android relativelayout: the last viewgroup won't get over the header? -


i want last viewgroup id chats overlap previous viewgroups , occupy whole screen of phone. xml code below presume want. codes not. please help.

below xml codes. 

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/root" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.testapp.mainactivity"> <linearlayout     android:id="@+id/bar"     android:layout_alignparentstart="true"     android:orientation="horizontal"     android:gravity="center_vertical"     android:background="#999999"     android:elevation="10dp"     android:layout_width="match_parent"     android:layout_height="40dp">     <imageview         android:id="@+id/bar_img"         android:src="@drawable/ic_autorenew_black_24dp"         android:gravity="clip_vertical"         android:paddingstart="8dp"         android:layout_width="36dp"         android:layout_height="36dp" />     <textview         android:id="@+id/bar_title"         android:text="title"         android:ellipsize="end"         android:layout_weight="1"         android:gravity="center"         android:textcolor="#ffffff"         android:textstyle="bold"         android:textsize="18sp"         android:layout_width="0dp"         android:layout_height="wrap_content" /> </linearlayout> <framelayout     android:id="@+id/root_frag"     android:layout_below="@id/bar"     android:layout_width="match_parent"     android:layout_height="match_parent"></framelayout> <linearlayout     android:id="@+id/chats"     android:background="#ea2312"     android:orientation="vertical"     android:layout_alignparentstart="true"     android:layout_width="match_parent"     android:layout_height="match_parent">     <linearlayout         android:id="@+id/chat_list"         android:orientation="vertical"         android:layout_width`enter code here`="match_parent"         android:layout_height="wrap_content">         <textview             android:text="hello world"             android:layout_width="match_parent"             android:layout_height="wrap_content" />     </linearlayout> </linearlayout> </relativelayout>

this preview screenshot.

enter image description here

the "chats" linearlayout does fill whole screen, "bar" linearlayout appears on top of (even though it's defined earlier inside relativelayout) because of android:elevation attribute.

to make stop, either remove elevation attr "bar" view, or add (larger) elevation attr "chats" view.


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