如何在 ConstraintLayout 中将 ImageView 放在 CardView 之上

Question

I want to create a layout like this, but I don't know how to place the CardView background under the ImageView and then set TextView below the image. The image should have 300dp height and 200dp width.

Answer 1

Constrain the bottom and top of your first card with the top of the second CardView, this allows you to align the center of the first card view with the top of the second CardView. and so that the First CradView is above just add an elevation higher than that of the card below

for example:

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity2">

    <androidx.cardview.widget.CardView
        app:cardCornerRadius="15dp"
        android:id="@+id/bottomCard"
        android:layout_width="match_parent"
        android:layout_height="250dp"
        android:layout_margin="20dp"
        app:cardElevation="9dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias=".7">

    </androidx.cardview.widget.CardView>


    <androidx.cardview.widget.CardView
        app:cardElevation="10dp"

        app:cardBackgroundColor="@color/purple_700"
        app:cardCornerRadius="15dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toTopOf="@id/bottomCard"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@id/bottomCard">

        <ImageView
            android:id="@+id/image"
            android:layout_width="250dp"
            android:layout_height="300dp"
            android:background="@drawable/ic_android_black_24dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </androidx.cardview.widget.CardView>


</androidx.constraintlayout.widget.ConstraintLayout>

this is the output

Answer 2

you must use app:cardElevation attr for card view and use android:elevation attr for other views for do that