我有 Recyclerview
其下 Coordinatorlayout
> NestedScrollview
> ViewPager
和 ViewPager
有3个碎片,其中一个有图片库,它是借助于 Recyclerview
. 每当我试图向上或向下滚动时,它根本无法滚动。我已经设置了 photosRecycler.setNestedScrollingEnabled(false);
当我删除这一行时,我得到的滚动只在下边工作,当我试图向后移动时,它与父体一起向上移动。Nestedscrollview
.
我的布局管理器也显示StaggeredGrid为Grid,我需要得到这样的布局。
这是我的Nestedscrollview的父版图。
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:background="?android:attr/colorBackground"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<com.google.android.material.appbar.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:colorBackground">
<ImageView
android:layout_width="match_parent"
android:layout_height="500dp"
android:src="@color/custom_transparent_colorBlack"
android:scaleType="centerCrop"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<de.hdodenhof.circleimageview.CircleImageView
android:layout_width="128dp"
android:layout_height="128dp"
app:layout_constraintBottom_toBottomOf="@+id/coverPhoto"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/coverPhoto"
app:layout_constraintVertical_bias="0.44"
tools:srcCompat="@tools:sample/avatars" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.appbar.CollapsingToolbarLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:id="@+id/up_NestedScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="5dp"
android:paddingRight="5dp"
>
<com.google.android.material.tabs.TabLayout
android:id="@+id/tabItemes"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabGravity="fill"
app:tabPaddingBottom="0dp"
app:tabPaddingEnd="0dp"
app:tabPaddingStart="0dp"
app:tabPaddingTop="0dp"
app:tabIndicatorHeight="0dp"
app:tabMode="fixed"
app:tabTextColor="@color/black"
app:tabSelectedTextColor="@color/primary"
app:tabIndicatorColor="@color/primary_light">
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="About" />
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Media" />
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Con" />
</com.google.android.material.tabs.TabLayout>
<androidx.viewpager.widget.ViewPager
android:layout_below="@id/tabItemes"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
</androidx.core.widget.NestedScrollView>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
图片库片段
public class UserPhoto_fragment extends Fragment {
public static final String TAG="### USER PHOTO ####";
RecyclerView photosRecycler;
fetchPhoto_Adapter adapter;
StaggeredGridLayoutManager layoutManager;
ArrayList<String> ImageList;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.userprofile_photos,container,false);
setRetainInstance(true);
photosRecycler=view.findViewById(R.id.userPhotos_recycler);
layoutManager= new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
layoutManager.setGapStrategy(StaggeredGridLayoutManager.GAP_HANDLING_NONE);
ImageList=new ArrayList<>();
SpacesItemDecoration itemDecoration = new SpacesItemDecoration(16);
photosRecycler.addItemDecoration(itemDecoration);
photosRecycler.setLayoutManager(layoutManager);
photosRecycler.setHasFixedSize(true);
photosRecycler.setNestedScrollingEnabled(false);
return view;
}
@Override
public void onResume() {
super.onResume();
Log.d(TAG, "onResume: User Photo Fragment "+getView()+ ImageList.size() );
if (ImageList.size()==0){
new fetch_photo().execute();
}
}
public class fetchPhoto_Adapter extends RecyclerView.Adapter<fetchPhoto_Adapter.ViewHolder>{
@NonNull
@Override
public fetchPhoto_Adapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
LayoutInflater inflater= (LayoutInflater) viewGroup.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.userprofile_photogallery,viewGroup,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(fetchPhoto_Adapter.ViewHolder viewHolder, int i) {
Glide.with(getActivity()).load(ImageList.get(i)).apply(new RequestOptions().centerCrop()).into(viewHolder.image);
}
@Override
public int getItemCount() {
if (ImageList!=null && ImageList.size()>0){
return ImageList.size();
}else {
return 0;
}
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView image;
public ViewHolder(View itemView) {
super(itemView);
image = itemView.findViewById(R.id.UserProfile_photoThumb);
}
}
}
}
图片库的布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_marginTop="20dp"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/userPhotos_recycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
android:scrollbars="vertical">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
我在这段代码中遇到了两个问题
请帮我解决这些问题,谢谢
你需要 嵌套的可滚动主机 滚入 RecyclerView
对我来说,使用以下布局树就可以了
activity.xml
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".view.MainActivity">
<androidx.viewpager2.widget.ViewPager2
android:id="@+id/vp_views"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" />
</androidx.constraintlayout.widget.ConstraintLayout>
fragment.xml
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:constraint="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
...
<com.anatoli.thebattleofcards.fabric.NestedScrollableHost
android:id="@+id/rv_items_host"
android:layout_width="0dp"
android:layout_height="wrap_content"
constraint:layout_constraintEnd_toEndOf="parent"
constraint:layout_constraintStart_toStartOf="parent"
constraint:layout_constraintTop_toTopOf="parent">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_items"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" <!-- change orientation if needs -->
android:paddingStart="@dimen/layout_padding_small"
android:paddingEnd="@dimen/layout_padding_small"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
</com.anatoli.thebattleofcards.fabric.NestedScrollableHost>
...
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
我认为你应该把你的tabLayout放在appBar中。
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:background="?android:attr/colorBackground"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<android.support.design.widget.CollapsingToolbarLayout
.
.
.
/>
<ImageView
.
.
.
/>
</android.support.design.widget.CollapsingToolbarLayout>
<android.support.design.widget.TabLayout
.
.
.
/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
然后把嵌套滚动放在你的碎片里。阅读这篇文章。CollapsingToolbar with ViewPager and fragments(折叠工具栏)。
也许你的nestedScrollView没有覆盖整个屏幕。试着在您的嵌套滚动视图中添加以下内容
android:fillViewport="true"
设置好适配器后,试着把这行。
ViewCompat.setNestedScrollingEnabled(recyclerView, false);
我也遇到过同样的要求,但用不同的方式解决了。
app:layout_behavior="@string/appbar_scrolling_view_behavior"
将此属性设置为您的CoordinatorLayout中的主要内容布局。
<string name="appbar_scrolling_view_behavior" translatable="false">com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior</string>
该布局看起来像
<androidx.coordinatorlayout.widget.CoordinatorLayout >
<com.google.android.material.appbar.AppBarLayout>
<androidx.appcompat.widget.Toolbar>
<androidx.constraintlayout.widget.ConstraintLayout>
<ImageView />
//Header content
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>
<com.google.android.material.tabs.TabLayout />
</com.google.android.material.appbar.AppBarLayout>
<LinearLayout
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<androidx.viewpager.widget.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/light_gray">
</androidx.viewpager.widget.ViewPager>
</LinearLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
而主碎片的父视图必须是嵌套的滚动视图与 app:layout_behavior
注:我的片段包含线性布局,所以我只用了 wrap_content
如果你使用的是回收器视图,你应该在片段中把它压平。
因为viewPager直接在CoordinatorLayout里面,而不是在recyclerView里面,所以viewPager应该有滚动布局行为,而不是你的recyclerview。
<androidx.viewpager.widget.ViewPager
android:layout_below="@id/tabItemes"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
像这样设置StaggeredGridLayoutManager。
StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3, LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(staggeredGridLayoutManager); // set LayoutManager to RecyclerView
为了使StaggeredGridLayout工作,你必须不将你的imageView scaletype设置为cropCenter,并且包含imageView元素的cardView的高度应该设置为包裹内容而不是固定的。
<android.support.v7.widget.cardview
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:cardcornerradius="4dp"
app:cardusecompatpadding="true">
<linearlayout
android:background="@color/colorPrimary"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<imageview
android:adjustviewbounds="true"
android:id="@+id/placePic"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:scaletype="fitXY" />
</linearlayout>
</android.support.v7.widget.cardview>