CircleImageView.java 文件源码

private RectF calculateBounds() {
    int availableWidth  = getWidth() - getPaddingLeft() - getPaddingRight();
    int availableHeight = getHeight() - getPaddingTop() - getPaddingBottom();

    int sideLength = Math.min(availableWidth, availableHeight);

    float left = getPaddingLeft() + (availableWidth - sideLength) / 2f;
    float top = getPaddingTop() + (availableHeight - sideLength) / 2f;

    return new RectF(left, top, left + sideLength, top + sideLength);
}