我得到以下结构:
<CoordinatorLayout>
<AppBar>
<CollapsingToolbar
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap"/>
</AppBar>
<NestedScrollView
android:layout_height="wrap_content"
android:fillViewport="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<ViewPager />
</NestedScrollView>
</CoordinatorLayout>
ViewPager中的片段如下所示:
<LinearLayout
android:layout_height="wrap_content">
<RecyclerView
android:layout_height="wrap_content" />
</LinearLayout>
在此片段的RecyclerView中,我得到了
<RelativeLayout
android:layout_height="wrap_content">
<...>
<RecyclerView
....
android:layout_height="wrap_content" />
</RelativeLayout>
现在的问题是,当我滚动下面的列表时,工具栏会正确折叠。但是当工具栏完全合拢时,就不会再进行滚动了,我也不知道该如何实现。
对于每个RecyclerView,我正在使用LinearLayoutManager,并将AutoMeasureEnabled设置为true。此外,HasFixedSize-Flags设置为false。
有任何想法吗?
//编辑:内容不固定;它通过reactUI传入。
最佳答案
您必须使视图寻呼机具有动态高度,我在NestedScrollView内的自定义视图寻呼机下方使用,
public class CustomPager extends ViewPager {
private View mCurrentView;
public CustomPager(Context context) {
super(context);
}
public CustomPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mCurrentView == null) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
return;
}
int height = 0;
mCurrentView.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
int h = mCurrentView.getMeasuredHeight();
if (h > height) height = h;
heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
public void measureCurrentView(View currentView) {
mCurrentView = currentView;
requestLayout();
}
public int measureFragment(View view) {
if (view == null)
return 0;
view.measure(0, 0);
return view.getMeasuredHeight();
}
}
并将下面的方法重写到FragmentStatePagerAdapter或FragmentPagerAdapter中
private int mCurrentPosition = -1;
@Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
super.setPrimaryItem(container, position, object);
if (position != mCurrentPosition) {
Fragment fragment = (Fragment) object;
CustomPager pager = (CustomPager) container;
if (fragment != null && fragment.getView() != null) {
mCurrentPosition = position;
pager.measureCurrentView(fragment.getView());
}
}
}