将enterAlways添加到Cheesesquare演示的滚动标志:
导致错误的布局:
在向下滚动期间,标题正确进入,但它不会停在正确的位置.滚动进一步取代零件:背景图像显示在错误的位置,工具栏因背景颜色的变化而变得不可见. (我还在这里为工具栏添加了一个colorPrimary背景,使其更加明显,但问题当然不依赖于颜色).这些库是截至今天的最新版本,23.1.0.
最佳答案
我通过对AppBarLayout类源代码进行了一些修补来解决了这个问题.显然他们并不认为人们会这样使用它.或者他们做了,我离开了.无论如何它对我有用.
您需要对此方法进行一些小改动.寻找SCROLL_FLAG_EXIT_UNTIL_COLLAPSED
/**
* Return the scroll range when scrolling down from a nested pre-scroll.
*/
private int getDownNestedPreScrollRange() {
if (mDownPreScrollRange != INVALID_SCROLL_RANGE) {
// If we already have a valid value,return it
return mDownPreScrollRange;
}
int range = 0;
for (int i = getChildCount() - 1; i >= 0; i--) {
final View child = getChildAt(i);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
final int childHeight = child.getMeasuredHeight();
final int flags = lp.mScrollFlags;
if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) {
// First take the margin into account
range += lp.topMargin + lp.bottomMargin;
// The view has the quick return flag combination...
if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) {
// If they're set to enter collapsed,use the minimum height
range += ViewCompat.getMinimumHeight(child);
// This is what is missing...
} else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) == LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) {
range += childHeight - ViewCompat.getMinimumHeight(child);
} else {
// Else use the full height
range += childHeight;
}
} else if (range > 0) {
// If we've hit an non-quick return scrollable view,and we've already hit a
// quick return view,return now
break;
}
}
return mDownPreScrollRange = range;
}
如果使用,可能需要递减状态栏高度
“机器人:fitsSystemWindows =” 真”.
希望能帮助到你.您需要从设计库中复制一些类以允许所有导入和输入.一些将公开的方法.
干杯.