If the purpose is only testing how the UI works on iOS, then Flutter Inspector will do the job.

Click on the Flutter Inspector from the right pane and click on &#39;Toggle Platform Mode&#39; from the top menu of the newly opened box. This will change the UI of the running app on your device.

Most iOS developers use (in a separate window) VMWare WorkStation (a virtual Machine) and install MacOS with XCode.
 
You can always go back to VMWare, but these 2 links might be helpful.

https://www.dreamytricks.net/ios-emulator-windows-run-ios-apps/

https://developer.xamarin.com/guides/cross-platform/windows/ios-simulator/



It seems there is no direct way to run the app on iOS emulator unless you use Mac pc or laptop. However, this article provides you with an indirect way to run the app. [Developing and debugging Flutter apps for iOS without a Mac][1]


  [1]: https://medium.com/flutter-community/developing-and-debugging-flutter-apps-for-ios-without-a-mac-8d362a8ec667

maybe it&#39;s too late. But I will answer anyway. You can try IOS UI using this flutter package [device_preview](https://pub.dev/packages/device_preview).

Airflow is randomly not running queued tasks some tasks dont even get queued status. I keep seeing below in the scheduler logs

     [2018-02-28 02:24:58,780] {jobs.py:1077} INFO - No tasks to consider for execution.

I do see tasks in database that either have no status or queued status but they never get started.

The airflow setup is running https://github.com/puckel/docker-airflow on ECS with Redis. There are 4 scheduler threads and 4 Celery worker tasks. For the tasks that are not running are showing in queued state (grey icon) when hovering over the task icon operator is null and task details says: 

    	All dependencies are met but the task instance is not running. In most cases this just means that the task will probably be scheduled soon unless:- The scheduler is down or under heavy load

Metrics on scheduler do not show heavy load. The dag is very simple with 2 independent tasks only dependent on last run. There are also tasks in the same dag that are stuck with no status (white icon). 

*Interesting thing to notice is when I restart the scheduler tasks change to running state.*

Airflow 1.9.0 is queuing but not launching tasks

Full disclosure: I&#39;d qualify myself as having intermediate JavaScript knowledge. So this is slightly above my experience level at this time.

I&#39;ve got a Google Chrome Extension that does an AJAX request for a local `file:///` as soon as a page loads. After I get the response back from the request I use the returned code in several functions later on in my code. Most of the time I get the response back before my code that needs it runs. But sometimes I don&#39;t and everything breaks.

Now, I assume I could just throw all of the relevant code inside of the `xhr.onload` below. But that seems really inefficient? I have a lot of moving parts that rely on the response and it seems bad to put them all in there.

I&#39;ve perused several articles related to async/await and I&#39;m having trouble grasping the concept. I&#39;m also not 100% positive I&#39;m looking at this the right way. Should I even be considering using async/await?

Here is the code for my AJAX request.


      var xhr = new XMLHttpRequest();
      xhr.open(&quot;GET&quot;, url, true);
      xhr.onload = function(e) {
        code = xhr.response;
      };
      xhr.onerror = function () {
        console.error(&quot;** An error occurred during the XMLHttpRequest&quot;);
      };
      xhr.send();


Let&#39;s say I&#39;ve got a bunch of functions that need to fire afterwards later on in my code. Right now they just look like:

    function doTheThing(code) {
      // I hope the response is ready.
    }

What&#39;s the best way to approach this? FYI, the `Fetch` API isn&#39;t an option. 

Here&#39;s a high level view of how my code is structured.


    // AJAX request begins.
    
    // ...

    // A whole bunch of synchronous code that isn&#39;t dependant on 
    // the results of my AJAX request. (eg. Creating and appending
    // some new DOM nodes, calculating some variables) I don&#39;t want
    // to wait for the AJAX response when I could be building this stuff instead.
    
    // ...

    // Some synchronous code that is dependant on both my AJAX 
    // request and the previous synchronous code being complete.
    
    // ...

    // Some more synchronous code that needs the above line to 
    // be complete.

In JavaScript how do I/should I use async/await with XMLHttpRequest?

I have started to learn **flutter** by Google and installed it in **android studio**. I have an emulator for Android but I don&#39;t know how to run this in iOS.

Is it possible to run an iOS emulator in windows? If yes, how can I do that?

Flutter: iOS Emulator for Windows

I have started to learn flutter by Google and installed it in android studio. I have an emulator for Android but I don't know how to run this in iOS.
Is it possible to run an iOS emulator in windows? If yes, how can I do that?

I have a Double variable that is `0.0449999` and I would like to round it to 1 decimal place `0.1` .

I am using Kotlin but the Java solution is also helpful.

`val number:Double = 0.0449999`

I tried getting 1 decimal place with these two solutions:

1. `val solution = Math.round(number * 10.0) / 10.0`
2. `val solution = String.format(&quot;%.1f&quot;, number)`

The problem is that I get 0.0 in both cases because it rounds the number from `0.04` to `0.0`. It doesn&#39;t take all decimals and round it.

I would like to obtain 0.1: `0.045 -&gt; 0.05 -&gt; 0.1`

Round Double to 1 decimal place kotlin: from 0.044999 to 0.1

I&#39;m looking to migrate from listening to the Play Store&#39;s INSTALL_REFERRER intent, to using the new [Google Play Install Referrer Library](https://developer.android.com/google/play/installreferrer/library.html).

I am struggling to find a way to test this new library without first having to add my app to the Play Store. When listening for the INSTALL_REFERRER intent via a BroadcastReceiver, I could test by manually sending a broadcast via the Activity Manager to mimic the behavior. That is to say, I could test by [following these steps from Google](https://developers.google.com/analytics/solutions/testing-play-campaigns).

Does there also exist a way I can test this new library without having to first put my app on the Play Store?



Testing Google Play Install Referrer Library

I have good experience in android app development using java. Recently I came to know about flutter. So, I have tried to create a simple android app with flutter based on official [tutorial][1]. But surprisingly the debug app size is 25MB and release apk costs more than 7MB. It is really larger when compare with native developed android app. 

Is there any way to optimize it?

  [1]: https://flutter.io/get-started/codelab/

Flutter apps are too big in size

I&#39;m trying out react native and `eject`ed into a full build environment. Sadly, the eject-script did not create a sensible `.gitignore` file.

Not knowing a lot about app-development, I wonder what directories I could `.gitignore` here?

I&#39;m guessing:

* `android/build`
* `android/app/build`
* `android/.gradle/`

Are these alright, or are there any more directories I should `.gitignore`?

Recommended .gitignore for react-native

How would you pass info from Flutter back to Android/Native code if needed to interact with a specific API / hardware component? 

Are there any Event Channels that can send info the other way or something similar to a callback?

1. The [platform_channel][1] documentation points out &quot;method calls can also be sent in the reverse direction, with the platform acting as client to methods implemented in Dart. A concrete example of this is the [quick_actions plugin][2].&quot; I don&#39;t see how the native side is receiving a message from Flutter in this instance.
2. It looks like a [BasicMessageChannel][3]’s send() method can be used to send &quot;the specified message to the platform plugins on this channel&quot;. Can anyone provide a simple implementation example of this?


  [1]: https://flutter.io/platform-channels/
  [2]: https://pub.dartlang.org/packages/quick_actions
  [3]: https://docs.flutter.io/javadoc/io/flutter/plugin/common/BasicMessageChannel.html

How to pass a message from Flutter to Native?

I am trying to create a sample application with Flutter (fresh installation). [Android Studio][1] is also installed (fresh installation).

Here is the output of `flutter run`

    flutter run
    No connected devices.

The output of `flutter doctor`:

```lang-none
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v0.1.5, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] Android Studio (version 3.0)
[!] VS Code (version 1.20.1)
[!] Connected devices
! No devices available

! Doctor found issues in 2 categories.
```

Is there a solution to this problem?

  [1]: https://en.wikipedia.org/wiki/Android_Studio


Message &quot;flutter run: No connected devices&quot;

I have wasted a whole day trying out different solutions floating around in SO and other place mentioned to enable wifi on the android emulator but to no avail.
Can anybody help me figure out how do I enable internet on my android emulator?

I have Nexus 5X API 27 and target being Android 8.1 (Google Play)
and Nexus 5 API P and target being Android 7.1.1.

I believe there should be a way to enable internet on it or else the whole point of providing virtual wifi on the emulator seems to be waste.

I am on mac OS HS 10.13.4 directly connected to my router with no proxy.

I even tried deleting all the AVDs, re-installing them. I even tried having installed the latest Pixel 2 with Oreo Android 8.1

Nothing seems to be working. Has anybody faced this issue and found a solution?

Any help would be of great help

Thanks, 
Vikram

Update: When I connect my computer through my phone as hotspot wifi, the emulator has internet through wifi, but it fails when I connect my computer to my home router.

Android Studio - Android Emulator Wifi Connected with No Internet

I removed the emulator and reinstalled it and got the same error.

&gt; Emulator: emulator: ERROR: Running multiple emulators with the same AVD is an experimental feature.  
&gt; Emulator: Process finished with exit code 1.

Emulator: emulator: ERROR: Running multiple emulators with the same AVD is an experimental feature

I am trying to add Android Q using AVD manager but it says: &quot;Package &quot;Android Emulator&quot; with revision at least 28.1.9 not available.&quot; Has anyone tried this before? what should I do now to resolve this.

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/5c1q3.png

Package &quot;Android Emulator&quot; with revision at least 28.1.9 not available

```adb remount``` does not work correctly on api 29 when running from the emulator.  The command works fine on all other emulators that have been tried (18, 23, 25, 26, 27 and 28).

Any ideas why this might be?

```Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
W Disabling verity for /system
E Skipping /system
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
Skip mounting partition: /product
Skip mounting partition: /product_services
/system/bin/remount exited with status 7
remount failed

Is adb remount broken on android api 29?

Is there a way to remove the drop shadow under the app bar (AppBar class) when using a Scaffold widget in Flutter?

Removing the drop shadow from a Scaffold AppBar in Flutter?

How can i expand and collapse widget when user taps on different widget ( sibling or parent ) with animation ? 

    new Column(
        children: &lt;Widget&gt;[
            new header.IngridientHeader(
                new Icon(
                    Icons.fiber_manual_record,
                    color: AppColors.primaryColor
                ),
                &#39;Voice Track 1&#39;
            ),
            new Grid()
        ],
    )

I want user to be able to tap on header.IngridientHeader and then Grid widget should toggle ( hide if visible and other way around )

edit:

im trying to do something that in bootstrap is called Collapse. [getbootstrap.com/docs/4.0/components/collapse][1] 


  [1]: http://getbootstrap.com/docs/4.0/components/collapse

edit 2:
header.IngridientHeader should stay in place all the time
Grid() is scrollable ( horizontal ) widget.

how to animate collapse elements in flutter

This is what I&#39;m trying to make:

[![enter image description here][1]][1]

In the Flutter docs for Text Fields (https://flutter.io/text-input/) it says you can remove the underline by passing `null` to the decoration. However, that also gets rid of the hint text. 

I do not want any underline whether the text field is focused or not. 

**UPDATE:** updated accepted answer to reflect changes in Flutter SDK as of April 2020.


  [1]: https://i.stack.imgur.com/x266f.png

Flutter: how to make a TextField with HintText but no Underline?

I have a `Text widget` on pressing which another `Route` has to be shown. But I could not see any onPressed() method for the `Text widget`. Please Help.

How can I implement OnPressed callback for Text widget, Flutter

I installed Flutter SDK, following steps, provided from this link: [Install on macOS - iOS setup](https://flutter.io/setup-macos/).

But I am unable to create a new sample project in Xcode. I can&#39;t find a proper way to start a new project using Xcode.

Here are steps to start a new sample project but not for Xcode: Get [Started: Test Drive](https://flutter.io/get-started/test-drive/#create-app)

How to create a new Flutter project in Xcode?

I&#39;m using [Xcode 9.3 - beta 3](https://stackoverflow.com/questions/44390162/download-install-xcode-9-1-9-2-9-3-beta-or-xcode-9-version-without-premium-d/44390183#44390183)

Content Type	Original Author	Original Content on Stackoverflow
Question	Jigar Fumakiya	View Question on Stackoverflow
Solution 1 - Android	Michael Hathi	View Answer on Stackoverflow
Solution 2 - Android	Ali	View Answer on Stackoverflow
Solution 3 - Android	Mohammed Salim Al-Othman	View Answer on Stackoverflow
Solution 4 - Android	Ahmad Almosallam	View Answer on Stackoverflow

Flutter: iOS Emulator for Windows

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Solution 3 - Android

Solution 4 - Android

In JavaScript how do I/should I use async/await with XMLHttpRequest?

Airflow 1.9.0 is queuing but not launching tasks

Attributions