ProfilePortraitView.java 文件源码

void positionStickyHeader() {
    // sticky header
    final int top = mListHeader.getTop();
    final int stickyHeight = mStickyHeader.getMeasuredHeight();
    final int headerHeight = mListHeader.getMeasuredHeight();
    final int delta = headerHeight - stickyHeight;
    final int pos = delta + top;
    // reposition header
    mStickyHeader.setTranslationY(Math.max(pos,0));
    if (pos < 0 && !mIsStuck) {
        mIsStuck = true;
        makeSlideAnimator(5000, 10000, (ClipDrawable)mStickyHeader.getBackground()).start();
    } else if (pos > 0 && mIsStuck) {
        mIsStuck = false;
        makeSlideAnimator(10000, 5000, (ClipDrawable)mStickyHeader.getBackground()).start();
    }
}