java - RecyclerView 滚动时扩展项目之间的空间

Question

我刚刚完成我的 RecyclerView对于我的 Android Application ，但是在测试时，我发现了一个我不明白的奇怪错误。当 Activity 启动时，Recycler 中的项目 View 位于 RecyclerView 中在正确的距离。但是，一旦我开始滚动，它们就会彼此分开，直到一次只能看到一个项目，您必须滚动 distance almost equivalent在看到下一个项目之前到屏幕的那个。

这是错误的样子:

滚动 Activity 午餐前

滚动回收 View 后

如果您知道可能导致此问题的原因，我们将不胜感激。

这是 Activity 中的 RecyclerView 代码:

private ArrayList<String> imagesUrlListThumb, imagesUrlListFull = new ArrayList<String>();
private RecyclerAdapter recyclerAdapter;
private String urlRecyclerThumb = "";
private RecyclerView recyclerView;
private ImageView imgCurRecyclerView;

    imagesUrlListThumb = produit.getImgUrlThumbMul();
    recyclerAdapter = new RecyclerAdapter(getApplicationContext(), imagesUrlListThumb);
    recyclerView = (RecyclerView) findViewById(R.id.content_product_detail_recycer_view);
    RecyclerView.LayoutManager recyclerLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.HORIZONTAL, false);
    recyclerView.setLayoutManager(recyclerLayoutManager);
    recyclerView.setAdapter(recyclerAdapter);
    urlRecyclerThumb = imagesUrlListThumb.get(0);
    RecyclerItemClickSupport.addTo(recyclerView).setOnItemClickListener(new RecyclerItemClickSupport.OnItemClickListener() {
        @Override
        public void onItemClicked(RecyclerView rv, int pos, View view) {
            urlRecyclerThumb = imagesUrlListThumb.get(pos);
            Picasso.with(getApplicationContext()).load(urlRecyclerThumb).fit().into(imgCurRecyclerView);
        }
    });

回收器适配器:

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder>{

private List<String> urlThumbImg;
private Context context;

public RecyclerAdapter(Context ctx, List<String> urls){
    this.urlThumbImg = urls;
    this.context = ctx;
}

@Override
public RecyclerAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
    View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list_slideshow, parent, false);
    return new MyViewHolder(itemView);
}

@Override
public void onBindViewHolder(RecyclerAdapter.MyViewHolder holder, int position){
    String current = urlThumbImg.get(position);
    Picasso.with(context).load(current).fit().into(holder.myImgView);
}

@Override
public int getItemCount(){
    return urlThumbImg.size();
}

public class MyViewHolder extends RecyclerView.ViewHolder {
    public ImageView myImgView;

    public MyViewHolder(View view){
        super(view);
        myImgView = (ImageView) view.findViewById(R.id.imageView_slide);
    }
}
}

这是我关于回收站 View 的 xml 布局:

<!-- RECYCLER VIEW -->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="15dp"
        android:orientation="vertical">

        <ImageView
            android:id="@+id/content_product_detail_recycer_view_cur_image"
            android:layout_width="150dp"
            android:layout_height="130dp"
            android:layout_gravity="center"
            android:background="@android:color/black" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/content_product_detail_recycer_view"
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:layout_gravity="center"
            android:layout_margin="5dp"
            android:background="@android:color/darker_gray">

        </android.support.v7.widget.RecyclerView>

    </LinearLayout>

recyclerview 中项目的布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ImageView
    android:id="@+id/imageView_slide"
    android:layout_width="60dp"
    android:layout_height="60dp"
    android:layout_margin="5dp"
    android:background="@android:color/darker_gray" />

Answer 1

提供您的 Layout 和 RecyclerView 代码以帮助调试而不是猜测。

好的，问题来了:

With the release 2.3.0 there is an exciting new feature to the LayoutManager API: auto-measurement! This allows a RecyclerView to size itself based on the size of its contents. This means that previously unavailable scenarios, such as using WRAP_CONTENT for a dimension of the RecyclerView, are now possible. You’ll find all built in LayoutManagers now support auto-measurement.

由于这一变化，请务必仔细检查项目 View 的布局参数:以前忽略的布局参数(例如滚动方向上的 MATCH_PARENT)现在将得到充分考虑。

基本上你需要删除 LinearLayout

<ImageView
android:id="@+id/imageView_slide"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_margin="5dp"
android:background="@android:color/darker_gray" />

LinearLayout 宽度中的 match_parent 导致每个项目以一张图像和剩余空间适合整个屏幕。

如果你坚持使用LinearLayout，把width和height都设置成wrap_content