Android Detect Phone Call BroadcastReceiver Kotlin example

1/Step :  Create A New Project  and add the code  AndroidManifest 

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

    <uses-feature
        android:name="android.hardware.telephony"
        android:required="false" />

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.READ_CALL_LOG" />
    <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />


    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.CallDelet"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        
        <receiver android:name=".PhoneCallReceiver"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
            </intent-filter>
        </receiver>
        
        

    </application>

</manifest>

2/Step :  Create A New Class BroadcastReceiver

import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.telephony.TelephonyManager
import android.util.Log

class PhoneCallReceiver : BroadcastReceiver() {
    override fun onReceive(context: Context, intent: Intent) {
        val action = intent.action
        if (action == TelephonyManager.ACTION_PHONE_STATE_CHANGED) {
            val state = intent.getStringExtra(TelephonyManager.EXTRA_STATE)
            when (state) {
                TelephonyManager.EXTRA_STATE_RINGING -> {
                    val incomingNumber = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER)
                    Log.d("PhoneCallReceiver", "Incoming call from: $incomingNumber")
                }
                TelephonyManager.EXTRA_STATE_OFFHOOK -> {
                    Log.d("PhoneCallReceiver", "Call answered")
                }
                TelephonyManager.EXTRA_STATE_IDLE -> {
                    Log.d("PhoneCallReceiver", "Call ended")
                }
            }
        } else if (action == Intent.ACTION_NEW_OUTGOING_CALL) {
            val outgoingNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER)
            Log.d("PhoneCallReceiver", "Outgoing call to: $outgoingNumber")
        }
    }
}

3/Step :  Add the code MainActivity

import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.alomkaisa.calldelet.R

class MainActivity : AppCompatActivity() {

    companion object {
        const val PERMISSION_REQUEST_CODE = 1
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)
            != PackageManager.PERMISSION_GRANTED
        ) {
            ActivityCompat.requestPermissions(
                this,
                arrayOf(Manifest.permission.READ_PHONE_STATE, Manifest.permission.READ_CALL_LOG),
                PERMISSION_REQUEST_CODE
            )
        }
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permissions granted
            } else {
                // Permissions denied
            }
        }
    }
}