https://developer.android.com/guide/navigation/navigation-swipe-view-2
해당 개발문서 링크에 있는 샘플코드를 사용하려고 하는데 xml파일과 kt파일은 복사 붙여넣기 했고 id도 일부러 똑같이 했습니다. 그런데 코드를 실행해보면 아무것도 나오질 않네요. (종속성도 전부 추가했어요) MainActivity.kt파일에
onCreate()메서드 안에 CollectionDemoFragment()만 하면 그려지는게 아닌가요??ㅜㅜ
+추가했습니다!!
[MainActivity.kt]
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.collection_demo)
CollectionDemoFragment()
}
}
class CollectionDemoFragment : Fragment() {
// When requested, this adapter returns a DemoObjectFragment,
// representing an object in the collection.
private lateinit var demoCollectionAdapter: DemoCollectionAdapter
private lateinit var viewPager: ViewPager2
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
return inflater.inflate(R.layout.collection_demo, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
demoCollectionAdapter = DemoCollectionAdapter(this)
viewPager = view.findViewById(R.id.pager)
viewPager.adapter = demoCollectionAdapter
val tabLayout = view.findViewById<TabLayout>(R.id.tab_layout)
TabLayoutMediator(tabLayout, viewPager) { tab, position ->
tab.text = "OBJECT ${(position + 1)}"
}.attach()
}
}
class DemoCollectionAdapter(fragment: Fragment) : FragmentStateAdapter(fragment) {
override fun getItemCount(): Int = 100
override fun createFragment(position: Int): Fragment {
// Return a NEW fragment instance in createFragment(int)
val fragment = DemoObjectFragment()
fragment.arguments = Bundle().apply {
// Our object is just an integer :-P
putInt(ARG_OBJECT, position + 1)
}
return fragment
}
}
private const val ARG_OBJECT = "object"
// Instances of this class are fragments representing a single
// object in our collection.
class DemoObjectFragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View {
return inflater.inflate(R.layout.fragment_collection_object, container, false)
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
arguments?.takeIf { it.containsKey(ARG_OBJECT) }?.apply {
val textView: TextView = view.findViewById(android.R.id.text1)
textView.text = getInt(ARG_OBJECT).toString()
}
}
}
[collection_demo.xml]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
[fragment_collection_object.xml]
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
