Pass Data From One Activity To Another Activity - Android Studio - Kotlin

In this example, we will pass data from one activity to another activity. See the following example:

activity_main.xml

Add the following code in the activity_main.xml file.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

         <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:gravity="center"
            android:layout_margin="10dp"
            android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="First Activity"
            android:gravity="center"
            android:layout_gravity="top"
            android:textSize="30dp"
            android:padding="5dp"
            android:background="#8BC34A"
            android:textColor="#000000"/>


        <EditText
            android:id="@+id/edt_first_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Enter First Name"/>

        <EditText
            android:id="@+id/edt_Second_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Enter Second Name"/>

        <Button
            android:id="@+id/btn_click_to_send"
            android:layout_marginTop="10dp"
            android:background="@color/colorAccent"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAllCaps="false"
            android:text="Click To Send"/>
    </LinearLayout>
    </ScrollView>
</LinearLayout>

MainActivity.kt
Add the following code in the MainActivity.kt class.
package com.study.kotlinkatta

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.Toast

class MainActivity : AppCompatActivity() {

    lateinit var edt_first_name: EditText
    lateinit var edt_Second_name: EditText
    lateinit var btn_click_to_send: Button

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

        edt_first_name =findViewById(R.id.edt_first_name)
        edt_Second_name =findViewById(R.id.edt_Second_name)
        btn_click_to_send =findViewById(R.id.btn_click_to_send)

        btn_click_to_send.setOnClickListener {
            var str_first_name = edt_first_name.text.toString()
            var str_second_name = edt_Second_name.text.toString()

            if(str_first_name.equals("") && str_second_name.equals("")) {
                Toast.makeText(applicationContext,"Please Enter Details",Toast.LENGTH_SHORT).show()
            }else{
                val intent = Intent(this, SecondActivity::class.java)
                intent.putExtra("intent_first_name", str_first_name)
                intent.putExtra("intent_second_name", str_second_name)
                startActivity(intent)
            }
        }
    }
}
activity_second.xml
Add the following code in the activity_second.xml file.
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SecondActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="center"
        android:layout_margin="10dp"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Second Activity"
            android:gravity="center"
            android:layout_gravity="top"
            android:textSize="30dp"
            android:padding="5dp"
            android:background="#8BC34A"
            android:textColor="#000000"
            android:layout_marginBottom="10dp"/>

        <TextView
            android:id="@+id/txt_first_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20dp"/>

        <TextView
            android:id="@+id/txt_Second_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20dp"/>

    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
SecondActivity.kt
Add the following code in the SecondActivity.kt class.
package com.study.kotlinkatta

import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity

class SecondActivity : AppCompatActivity() {

    lateinit var txt_first_name: TextView
    lateinit var txt_Second_name: TextView
    var str_first_name = ""
    var str_second_name = ""

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

        val i = intent
        val bd = i.extras
        if (bd != null) {
            str_first_name = bd.getString("intent_first_name")!!
            str_second_name = bd.getString("intent_second_name")!!
        }

        txt_first_name = findViewById(R.id.txt_first_name)
        txt_Second_name = findViewById(R.id.txt_Second_name)

        txt_first_name.setText("First Name: "+ str_first_name)
        txt_Second_name.setText("Second Name: "+ str_second_name)

    }
}
Output: