Android - How to achieve setOnClickListener in Kotlin

Question

I wanted to know that how we set basic onClickListener in Kotlin for Android Development

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Button OnClickListener implementation from function in android using kotlin  Very First Create Button View From  xml File                lt Button                 android id  quot   id btn2 quot                  android layout width  quot match parent quot                  android layout height  quot match parent quot                  android text  quot Button2 quot                  android layout weight  quot 0 5 quot   gt      and create button instance in Activity  private var btn1 Button  null  or   For Late Initialization can Follow like this  private lateinit var btn1 Button    in onCreate   btn1 findViewById R id btn1  as Button       btn1  setOnClickListener   btn1Click        implementing button OnClick event from Function   private fun btn1Click             Toast makeText this   quot button1 quot   Toast LENGTH LONG  show

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button setOnClickListener               write your code here

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Use below code  val textview   findViewById lt TextView gt  R id textview  textview setOnClickListener clickListener   val button   findViewById lt Button gt  R id button  button setOnClickListener clickListener    clickListener code   val clickListener   View OnClickListener  view - gt       when  view getId              R id textview - gt  firstFun           R id button - gt  secondFun

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A simple way would be to register a click listener and create a click listener with a lambda expression   override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      setContentView R layout activity main          click listener registered     myButton setOnClickListener clickListener      And implement the clickListener   private val clickListener  View OnClickListener   View OnClickListener     - gt         do something here     You can replace   with a name if you need the view to use it  For example  you need to check the id of click listener   private val clickListener  View OnClickListener   View OnClickListener   view - gt      if view id    login id               do something here

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First you have to get the reference to the View  say Button  TextView  etc   and set an OnClickListener to the reference using setOnClickListener   method     get reference to button val btn click me   findViewById R id btn click me  as Button    set on-click listener btn click me setOnClickListener       Toast makeText this MainActivity   You clicked me    Toast LENGTH SHORT  show       Refer Kotlin SetOnClickListener Example for complete Kotlin Android Example where a button is present in an activity and OnclickListener is applied to the button  When you click on the button  the code inside SetOnClickListener block is executed   Update  Now you can reference the button directly with its id by including the following import statement in Class file  Documentation   import kotlinx android synthetic main activity main     and then for the button  btn click me setOnClickListener          statements to run when button is clicked     Refer Android Studio Tutorial

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Add clickListener on button like this      btUpdate setOnClickListener onclickListener    add this code in your activity   val onclickListener  View OnClickListener   View OnClickListener   view - gt          when  view id                R id btUpdate - gt  updateData

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var tv   findViewById R id tv  as TextView      tv setOnClickListener          val i   Intent this MainActivity  SecondActivity  class java         startActivity i         finish

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Suppose you have textView to click  text view text    Hello Kotlin    text view setOnClickListener       val intent   Intent this MainActivity  SecondActivity  class java      intent putExtra  key    Kotlin       startActivity intent

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findViewById lt Button gt  R id signUp   setOnClickListener      Toast makeText mActivity   Button Clicked   Toast LENGTH LONG  show

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Here s the solution  Your code will like this       button setOnClickListener                 your code here             No need to add anything  like below   val button   findViewById lt Button gt  R id Button  button setOnClickListener

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There are several different ways to achieve this  as shown by the variety of answers on this question   To actually assign the listener to the view  you use the same methods as you would in Java   button setOnClickListener     However  Kotlin makes it easy to assign a lambda as a listener   button onSetClickListener          Listener code     Alternatively  if you want to use this listener for multiple views  consider a lambda expression  a lambda assigned to a variable value for reference    val buttonClickListener   View OnClickListener   view - gt         Listener code    button setOnClickListener buttonClickListener  another button setOnClickListener buttonClickListener

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Use this code to add onClickListener in Kotlin  val button   Button   getView    findViewById lt Button gt  R id testButton  as Button button setOnClickListener  view - gt           Toast makeText context   Write your message here   Toast LENGTH LONG  show

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The easiest way that I know to achieve that is through Kotlin Android Extensions   On your app build gradle   apply plugin   kotlin-android-extensions   If your button is called  btnAdd   then on your fragment or activity import the following   import kotlinx android synthetic main fragment transactions btnAdd   override fun onViewCreated view  View   savedInstanceState  Bundle         super onViewCreated view  savedInstanceState       btnAdd setOnClickListener           Toast makeText context    Done   10  show

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You can use setOnClickListener like this in Kotlin  button setOnClickListener View OnClickListener                    code

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First find the button  to prevent the cast from the View you can use the  lt  gt  as follows    val button   findViewById lt Button gt  R id button     Once you have an instance of the Button  you can now attach the click listener as follows    button setOnClickListener         You code here

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Method 1  txtNext setOnClickListener             Code statements        Method 2  class FirstActivity   AppCompatActivity    View OnClickListener    override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      setContentView R layout activity first      txtNext setOnClickListener this     override fun onClick v  View        when  v id            R id txtNext - gt                  Code statements                   else - gt                   else condition

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Simply do as below    button setOnClickListener doSomething

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For using multiple ids   textview1 setOnClickListener clickListener  textview2 setOnClickListener clickListener    Create anonymous class    private val clickListener  View OnClickListener   View OnClickListener   view - gt      when  view id            R id textview1- gt                Toast makeText this   Clicked 1   Toast LENGTH SHORT  show                     R id textview2- gt                Toast makeText this   Clicked 2   Toast LENGTH SHORT  show

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Here is an example on how to use the onClickListener in Kotlin  button1 setOnClickListener object   View OnClickListener              override fun onClick v  View                       Your code here

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In case anyone else wants to achieve this while using binding  If the id of your view is button save then this code can be written  taking advantage of the kotlin apply syntax binding apply            button save setOnClickListener                  dosomething                    Take note binding is the name of the binding instance created for an xml file   Full code is below if you are writing the code in fragment  Activity works similarly  private lateinit var binding  FragmentProfileBinding    override fun onCreateView      inflater  LayoutInflater  container  ViewGroup       savedInstanceState  Bundle     View           Inflate the layout for this fragment     binding   FragmentProfileBinding inflate inflater  container  false      return binding root       onActivityCreated is deprecated in fragment override fun onViewCreated view  View  savedInstanceState  Bundle         super onViewCreated view  savedInstanceState     binding apply        button save setOnClickListener              dosomething

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val button   findViewById lt Button gt  R id button      button setOnClickListener           val intent        Intent this MainActivity ThirdActivity  class java          intent putExtra  key    Kotlin           startActivity intent

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If you want to simulate the old anonymous way in Kotlin I found this worked perfectly    btnNewWay   setOnClickListener object View OnClickListener       override fun onClick v  View               Your Code Here

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I see a lot of suggestions here  but this collection is missing the following   button setOnClickListener   onButtonClicked    and in the current class we have a method like this   private fun onButtonClicked view  View            do stuff

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val saveButton Button   findViewById R id button save   saveButton setOnClickListener     write code for click event    with view object saveButton setOnClickListener  view - gt     write code for click event

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Add in build gradle module file android               buildFeatures           viewBinding true          For Activity add private lateinit var binding  ResultProfileBinding override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      binding   ResultProfileBinding inflate layoutInflater      val view   binding root     setContentView view     Add on click binding button setOnClickListener   Log d  quot TAG quot    quot Example quot

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There are five ways to use SetOnClickListener   First   button setOnClickListener          Do some work here     Second   button setOnClickListener object   View OnClickListener       override fun onClick view  View                Do some work here             Third   button setOnClickListener View OnClickListener   view - gt         Do some work here      Forth   class MainActivity   AppCompatActivity    View OnClickListener       lateinit var button   Button      override fun onCreate savedInstanceState  Bundle             super onCreate savedInstanceState          setContentView R layout activity main          button   findViewById R id button1          button setOnClickListener this             override fun onClick view  View             when view  id               R id button1- gt                      do some work here                                   Fifth   class MainActivity   AppCompatActivity         lateinit var button   Button      override fun onCreate savedInstanceState  Bundle             super onCreate savedInstanceState          setContentView R layout activity main          button   findViewById R id button1          button setOnClickListener listener             val listener  View OnClickListener   view - gt          when  view getId                  R id button1 - gt                       Do some work here                                   Cheers

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i have use kotlin-extension so i can access directly by button id      btnSignIN setOnClickListener               if  AppUtils isNetworkAvailable activity as BaseActivity                     if  checkValidation                           hitApiLogin

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Simply you can get OnClickListener in kotlin  view1 setOnClickListener     body

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You use like that onclickListener in kotlin  val fab   findViewById R id fab  as FloatingActionButton fab setOnClickListener

[android] Android - How to achieve setOnClickListener in Kotlin?

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