Vertically center TextView inside layout in android and also keep layout scrollable-CodePudding

I want to vertically center the TextView in below layout with id text_no_items and also keep the layout scrollable in case the TextView with id description is very long and we need to scroll to see full content.

<?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="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@ id/description"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="This is a sample description about the items you will see below. This text could be very long."
        android:textSize="32sp" />

    <TextView
        android:id="@ id/text_no_items"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="No items"
        android:textSize="48sp" />

</LinearLayout>

The TextView is vertically centered if we set the height of parent layout (LinearLayout) to be match_parent and give layout weights as below. But in this case the layout is not scrollable.

<?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" >

    <TextView
        android:id="@ id/description"
        android:layout_weight="0"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="This is a sample description about the items you will see below. This text could be very long."
        android:textSize="32sp" />

    <TextView
        android:id="@ id/text_no_items"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:gravity="center"
        android:text="No items"
        android:textSize="48sp" />

</LinearLayout>

Suggestions for using other layouts are welcome.

update: adding reference image. sorry for bad image quality

CodePudding user response：

Use ConstraintLayout and put the description TextView inside NestedScrollView like the example below.

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:id="@ id/description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:gravity="center"
            android:text="@string/sample_text"
            android:textSize="32sp" />

    </androidx.core.widget.NestedScrollView>

    <TextView
        android:id="@ id/text_no_items"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="No items"
        android:textSize="48sp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Update

Use ScrollView as root layout

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@ id/scroll_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@ id/description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/sample_text"
            android:textSize="32sp"
            app:layout_constraintBottom_toTopOf="@id/text_no_items"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@ id/text_no_items"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="16dp"
            android:text="No items"
            android:textSize="48sp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/description" />

    </androidx.constraintlayout.widget.ConstraintLayout>


</ScrollView>

This is the