Converting CSS RadialGradient to Android Drawable: How to Do It

Converting a CSS radial-gradient to Android has been a challenge for me, as the CSS version includes multiple colors and stops. Here is an example of the CSS code:

background-image: radial-gradient(circle at 24% 50%, #ffffff, #c0e3e0 20%, #a4c4d7 61%, #000000);

I attempted to replicate this in Android using the following XML shape code:

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

<gradient
    android:centerX="36%"
    android:centerY="50%"
    android:endColor="#000000"
    android:gradientRadius="300"
    android:startColor="#ffffff"
    android:type="radial"
    />
 </shape>

However, I realized that it was not possible to include all the colors and stops using this method.

Instead, I decided to use RadialGradient in my Java code:

 RadialGradient radialGradient = new RadialGradient(0.25f, 0.45f, 140.f, new int[]{
            ContextCompat.getColor(context, R.color.background_gradient_start_color),
            ContextCompat.getColor(context, R.color.background_gradient_second_color),
            ContextCompat.getColor(context, R.color.background_gradient_third_color),
            ContextCompat.getColor(context, R.color.background_gradient_end_color)}, new float[]{1.0f, 0.2f, .61f, 1.0f},
            Shader.TileMode.CLAMP);

Unfortunately, I am facing an issue where I cannot set the RadialGradient as the background of my RelativeLayout because it is not an instance of android.graphics.Drawable. Can anyone suggest a solution?

Answer №1

If you want to create a custom background with multiple layers, you can achieve this using layer-list in Android:

<?xml version="1.0" encoding="utf-8"?>
<layer-list>
    <item>
        <shape xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="rectangle">
            <gradient
                android:centerX="36%"
                android:centerY="50%"
                android:endColor="#33c0e3e0"
                android:gradientRadius="300"
                android:startColor="#ffffff"
                android:type="radial"
                />
        </shape>
    </item>
    <item>
        <shape xmlns:android="http://schemas.android.com/apk/res/android"
            android:shape="rectangle">
            <gradient
                android:centerX="36%"
                android:centerY="50%"
                android:endColor="#000000"
                android:centerColor="@color/colorAccent"
                android:gradientRadius="600"
                android:startColor="#9ca4c4d7"
                android:type="radial"
                />
        </shape>
    </item>
</layer-list>

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