How to add cardview in layout xml in AndroidX

问题

After upgraded to AndroidX

<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp">

gives a error

The following classes could not be found: - android.support.v7.widget.CardView (Fix Build Path, Edit XML, Create Class)

dependencies {

    implementation 'androidx.appcompat:appcompat:1.0.0'

    implementation 'androidx.cardview:cardview:1.0.0'

but I don't know how to use CardView in xml under AndroidX

Thank you

回答1:

The class has changed to:

androidx.cardview.widget.CardView

If you want to use the old class names, you need to add android:enableJetifier=true to your gradle.properties and use the appcompat dependencies instead.

回答2:

I think the Best Approach should be like, understanding the problem statement first.

Scenario:

Search for the library which Google Inc has changed for "AndroidX" and include in project

Solution :

Go to Artifact Mappings page of Android Developer Site and Search for your desired library.

Now go to AndroidX Releases page and check for the current version number

now go to build.gradle[module.app] add the library you want. (ie. CardView in my case) and press
Sync Now and necessary files will be added to your project by gradle.

See the image below:

Now in xml file you should get CardView or something you have just imported.

NB: pictures included here are (the first two) taken from Android Developer's Page which belongs to Google Inc and could be different depending on the time you see. See this post's posting time.

回答3:

For AndroidX, Add in gradle dependencies

implementation 'androidx.cardview:cardview:1.0.0'

Then in xml-layout use

<androidx.cardview.widget.CardView

回答4:

Add 'androidx.cardview:cardview:1.0.0' in gradle dependencies and modify xml accordingly.

回答5:

You have 2 different options:

Material Components MaterialCardView

Just add:

implementation 'com.google.android.material:material:1.1.0-beta01'

and in your xml you can use:

 <com.google.android.material.card.MaterialCardView
  ...>

Androidx CardView

Just add:

implementation 'androidx.cardview:cardview:1.0.0'

and in your xml you can use:

<androidx.cardview.widget.CardView>

They are different:

MaterialCardView extends androidx.cardview.widget.CardView and provides all of the features of CardView, but adds attributes for customizing the stroke and uses an updated Material style by default (it uses by deafult the style Widget.MaterialComponents.CardView)

More info here.

回答6:

Replace this line

from

<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"

<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"

This will work fine in AndroidX.

回答7:

implementation com.google.android.material:material:1.0.0

implementation com.google.android.material:material:1.0.0-alpha1

it is download all design related class. its work for Me

回答8:

I had the same problem in Android Studio 3.5.1. It worked for me:

def cardview_version = "1.0.0"
implementation "androidx.cardview:cardview:$cardview_version"


xmln: <androidx.cardview.widget.CardView>....

来源：https://stackoverflow.com/questions/53089633/how-to-add-cardview-in-layout-xml-in-androidx

标签

android

android-appcompat

android-cardview

androidx

material-components-android