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

Question

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

AndroidMobile DevelopmentApps/ApplicationsKotlin

---

---

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

Published on 29-Sep-2020 16:07:13

Previous Page Print Page

Next Page  

Advertisements