How to get screen dimensions in pixels on Android App using Kotlin?

This example demonstrates how to get screen dimensions in pixels on the Android App 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:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <TextView       android:id="@+id/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/tvHeight"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerInParent="true"       android:textColor="@android:color/background_dark"       android:textSize="24sp"       android:textStyle="bold" />    <TextView       android:id="@+id/tvWidth"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_below="@+id/tvHeight"       android:layout_centerInParent="true"       android:layout_marginTop="10dp"       android:textColor="@android:color/background_dark"       android:textSize="24sp"       android:textStyle="bold" /> </RelativeLayout>

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

import android.os.Bundle import android.util.DisplayMetrics import android.view.WindowManager import android.widget.TextView import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    lateinit var tvHeight: TextView    lateinit var tvWidth: TextView    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       tvHeight = findViewById(R.id.tvHeight)       tvWidth = findViewById(R.id.tvWidth)       val displayMetrics = DisplayMetrics()       val windowsManager = applicationContext.getSystemService(WINDOW_SERVICE) as WindowManager       windowsManager.defaultDisplay.getMetrics(displayMetrics)       val deviceWidth = displayMetrics.widthPixels       val deviceHeight = displayMetrics.heightPixels       tvWidth.text = "Width in Pixels: $deviceWidth"       tvHeight.text = "Height in Pixels: $deviceHeight"    } }

Step 4 − 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.