New Tutorials:   TKINTER    KOTLIN    JAVASCRIPT    SASS/SCSS    PL/SQL    Matplotlib    C++ Programs
CLOSE
   Android  Mobile Application  Gradient  
   Technology    Programming

Gradient Drawable in Android - Create Gradient Backgrounds

         
 NOVEMBER 21, 2020   by onlyklohan

We have seen the Gradient colors on many websites as backgrounds, used in App logos, like in the Instagram logo shown below, App background, buttons, progress bars, etc. A gradient makes the UI of any app, be it Mobile App or a website, more beautiful and vibrant. Many developers are using gradient in their apps and websites to make it look more attractive. So in this tutorial, we will learn how to set a gradient background for our Android App activity.

gradient background in Android app

What is Gradient?

According to Wikipedia:

In computer graphics, a color gradient specifies a range of position-dependent colors, usually used to fill a region. For example, many window managers allow the screen background to be specified as a gradient. The colors produced by a gradient vary continuously with the position, producing smooth color transitions.

A color gradient is also known as a color ramp or a color progression. In assigning colors to a set of values, a gradient is a continuous colormap, a type of color scheme.

So let's add a simple gradient to our Android App.

Step 1: Create a new Project

  1. Open Your Android Studio Click on "Start a new Android Studio project" (Learn how to setup Android Studio and create your first Android project)

  2. Choose "Empty Activity" from the project template window and click Next

  3. Enter the App Name, Package name, save location, language(Java/Kotlin, we use Java for this tutorial), and minimum SDK(we are using API 19: Android 4.4 (KitKat))

  4. Next click on the Finish button after filling the above details

  5. Now, wait for the project to finish the build.

Step 2: Creating Gradient Color

To create a gradient color we need to create a .xml file in the drawable folder. So go to app -> res -> drawable and right-click on drawable -> New -> Drawable Resource File and create gradient_drawable.xml file.

The code of gradient_drawable.xml file is shown below:

<?xml version = "1.0" encoding = "utf-8" ?>
<shape
    android:shape = "rectangle"
    xmlns:android = "http://schemas.android.com/apk/res/android" >

    <gradient
        android:startColor = "#F40303"
        android:centerColor = "#055798"
        android:endColor = "#00FF0C"
        android:angle = "90"
        android:type = "linear" />
</shape>

As you can see in the code above, we are using the gradient tag along with providing android:startColor, android:centerColor and android:endColor attributes to define the color that will be used in the gradient. So let's learn about the attributes available in the gradient drawable.

XML attributes of Gradient Drawable

Following are the attributes of the <gradient> drawable:

Attributes Description
android:startColor

Start color of the gradient.

The value of color may be in any one of "#rgb", "#argb", "#rrggbb", "#aarrggbb" forms

android:endColor

End color of the gradient

The value of color may be in any one of "#rgb", "#argb", "#rrggbb", "#aarrggbb" forms

android:centerColor

The Center color of the gradient. It may be optional but you can use it if you want

The value of color may be in any one of "#rgb", "#argb", "#rrggbb", "#aarrggbb" forms

android:centerX

X position of the center point of the gradient within the shape as a fraction of the width

0.5 is the default value

android:centerY

Y-position of the center point of the gradient within the shape as a fraction of the height

0.5 is the default value

android:angle

The angle of the gradient and it is only used with the linear gradient

It must be multiple of 45 in the range [0, 315]

android:type

It is used to set the type of gradient and the default value is linear . and it is of 3 types

  • linear

  • radial

  • sweep

android:gradientRadius

It is used to set the radius of the gradient. It is only used with the radial gradient.

Step 3: Modify activity_main.xml

Now open the activity_main.xml file and remove the default code and change the layout to RelativeLayout and set it's background to gradient background as shown below:

android:background = "@drawable/gradient_background"

with this our activity_main.xml is done and the complete code will look like:

<?xml version=  "1.0" encoding=  "utf-8" ?>
<RelativeLayout
    android:background = "@drawable/gradient_background"
    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:layout_height =  "match_parent"
    tools:context =  ".MainActivity">

</RelativeLayout>

And the output of the above is shown below:

gradient background in Android App

We can also add the gradient to different Views and layouts in our Android App. Let's cover a few other Android App components in which we can use gradient backgrounds.

Gradient background with Button:

Here we will use the gradient background for button:

<?xml version=  "1.0" encoding=  "utf-8" ?>
<RelativeLayout
    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:layout_height =  "match_parent"
    tools:context =  ".MainActivity">

    <!-- Android Simple Button -->
    <Button
        android:textSize = "24dp"
        android:background = "@drawable/gradient_background"
        android:padding = "12dp"
        android:layout_margin = "16dp"
        android:textStyle = "bold"
        android:textColor = "#ffffff"
        android:text = "Gradient Color Button"
        android:layout_width = "match_parent"
        android:layout_height = "80dp"/>

</RelativeLayout>

Output of the above code is:

gradient background in Android App

Gradient background with TextView:

Here we will use the gradient background for TextView:

<?xml version=  "1.0" encoding=  "utf-8" ?>
<RelativeLayout
    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:layout_height =  "match_parent"
    tools:context =  ".MainActivity">

<!-- Simple Text View -->
   <TextView
       android:text = "At distant inhabit amongst by. Appetite welcomed interest the goodness boy not. Estimable education for disposing pronounce her. John size good gay plan sent old roof own. Inquietude saw understood his friendship frequently yet. Nature his marked ham wished. Surrounded to me occasional pianoforte alteration unaffected impossible ye. For saw half than cold. Pretty merits waited six talked pulled you. Conduct replied off led whether any shortly why arrived adapted. Numerous ladyship so raillery humoured goodness received an. So narrow formal length my highly longer afford oh. Tall neat he make or at dull ye. "
       android:background = "@drawable/gradient_background"
       android:padding = "16dp"
       android:layout_margin = "20dp"
       android:fontFamily = "monospace"
       android:textColor = "#ffffff"
       android:textSize = "16dp"
       android:layout_width = "match_parent"
       android:layout_height = "wrap_content"/>

</RelativeLayout>

The output of the above code is:

gradient background in Android App

Gradient background with ImageView:

Here we will use the gradient background for ImageView:

<?xml version=  "1.0" encoding=  "utf-8" ?>
<RelativeLayout
    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:layout_height =  "match_parent"
    tools:context =  ".MainActivity">

  <!-- Simple Image View --> 
  <ImageView
      android:src = "@drawable/ic_launcher_foreground"
      android:background = "@drawable/gradient_background"
      android:padding = "16dp"
      android:layout_margin = "16dp"
      android:layout_width = "match_parent"
      android:layout_height = "wrap_content"/>

</RelativeLayout>

The output of the above code is:

gradient background in Android App

Gradient background with SeekBar:

Here we will use the gradient background for SeekBar:

<?xml version=  "1.0" encoding=  "utf-8" ?>
<RelativeLayout
    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:layout_height =  "match_parent"
    tools:context =  ".MainActivity">

  <!-- Simple SeekBar -->
  <SeekBar
    android:progressDrawable = "@drawable/gradient_background"
    android:padding = "8dp"
    android:layout_margin = "16dp"
    android:layout_width = "match_parent"
    android:layout_height = "80dp"/>

</RelativeLayout>

The output of the above code is:

gradient background in Android App

Conclusion:

In just 3 simple steps we have integrated and shown you the basic example for creating a Gradient Drawable in your android app. If you face any issue while doing this, please share it in the comment section below and we will be happy to help.


RELATED POSTS



Subscribe and receive amazing posts directly in your inbox.