java - Recyclerview 不在嵌套的 ScrollView 内滚动

Question

我有 Recyclerview在 Coordinatorlayout 下> NestedScrollview > ViewPager和 ViewPager有 3 个 fragment ，一个有图片库，在 Recyclerview 的帮助下工作.每当我尝试向上或向下滚动时，它根本不会滚动。我已经设置了photosRecycler.setNestedScrollingEnabled(false);一旦我删除这条线，我就只能向下滚动，当我试图向上移动时，它会随着父 Nestedscrollview 向上移动.

我的布局管理器也将 StaggeredGrid 显示为 Grid 我需要获得这种布局



这是我的 Nestedscrollview 的父布局

<?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 fragment

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>

我面临此代码的 2 个问题

Recyclerview 在嵌套 ScrollView 中不起作用。

StaggeredGridLayoutManager 正在显示像 GridLayoutManager

这样的图像

请帮我解决这些问题。谢谢

Answer 1

您需要NestedScrollableHost滚动 RecyclerView
使用以下布局树为我工作
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>