DefaultHeaderTransformer.java 文件源码

private void applyProgressBarSettings() {
    if (mHeaderProgressBar != null) {
        ShapeDrawable shape = new ShapeDrawable();
        shape.setShape(new RectShape());
        shape.getPaint().setColor(mProgressDrawableColor);
        ClipDrawable clipDrawable = new ClipDrawable(shape, Gravity.CENTER, ClipDrawable.HORIZONTAL);

        mHeaderProgressBar.setProgressDrawable(clipDrawable);
    }
}