I have two app A and B. I am trying to bind an activity in app A to the remote service of app B. But i can’t. Please help me!
Here are my code:
Manifest file in app B

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

    <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.KKA"
        tools:targetApi="31">
        <service
            android:name="com.example.kka.MyService"
            android:exported="true"
            android:enabled="true"
           >


        </service>

        <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>

    </application>

</manifest>

Service file in app B

package com.example.kka

import android.app.Service
import android.content.Intent
import android.os.IBinder
import android.util.Log
import android.widget.Toast

private const val MSG_REGISTER = 1;
private const val MSG_STORAGE = 2;
private const val MSG_GET = 3;
class MyService : Service() {

    private val binder =  object : IMyAidlInterface.Stub() {
        override fun findFactorialService(x: Int): Int {
            return x * x
        }

    }

    override fun onBind(intent: Intent): IBinder {
        Toast.makeText(applicationContext, "OnBind", Toast.LENGTH_SHORT).show()
        Log.d("Service", "Bind")
        return binder
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {

        Log.d("Service", "Start")
        return super.onStartCommand(intent, flags, startId)
    }

}

AIDL file

// IMyAidlInterface.aidl
package com.example.kka;

// Declare any non-default types here with import statements

interface IMyAidlInterface {
    /**
     * Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
      int findFactorialService(int x);
}

Activity in app A

package com.example.test

import android.content.ComponentName
import android.content.Context
import android.content.Intent
import android.content.ServiceConnection
import android.os.Bundle
import android.os.IBinder
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.example.test.databinding.ActivityMainBinding


class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    private  var isBound : Boolean = false
    var mService : IMyAidlInterface? = null
   private val mConnection = object : ServiceConnection  {
       override fun onServiceConnected(name: ComponentName?, service: IBinder?) {
           Toast.makeText(applicationContext, "Connected", Toast.LENGTH_SHORT).show()
           isBound = true
           mService = IMyAidlInterface.Stub.asInterface(service)
       }

       override fun onServiceDisconnected(name: ComponentName?) {
           Toast.makeText(applicationContext, "Unconnected", Toast.LENGTH_SHORT).show()
           isBound = false
           mService = null
       }

   }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        // Example of a call to a native method
        binding.sampleText.text = stringFromJNI()
        binding.button.setOnClickListener {
            handleClick()
        }
    }

    private fun handleClick() {
        Toast.makeText(this, isBound.toString(), Toast.LENGTH_SHORT).show()
    }
    override fun onStart() {
        super.onStart()

        val intent = Intent()
        intent.setPackage("com.example.kka")
        intent.setComponent( ComponentName("com.example.kka", "com.example.kka.MyService"))
        bindService(intent, mConnection, Context.BIND_AUTO_CREATE )

    }
    
}

when i started app A, onStart() runned but it didn’t bind to the service and onServiceConnected() wasn’t called