[안드로이드 스튜디오/코틀린] 프래그먼트, 인클루드 Fragment frag1.xml frag2.xml activity_main.xml MainActivity.kt package com.shinyelee.android_study2 import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.fragment.app.Fragment import com.shinyelee.android_study2.databinding.ActivityMainBinding ..