I would like to animate a gradient to show this background style:

• This at minute 0:36-0:41.
• Or in This article.

The main reason I want to do it is in a loading screen and in a dialog form popup.

I have the following gradient:

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <gradient
        android:type="radial"
        android:gradientRadius="100%p"
        android:startColor="#F1F1F1"
        android:endColor="#83a6aa" />
</shape>

The colors or the width and height does not matter to me, I need this animation, I would like to know how to do it so I can do it for as many colors or situation I desire (it also get like screen-lags type of visible bugs).

CodePudding user response：

I had almost the same question lol, this is what I found out that worked for me at the time (note that the library is in archive mode, but you can still use the code or forked it):

Github Library

-- Layout:

<com.skyfishjy.library.RippleBackground
        android:id="@ id/ripple_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:rb_color="#20000000"
        app:rb_duration="3000"
        app:rb_radius="22dp"
        app:rb_rippleAmount="12"
        app:rb_scale="22"
        app:rb_type="strokeRipple"
        app:rb_strokeWidth="1dp">

        <!-- like any layout, insert items here like a normal layout-->

</com.skyfishjy.library.RippleBackground>

In the java class in which you use this layout:

final RippleBackground rippleBackground=(RippleBackground)findViewById(R.id.content);
// override the methods: onStart, onResume and insert to them the next line
rippleBackground.startRippleAnimation();
// if you wish to stop the animation use:
rippleBackground.stopRippleAnimation();

note that you can start and stop the animation also with click from any type of onClickListener