I'm using android studio 3.1.3 and it gives me error whenever I add navigation Drawer Activity and some of the xml files are not working as should be

Question

When I create Navigation Drawer Activity, and some xml files are not working and it gives me error like this when I open .xml files..

The following classes could not be found:

- android.support.design.widget.AppBarLayout (Fix Build Path, Edit XML, Create Class)
- android.support.design.widget.CoordinatorLayout (Fix Build Path, Edit XML, Create Class)
- android.support.design.widget.FloatingActionButton (Fix Build Path, Edit XML, Create Class)
- android.support.v7.widget.RecyclerView (Fix Build Path, Edit XML, Create Class)
- android.support.v7.widget.Toolbar (Fix Build Path, Edit XML, Create Class)

Tip: Try to build the project. Tip: Try to refresh the layout.

v

Have you added related design library dependencies in your build.gradle? — user11298876
– user11298876, Commented Apr 12, 2020 at 4:16

Muhammad · Accepted Answer · 2020-04-12 07:44:43Z

0

change your packages to these packages:

androidx.coordinatorlayout.widget.CoordinatorLayout
com.google.android.material.appbar.AppBarLayout
com.google.android.material.appbar.CollapsingToolbarLayout
androidx.appcompat.widget.Toolbar

also add in your gradle

implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support:design:28.0.0'

Also check this question

answered Apr 12, 2020 at 7:44

Muhammad

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1 Comment

Sayed Ali Yahya Over a year ago

Thanks dear bro!!!!! and now the problems from .java classes resolved but the .xml files are still the same and showing their drawers... please click on ' v ' symbol.

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