不可见布局在 Android 中可见时不可见

Question

I am trying to implement something like viewing a list of items in RecyclerView (id=schedule_recycler_view) which parent layout is a CardView (id = info_card_view). The Item is fetched by API call. If no item found, or connectivity issue, I want to view another layout (id = no_list_layout) which is Visibility-Gone at the first time.

But The problem I face, although I make the visibility of that layout (id = no_list_layout) visible programmatically, it did not visible.

Can anyone help?

Here the code what I tried

<?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>

in kotlin file

    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")
                        }
                    }
                }
            }
        })


    }

}

Answer 1

You should use no_list_layout.visibility = View.VISIBLE

Answer 2

Change your view visibility code

try this:

Kotlin:

if (list.size == 0) {
    no_list_layout.visibility= View.VISIBLE
} else {
    adapter.notifyChanged(list)
}

In Java

if (list.size == 0) {
        no_list_layout.setVisibility(View.VISIBLE)
    } else {
        adapter.notifyChanged(list)
    }

Answer 3

You can try with runOnUiThread .

runOnUiThread runs the specified action on the UI thread. If the current thread is the UI thread, then the action is executed immediately. If the current thread is not the UI thread, the action is posted to the event queue of the UI thread.

context?.runOnUiThread(Runnable {
    // Your Logic
  if (list.size==0) {
       no_list_layout.visibility= View.VISIBLE
  } else {
       // Your work
  }
})

Answer 4

You have to hide your recyclerview also and make it visible in the other case like this:

if (scheduleData.schedules.size == 0) {
    schedule_recycler_view.visibility = View.GONE
    no_list_layout.visibility = View.VISIBLE
} else {   
    schedule_recycler_view.visibility = View.VISIBLE
    no_list_layout.visibility = View.GONE                              
    tuitionScheduleAdapter.notifyChanged(scheduleData.schedules)
}

Answer 5

At last, I found the actual culprit. It was in the layout file. I recreate the layout

<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/info_card_view"
    style="@style/CardViewStyle"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/top_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/rectangle_light_blue_top_info_holder"
        android:minHeight="@dimen/_90sdp"
        android:orientation="vertical"
        android:paddingTop="@dimen/_10sdp"
        android:paddingBottom="@dimen/_10sdp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <com.google.android.material.textview.MaterialTextView
            android:id="@+id/upcoming_action_text_view"
            style="@style/TextViewStyle.Bold"
            android:text="Upcoming Test"
            android:textSize="@dimen/_8ssp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <com.google.android.material.textview.MaterialTextView
            android:id="@+id/date_text_view"
            style="@style/TextViewStyle.Bold"
            android:text="16 Aug, Wednesday"
            android:textSize="@dimen/_15ssp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/upcoming_action_text_view" />

        <ImageView
            android:id="@+id/add_action_image_view"
            android:layout_width="@dimen/_30sdp"
            android:layout_height="@dimen/_30sdp"
            android:src="@drawable/ic_plus"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.956"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/upcoming_action_view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="@dimen/_20sdp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/date_text_view" />

        <com.tbuonomo.viewpagerdotsindicator.WormDotsIndicator
            android:id="@+id/dots_indicator"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:dotsColor="@color/colorAccent"
            app:dotsSize="@dimen/_8sdp"
            app:dotsSpacing="@dimen/_2sdp"
            app:dotsStrokeColor="@color/light_blue"
            app:dotsStrokeWidth="@dimen/_1sdp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.5"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/upcoming_action_view_pager" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/previous_action_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginTop="@dimen/_10sdp"
        android:orientation="vertical"
        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/top_bar_layout"
        tools:itemCount="5"
        tools:listitem="@layout/item_previous_action_of_confirm_job" />

    <LinearLayout
        android:id="@+id/no_list_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/top_bar_layout">

        <ImageView
            android:id="@+id/not_found_image_view"
            android:layout_width="@dimen/_150sdp"
            android:layout_height="@dimen/_150sdp"
            android:src="@drawable/ic_schedule" />

        <TextView
            android:id="@+id/not_found_text_view"
            style="@style/TextViewStyle.Center.Bold"
            android:layout_marginTop="@dimen/_10sdp"
            android:textColor="@color/colorTextSecondary"
            android:text="No Invoice" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>