效果如下：

那麼我想要一個類似IOS的載入呢？

看上面的效果FadingCircle跟IOS的效果相似，那麼我們就基於FadingCircle改成IOS載入的效果

首先：在sprite目錄下建立 RectLayoutContainer.java

public abstract class RectLayoutContainer extends SpriteContainer {

    @Override
public void drawChild(Canvas canvas) {
        for (int i = 0; i < getChildCount(); i++) {
            Sprite sprite = getChildAt(i);
 
            int count = canvas.save();
canvas.rotate(i * 360 / getChildCount(),
getBounds().centerX(),
getBounds().centerY());
sprite.draw(canvas);
canvas.restoreToCount(count);
}
    }

    @Override
protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);
bounds = clipSquare(bounds);
 
        int radius = (int) (bounds.width() / getChildCount() / 2);
        int left = bounds.centerX() - radius;
        int right = bounds.centerX() + radius;
        for (int i = 0; i < getChildCount(); i++) {
            Sprite sprite = getChildAt(i);
sprite.setDrawBounds(left, bounds.top, right, 
 
bounds.top + radius * 5);
}
    }
}

在style目錄下建立FadingRect.java  ，注意，我們是要畫一個矩形，所以繼承的是RectSprite

public class FadingRect extends RectLayoutContainer {

    @Override
public Sprite[] onCreateChild() {
        RectItem[] dots = new RectItem[12];
        for (int i = 0; i < dots.length; i++) {
            dots[i] = new RectItem();
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                dots[i].setAnimationDelay(1200 / 12 * i);
} else {
                dots[i].setAnimationDelay(1200 / 12 * i + -1200);
}
        }
        return dots;
}

    private class RectItem extends RectSprite {

        RectItem() {
            setAlpha(0);
}

        @Override
public ValueAnimator onCreateAnimation() {
            float fractions[] = new float[]{0f, 0.39f, 0.4f, 1f};
            return new SpriteAnimatorBuilder(this).
                    alpha(fractions, 50, 50, 255, 50).
                    duration(1200).
                    easeInOut(fractions).build();
}
    }
}

然後在列舉類Style.java中新增 ：

FADING_RECT(15)； 

在SpriteFactory.Java增加：

case FADING_RECT:
                sprite = new FadingRect();
                break;

在然後向XML檔案attr、style新增相對應的就可以了！