According to the [api-doc][1]:

    val list = arrayListOf&lt;Int&gt;()

This is also mentioned here: [How to initialize List&lt;T&gt; in Kotlin?
][2].

  [1]: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/array-list-of.html
  [2]: https://stackoverflow.com/questions/36896801/how-to-initialize-listt-in-kotlin#36897638

I suggest you write 

    var myList: ArrayList&lt;Int&gt; = arrayListOf()

When I have hidden files, like *dotfiles* or a `.git` directory: 
How can I list those files and directories in Powershell?

Neither `Get-ChildItem`, `dir` nor `ls` seem to show them.

How to show hidden files (dotfiles) with windows powershell

 The flutter **app name** is shown by the **package name**, the **AppBar title** is shown on the **AppBar of the home page**, so where does the title `MaterialApp(title: &#39;Rectangle App&#39;,);` is used in flutter projects.

    

   
    import &#39;package:flutter/material.dart&#39;;
    
    void main() =&gt; runApp(new MyApp());
    
    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return new MaterialApp(
          debugShowCheckedModeBanner: false,
          title: &#39;Rectangle App&#39;,
          home: Scaffold(
            appBar: AppBar(
              title: Text(&#39;Rectangle App Home Page&#39;),
            ),
            body: HelloRectangle(),
          ),
        );
      }
    }



Flutter : Where is the title of Material App used?

I have an empty array list:

    var mylist: ArrayList&lt;Int&gt; = ArrayList()

When I want to set value in it I got this error:

    java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0

The question is: How can I initialize my list?

How to initialize an empty array list in Kotlin?

I have an empty array list:
<pre><code class="hljs language-css">var mylist: ArrayList&#x3C;Int> = ArrayList()
</code></pre>
When I want to set value in it I got this error:
<pre><code class="hljs language-arduino">java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
</code></pre>
The question is: How can I initialize my list?

I am having an issue with the new Android Navigation Architecture component when I try to navigate from **one Fragment to another**, I get this weird error: 

    java.lang.IllegalArgumentException: navigation destination XXX
    is unknown to this NavController

Every other navigation works fine except this particular one.

I use `findNavController()` function of Fragment to get access to the `NavController`.

Any help will be appreciated.

IllegalArgumentException: navigation destination xxx is unknown to this NavController

I want to print 0001 (note the 3 preceding 0s), and incremental 1 at a time, and reach 1000 to stop. How could I do that in Kotlin without complex appending the 0s myself? 

The below is not helping as it will not have preceding 0s.

    for (i in 1..1000) print(i)

Print 0001 to 1000 in Kotlin. How to add padding to numbers?

How I can initialize **MutableLiveData** with initial value?
I&#39;m looking for something like:

`val text = MutableLiveData&lt;String&gt;(&quot;initial value&quot;)`

MutableLiveData with initial value

I&#39;ve got a gradle FAILURE:

    ...&quot;Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.&quot;

Case description:

- Attached to the project codebase the next libs:

**APP/build.gradle**

        //(Required) Writing and executing Unit Tests on the JUnit Platform 
    testImplementation &quot;org.junit.jupiter:junit-jupiter-api:5.2.0&quot;
    testRuntimeOnly &quot;org.junit.jupiter:junit-jupiter-engine:5.2.0&quot;
        // (Optional) If you need &quot;Parameterized Tests&quot;
    testImplementation &quot;org.junit.jupiter:junit-jupiter-params:5.2.0&quot;
        // (Optional) If you also have JUnit 4-based tests
    testImplementation &quot;junit:junit:4.12&quot;
    testRuntimeOnly &quot;org.junit.vintage:junit-vintage-engine:5.2.0&quot;

    testImplementation &quot;io.mockk:mockk:1.8.5&quot;

- Updated the **gradle-wrapper.properties**

    distributionUrl=https\....gradle-**4.4-all**.zip to **4.7-all**

 
- after all of that gradle was built success

- created the test calss

        @TestInstance(TestInstance.Lifecycle.PER_CLASS)
          class TestClass {
    
          @Test
          internal fun testName() {
            Assert.assertEquals(2, 1 + 1)
          }
        }


- ran the test and got the FAILURE message.
[![enter image description here][1]][1]
 

- ran the Gradle build with a command line argument `./gradlew --warning-mode=all` to see what exactly the deprecated features are.
[![enter image description here][2]][2]

As a result I couldn&#39;t build the app and I&#39;ve got that FAILURE: message.


  [1]: https://i.stack.imgur.com/7nZ04.png
  [2]: https://i.stack.imgur.com/TxV5L.png

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0

I want to know how to create a singleton class in Kotlin, so that my Util class instantiates it only once per app execution. However, when I converted my Java class to kotlin, the code below was generated. 

**Is this correct?**


    companion object {
        private var utilProject: UtilProject? = null

        val instance: UtilProject
            get() {
                if (utilProject == null) utilProject = UtilProject()
                return utilProject!!
            }
    } 

I could find a related **[question][1]**, but it is with parameters, and I am not getting it convert without params.


  [1]: https://stackoverflow.com/q/40398072/6891563

Content Type	Original Author	Original Content on Stackoverflow
Question	SadeQ digitALLife	View Question on Stackoverflow
Solution 1 - Arraylist	LuCio	View Answer on Stackoverflow
Solution 2 - Arraylist	Szymon Chaber	View Answer on Stackoverflow

How to initialize an empty array list in Kotlin?

Arraylist Problem Overview

Arraylist Solutions

Solution 1 - Arraylist

Solution 2 - Arraylist

Flutter : Where is the title of Material App used?

How to show hidden files (dotfiles) with windows powershell

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