How to start a new activity by clicking a button on Android using Kotlin?

This example demonstrates how to start new activity on click button on 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"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="4dp">
   <TextView
      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/button"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:background="@android:color/background_dark"
      android:padding="4dp"
      android:text="Open New Activity"
      android:textColor="@color/colorAccent"
      android:textSize="32sp"
      android:textStyle="bold" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.kt

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
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(this, SecondActivity::class.java)
         startActivity(intent)
      }
   }
}

Step 4 − Create a new activity and add the following code −

activity_second.xml −

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:padding="4dp"
   android:layout_height="match_parent">
   <TextView
      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:id="@+id/textView"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Welcome to Second Activity"
      android:textAlignment="center"
      android:textColor="@android:color/holo_blue_dark"
      android:textSize="24sp"
      android:textStyle="bold" />
</RelativeLayout>

SecondActivity.kt

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
class SecondActivity : AppCompatActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_second)
   }
}

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.

Click here to download the project code.

Azhar

Updated on 28-Nov-2020 12:30:51

• Related Questions & Answers
• How to start new Activity on click button in Android?
• How to hide a soft keyboard on android after clicking outside EditText using Kotlin?
• How to pass a String from one Activity to another Activity in Android using Kotlin?
• How to programmatically set drawableLeft on the Android button using Kotlin?
• How to start an Android activity when use clicks on Notification?
• Start an Activity from a Notification in Android?
• How to handle a back button in an android activity?
• How to send a variable from Activity to Fragment in Android using Kotlin?
• How to start Service using Alarmmanager in Kotlin Android?
• How do I restart an Android Activity using Kotlin?
• How to set the ringtone in Android from Android activity using Kotlin?
• How to change Screen Orientation programmatically using a Button in Android Kotlin?
• How to start an activity when user clicks a notification in Android?
• How to start a Service at Boot Time in Android App using Kotlin?
• How to call an activity method from a fragment in Android App using Kotlin.