How to get the ActionBar height in Android using Kotlin?

This example demonstrates how to get the ActionBar height 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:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity">    <androidx.appcompat.widget.Toolbar       android:id="@+id/actionBarSize"       android:layout_width="match_parent"       android:layout_height="wrap_content"       android:background="@color/colorAccent"       android:theme="@style/ThemeOverlay.AppCompat.Dark">    </androidx.appcompat.widget.Toolbar>    <Button       android:id="@+id/btnGetHeight"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerInParent="true"       android:text="Get Action Bar height" />    <TextView       android:id="@+id/textView"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_below="@id/btnGetHeight"       android:layout_centerInParent="true"       android:layout_marginTop="15dp"       android:textSize="16sp"       android:textStyle="bold" /> </RelativeLayout>

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

import android.os.Bundle import android.widget.Button import android.widget.TextView import androidx.appcompat.app.AppCompatActivity import androidx.appcompat.widget.Toolbar class MainActivity : AppCompatActivity() {    lateinit var toolbar: Toolbar    lateinit var button: Button    lateinit var textView: TextView    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       toolbar = findViewById(R.id.actionBarSize)       toolbar.title = "MyActionBar"       supportActionBar       textView = findViewById(R.id.textView)       button = findViewById(R.id.btnGetHeight)       button.setOnClickListener {          val height = toolbar.height          textView.text = "ActionBar Height: $height pixels"       }    } }

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.