短视频软件开发，各个图标自带渐变色效果

短视频软件开发，各个图标自带渐变色效果实现的相关代码

ColorGradient.java:

 

public class ColorGradient extends View {
    public ColorGradient(Context context) {
        super(context);
    }
    public ColorGradient(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        animation();
    }
    public ColorGradient(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    private void animation(){
        ValueAnimator colorAnim = ObjectAnimator.ofInt(this, "backgroundColor", RED, BLUE);
        colorAnim.setDuration(4000);
        colorAnim.setEvaluator(new MyColorEvaluator());
        colorAnim.setRepeatCount(ValueAnimator.INFINITE);
        colorAnim.setRepeatMode(ValueAnimator.REVERSE);
        colorAnim.start();
    }
    
}

​MyColorEvaluator.java:

 

public class MyColorEvaluator implements TypeEvaluator<Integer> {
    float[] startHsv=new float[3];
    float[] endHsv=new float[3];
    float[] outHsv=new float[3];
    @Override
    public Integer evaluate(float fraction, Integer startValue, Integer endValue) {
        Color.colorToHSV(startValue,startHsv);
        Color.colorToHSV(endValue,endHsv);
        int alpha = startValue >> 24 + (int) ((endValue >> 24 - startValue >> 24) * fraction);
        // 计算当前动画完成度（fraction）所对应的颜色值
        if (endHsv[0] - startHsv[0] > 180) {
            endHsv[0] -= 360;
        } else if (endHsv[0] - startHsv[0] < -180) {
            endHsv[0] += 360;
        }
        outHsv[0] = startHsv[0] + (endHsv[0] - startHsv[0]) * fraction;
        if (outHsv[0] > 360) {
            outHsv[0] -= 360;
        } else if (outHsv[0] < 0) {
            outHsv[0] += 360;
        }
        outHsv[1]=startHsv[1]+(endHsv[1]-startHsv[1])*fraction;
        outHsv[2]=startHsv[2]+(endHsv[2]-startHsv[2])*fraction;
        return Color.HSVToColor(alpha,outHsv);
    }
}

 

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