Develop Reference

I want to add a shadow of a image button in round shape but cant make it

<ImageButton
android:id="#+id/btn_scan_qr"
android:layout_width="216dp"
android:layout_height="203dp"
android:elevation="10dp"
android:background="#drawable/roundbutton"
android:src="#drawable/ic_power_settings_new_black_24dp"
android:textSize="15dp"
tools:layout_editor_absoluteX="97dp"
tools:layout_editor_absoluteY="225dp"
/>
This is Xml code
<item android:state_pressed="false"
>
<shape android:shape="oval">
<corners android:radius="40dp" />
<solid android:color="#FFFFFF"
/>
<padding
android:bottom="40dp"
android:left="40dp"
android:right="40dp"
android:top="40dp" />
</shape>
</item>
This is Drawable code for shape of oval i want to add shadow of it i have used elevation but it doesnot do anything at all in constrained layout but it does in Linear layout but it is showing shadow in square but i want it in circle

Please try below code
oval shape view with shadow
custom_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list>
<item>
<shape
android:shape="oval"
xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#057F86A6"/>
<padding
android:top="2dp"
android:bottom="2dp"
android:right="2dp"
android:left="2dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#107F86A6"/>
<padding
android:top="1.8dp"
android:bottom="1.8dp"
android:right="1.8dp"
android:left="1.8dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#207F86A6"/>
<padding
android:top="1.5dp"
android:bottom="1.5dp"
android:right="1.5dp"
android:left="1.5dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#357F86A6"/>
<padding
android:top="1.1dp"
android:bottom="1.1dp"
android:right="1.1dp"
android:left="1.1dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#457F86A6"/>
<padding
android:top="0.9dp"
android:bottom="0.9dp"
android:right="0.9dp"
android:left="0.9dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#507F86A6"/>
<padding
android:top="0.8dp"
android:bottom="0.8dp"
android:right="0.8dp"
android:left="0.8dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#607F86A6"/>
<padding
android:top="0.5dp"
android:bottom="0.5dp"
android:right="0.5dp"
android:left="0.5dp"/>
</shape>
</item>
<item>
<shape
android:shape="oval" xmlns:android="http://schemas.android.com/apk/res/android">
<solid
android:color="#fff"/>
</shape>
</item>
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
android:orientation="vertical"
android:gravity="center">
<LinearLayout
android:layout_width="120dp"
android:layout_height="120dp"
android:gravity="center"
android:background="#drawable/custom_button">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"/>
</LinearLayout>
</LinearLayout>

Android Drawable Horizontal Line

Is it possible to make line to be like this with xml? or there's some way to do that..?
I already made some drawable with shape but it's not really like i want
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:bottomLeftRadius="30dp"
android:bottomRightRadius="30dp"
android:topLeftRadius="0dp"
android:topRightRadius="0dp" />
<padding
android:bottom="0dp"
android:left="0dp"
android:right="0dp"
android:top="0dp" />
<stroke
android:width="0.8dp"
android:color="#color/colorPrimaryDark" />
<solid android:color="#android:color/transparent" />
</shape>

We can create a drawable file also for this. May be helpful for someone.
Drawable file:
<?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/white" />
</shape>
</item>
<item>
<shape android:shape="rectangle">
<stroke
android:width="5dp"
android:color="#android:color/holo_blue_dark" />
<solid android:color="#android:color/white" />
<corners android:radius="20dp" />
</shape>
</item>
<item android:bottom="25dp">
<shape android:shape="rectangle">
<stroke
android:width="2dp"
android:color="#android:color/white" />
<solid android:color="#android:color/white" />
</shape>
</item>
</layer-list>
Result :

<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="-5dp"
android:insetRight="-5dp"
android:insetTop="-10dp">
<shape android:shape="rectangle">
<solid android:color="#android:color/transparent" />
<stroke
android:width="3dp"
android:color="#color/colorPrimaryDark" />
<corners
android:bottomLeftRadius="25dp"
android:bottomRightRadius="25dp" />
</shape>
</inset>

Try this
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<stroke
android:width="1dp"
android:color="#de0b0b" />
<solid android:color="#ffffff" />
<corners android:radius="20dp" />
</shape>
</item>
<item
android:bottom="5dp"
android:top="0dp">
<shape android:shape="rectangle">
<stroke
android:width="10dp"
android:color="#ffffff" />
<solid android:color="#android:color/transparent" />
<corners android:radius="20dp" />
</shape>
</item>
</layer-list>
USE like this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:gravity="center"
android:background="#ffffff"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/test"
android:text="Nilesh"
android:gravity="center"
android:layout_margin="#dimen/_5sdp"
android:padding="#dimen/_5sdp">
</TextView>
</LinearLayout>
OUTPUT
EDIT
Try this
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape
android:shape="rectangle">
<stroke android:width="1dp" android:color="#a032e4" />
<solid android:color="#a032e4" />
<corners android:radius="40dp"/>
</shape>
</item>
<item android:bottom="4dp" >
<shape
android:shape="rectangle">
<stroke android:width="2dp" android:color="#ffffff" />
<solid android:color="#ffffff" />
<corners android:radius="40dp"/>
</shape>
</item>
</layer-list>
USE LIKE THIS
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:gravity="center"
android:background="#FFFFFF"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/test"
android:layout_margin="20dp"
android:padding="10dp"
android:text="Nilesh Rathod"
android:gravity="center" />
</LinearLayout>
OUTPUT

How to draw vertical shape in the centre of XML drawable

How can a vertical line be drawn within an XML drawable when using a layer-list? I declared 3 shapes within the drawable but for some reason it doesn't appear as expected.
<?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="#color/green"/>
</shape>
</item>
<item android:top="0dp" android:left="1dp" android:bottom="0dp" android:right="5dp">
<shape android:shape="rectangle">
<size android:width="3dp"/>
<solid android:color="#android:color/white"/>
</shape>
</item>
<item android:top="0dp" android:left="5dp" android:bottom="0dp" android:right="1dp">
<shape android:shape="rectangle">
<size android:width="3dp"/>
<solid android:color="#android:color/white"/>
</shape>
</item>
</layer-list>
Current result
Expected result

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:width="16dp"
android:left="15px">
<shape
android:shape="rectangle">
<solid android:color="#color/colorAccent" />/>
<size android:width="5dip" />
<stroke android:color="#color/colorAccent" />
</shape>
</item>
<item
android:width="16dp"
android:left="80px">
<shape
android:shape="rectangle">
<solid android:color="#color/colorAccent" />/>
<size android:width="5dip" />
<stroke android:color="#color/colorAccent" />
</shape>
</item>
<item
android:width="16dp"
android:left="140px">
<shape
android:shape="rectangle">
<solid android:color="#color/colorAccent" />/>
<size android:width="5dip" />
<stroke android:color="#color/colorAccent" />
</shape>
</item>
</layer-list>

Try this solution
drawable/shape.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#color/colorAccent" />/>
<size android:width="5dip" />
<stroke
android:color="#color/colorAccent"
/>
</shape>
Include in the layout file the following
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<View
android:layout_width="15dip"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_horizontal_margin"
android:background="#drawable/shape"></View>
<View
android:layout_width="15dip"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_horizontal_margin"
android:background="#drawable/shape"></View>
<View
android:layout_width="15dip"
android:layout_height="wrap_content"
android:layout_margin="#dimen/activity_horizontal_margin"
android:background="#drawable/shape"></View>
</LinearLayout>
Change the colors and fix the margins of the layout.

How to implement opposite gradient in android?

I am using this
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<corners android:radius="7sp" />
<gradient
android:startColor="#333"
android:centerColor="#ffffff"
android:endColor="#333"
android:angle="90" />
<stroke android:width="1dp" android:color="#FFffffff" />
</shape>
</item>
But this does not give the desired effect.

You can try it this way
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="#drawable/gradient"
android:orientation="vertical" >
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:background="#drawable/gradient2"
android:orientation="vertical" >
</RelativeLayout>
</RelativeLayout>
Gradient 1
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<corners android:radius="7sp" />
<gradient
android:angle="90"
android:endColor="#D1D1D1"
android:startColor="#000" />
<stroke
android:width="1dp"
android:color="#FFffffff" />
</shape>
</item>
</layer-list>
Gradient 2
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<corners android:radius="7sp" />
<gradient
android:angle="90"
android:endColor="#000"
android:startColor="#D1D1D1" />
<stroke
android:width="1dp"
android:color="#FFffffff" />
</shape>
</item>
</layer-list>
Final Result

Use this instead
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<gradient
android:startColor="#333"
android:centerColor="#DDD"
android:endColor="#333"
android:angle="90" />
<stroke android:width="1dp" android:color="#FF333333" />
</shape>
</item>
<item android:left="4dp" android:right="4dp" android:top="1dp" android:bottom="1dp">
<shape android:shape="rectangle">
<gradient
android:startColor="#AAA"
android:centerColor="#FFF"
android:endColor="#AAA"
android:angle="90" />
</shape>
</item>
</layer-list>
But it's better to use nine-patch images

Try
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<gradient
android:startColor="#4C4C43"
android:centerColor="#B8B894"
android:endColor="#4C4C43"
android:angle="270" />
</shape>
</item>
P.S - change color according to your need
reference- http://www.learn-android-easily.com/2013/06/gradient-drawable-in-android.html

Use :
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
<gradient
android:type="linear"
android:centerX="50%"
android:startColor="#FFc0c0c0"
android:centerColor="#FFffffff"
android:endColor="#FF808080"
android:angle="270"/>
</shape>
<corners android:radius="7sp" />

how to add shadow effect on drawable in android

I have created chat bubble with drawable which looks fine, now I want to add shadow effect below the drawable so it make 3d effect.I don't want to use 9-pitch image. I just want to know how i can add shadow effect on this drawable. my code is
----right_bubble_chat_drawable
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="15dp" />
<solid android:color="#color/chatrightbubbleColor" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<size
android:height="#dimen/normal_button_height"
android:width="#dimen/normal_button_width" />
--- for corner pointer 'chat_laftarraow'
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item >
<rotate
android:fromDegrees="90"
android:toDegrees="-90"
android:pivotX="50%"
android:pivotY="50%" >
<rotate
android:fromDegrees="45"
android:toDegrees="45"
android:pivotX="-40%"
android:pivotY="86%" >
<shape
android:shape="rectangle" >
<stroke android:color="#00aaef" android:width="1dp"/>
<solid
android:color="#00aaef" />
</shape>
</rotate>
</rotate>
</item>
</layer-list>
------- I am using them like
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<View
android:id="#+id/left_chatArror"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_marginTop="6dp"
android:background="#drawable/chat_laftarraow"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="220dp"
android:layout_marginRight="-3dp"
android:orientation="horizontal"
android:layout_toLeftOf="#+id/left_chatArror"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:background="#drawable/right_bubble_chat_drawable">
</RelativeLayout>
</RelativeLayout>
Please suggest me how can I add shadow effect below the bubble as in the image below

You can try by implementing a layer-list that will act as the background for the LinearLayout and add your view inside this.
Quote from an answer to this question:
Add background_with_shadow.xml file to res/drawable. Containing:
<?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" />
<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>
Then add the the layer-list as background in your LinearLayout.
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/background_with_shadow"/>
EDIT
You can create seprate xml for creating gray image like thsis:
----right_bubble_shdw_chat_drawable
<?xml version="1.0" encoding="utf-8"?>
<shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
<corners android:radius="15dp" />
<solid android:color="#android:color/darker_gray" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<size
android:height="#dimen/normal_button_height"
android:width="#dimen/normal_button_width" />
--- for corner pointer 'chat_laftarraow_shdw'
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item >
<rotate
android:fromDegrees="90"
android:toDegrees="-90"
android:pivotX="50%"
android:pivotY="50%" >
<rotate
android:fromDegrees="45"
android:toDegrees="45"
android:pivotX="-40%"
android:pivotY="86%" >
<shape
android:shape="rectangle" >
<stroke android:color="#android:color/darker_gray" android:width="1dp"/>
<solid
android:color="#android:color/darker_gray" />
</shape>
</rotate>
</rotate>
</item>
</layer-list>
------- I am using them like
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<View
android:id="#+id/left_chatArror"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_marginTop="6dp"
android:background="#drawable/chat_laftarraow"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="220dp"
android:layout_marginRight="-3dp"
android:orientation="horizontal"
android:layout_toLeftOf="#+id/left_chatArror"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:background="#drawable/right_bubble_chat_drawable">
</RelativeLayout>
<View
android:id="#+id/left_chatArrorShdw"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignParentRight="true"
android:layout_marginTop="15dp"
android:background="#drawable/chat_laftarraow_shdw"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:maxWidth="220dp"
android:layout_marginRight="-3dp"
android:orientation="horizontal"
android:layout_toLeftOf="#+id/left_chatArror"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:background="#drawable/right_bubble_shdw_chat_drawable">
</RelativeLayout>

I am using this drawable/shadow.xml file
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#00CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape>
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#10CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape>
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#20CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<solid android:color="#android:color/white" />
<corners android:radius="3dp" />
</shape>
</item>
Note :- Root layout should be layer-list. Inside it add items.

Add round_big_green_down.xml as background to your position.
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/**round_big_green_down**"
android:paddingBottom="#dimen/button_margin_100"/>
res/drawable/round_big_green_down.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#00000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#01000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#02000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#03000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#04000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#05000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#06000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#06000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#06000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<item>
<shape>
<padding android:top="1.5dp" />
<solid android:color="#06000000" />
<corners android:radius="#dimen/button_radius" />
</shape>
</item>
<!-- White Top color -->
<item android:top="#dimen/button_margin_5">
<shape >
<gradient
android:angle="90"
android:endColor="#color/primary_color_50"
android:startColor="#color/primary_color_500" />
<corners
android:topLeftRadius="#dimen/button_radius"
android:topRightRadius="#dimen/button_radius"/>
</shape>
</item>
</layer-list>
res/values/dimens/
<dimen name="button_radius">25dp</dimen>