How to start new activity on button click

Question

In an Android application, how do you start a new activity (GUI) when a button in another activity is clicked, and how do you pass data between these two activities?

Answer 1

// In Kotlin , you can do as /* In First Activity, let in activity layout there is button which has id as button. Suppose I have to pass data as String type from one activity to another */

     val btn = findViewById(R.id.button)
     btn.setOnClickListener {
        val intent = Intent(baseContext, SecondActivity::class.java).apply {
             putExtra("KEY", data)
        }
        startActivity(intent)
     }

// In Second Activity, you can get data from another activity as

 val name = intent.getStringExtra("KEY")

/* Suppose you have to pass a Custom Object then it should be Parcelable. let there is class Collage type which I have to pass from one activity to another */

import android.os.Parcelable
import kotlinx.android.parcel.Parcelize

@Parcelize
class Collage(val name: String, val mobile: String, val email: String) : Parcelable

/* Activity First , let here data is Collage type. which I have to pass to another activity. */

val btn = findViewById(R.id.button)
         btn.setOnClickListener {
            val intent = Intent(baseContext, SecondActivity::class.java).apply {
                 putExtra("KEY", data)
            }
            startActivity(intent)
         }

// then from second Activity we will get as

val item = intent.extras?.getParcelable("KEY")