SeekBarPreference.java 文件源码

private void styleSeekBar() {
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    final Drawable progressDrawable = mSeekBar.getProgressDrawable();
    if (progressDrawable != null) {
      if (progressDrawable instanceof LayerDrawable) {
        LayerDrawable ld = (LayerDrawable) progressDrawable;
        int layers = ld.getNumberOfLayers();
        for (int i = 0; i < layers; i++) {
          ld.getDrawable(i).mutate().setColorFilter(mTintColor, PorterDuff.Mode.SRC_ATOP);
        }
      } else {
        progressDrawable.mutate().setColorFilter(mTintColor, PorterDuff.Mode.SRC_ATOP);
      }
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
      final Drawable thumb = mSeekBar.getThumb();
      if (thumb != null) {
        thumb.mutate().setColorFilter(mTintColor, PorterDuff.Mode.SRC_ATOP);
      }
    }
  }
}