android - Why does "wrap_content" doesn't work for any ...Layout in XML file using support.design.widgets? -


i here first time , have question. have xml file in android project.

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout  xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/drawer_layout_schedule" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/mainbackground" android:fitssystemwindows="true">    <android.support.design.widget.coordinatorlayout     android:layout_width="match_parent"     android:layout_height="match_parent">         <android.support.design.widget.appbarlayout         android:layout_width="match_parent"         android:layout_height="wrap_content">            <android.support.v7.widget.toolbar             android:id="@+id/toolbar_schedule"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             android:background="?attr/colorprimary" />       </android.support.design.widget.appbarlayout>     </android.support.design.widget.coordinatorlayout>    <android.support.design.widget.navigationview     android:id="@+id/navigation_schedule"     android:layout_width="wrap_content"     android:layout_height="match_parent"     android:layout_gravity="start"     app:headerlayout="@layout/navigation_header"     app:menu="@menu/menu_navigation" />  </android.support.v4.widget.drawerlayout>

but when want add layouts, example linearlayout, in coordinatorlayour after appbarlayout(with atribute layout_height = "wrap_content"), see, places @ begining of drawerlayout. cannt understand why so. what's wrong xml? or need add iany layouts programmly?

maybe problem here in height of appbarlayout.

try set it's height value in dp, i.e. android:layout_height="?attr/actionbarsize" or android:layout_height="50dp"


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