Why on the application cannot show?-CodePudding

Has set up a match opens at the parent but still nothing

CodePudding user response:

If code is coming, the layout in your activity or fragments loaded correctly?

CodePudding user response:

reference m - 1/f, oj response:

code is coming, whether the layout in your activity or fragments loaded correctly?

Is this main_activity

CodePudding user response:

The XML file

 & lt; ? The XML version="1.0" encoding="utf-8"?> 
XMLNS: app="http://schemas.android.com/apk/res-auto" 
XMLNS: tools="http://schemas.android.com/tools" 
The android: id="@ + id/container" 
Android: layout_width="match_parent" 
Android: layout_height="match_parent" & gt; 

The android: id="@ + id/nav_view" 
Android: layout_width="0 dp" 
Android: layout_height="wrap_content" 
Android: layout_marginStart="0 dp" 
Android: layout_marginEnd="0 dp" 
Android: background="? Android: attr/windowBackground 
"App: layout_constraintBottom_toBottomOf="parent" 
App: layout_constraintLeft_toLeftOf="parent" 
App: layout_constraintRight_toRightOf="parent" 
App: menu="@ menu/bottom_nav_menu"/& gt; 

The android: id="@ + id/nav_host_fragment" 
The android: name="androidx. Navigation. Fragments. NavHostFragment" 
Android: layout_width="match_parent" 
Android: layout_height="match_parent" 
App: defaultNavHost="true" 
App: layout_constraintBottom_toTopOf="@ id/nav_view" 
App: layout_constraintEnd_toEndOf="parent" 
App: layout_constraintLeft_toLeftOf="parent" 
App: layout_constraintTop_toTopOf="parent" 
App: layout_constraintVertical_bias="0.0" 
App: navGraph="@ navigation/mobile_navigation"/& gt;

CodePudding user response:

Take a closer look at the layout control properties