Create a layout like this
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="@color/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay"/>
<LinearLayout
android:id="@+id/info_message_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="@dimen/padding_medium"
android:visibility="gone"
tools:visibility="visible">
<ImageView
android:id="@+id/home.info_message_icon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="@dimen/margin_medium" />
<TextView
android:id="@+id/message_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
/>
</LinearLayout>
</android.support.design.widget.AppBarLayout>
And set the visibility to VISIBLE when your want to show it
create drawable inside xml file my_shadow.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item >
<shape
android:shape="rectangle">
<solid android:color="@android:color/darker_gray" />
<padding android:bottom="2dp"/>
<corners android:radius="5dp"/>
</shape>
</item>
<item android:right="1dp" android:left="1dp" android:bottom="2dp">
<shape
android:shape="rectangle">
<solid android:color="@android:color/white"/>
<corners android:radius="5dp"/>
</shape>
</item>
</layer-list>
Add background of ur layout
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:background="@drawable/my_shadow"
android:orientation="horizontal"
android:weightSum="2">
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