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How to pass a String from one Activity to another Activity in Android using Kotlin?
This example demonstrates how to pass a String from one Activity to another Activity in Android using Kotlin.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/relativeLayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="70dp" android:background="#008080" android:padding="5dp" android:text="TutorialsPoint" android:textColor="#fff" android:textSize="24sp" android:textStyle="bold" /> <Button android:id="@+id/newActivityBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="Pass message to New Activity" /> <EditText android:id="@+id/etMessage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_above="@+id/newActivityBtn" android:layout_alignParentStart="true" android:layout_alignParentEnd="true" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
lateinit var changeActivityButton: Button
lateinit var messageEditText: EditText
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp"
messageEditText = findViewById(R.id.etMessage)
changeActivityButton = findViewById(R.id.newActivityBtn)
changeActivityButton.setOnClickListener {
val intent = Intent(this@MainActivity, NewActivity::class.java)
val message = messageEditText.text.toString()
intent.putExtra("message_key", message)
startActivity(intent)
}
}
}Step 4 − Create a new activity and add the following code −
NewActivity.kt
import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
class NewActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_new)
title = "KotlinApp"
val message = intent.getStringExtra("message_key")
val messageTextView: TextView = findViewById(R.id.textView)
messageTextView.text = message
}
}activity_new.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/relativeLayout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="70dp" android:background="#008080" android:padding="5dp" android:text="TutorialsPoint" android:textColor="#fff" android:textSize="24sp" android:textStyle="bold" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/text2" android:layout_centerInParent="true" android:layout_marginTop="50dp" android:text="New Activity" android:textColor="@android:color/holo_red_light" android:textStyle="bold" /> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:layout_centerHorizontal="true" android:text="New Text" android:textColor="@android:color/holo_orange_dark" android:textSize="32sp" android:textStyle="bold|italic" /> </RelativeLayout>
Step 5 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon
from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen.
Updated on: 30-Nov-2020
2K+ Views
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