GradientDrawable in Android

A Drawable with a color gradient for buttons, backgrounds, etc.

It can be defined in an XML file with the <shape> element. For more information, see the guide to Drawable Resources.

<?xml version="1.0"encoding="utf-8"?>

<gradient

    android:angle="-90"

    android:endColor="#A71C1C"

    android:startColor="#7c0000"

    android:type="radial" />

Gradient is used in shape and it looks like this.

<?xml version="1.0"encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android" >

    <gradient

        android:angle="90"

        android:endColor="#A71C1C"

        android:startColor="#7c0000" />

</shape> 

another example of shape drawable: 

<?xml version="1.0" encoding="UTF-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

    android:shape="rectangle" >

    <stroke

        android:width="2dp"

        android:color="#FFFFFFFF" />

    <gradient

        android:angle="225"

        android:endColor="#DD2ECCFA"

        android:startColor="#DD000000" />

    <corners

        android:bottomLeftRadius="7dp"

        android:bottomRightRadius="7dp"

        android:topLeftRadius="7dp"

        android:topRightRadius="7dp" />

</shape>

Attributes Name and its meaning for gradient drawable in android :

android:type

There are 3 types of gradients, the default and the one for this question is "linear". The other 2 are "radial" and "sweep".

android:angle

Counter-clockwise rotation of the gradient, where 0 is | start color --> end color | (horizontally).

android:startColor

Color the gradient starts from, start is defined by the rotation.

android:endColor

Color the gradient ends with, end is defined by the rotation.

android:centerColor

There can also be a color in between the start and end color, if desired.

 We can use gradient in selector also.

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_pressed="true"><shape>

            <gradient android:angle="270" android:endColor="@color/button_pressed" android:startColor="@color/button_pressed" />

            <stroke android:width="3dp" android:color="@color/button_pressed" />

            <corners android:radius="3dp" />

            <padding android:bottom="5dp" android:left="5dp" android:right="5dp" android:top="5dp" />

        </shape></item>

    <item android:state_focused="true"><shape>

            <gradient android:angle="270" android:endColor="@color/info_normal" android:startColor="@color/info_normal" />

            <stroke android:width="3dp" android:color="@color/info_normal" />

            <corners android:radius="3dp" />

            <padding android:bottom="5dp" android:left="5dp" android:right="5dp" android:top="5dp" />

        </shape></item>

    <item><shape>

            <gradient android:angle="270" android:endColor="@color/info_normal" android:startColor="@color/info_normal" />

            <stroke android:width="3dp" android:color="@color/info_normal" />

            <corners android:radius="3dp" />

            <padding android:bottom="5dp" android:left="5dp" android:right="5dp" android:top="5dp" />

        </shape></item>

</selector>

One more thing is useful for shape called shape type"

there are four types of shape available in android.

rectangle	A rectangle that fills the containing View. This is the default shape.
oval	An oval shape that fits the dimensions of the containing View.
line	A horizontal line that spans the width of the containing View. This shape requires the <stroke> element to define the width of the line.
ring	A ring shape.

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