RecyclerView中的视图与父宽度不匹配

Question

我有一个水平的Recyclerview:

<android.support.v7.widget.RecyclerView
        android:id="@+id/rvRecommendedVendors"
        android:scrollbars="none"
        android:layout_width="match_parent"
        android:layout_height="225dp"
        android:visibility="visible"
        android:layout_below="@+id/llRecommendedVendors"
        android:overScrollMode="never"
        android:background="@color/dark_blue"
        />

它有一个项目:

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

    <ImageButton
        android:layout_width="match_parent"
        android:layout_height="225dp"
        android:id="@+id/ibRecommendedCoverPhoto"
        android:src="@drawable/sample_cover_image"
        android:background="@android:color/darker_gray"
        android:scaleType="centerCrop"/>
</LinearLayout>

两个控件的宽度都设置为match_parent但是,imagebutton不会"匹配"其父级的宽度.

我记录了宽度:

recyclerView高度:338
recyclerView宽度:480

这是来自Recyclerview方法onCreateViewHolder:

  @Override
    public RecommendedVendorsViewHolder onCreateViewHolder(ViewGroup vg, int viewType) {
    View v = LayoutInflater.from(vg.getContext()).inflate(R.layout.item_recommended_list, vg, false);

我记录了视图的高度和宽度:

查看v高度:338
查看宽度:327

我尝试以编程方式设置宽度:

@Override
    public RecommendedVendorsViewHolder onCreateViewHolder(ViewGroup vg, int viewType) {
        View v = LayoutInflater.from(vg.getContext()).inflate(R.layout.item_recommended_list, vg, false);
        RecyclerView.LayoutParams params= (RecyclerView.LayoutParams)v.getLayoutParams();
        params.width=480;
        v.setLayoutParams(params);

        return vh;
    }

查看v高度:338
查看宽度:480

它工作,但我不想每次调整视图的大小.

Answer 1

RecyclerView 在正确定位它和/或其子视图时非常糟糕。尝试

@Override
public ViewHolder onCreateViewHolder(final ViewGroup parent, final int viewType) {
    final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    final View v = inflater.inflate(R.layout.item, parent, false);

    // match_parent won't work for RecyclerView (sigh)
    final ViewGroup.LayoutParams lp = v.getLayoutParams();
    lp.width = parent.getWidth();
    lp.height = parent.getHeight();
    v.setLayoutParams(lp);

    return new ViewHolder(v);
}

它基本上取代了子视图中高度和宽度的 match_parent 。对于您的特定情况，您只需设置宽度即可。