What's the difference between the CardView fro

问题:

I'd like to know the difference between both widgets android.support.v7.widget.CardView which is added using Android Studio IDE components palette and com.google.android.material.card.MaterialCardView which is used on Material Design documentation.

Are they two libraries that contains the same widget? Which one should I use and how to take this decision?

I tried to read more the developers.android documentation, but the docs on developer.android are really big with many version and I'm yet a bit confused and couldn't find a good explanation between all of these versions, the history of it all and how it got there. Does someone feel happy to gives me a insight about this history?

Material design documentation usage:

<com.google.android.material.card.MaterialCardView
    android:layout_width="match_parent"
   android:layout_height="wrap_content">
</com.google.android.material.card.MaterialCardView>

Source: https://material.io/develop/android/components/material-card-view/

The CardView XML added when using Android Studio:

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
</android.support.v7.widget.CardView>

回答1:

I made a research in the last days about the history of Android libraries and I've got a conclusion that I'd like to share:

1. The component android.support.v7.widget.CardView is part of an old library and it's recommended to be replaced with com.google.android.material.card.MaterialCardView
2. Android support library (android.support.*) is an old library that was replace by the new Android X Library in 2018 (which is part of Jetpack Library) and also by material components android

References:

https://medium.com/@neerajmoudgil/upgrading-to-new-android-material-design-components-e62ddb03c3d2

https://developer.android.com/reference (It's big, but worth to take a look for beginners who would like to understand the history of Android Libraries and also about all of the Android Versions)

回答2:

According to Material Design docs

MaterialCardView is a customizable component based on CardView from the Android Support Library. MaterialCardView provides all of the features of CardView, but adds attributes for customizing the stroke and uses an updated Material style by default.

回答3:

There are 3 versions:

• android.support.v7.widget.CardView: it is provided by the old support libraries and it is deprecated.

• androidx.cardview.widget.CardView it is the androidx version and it replaced the support libraries.
  To use it you have to add the dependency implementation 'androidx.cardview:cardview:x.x.x'.

• com.google.android.material.card.MaterialCardView is provided by the Material Components Library. To use it you have to add the dependency implementation 'com.google.android.material:material:1.1.0'.

The MaterialCardView extends the androidx.cardview.widget.CardView and introduces some changes as the use of a MaterialShapeDrawable as background (it allows shaping and elevation overlays for Dark Themes).
Also MaterialCardView supports checking and dragging.