我正在尝试实现类似查看 RecyclerView (id=schedule_recycler_view) 中的项目列表之类的功能,其父布局是 CardView (id = info_card_view)。该项目是通过 API 调用获取的。如果没有找到项目,或者连接问题,我想查看另一个布局(id = no_list_layout),该布局在第一次时是可见性消失的。
但是我面临的问题是,虽然我以编程方式使该布局(id = no_list_layout)的可见性可见,但它并不可见。
有人可以帮忙吗?
这是我尝试过的代码
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/top_bar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="@dimen/_90sdp"
android:orientation="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="@id/guideline">
<com.google.android.material.textview.MaterialTextView/>
<com.google.android.material.textview.MaterialTextView/>
<com.google.android.material.textview.MaterialTextView/>
</LinearLayout>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline"
android:layout_width="0dp"
android:layout_height="0dp"
android:orientation="horizontal"
app:layout_constraintGuide_begin="@dimen/_90sdp" />
<ImageView
android:id="@+id/add_schedule_image_view"
android:layout_width="@dimen/_50sdp"
android:layout_height="@dimen/_50sdp"
android:background="@drawable/circle_white_with_blue_border"
android:padding="@dimen/_5sdp"
android:src="@drawable/ic_plus"
app:layout_constraintBottom_toBottomOf="@id/guideline"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.9"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@id/guideline" />
<com.google.android.material.card.MaterialCardView
android:id="@+id/info_card_view"
style="@style/CardViewStyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="@dimen/_200sdp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/top_bar_layout">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/schedule_recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
<LinearLayout
android:id="@+id/no_list_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="@dimen/_15sdp"
android:orientation="vertical"
android:gravity="center"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="@+id/not_found_image_view"
android:layout_width="@dimen/_150sdp"
android:layout_height="@dimen/_150sdp"
tools:src="@drawable/ic_schedule"/>
<TextView
android:id="@+id/not_found_text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:text="No Invoice"
/>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
</androidx.constraintlayout.widget.ConstraintLayout>
在 kotlin 文件中
class TutorScheduleFragment : BaseFragment() {
private val tuitionScheduleAdapter by lazy {
TutorScheduleAdapter {
context?.showToast(it.day)
}
}
private val viewModel: TutorScheduleViewModel by lazy {
getViewModel {
TutorScheduleViewModel(
PreferenceService(context?.getSharedPreference()!!)
)
}
}
override fun getLayoutResId() = R.layout.fragment_tutor_schedule
override fun onResume() {
viewModel.getSchedule(jobTutorId!!)
}
override fun observeLiveData() {
viewModel.tuitionScheduleUiState.observe(this@TutorScheduleFragment, Observer {
it.getContentIfNotHandled()?.let { state ->
when (state) {
is Progress -> {
if (state.isLoading) {
} else {
}
}
is Success -> {
val schedules = state.successInfo.data
if (scheduleData.schedules.size == 0) {
no_list_layout.visibility = View.VISIBLE
} else {
tuitionScheduleAdapter.notifyChanged(scheduleData.schedules)
}
}
is Alert -> context?.showToast(state.alert)
is Failure -> {
if (state.throwable is IOException) {
context?.showToast("Internet Connection Failed")
} else {
context?.showToast("Json Parsing Error")
}
}
}
}
})
}
}
最佳答案
您应该使用no_list_layout.visibility = View.VISIBLE
关于android - 不可见布局在 Android 中可见时不可见,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61450369/