It&#39;s just Editor Preferences.

**Edit:**

This is moved to 

    Preferences -&gt; Editor -&gt; Color Scheme -&gt; Kotlin -&gt; Properties and Variables

[![enter image description here][1]][1]

Thanks rmirabelle for the comment

For the old plugin, you can go to 

    Preferences -&gt; Editor -&gt; Color Scheme -&gt; Kotlin

Then find `Var (mutable variable, parameter or property)` and remove Underscored effect.

I guess they just try to discourage using `var` by adding the annoying underscored. :P

[![old plugin][2]][2]


  [1]: http://i.stack.imgur.com/5AyzA.png
  [2]: http://i.stack.imgur.com/mtghs.png

In Android Studio 3.1.2 this has been moved to - 

`Settings &gt; Editor &gt; Color Scheme &gt; Kotlin`

[![enter image description here][1]][1]

  [1]: https://i.stack.imgur.com/2qWVB.png

I am trying to insert values in table. But there is only one value inserted. I am getting an error in log cat when I am trying to insert new values. 

Log cat shows :

    abort at 13 in [INSERT INTO event(totalminutesfrom,dayofweek,title,location,totalminutesto,id) VALUES (?,?,?,?,?,?)]: UNIQUE constraint failed: event.id
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase: Error inserting totalminutesfrom=694 dayofweek=null title=qxs location=Eded &amp; Mariz totalminutesto=0 id=0
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase: android.database.sqlite.SQLiteConstraintException: UNIQUE constraint failed: event.id (code 1555)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:782)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1471)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at com.example.siddhi.timetablelayout.EventTableHelper.addEvent(EventTableHelper.java:76)
    01-24 11:34:39.764 7763-7763/com.example.siddhi.timetablelayout E/SQLiteDatabase:     at com.example.siddhi.timetablelayout.AddEventActivity$5.onClick(AddEventActivity.java:217)


Its showing error on these two lines while inserting row.

    db.insert(TABLE, null, values);

       db.addEvent(new EventData(eventTitle,dayOfWeek,totalMinutesFrom, totalMinutesTo,location));



EventTableHelper


        
    public class EventTableHelper extends SQLiteOpenHelper {
    
    
        private static final String TABLE = &quot;event&quot;;
        private static final String KEY_ID = &quot;id&quot;;
        private static final String KEY_TITLE = &quot;title&quot;;
        private static final String KEY_LOCATION = &quot;location&quot;;
        private static final String KEY_DAY_OF_WEEK = &quot;dayofweek&quot;;
        private static final String KEY_TOTAL_MINUTES_FROM = &quot;totalminutesfrom&quot;;
        private static final String KEY_TOTAL_MINUTES_TO = &quot;totalminutesto&quot;;
    
    
    
        public EventTableHelper(Context context) {
            super(context, Constants.DATABASE_NAME, null, Constants.DATABASE_VERSION);
            //3rd argument to be passed is CursorFactory instance
        }
    
        // Creating Tables
        @Override
        public void onCreate(SQLiteDatabase db) {
            //createTable(db);
        }
    
        public void createTable(SQLiteDatabase db){
            String CREATE_EVENTS_TABLE = &quot;CREATE TABLE &quot; + TABLE + &quot;(&quot;
                    + KEY_ID + &quot; INTEGER PRIMARY KEY,&quot; + KEY_TITLE + &quot; TEXT,&quot;
                    + KEY_DAY_OF_WEEK +&quot;TEXT&quot; + KEY_TOTAL_MINUTES_FROM +&quot;INTEGER&quot;
                    + KEY_TOTAL_MINUTES_TO + &quot;INTEGER&quot; +  KEY_LOCATION + &quot;TEXT&quot; +  &quot;)&quot;;
    
            db.execSQL(CREATE_EVENTS_TABLE);
    
        }
        // Upgrading database
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // Drop older table if existed
           // db.execSQL(&quot;DROP TABLE IF EXISTS &quot; + TABLE);
    
          //  createTable(db);
    
            // Create tables again
            //onCreate(db);
        }
    
        // code to add the new contact
        public void addEvent(EventData event) {
            SQLiteDatabase db = this.getWritableDatabase();
    
            ContentValues values = new ContentValues();
            values.put(KEY_ID, event.getId());
            values.put(KEY_TITLE,event.getTitle()); // Contact Name
            values.put(KEY_DAY_OF_WEEK,event.getDayofWeek());
            values.put(KEY_TOTAL_MINUTES_FROM,event.getFromMinutes());
            values.put(KEY_TOTAL_MINUTES_TO,event.getToMinutes());
            values.put(KEY_LOCATION,event.getLocation());
            // Inserting Row
            db.insert(TABLE, null, values);
            //2nd argument is String containing nullColumnHack
            db.close(); // Closing database connection
        }
    
        // code to get the single contact
       EventData getEvent(int id) {
            SQLiteDatabase db = this.getReadableDatabase();
    
            Cursor cursor = db.query(TABLE, new String[] { KEY_ID,
                            KEY_TITLE, KEY_DAY_OF_WEEK, KEY_TOTAL_MINUTES_FROM,KEY_TOTAL_MINUTES_TO,KEY_LOCATION }, KEY_ID + &quot;=?&quot;,
                    new String[] { String.valueOf(id) }, null, null, null, null);
            if (cursor != null)
                cursor.moveToFirst();
           EventData eventData = new EventData(Integer.parseInt(cursor.getString(0)),cursor.getString(1), cursor.getString(2),
                   cursor.getInt(3),cursor.getInt(4),cursor.getString(5));
    
            return eventData;
        }
    
    
    
        // code to get all contacts in a list view
        public List&lt;EventData&gt; getAllEvents() {
            List&lt;EventData&gt; conList = new ArrayList&lt;EventData&gt;();
            // Select All Query
            String selectQuery = &quot;SELECT  * FROM &quot; + TABLE;
    
            SQLiteDatabase db = this.getWritableDatabase();
            Cursor cursor = db.rawQuery(selectQuery, null);
    
            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
                do {
    
                    EventData event = new EventData();
    
                    event.setId(Integer.parseInt(cursor.getString(0)));
                    event.setTitle(cursor.getString(1));
                    event.setDayofWeek(cursor.getString(2));
                    event.setFromMinutes(cursor.getInt(3));
                    event.setToMinutes(cursor.getInt(4));
                    event.setLocation(cursor.getString(5));
                    // Adding contact to list
                    conList.add(event);
                } while (cursor.moveToNext());
            }
    
            // return contact list
            return conList;
        }
    }

How to solve this??

UNIQUE constraint failed: sqlite database : android

I have this enum type:

    enum Animal {
        Dog(i32),
        Cat(u8),
    }

Now I have a function that takes this type as parameter. I *know* (for some reason) that the input is always a `Cat`. I want to achieve this:

    fn count_legs_of_cat(animal: Animal) -&gt; u8 {
        if let Animal::Cat(c) = animal { c } else { unreachable!() }
    }

Can I write this shorter and/or more idiomatic?

Unwrap inner type when enum variant is known

I wanted to know why most variables in Kotlin are underlined. Some files contain a lot of underlining which is very annoying. If I hover my mouse over a variable it doesn&#39;t give any information most of the time. But on some it says &quot;This property has a backing field&quot; or &quot;Value captured in a closure&quot;. Does anybody know how to disable those underlines? Here is a screenshot with what I mean:
[![enter image description here][1]][1]

And realm is then underlined throughout the entire file.


  [1]: http://i.stack.imgur.com/qUQMI.png

Kotlin: Why are most variables underlined in Android Studio and how do I turn that off?

<p>I wanted to know why most variables in Kotlin are underlined. Some files contain a lot of underlining which is very annoying. If I hover my mouse over a variable it doesn't give any information most of the time. But on some it says "This property has a backing field" or "Value captured in a closure". Does anybody know how to disable those underlines? Here is a screenshot with what I mean:
<a href="http://i.stack.imgur.com/qUQMI.png" target="_blank" rel="noopener noreferrer"><img src="http://i.stack.imgur.com/qUQMI.png" alt="enter image description here"></a></p>
<p>And realm is then underlined throughout the entire file.</p>


**Context:**

I&#39;m trying to set up Google Analytics for my app. (having 4 custom `buildTypes` and more than a few `productFlavors`)

It works fine when I select the `Build Variant` which has the `applicationId` set to `com.my.app.package.name` (the package name used when generating the `google-services.json`). But, my other flavors have different applicationIds.

I followed the [offical devguide][1] to set it up.

Error I get when any another build variant is selected in `Build Variants Tab` (which has a different `applicationId` (package name) is as follows:

&gt; Error:Execution failed for task
&gt; &#39;:app:processAllcategoriesDebugfreeGoogleServices&#39;.
&gt; &gt; No matching client found for package name &#39;com.my.app.package.name.debug&#39;

**Explanation of Error Message:** 

In the task name in the error message above `Debugfree` is my custom `buildType` and `Allcategories` is one of my `productFlavors`.

***I understand the error and know the package name is different from what i used when generating the json, but that is what I&#39;m trying to figure a way around.***

**Problem:**

Now, the `google-services.json` resides in the `app` folder and hence I am not being able to separate them out for each product flavor by dropping them in the flavor specific source set folder.

**Questions:**

1. My custom `byildType` for debugging suffixes `.debug` to the `applicationId` (package name). Is there a way I can make it work with the `google-services.json` which has my release `applicationId` (i.e. without the suffix `.debug`)
2. Is there a way to have multiple product flavors configured in the same `google-services.json` file without using separate files and tasks to copy the required file to `app` folder. I know it can be done using `task` as mentioned in [this post][2]. Is there a simpler way to just have one file or pick right file based on gradle configuration?
3. I see the `package_name` field in `google-services.json` has the package name `com.my.app.package.name`. Can I add multiple package names manually to work for all build variants? If yes, how to do that? Could not find any instructions in documentations.


  [1]: https://developers.google.com/analytics/devguides/collection/android/v4/
  [2]: https://stackoverflow.com/questions/30772201/google-services-json-for-different-productflavors

No matching client found for package name (Google Analytics) - multiple productFlavors &amp; buildTypes

I am new in Android Studio. After setup, 
When I am trying to import an application I am getting that error So that gradle not able to build.

**Error:Could not initialize class org.codehaus.groovy.runtime.InvokerHelper**

I checked that my classpath setting for Java is fine.  I am running Windows OS.  Does anyone know the source of the error?

Android Studio Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

I&#39;m getting the user&#39;s location through 

    Location location = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);

This line of code is inside a method and before calling this method I do check for Android run time permissions. Only if the permission is available from the user then I call this method. Code is working perfectly.

The problem is that Android Studio still shows an error on this line not recognising that I&#39;ve already checked before calling this function.

    Call requires permission which may be rejected by user: code should explicitly check to see if permission is available (with `checkPermission`) or explicitly handle a potential `SecurityException`
Now how do I remove this warning? I&#39;ve already checked for permissions and don&#39;t want  to check again just to remove this warning. I&#39;ve tried adding @SuppressWarnings() but don&#39;t know the exact String to pass into this.             **@SuppressWarnings({&quot;all&quot;})** works but it is obviously not recommended.

How do I remove this warning? 

**EDIT 1 :** This is my exact code -

    private void checkPermissions() {
        if (ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED)
            getLocation();  //Method called if I have permission
    }

    private void getLocation() {
        //Android studio shows warning at this line.
        Location location = LocationServices.FusedLocationApi.getLastLocation(
                mGoogleApiClient);
    }

But if I put the permission check inside getLocation() method then the warning disappears. **@SuppressWarnings({&quot;MissingPermission&quot;})** did not work.

**EDIT 2:** I&#39;ve discovered that the only way to suppress the warning are - 

Adding this comment on top of that particular piece of code - 

    //noinspection ResourceType

or adding this - 

    @SuppressWarnings({&quot;ResourceType&quot;})

Android Studio - remove Security Exception warning

How to disable Instant Run in Android Studio 2.0 Preview. When I go to the settings I see it:

[![enter image description here][1]][1]

and I can not remove the tick from &quot;Enable Instant Run...&quot;

I use Android Studio 2.0 Preview 9, but this error was present in Android Studio 2.0 Preview 7 also.


  [1]: http://i.stack.imgur.com/jhRjr.png

Instant run in Android Studio 2.0 (how to turn off)

I am able to build the app properly, but when I run it I get this error: 

    This version of android studio is incompatible with the gradle version used.Try disabling the instant run

This version of android studio is incompatible with the gradle version used.Try disabling the instant run

I&#39;m writing documents that should explain code in C# using Markdown.

I use the ` ```csharp` to get csharp highlighting.

I sometimes want to highlight something specific in the code using bold or anything.

I know about `&lt;pre&gt;` etc... but it takes away my csharp highlighting.

Best case scenario - some way to highlight code in the ` ```csharp` section.

Next best thing - I can write the code as diff - using + and - to highlight stuff, but how do I tell Github to highlight diff syntax with the red and green backcolor?

Is there a way to use both diff and csharp syntax highlighting?

Diff syntax highlighting in Github Markdown

I&#39;m started writing some basic React code in sublime text. Here is what my syntax highlighting looks like. Its partly highlighted. Is there any suggested sublime plugin i can use to see a complete syntax highlight?

[![enter image description here][1]][1]


  [1]: https://i.stack.imgur.com/yZ4ls.png



    import React, { Component } from &#39;react&#39;
    import { connect } from &#39;react-redux&#39;	// &lt;-- is the glue between react and redux
    import { bindActionCreators } from &#39;redux&#39;
    import { selectBook } from &#39;../actions/index&#39;
    
    // there is no intrinsic connection between React and Redux
    // they are two seperate libraries
    // they are connected using a seperate library called ReactRedux
    
    // container? its a React component that hasa direct connection to state managed by Redux
    class BookList extends Component {
    
    	constructor(props) {
    		super(props)
    		//this.props = props;
    	}
    
    	renderList() {
    		return this.props.books.map((book) =&gt; {
    			return (
    				&lt;li key={book.title} className=&quot;list-group-item&quot;&gt;{book.title}&lt;/li&gt;
    			)
    		})
    	}
    
    	render() {
    		return (
    			&lt;ul className=&quot;list-group col-sm-4&quot;&gt;
    				{this.renderList()}
    			&lt;/ul&gt;
    		)
    	}
    
    }
    
    // function is the glue between react and redux
    function mapStateToProps(state) {
    	// Whatever gets retrieved from here will show up as props inside
    	// of book-list
    
    	return {
    		books: state.books
    	}
    }
    
    // anything returned from this function will end up as props on the BookList container
    function mapDispatchToProps(dispatch) {
    	return bindActionCreators({selectBook: selectBook}, dispatch)
    }
    
    // Promote BookList from a component to a container - it needs to know
    // about this new dispatch method, selectBook. Make it available as a prop
    export default connect(mapStateToProps, mapDispatchToProps)(BookList);

EDIT: [Fixed some incorrect syntax, Added code text]

syntax highlighting for react code in sublime

I&#39;m using Sublime 3 editor. When I open a SCSS file it shows many red characters because it misjudged the syntax. When I press &lt;kbd&gt;CTRL&lt;/kbd&gt; + &lt;kbd&gt;Shift&lt;/kbd&gt; + &lt;kbd&gt;P&lt;/kbd&gt; and type `sass` or `scss` I get no option. I had to set syntax to CSS.  

Is there any way to set syntax to SCSS in Sublime 3?

How to set scss syntax in Sublime 3?

We already tried the approaches as listed below:

 - https://github.com/oliverlockwood/jenkinsfile-idea-plugin
 - https://st-g.de/2016/08/jenkins-pipeline-autocompletion-in-intellij

After having searched the web for many hours on multiple days, we still haven&#39;t found a helpful resource on this matter. Thus, it appears to make sense to ask a new question here.

We are developing our Java projects in IntelliJ idea and want to integrate our builds with Jenkins. When we create a Jenkinsfile in Idea, we do not get syntax highlighting or auto completion. Since we are new to Jenkins, those features would be really useful to us. How can we make Idea be more supportive with Jenkinsfiles?

If there is no way to get syntax highlighting and auto completion for a Jenkinsfile in idea, what other editors would be helpful?

Please note: 

 - we are working with java projects, not groovy projects.
 - We&#39;ve already tried the plugin https://github.com/oliverlockwood/jenkinsfile-idea-plugin. When the plugin is activated, the Jenkinsfile is recognized as such, but instead of syntax highlighting we get an error message, please see below.

        pipeline {
        agent { docker &#39;maven:3.3.3&#39; }
        stages {
            stage(&#39;build&#39;) {
                steps {
                    sh &#39;echo Hello, World!&#39;
                }
            }
          }
        }
Idea highlights the `p` of `pipeline` as error. The error message reads:

    JenkinsTokenType.COMMENT, JenkinsTokenType.CRLF or JenkinsTokenType.STEP_KEY expected, got &#39;p&#39;

Thanks for any help!

Jenkinsfile syntax highlighting in Java project using Intellij Idea

How can I create a Array like we do in java?

    int A[] = new int[N];

How can I do this in Kotlin?

How can I create an array in Kotlin like in Java by just providing a size?

Given some arrays in Kotlin

&lt;!-- language: lang-kotlin --&gt;

    let a = arrayOf(&quot;first&quot;, &quot;second&quot;)
    val b = arrayOf(&quot;first&quot;, &quot;second&quot;)
    val c = arrayOf(&quot;1st&quot;, &quot;2nd&quot;)

Are there built-in functions to the Kotlin std-lib that tests two arrays for (value) equality for each element?

Thus resulting in:

&lt;!-- language: lang-kotlin --&gt;

    a.equals(b) // true
    a.equals(c) // false

`equals()` is actually returning `false` in both cases, but maybe there are built-in functions to Kotlin that one could use?

There is the static function `java.utils.Arrays.deepEquals(a.toTypedArray(), b.toTypedArray())` but I would rather prefer an instance method as it would work better with optionals.


How to compare two arrays in Kotlin?

In Kotlin, a function with at least one argument can be defined either as a regular non-member function or as an [extension function][1] with one argument being a receiver.

As to the scoping, there seems to be no difference: both can be declared inside or outside classes and other functions, and both can or cannot have visibility modifiers equally.

Language reference seems not to recommend using regular functions or extension functions for different situations.

So, my question is: **when do extension functions give advantage over regular non-member ones?** And when regular ones over extensions?

`foo.bar(baz, baq)` vs `bar(foo, baz, baq)`.

Is it just a hint of a function semantics (receiver is definitely in focus) or are there cases when using extensions functions makes code much cleaner or opens up opportunities?


  [1]: https://kotlinlang.org/docs/reference/extensions.html#extension-functions

When should one prefer Kotlin extension functions?

I want to invoke an external command from Kotlin code.

* In C/Perl, I would use the `system()` function.
* In Python, I would use the subprocess module.
* In Go, I would use os/exec, and etc.

But how do I do this in Kotlin?

How to invoke external command from within Kotlin code?

I can&#39;t seem to find this question yet, but what is the simplest, most-idiomatic way of opening/creating a file, writing to it, and then closing it? Looking at the [kotlin.io](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/index.html) reference and the Java documentation I managed to get this:

    fun write() {
        val writer = PrintWriter(&quot;file.txt&quot;)  // java.io.PrintWriter

        for ((member, originalInput) in history) {  // history: Map&lt;Member, String&gt;
            writer.append(&quot;$member, $originalInput\n&quot;)
        }

        writer.close()
    }

This works, but I was wondering if there was a &quot;proper&quot; Kotlin way of doing this?

Content Type	Original Author	Original Content on Stackoverflow
Question	Kevin van Mierlo	View Question on Stackoverflow
Solution 1 - Android Studio	pt2121	View Answer on Stackoverflow
Solution 2 - Android Studio	Hrishikesh Kadam	View Answer on Stackoverflow

Kotlin: Why are most variables underlined in Android Studio and how do I turn that off?

Android Studio Problem Overview

Android Studio Solutions

Solution 1 - Android Studio

Solution 2 - Android Studio

Unwrap inner type when enum variant is known

UNIQUE constraint failed: sqlite database : android

Attributions