(id, space) {
  String link = 'https://cdn.contentful.com/spaces/$space/assets/$id?access_token=1d4932ce2b24458e85ded26532bb81184e0d79c1a16c5713ec3ad391c2e8f5b3';
  return http.get(link).then((response) => decodeToImage(decodeJson(response.body)));   
}

这个函数返回Future<String>,我想在使用图像小部件时提取到字符串

我是新手,因为我遇到了问题.我正在尝试制作扩展面板列表.我能够制作列表,但无法使扩展面板展开或折叠.我正在附加代码.请看一下,让我知道这个问题.

ExpansionPanelList criteria;
criteria = new ExpansionPanelList(
  children: <ExpansionPanel>[
    new ExpansionPanel(
      headerBuilder: schoolheaderBuilder,
      body: new Text("school"),
      isExpanded: false,
    ),
    new ExpansionPanel(
      headerBuilder: hospitalheaderBuilder,
      body: new Text("hospital"),
    ),
    new ExpansionPanel(
        headerBuilder: vaheaderBuilder,
        body: new Text("va facility"),
        isExpanded: false),
    new ExpansionPanel(
        headerBuilder: restheaderBuilder,
        body: new Text("Restaurants"),
        isExpanded: false),
    new ExpansionPanel(
        headerBuilder: crimeheaderBuilder,
        body: new Text("Crime"),
        isExpanded: false),
    new ExpansionPanel(
        headerBuilder: commuteheaderBuilder,
        body: new Text("Commute"),
        isExpanded: false),
    new ExpansionPanel(
        headerBuilder: incomeBuilder,
        body: new Text("Household Income"),
        isExpanded: false),
    new ExpansionPanel(
        headerBuilder: househeaderBuilder,
        body: new …

嘿,我想询问是否有办法在flutter应用程序中使用google maps api.我想避免使用静态地图.如果有办法,请告诉我.

我正在尝试将图像作为图标。我可以将图像设置为图标，但唯一的问题是图像正在脱色。我不希望图像褪色。我希望图像按原样显示。那么有没有办法在flutter中保留用作图像图标的图像的颜色呢？