How to check whether a headset is plugged into an Android device using Kotlin?

This example demonstrates how to check whether a headset is plugged into an Android device 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/text"       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:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerInParent="true"       android:text="Headphones connection status"       android:textColor="@android:color/holo_purple"       android:textSize="16sp"       android:textStyle="bold" /> </RelativeLayout>

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

import android.content.BroadcastReceiver import android.content.Context import android.content.Intent import android.content.IntentFilter import android.os.Bundle import android.widget.Toast import androidx.appcompat.app.AppCompatActivity class MainActivity : AppCompatActivity() {    var broadcastReceiver: BroadcastReceiver? = null    var microphonePluggedIn = false    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       broadcastReceiver = object : BroadcastReceiver() {          override fun onReceive(context: Context?, intent: Intent) {             val action = intent.action             val int: Int             if (Intent.ACTION_HEADSET_PLUG == action) {                int = intent.getIntExtra("state", -1)                if (int == 0) {                   microphonePluggedIn = false                   Toast.makeText(applicationContext, "Headphones not plugged in", Toast.LENGTH_LONG).show()                }                if (int == 1) {                   microphonePluggedIn = true                   Toast.makeText(applicationContext, "Headphones plugged in", Toast.LENGTH_LONG).show()                }             }          }       }       val receiverFilter = IntentFilter(Intent.ACTION_HEADSET_PLUG)       registerReceiver(broadcastReceiver, receiverFilter)    } }

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>             <vaction 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