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각 뷰에는 nestedScrollView를 사용하는 3 개의 프래그먼트가 있습니다. 하나를 전환 할 때마다 nestedScrollView가 appBar 아래로 스크롤됩니다. 필자는 InfoFragment의 수명주기 동안 특정 뷰를 설정하는 것이 문제가 될 수 있다고 생각합니다. 나는 그것을 아래에 게시 할 것이다. 
viewPager 내에서 nestedScrollView를 사용하면 이상한 동작이 발생합니다.
정보] 조각의 XML :
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/scroll_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="72dp"
android:clipToPadding="false"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:ignore="RtlSymmetry"
tools:targetApi="N">
<TextView
android:id="@+id/tagline"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:padding="16dp"
android:gravity="center"
android:textSize="18sp"
android:textStyle="italic|bold"
android:fontFamily="sans-serif-condensed"
tools:text="Good vs Evil" />
<TextView
android:id="@+id/overview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="14dp"
android:gravity="center"
android:textSize="18sp"
tools:text="@string/dummy_summary"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:textSize="20sp"
android:textStyle="bold"
android:text="@string/cast"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/cast_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:orientation="vertical"
android:clipToPadding="false"
android:nestedScrollingEnabled="false"
app:layoutManager="LinearLayoutManager"
tools:listitem="@layout/card_actor"
tools:layout_height="200dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:textSize="20sp"
android:textStyle="bold"
android:text="@string/where_to_watch"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/source_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:orientation="vertical"
android:clipToPadding="false"
android:nestedScrollingEnabled="false"
app:layoutManager="LinearLayoutManager"
tools:listitem="@layout/card_source" />
</LinearLayout>
viewPager를 포함하는 조각에서 XML :
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:targetApi="lollipop">
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:ignore="RtlSymmetry"/>
<android.support.v4.widget.ContentLoadingProgressBar
android:id="@+id/loading"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
style="?android:progressBarStyle"
tools:targetApi="lollipop" />
<RelativeLayout
android:id="@+id/error"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center">
<TextView
android:id="@+id/error_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:padding="32dp"
/>
<Button
android:id="@+id/error_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/error_message"
android:layout_centerHorizontal="true"
android:text="@string/recycle"/>
</RelativeLayout>
InfoFragment. UpdateView()는 모든 onStart()에서 발표자의 하위보기에 자신을 추가 할 때마다 호출됩니다.
class MovieInfoFragment() : BaseFragment(), MovieContract.Subview {
// Parameters
override val layoutId: Int = R.layout.fragment_movie_info
// Objects
@Inject lateinit var presenter: MovieContract.Presenter
@Inject lateinit var creditsAdapter: CreditsAdapter
@Inject lateinit var sourceAdapter: SourceAdapter
// Views
val overview: TextView get() = find(R.id.overview)
val tagline: TextView get() = find(R.id.tagline)
val castList: RecyclerView get() = find(R.id.cast_list)
val sourceList: RecyclerView get() = find(R.id.source_list)
fun updateView() {
if (view == null || activity == null) return
presenter.getMovie()?.let {
overview.text = " ${it.overview}"
tagline.text = it.tagline
tagline.visibleIf(!it.tagline.isNullOrBlank())
creditsAdapter.credits = it.credits
sourceAdapter.setNewItems(it.sources)
}
}
override fun updateMovie(movie: Movie) {
updateView()
}
override fun updateColor(color: Int) {
}
override fun scrollToTop() {
}
override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
castList.adapter = creditsAdapter
sourceList.adapter = sourceAdapter
sourceAdapter.listener = { presenter.onSourceClicked(it) }
}
override fun onStart() {
super.onStart()
presenter.addSubview(this)
}
override fun onStop() {
presenter.removeSubview(this)
super.onStop()
}
}