Java 为什么BoundService为空？

我对安卓非常陌生，尝试创建简单的服务。我检查了一个试图

但我不能开始服务。服务始终为空。程序未调用

boundServiceConnection

函数

这是我的代码服务代码

class BoundService : Service() {
  private val localBinder: IBinder = MyBinder()
  override fun onBind(intent: Intent): IBinder? {
      return localBinder
  }

  fun randomGenerator(): Int {
      val randomNumber = Random()
      return randomNumber.nextInt()
  }

  inner class MyBinder : Binder() {
      fun getService(): BoundService = this@BoundService
  }
}

这是我的主要活动

var boundService: BoundService? = null
var isBound = false
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}

override fun onStart() {
    super.onStart()
    Intent(this, BoundService::class.java).also { intent ->
        bindService(intent, boundServiceConnection, Context.BIND_AUTO_CREATE)
    }
}

fun onButtonClick(v: View) {
    if (isBound) {
        val num: Int = boundService!!.randomGenerator()
        Toast.makeText(this, "number: $num", Toast.LENGTH_LONG).show()
    }
}

override fun onStop() {
    super.onStop()
    if (isBound) {
        unbindService(boundServiceConnection)
        isBound = false
    }
}

private val boundServiceConnection: ServiceConnection = object : ServiceConnection {
    override fun onServiceConnected(name: ComponentName, service: IBinder) {
        val binderBridge = service as MyBinder
        boundService = binderBridge.getService()
        isBound = true
    }

    override fun onServiceDisconnected(name: ComponentName) {
        isBound = false
        boundService = null
    }
}

---

关于应用程序的服务组件，应该在应用程序清单中注册

---

似乎没有提供有关所需（假设缺失）清单条目的任何信息，因为它在中有介绍。

您说得对！我错过了那部分。多谢各位