Element LinearLayout is not allowed in CardView

问题:

Note: PLEASE READ THE QUESTION before mark it as duplicate! I've mentioned that the similar question has not solved my problem.

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I am using android.support.v7.widget.CardView for my layout xml. However when I place a LinearLayout within the CardView, Android Studio gives me the following error "Element LinearLayout is not allowed here".

In fact ANY types of widgets (like TextView) would cause this error, I have tried solutions from LinearLayout flagged if used in CardView link, which was to restart Android Studio. But it did not work. Below is my xml code:

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

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

    <LinearLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

And I will also post a screenshot!

What could be the problem??

回答1:

So, a collection of suggestions, just to be sure:

• restart AS
• invalidating Caches & restart
• Check if the right dependencies are added
• clean & rebuild of project
• try same code in another file/project
• trying to find a backup of your project
• maybe computer reboot

回答2:

make sure that you did not inter constrains(magic stick) to card view because it will add constrains to card view and prevent any linear layout.