dart

How to request and check permissions in Flutter

由 强颜欢笑 提交于 2020-12-30 03:11:35
问题 I am using a various plugin to get user data, contact, photos and camera when the user clicks Don't allow, The application goes silent. I want to show the user the ask permission dialog when the user checks the Never ask again and Don't allow and enters the application again. Currently the app never ask to again when the user checks Don't allow I Know Users must grant permission for an app to access personal information, including the current location , camera , calendar , contacts ,

How to request and check permissions in Flutter

由 随声附和 提交于 2020-12-30 03:08:43
问题 I am using a various plugin to get user data, contact, photos and camera when the user clicks Don't allow, The application goes silent. I want to show the user the ask permission dialog when the user checks the Never ask again and Don't allow and enters the application again. Currently the app never ask to again when the user checks Don't allow I Know Users must grant permission for an app to access personal information, including the current location , camera , calendar , contacts ,

How to request and check permissions in Flutter

由 半城伤御伤魂 提交于 2020-12-30 03:08:35
问题 I am using a various plugin to get user data, contact, photos and camera when the user clicks Don't allow, The application goes silent. I want to show the user the ask permission dialog when the user checks the Never ask again and Don't allow and enters the application again. Currently the app never ask to again when the user checks Don't allow I Know Users must grant permission for an app to access personal information, including the current location , camera , calendar , contacts ,

How to request and check permissions in Flutter

由 半城伤御伤魂 提交于 2020-12-30 03:08:19
问题 I am using a various plugin to get user data, contact, photos and camera when the user clicks Don't allow, The application goes silent. I want to show the user the ask permission dialog when the user checks the Never ask again and Don't allow and enters the application again. Currently the app never ask to again when the user checks Don't allow I Know Users must grant permission for an app to access personal information, including the current location , camera , calendar , contacts ,

Flutter detect end of keyboard hide animation

由 限于喜欢 提交于 2020-12-29 23:46:41
问题 I have a page in Flutter with a couple of widgets including a TextField (lets call this View1). When the user clicks the TextField I rebuild the page showing only the TextField and keyboard (lets call this View2). When the user finishes with the TextField I rebuild the page again showing all the widgets as before (lets call this View3 although note that it is the same as View1). This works fine except for one thing. I get a temporary yellow/black indicator (in debug mode) showing that there

Flutter detect end of keyboard hide animation

由 本小妞迷上赌 提交于 2020-12-29 23:33:13
问题 I have a page in Flutter with a couple of widgets including a TextField (lets call this View1). When the user clicks the TextField I rebuild the page showing only the TextField and keyboard (lets call this View2). When the user finishes with the TextField I rebuild the page again showing all the widgets as before (lets call this View3 although note that it is the same as View1). This works fine except for one thing. I get a temporary yellow/black indicator (in debug mode) showing that there

Flutter detect end of keyboard hide animation

由 旧城冷巷雨未停 提交于 2020-12-29 23:33:12
问题 I have a page in Flutter with a couple of widgets including a TextField (lets call this View1). When the user clicks the TextField I rebuild the page showing only the TextField and keyboard (lets call this View2). When the user finishes with the TextField I rebuild the page again showing all the widgets as before (lets call this View3 although note that it is the same as View1). This works fine except for one thing. I get a temporary yellow/black indicator (in debug mode) showing that there

Flutter 异常处理之图片篇

由 拥有回忆 提交于 2020-12-29 18:28:27
背景 说到异常处理，你可能直接会认为不就是 try-catch 的事情，至于写一篇文章单独来说明吗？ 如果你是这么想的，那么本篇说不定会给你惊喜哦~ 而且本篇聚焦在图片的异常处理。 场景 学以致用，有具体的应用场景，能够加深我们对知识的掌握。 我们以简书的文章列表为例，如下图： 假设产品有这样的需求，当右边的封面图加载失败的时候，用一个默认图片替换或者直接让文本横向填充原有图片位置。 不管处理方式是怎样，首先我们要做的就是能够知道图片加载失败。 如何获知图片加载失败呢？下面我们通过 Flutter 自带网络加载 API 和一个第三方网络库来进行对比说明。 Image.network 我们看下源码，如下： Image.network(String src, { Key key, double scale = 1.0, this.semanticLabel, this.excludeFromSemantics = false, this.width, this.height, this.color, this.colorBlendMode, this.fit, this.alignment = Alignment.center, this.repeat = ImageRepeat.noRepeat, this.centerSlice, this.matchTextDirection =

Triggering initial event in BLoC

由 痴心易碎 提交于 2020-12-29 13:18:30
问题 example_states: abstract class ExampleState extends Equatable { const ExampleState(); } class LoadingState extends ExampleState { // } class LoadedState extends ExampleState { // } class FailedState extends ExampleState { // } example_events: abstract class ExampleEvent extends Equatable { // } class SubscribeEvent extends ExampleEvent { // } class UnsubscribeEvent extends ExampleEvent { // } class FetchEvent extends ExampleEvent { // } example_bloc: class ExampleBloc extends Bloc

Dart timeout on await Future

由 ﹥＞﹥吖頭↗ 提交于 2020-12-29 13:18:30
问题 How to make a await future not last more than 5 seconds ? I need it because in some networking operation, the connection is sometimes producing silent error. Hence my client just wait for hours with no response. Instead, I want it trigger an error when the clients waits for more than 5 seconds My code can trigger the error but it is still waiting Future shouldnotlastmorethan5sec() async { Future foo = Future.delayed(const Duration(seconds: 10));; foo.timeout(Duration(seconds: 5), onTimeout: (
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