You can assign a `TextStyle`

    TextField(
      style: TextStyle(color: Colors.white),
      ...
    )

https://docs.flutter.io/flutter/painting/TextStyle-class.html



In the example bellow, text is &#39;red&#39; and the background of the TextField is &#39;orange&#39;.

    TextField(
      style: TextStyle(color: Colors.red),
      decoration: InputDecoration(fillColor: Colors.orange, filled: true),
    )

Is that what you mean?

If you want to do it generically through the app&#39;s theme, it&#39;s indeed tricky. It&#39;s probably going to be something like that:

    theme: ThemeData(
        textTheme: TextTheme(
          bodyText1: TextStyle(color: Colors.black),
          bodyText2: TextStyle(color: Colors.black),
          button: TextStyle(color: Colors.black),
          caption: TextStyle(color: Colors.black),
          subtitle1: TextStyle(color: Colors.red), // &lt;-- that&#39;s the one
          headline1: TextStyle(color: Colors.black),
          headline2: TextStyle(color: Colors.black),
          headline3: TextStyle(color: Colors.black),
          headline4: TextStyle(color: Colors.black),
          headline5: TextStyle(color: Colors.black),
          headline6: TextStyle(color: Colors.black),
        ),
        inputDecorationTheme: InputDecorationTheme(
          fillColor: Colors.orange,
          filled: true,
        )
    )


To change it in ThemeData I used:

    ThemeData(
          textTheme: TextTheme(subtitle1: TextStyle(color: Colors.grey)),



I&#39;m trying to give useful information but I am far from being a data engineer.

I am currently using the python library pandas to execute a long series of transformation to my data which has a lot of inputs (currently CSV and excel files). The outputs are several excel files. I would like to be able to execute scheduled monitored batch jobs with parallel computation (I mean not as sequential as what I&#39;m doing with pandas), once a month.

I don&#39;t really know Beam or Airflow, I quickly read through the docs and it seems that both can achieve that. Which one should I use ? 

Apache Airflow or Apache Beam for data processing and job scheduling

How to add indexes to array in query string?

I tried send data like this:

    axios.get(&#39;/myController/myAction&#39;, { params: { storeIds: [1,2,3] })

And I got this url:

    http://localhost/api/myController/myAction?storeIds[]=1&amp;storeIds[]=2&amp;storeIds[]=3

So, I should to get this url:

    http://localhost/api/myController/myAction?storeIds[0]=1&amp;storeIds[1]=2&amp;storeIds[2]=3

What I should add in my params options to get this url?

How to correctly use axios params with arrays

I am working in the styles of my app, i am not able to change the color of the input of the `TextField`, there isn&#39;t any property to change it.

     Theme(
                data: new ThemeData(
                  hintColor: Colors.white
                ),
                child:
            TextField(
              focusNode: _focusUsername,
              controller: _controller,
              decoration: InputDecoration(
                border: InputBorder.none,
                fillColor: Colors.grey,
                filled: true,
                hintText: &#39;Username&#39;,
              ))),

How can I change the color of an string-input in a TextField?

I am working in the styles of my app, i am not able to change the color of the input of the <code>TextField</code>, there isn't any property to change it.
<pre><code class="hljs language-php"> Theme(
 data: new ThemeData(
 hintColor: Colors.white
 ),
 child:
 TextField(
 focusNode: _focusUsername,
 controller: _controller,
 decoration: InputDecoration(
 border: InputBorder.none,
 fillColor: Colors.grey,
 filled: true,
 hintText: 'Username',
 ))),
</code></pre>

I am just creating a form in Flutter. I am not able to set the top margin for the button.

    class _MyHomePageState extends State&lt;MyHomePage&gt; {
      
    String firstname; 
    String lastname;
    final scaffoldKey = new GlobalKey&lt;ScaffoldState&gt;();
    final formKey = new GlobalKey&lt;FormState&gt;();
    
    
        @override
      Widget build(BuildContext context) {
        return new Scaffold(
          key: scaffoldKey,
          appBar: new AppBar(
            title: new Text(&#39;Validating forms&#39;),
          ),
          body: new Padding(
            padding: const EdgeInsets.all(16.0),
            child: new Form(
              key: formKey,
              child: new Column(
                children: [
                  new TextFormField(
                    decoration: new InputDecoration(labelText: &#39;First Name&#39;),
                    validator: (val) =&gt;
                        val.length == 0 ?&quot;Enter FirstName&quot; : null,
                    onSaved: (val) =&gt; firstname = val,
                  ),
                  new TextFormField(
                    decoration: new InputDecoration(labelText: &#39;Password&#39;),
                    validator: (val) =&gt;
                        val.length ==0 ? &#39;Enter LastName&#39; : null,
                    onSaved: (val) =&gt; lastname = val,
                    obscureText: true,
                  ),
                  new RaisedButton(
                    onPressed: _submit,
                    child: new Text(&#39;Login&#39;),
                  ),
                ],
              ),
            ),
          ),
        );
      }



How to set margin for a Button in Flutter

Is there any way to change the default animation when navigating to/from a page in Flutter?

How to change navigation animation using Flutter

In Flutter, one can apply a theme to the app using ThemeData class. But there two propeties of this class that confuses me: `primaryColor` and `primarySwatch`. What&#39;s the difference between these two properties and when to use one or the other? Thanks.

What is the difference between primaryColor and primarySwatch in Flutter?

I have been trying to get the size of the whole context view in Flutter. But every time I try I&#39;m getting the above mentioned error. 
Here&#39;s my code:

    import &#39;package:flutter/material.dart&#39;;

    void main =&gt; runApp(new MyApp());

    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
    
        final size = MediaQuery.of(context).size;
        return new MaterialApp(
          home: new Scaffold(),
        );
      }
    }
Note: I also tried with a `StatefulWidget`. 
Please, help me find what I&#39;m doing wrong here.

Flutter Error: MediaQuery.of() called with a context that does not contain a MediaQuery

How to configure Flutter SDK? How to locate the Flutter SDK? I don&#39;t know the location of the SDK file. 

![Image][1]


  [1]: https://i.stack.imgur.com/WorXY.png

How to find the path of Flutter SDK

I am new to Flutter, I try to run one GitHub project but got an error like type List dynamic is not a subtype of type List int where. [Github Link][1]

**Error Line**
 

    List&lt;int&gt; genreIds;

    MediaItem._internalFromJson(Map jsonMap, {MediaType type: MediaType.movie})
          :
            type = type,
            id = jsonMap[&quot;id&quot;].toInt(),
            voteAverage = jsonMap[&quot;vote_average&quot;].toDouble(),
            title = jsonMap[(type == MediaType.movie ? &quot;title&quot; : &quot;name&quot;)],
            posterPath = jsonMap[&quot;poster_path&quot;] ?? &quot;&quot;,
            backdropPath = jsonMap[&quot;backdrop_path&quot;] ?? &quot;&quot;,
            overview = jsonMap[&quot;overview&quot;],
            releaseDate = jsonMap[(type == MediaType.movie
                ? &quot;release_date&quot;
                : &quot;first_air_date&quot;)],
    
            genreIds = jsonMap[&quot;genre_ids&quot;];//in this line
    
    
    }

[Above code File][2]

Any help will be appreciated, thank you in advance.



  [1]: https://github.com/aaronoe/FlutterCinematic
  [2]: https://github.com/aaronoe/FlutterCinematic/blob/master/lib/model/mediaitem.dart

type &#39;List&lt;dynamic&gt;&#39; is not a subtype of type &#39;List&lt;int&gt;&#39; where

New to flutter, can some one tells me whats wrong with below code[![enter image description here][1]][1]

      class GamePage extends StatelessWidget {
      int _row;
      int _column;
    
      GamePage(this._row,this._column);
    
      @override
      Widget build(BuildContext context) {
        return new Material(
          color: Colors.deepPurpleAccent,
          child:new Expanded(
              child:new GridView.count(crossAxisCount: _column,children: new List.generate(_row*_column, (index) {
            return new Center(
                child: new CellWidget()
            );
          }),) )
    
    
        );
      }
    }

Attaching error screenshot.


  [1]: https://i.stack.imgur.com/5b5lp.png

Expanded widgets must be placed inside Flex widgets

This is my code:

```dart
@override
Widget build(BuildContext context) {
  return new Material(
    color: Colors.deepPurpleAccent,
    child: new Column(
     mainAxisAlignment: MainAxisAlignment.center,
        children:&lt;Widget&gt;[new GridView.count(crossAxisCount: _column,children: new List.generate(_row*_column, (index) {
          return new Center(
              child: new CellWidget()
          );
        }),)]
    )
  );
}
```
Exception as follows:

    I/flutter ( 9925): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
    I/flutter ( 9925): The following assertion was thrown during performResize():
    I/flutter ( 9925): Vertical viewport was given unbounded height.
    I/flutter ( 9925): Viewports expand in the scrolling direction to fill their container.In this case, a vertical
    I/flutter ( 9925): viewport was given an unlimited amount of vertical space in which to expand. This situation
    I/flutter ( 9925): typically happens when a scrollable widget is nested inside another scrollable widget.
    I/flutter ( 9925): If this widget is always nested in a scrollable widget there is no need to use a viewport because
    I/flutter ( 9925): there will always be enough vertical space for the children. In this case, consider using a Column
    I/flutter ( 9925): instead. Otherwise, consider using the &quot;shrinkWrap&quot; property (or a ShrinkWrappingViewport) to size
    I/flutter ( 9925): the height of the viewport to the sum of the heights of its children.
    I/flutter ( 9925): 
    I/flutter ( 9925): When the exception was thrown, this was the stack:
    I/flutter ( 9925): #0      RenderViewport.performResize.&lt;anonymous closure&gt; (package:flutter/src/rendering/viewport.dart:827:15)
    I/flutter ( 9925): #1      RenderViewport.performResize (package:flutter/src/rendering/viewport.dart:880:6)
    I/flutter ( 9925): #2      RenderObject.layout (package:flutter/src/rendering/object.dart:1555:9)



  [1]: https://i.stack.imgur.com/L1r4G.png

Vertical viewport was given unbounded height

This code is from flutter gallery and i&#39;m trying to understanding and adapting it. I would know what this syntax means:

    class DemoItem&lt;T&gt; {
      DemoItem({
        this.valueName,
        this.hintName,
        this.valueSurname,
        this.hintSurname,
        this.builder,
        this.valueToString

      }) : textController = new TextEditingController(text: valueToString(valueName));

Especially i would know **what means the colon after the constructor** and if there is a way to define another TextEditingController, in addition to the one already defined.


Content Type	Original Author	Original Content on Stackoverflow
Question	Mauricio De armas	View Question on Stackoverflow
Solution 1 - Flutter	Günter Zöchbauer	View Answer on Stackoverflow
Solution 2 - Flutter	Feu	View Answer on Stackoverflow
Solution 3 - Flutter	Dariusz Lelek	View Answer on Stackoverflow

How can I change the color of an string-input in a TextField?

Flutter Problem Overview

Flutter Solutions

Solution 1 - Flutter

Solution 2 - Flutter

Solution 3 - Flutter

How to correctly use axios params with arrays

Apache Airflow or Apache Beam for data processing and job scheduling

Attributions