Data Passing between Activities Using Intent

activit_main.xml

<?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"
    android:orientation='vertical'>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Explicit Project Example"
         />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Move to next" />


</LinearLayout>

MainActivity.kt

package com.androidina.explicit

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

class MainActivity : AppCompatActivity() {

    var button: Button?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button=findViewById(R.id.button)

        button!!.setOnClickListener {
            var intent = Intent(applicationContext,Second::class.java)
            intent!!.putExtra("Name","Raj")
            intent!!.putExtra("mobile","900020")
                    startActivity(intent)
        }
    }
}

Second.kt

package com.androidina.explicit

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

class Second : AppCompatActivity() {

    var button:Button?=null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)

        button=findViewById(R.id.button2)

        var dataintent=intent
        var s1=dataintent.getStringExtra("Name")
        var s2=dataintent.getStringExtra("mobile")

        Toast.makeText(applicationContext, s1+s2,Toast.LENGTH_LONG).show()

        button!!.setOnClickListener{
            var intent= Intent(applicationContext, Third::class.java)
            intent!!.putExtra("data",s1+s2)
            startActivity(intent)
            //finish()
        }
    }
}

activit_second.xml

<?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=".Second"
    android:orientation='vertical'>

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="We are in Second Page"
        />

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />
</LinearLayout>

Third.kt

package com.androidina.explicit

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

class Third : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_third)


        var dataintent=intent
        var s1=dataintent.getStringExtra("data")

        Toast.makeText(applicationContext, s1, Toast.LENGTH_LONG).show()

    }

    override fun onBackPressed() {
        super.onBackPressed()
        var intent = Intent(applicationContext,MainActivity::class.java)
        startActivity(intent)
    }
}

activity_third.xml

<?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=".Third">

</androidx.constraintlayout.widget.ConstraintLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.Explicit"
        tools:targetApi="31">
        <activity
            android:name=".Third"
            android:exported="false" />
        <activity
            android:name=".Second"
            android:exported="false" />
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>