Flutter

问题 Consider a stack of widgets as shown in the image. We can see that index 0 widget is attached with index 1, 2, 3, 4 widgets; ...; index 3 widget is attached with index 4 widget and index 4 widget is not attached with anyone. Now when I drag a widget, all the attached widget should also be dragged with it i.e. if I try to drag the index 2 widget, the dragged widgets should be the stack of index 2, 3, 4 widgets. if I try to drag the index 4 widget, the dragged widget should be only the index 4

问题 i converted list into File of .csv extension then tried OpenFile.open and ended up with error No permissions found in manifest for: 2 , tried canLaunch and ended up with error name.csv exposed beyond app through Intent.getData(), Failed to handle method call so how to open that csv file in any 3rd part application. 回答1: You can copy paste run full code below and make sure you have a file /sdcard/Download/sample.csv , see picture below You also need CSV Viewer installed in your Emulator code

问题 I have a Image inside a GestureDetector widget. I want to change this image when onTapDown is called, and then change it again when onTapUp is called. Is there possible to do that? In other app (Native Android app with java), I used to do it using a button and changing its background with a selector xml, like this: <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/image1" /> <item

问题 I want to get all elements in a document loaded in flutter webview and then click on a html element. How can I do it? My webview code: //WebView WebView( initialUrl: "url", javascriptMode: JavascriptMode.unrestricted, onWebViewCreated: (WebViewController c){ controller = c; }, onPageStarted: (String s) async { setState(() { // on page started codes }); }, onPageFinished: (String s) async { setState(() { // on page finished codes }); }, ), 回答1: I using WebViewController.evaluateJavascript()

问题 I want to get all elements in a document loaded in flutter webview and then click on a html element. How can I do it? My webview code: //WebView WebView( initialUrl: "url", javascriptMode: JavascriptMode.unrestricted, onWebViewCreated: (WebViewController c){ controller = c; }, onPageStarted: (String s) async { setState(() { // on page started codes }); }, onPageFinished: (String s) async { setState(() { // on page finished codes }); }, ), 回答1: I using WebViewController.evaluateJavascript()

问题 Text turn to white when I got select dark mode but I want to make all texts white70 or something(including buttons and regular texts). How can I definde the default text color for dark mode? My Theme data like this right now: class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return DynamicTheme( defaultBrightness: Brightness.light, data: (brightness) => ThemeData( primarySwatch: Colors.blueGrey, brightness: brightness, ), 回答1: You can do something similar to

问题 My flutter app runs fine on the emulator, runs fine on my android when connected via USB, but crashes before opening when updated from the play store. Does the same to everyone else that has tried the update. So I thought I would try rebuilding as apk and install from firebase distribution. flutter build works fine if i run as appbundle, or apk but only fails on apk --split-per-abi. I am not sure if this error has to do with why it's crashing or if it's a new problem. Here is the error I get

问题 My flutter app runs fine on the emulator, runs fine on my android when connected via USB, but crashes before opening when updated from the play store. Does the same to everyone else that has tried the update. So I thought I would try rebuilding as apk and install from firebase distribution. flutter build works fine if i run as appbundle, or apk but only fails on apk --split-per-abi. I am not sure if this error has to do with why it's crashing or if it's a new problem. Here is the error I get

问题 I have an idiot question. is it possible to run the build runner in an application compiled for dynamic code generation? 回答1: In a Flutter application, no. Flutter apps neither have the ability to dynamically evaluate Dart code, nor do they have access to the tools needed to parse and generate source code. 来源： https://stackoverflow.com/questions/61015321/run-flutter-builder-runner-in-compiled-app

问题 I have an idiot question. is it possible to run the build runner in an application compiled for dynamic code generation? 回答1: In a Flutter application, no. Flutter apps neither have the ability to dynamically evaluate Dart code, nor do they have access to the tools needed to parse and generate source code. 来源： https://stackoverflow.com/questions/61015321/run-flutter-builder-runner-in-compiled-app