Meine Farbe in XML nicht in der tatsächlichen Layout reflektierenden

Question

Meine XML wie folgt aussieht,

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 

    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:background="@drawable/blackboard" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin"> 
    <ScrollView 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/scroll_view_qr_lost"> 
     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:layout_marginBottom="50dp" 
      android:orientation="vertical"> 
      <android.support.v7.widget.CardView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:padding="10dp" 
       android:layout_margin="15dp" 
       android:background="#ccc" 
       android:orientation="horizontal"> 
       <EditText 
        android:layout_width="match_parent" 
        android:layout_margin="15dp" 
        android:textColor="#222" 
        android:hint="Type School Name * " 
        android:id="@+id/school_name_activity_lost_qr" 
        android:textColorHint="#6d0d" 
        android:gravity="center" 
        android:layout_height="wrap_content" /> 
      </android.support.v7.widget.CardView> 

      <android.support.v7.widget.CardView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:padding="10dp" 
       android:layout_margin="15dp" 
       android:background="#ccc" 
       android:orientation="horizontal"> 
       <EditText 
        android:layout_width="match_parent" 
        android:layout_margin="15dp" 
        android:textColor="#222" 

        android:hint="Type Student's Name * " 
        android:id="@+id/student_name_activity_lost_qr" 
        android:textColorHint="#6d0d" 
        android:gravity="center" 
        android:layout_height="wrap_content" /> 
      </android.support.v7.widget.CardView> 

      <android.support.v7.widget.CardView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:padding="10dp" 
       android:layout_margin="15dp" 
       android:background="#ccc" 
       android:orientation="horizontal"> 
       <EditText 
        android:layout_width="match_parent" 
        android:layout_margin="15dp" 
        android:textColor="#222" 
        android:hint="Type Student's Class * " 
        android:id="@+id/class_no_activity_lost_qr" 
        android:textColorHint="#6d0d" 
        android:gravity="center" 
        android:layout_height="wrap_content" /> 
      </android.support.v7.widget.CardView> 

      <android.support.v7.widget.CardView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:padding="10dp" 
       android:layout_margin="15dp" 
       android:background="#000" 
       android:orientation="horizontal"> 
       <EditText 
        android:layout_width="match_parent" 
        android:layout_margin="15dp" 
        android:hint="Type Section (If any) " 
        android:textColor="#222" 
        android:id="@+id/student_section_activity_lost_qr" 
        android:textColorHint="#6d0d" 
        android:gravity="center" 
        android:layout_height="wrap_content" /> 
      </android.support.v7.widget.CardView> 
      <android.support.v7.widget.CardView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:padding="10dp" 
       android:layout_margin="15dp" 
       android:background="#ccc" 
       android:orientation="horizontal"> 
       <EditText 
        android:layout_width="match_parent" 
        android:layout_margin="15dp" 
        android:hint="Type Student's Roll No * " 
        android:id="@+id/student_roll_no_activity_lost_qr" 
        android:textColorHint="#6d0d" 
        android:gravity="center" 
        android:textColor="#222" 
        android:inputType="number" 
        android:layout_height="wrap_content" /> 
      </android.support.v7.widget.CardView> 

      <TextView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:text="* fields must be entered, \nPlease press the blue floating button to submit. " 
       android:gravity="center" 
       android:layout_marginBottom="10dp" 
       android:textColor="#ccc"/> 

      <android.support.design.widget.FloatingActionButton 
       android:id="@+id/fab_submit_lost_qr_application" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center" 
       android:clickable="true" 
       android:layout_alignParentBottom="true" 
       app:backgroundTint="@color/colorPrimaryii" 
       android:layout_centerInParent="true" 
       android:layout_margin="@dimen/fab_margin" 
       android:src="@android:drawable/ic_menu_send" /> 


     </LinearLayout> 

    </ScrollView> 

</RelativeLayout> 

Und mein Bildschirm sollte wie folgt aussehen.

Aber meine eigentliche Bildschirm in Gerät sieht wie folgt aus,

so kann jemand vorschlagen, was mit meinem Programm läuft falsch?

P.S. Die Farben funktionierten früher einwandfrei.

Answer 1

Es sieht so aus, als ob CardView ein anderes Attribut verwendet, um die Hintergrundfarbe festzulegen.

Versuchen Sie es mit App: cardBackgroundColor = "# ccc"

Answer 2

Versuchen:

card_view:cardBackgroundColor="#ccc" 

Denken Sie daran, zu erklären:

xmlns:card_view="http://schemas.android.com/apk/res-auto" 

Answer 3

Sie müssen die App-Tools für die Karte Ansicht verwenden, also ändern Sie einfach App: cardbackgroundcolor = "# ccc" anstelle von android: background = "# ccc"