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How to change spinner text size and text color in Android App using Kotlin?
This example demonstrates how to change spinner text size and text color in 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.
<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" android:gravity="center" tools:context=".MainActivity"> <Spinner android:id="@+id/spinner" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.os.Bundle import android.widget.ArrayAdapter import android.widget.Spinner import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() { lateinit var spinner: Spinner override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" spinner = findViewById(R.id.spinner) val superHero = arrayOf<String?>("Batman", "SuperMan", "Flash", "AquaMan", "Shazam") val arrayAdapter: ArrayAdapter<Any?> = ArrayAdapter<Any?>(this, R.layout.spinner_list, superHero) arrayAdapter.setDropDownViewResource(R.layout.spinner_list) spinner.adapter = arrayAdapter } }
Step 4 − Create a layout resource file and add the following code in spinner_list.xml
Example
<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:textColor="@android:color/holo_red_light" android:textSize="16sp" android:textStyle="bold|italic" />
Step 5 − Add the following code to androidManifest.xml
Example
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.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.
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