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Add shadow behind the image view in android here is a example image with default shadow in android:
enter image description here

and xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.home.fmat.MainActivity">

<ImageButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/on"
    android:src="@drawable/Google_Duo"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"/>

</RelativeLayout>
paulcab
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1 Answers1

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that background is default ImageButton background. change ImageButton with ImageView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.home.fmat.MainActivity">

<ImageButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/on"
    android:background="@drawable/bg_button"
    android:src="@drawable/Google_Duo"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"/>

</RelativeLayout>

or if you don't want click effect disappear, set ImageButton background with custom background, for example by using statelistdrawable, for example in your drawables, you can define bg_button.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@android:color/red" android:state_pressed="true"/>
    <item android:drawable="@android:color/red" android:state_hovered="true"/>
    <item android:drawable="@android:color/transparent"/>    
</selector>
hakim
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