'How to create a button in Kotlin that opens a new activity (Android Studio)?

Hello I'm making an app using Android Studio and the Kotlin language and am having trouble getting my button to open a new activity. I have the button created in my xml file but I can't find the KOTLIN syntax of how to declare it in MainActivity.kt and how to create the OnClicklistener that would take me to the new activity. I have the new activity defined in the manifest as well I think I just need syntax help on how to actually switch from MainActivity.kt to secondActivity.kt. Any help is appreciated.

Solution 1:^[1]

You can add onclick event listener like below.

 button1.setOnClickListener(object: View.OnClickListener {
    override fun onClick(view: View): Unit {
        // Handler code here.
        val intent = Intent(context, DestActivity::class.java);
        startActivity(intent);
    }
})

Or you can use simplified form

   button1.setOnClickListener {
    // Handler code here.
    val intent = Intent(context, DestActivity::class.java)
    startActivity(intent);
   }

Solution 2:^[2]

Button in layout xml file

        <Button
            android:id="@+id/btn_start_new_activity"
            android:text="New Activity"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

For declaring it in the Kotlin Activity file

var btn_new_activity = findViewById(R.id.btn_start_new_activity) as Button

Set Onclicklistener to the button, to start new activity when button is clicked

    btn_new_activity.setOnClickListener {
        val intent = Intent(context, NewActivity::class.java)
        startActivity(intent);
    }

Reference: Android Studio Tutorial - https://www.youtube.com/watch?v=7AcIGyugR7M

Solution 3:^[3]

I recommend you use the Anko - extension for Kotlin https://github.com/Kotlin/anko. It let you use intent(and more other things) the shortest way. In your case it`ll be:

button {
        onClick { startActivity<SecondActivity>() }
    }

Solution 4:^[4]

// In your method `fun onCreate(savedInstanceState: Bundle?)` add this.

    your_btn_id.setOnClickListener{

                val intent = Intent(this, yourpagename::class.java)
                startActivity(intent)
            }

// till now if it doesn't work then, check if these two files are added or not,

    import android.content.Intent
    import kotlinx.android.synthetic.main.activity_otp.*

// Hope that it would work. ?

Solution 5:^[5]

You can create a generic method to launch any Activity

  inline fun<reified T> launchActivity(){
    val intent = Intent(this, T::class.java)
    startActivity(intent)
}

And can be use like

 button1.setOnClickListener {
      launchActivity<AnyActivity>()
}

To get More details about reified Go to Here

Solution 6:^[6]

You can simply declare your button in the main activity as below:

val button = findViewById<Button>(R.id.button)
        button.setOnClickListener(this);

And in the clicklistener start the new activity:

override fun onClick(p0: View?) {
        val intent = Intent(this, activity::class.java)
        startActivity(intent)
    }

Solution 7:^[7]

I had to add first id 'kotlin-android-extensions' inside of plugins in build.gradle. after that in OnCreate Button.setOnClickListener { }

Solution 8:^[8]

Kotlin

Make sure the item is inside the OnCreate method. Edit the XML file (res/layout folder) and create button:

<Button
    android:id="@+id/button"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="Press me"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_marginStart="40dp"
    android:layout_marginEnd="40dp"
    android:layout_marginBottom="40dp"
    />

Next is main activity class:

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val button: Button = findViewById(R.id.button)
        button.setOnClickListener {
           
           val intent = Intent(context, NewActivity::class.java)
           startActivity(intent);
        }
    }
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1
Solution 2
Solution 3	Kirill Bitkov
Solution 4	Raghib Arshi
Solution 5
Solution 6	Nikitha
Solution 7	Irving Alan Medina Juarez
Solution 8

'How to create a button in Kotlin that opens a new activity (Android Studio)?

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