Obtain Phone Number of Android Phone Programmatically Using Kotlin

This example demonstrates how to obtain the phone number of the Android phone programmatically 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.

Example

<?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:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerHorizontal="true"       android:layout_marginTop="50dp"       android:padding="8dp"       android:text="Tutorials Point"       android:textColor="@android:color/holo_green_dark"       android:textSize="48sp"       android:textStyle="bold" />    <TextView       android:id="@+id/textView"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerInParent="true"       android:padding="8dp"       android:textColor="@android:color/holo_blue_dark"       android:textSize="24sp"       android:textStyle="bold" /> </RelativeLayout>

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

Example

import android.Manifest import android.content.Context import android.content.pm.PackageManager import android.os.Bundle import android.telephony.TelephonyManager import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import androidx.core.app.ActivityCompat class MainActivity : AppCompatActivity() {    private lateinit var textView: TextView    private val permission = 101    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       textView = findViewById(R.id.textView)       val telephonyManager = getSystemService(Context.TELEPHONY_SERVICE) as       TelephonyManager       if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_SMS) !=       PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,       Manifest.permission.READ_PHONE_NUMBERS) != PackageManager.PERMISSION_GRANTED &&       ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) !=       PackageManager.PERMISSION_GRANTED) {          ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.READ_PHONE_STATE), permission)       }    textView.text = telephonyManager.line1Number    }    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String?>,    grantResults: IntArray) {       when (requestCode) {          permission -> {             if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {                Toast.makeText(this, "Permission Granted", Toast.LENGTH_SHORT).show()             } else {                Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show()             }          }       }    } }

Step 4 − Add the following code to androidManifest.xml

Example

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.myapplication">    <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