android recyclerView水平和垂直间距

大家好，我对 android 很陌生，我在 recyclerview 方面遇到了问题。我试图在回收视图中的图像视图之间添加空间，但没有成功。

我想要的是

怎么了

以下是我的实现ItemOffsetDecoration.java

public class ItemOffsetDecoration extends RecyclerView.ItemDecoration {
    private int itemOffset;

    public ItemOffsetDecoration(int itemOffset) {
        itemOffset = itemOffset;
    }

    public ItemOffsetDecoration(@NonNull Context context, @DimenRes int itemOffsetId) {
        this(context.getResources().getDimensionPixelSize(itemOffsetId));
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
                               RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        outRect.set(itemOffset, itemOffset, itemOffset, itemOffset);
    }
}

购物.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:background="@drawable/shopping_bg"
    tools:context=".activities.HomepageActivity$PlaceholderFragment">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/shoppingRV"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipToPadding="false"
            android:padding="@dimen/grid_horizontal_spacing"/>
</RelativeLayout>

购物.java

public class Shopping extends Fragment implements InstaPukkeiRecyclerViewAdapter.ItemClickListener {
    InstaPukkeiRecyclerViewAdapter adapter;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.tab_shopping, container, false);
        processRV(rootView);
        return rootView;
    }
    private void processRV(View layout) {
        RecyclerView recyclerView = (RecyclerView) layout.findViewById(R.id.shoppingRV);
        int noOfColumns = 3;
        recyclerView.setLayoutManager(new GridLayoutManager(getContext(), noOfColumns));
        adapter = new InstaPukkeiRecyclerViewAdapter(getContext(), LogoIds.SHOPPING_SITE_LOGOS);
        adapter.setClickListener(this);
        recyclerView.setAdapter(adapter);
        recyclerView.addItemDecoration(new ItemOffsetDecoration(getContext(), R.dimen.grid_horizontal_spacing));
    }
}

请在这里帮助我。提前致谢。

EDITitem_layout.xml

<?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">

    <ImageView
        android:id="@+id/logoImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="fitXY"
        android:adjustViewBounds="true" />
</LinearLayout>

<?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="wrap_content">

<ImageView
    android:marginLeft="18dp"
    android:marginRight="18dp"
    android:id="@+id/logoImageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scaleType="fitXY"
    android:adjustViewBounds="true" />
  </LinearLayout>

使用项目 XML 中的此布局更改项目布局。您使父级（LinearLayout）高度与父级匹配，这就是您获得垂直全屏空间的原因