我想在recyclerview中空间网格项目,它现在适用于所有方面(顶部,底部......等)
我想仅从顶部应用空间,右侧任何人都可以帮助我更改现有代码。
public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
private int spanCount;
private int spacing;
private boolean includeEdge;
public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
this.spanCount = spanCount;
this.spacing = spacing;
this.includeEdge = includeEdge;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view); // item position
int column = position % spanCount; // item column
if (includeEdge) {
outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)
outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)
if (position < spanCount) { // top edge
outRect.top = spacing;
}
outRect.bottom = spacing; // item bottom
} else {
outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)
outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f / spanCount) * spacing)
if (position >= spanCount) {
outRect.top = spacing; // item top
}
}
}
}
下面是适配器的项目xml。
在这个xml中我根据需要给出了保证金,但它不会影响布局。
虽然,我已经从装饰类中评论了2行代码(来自其他部分)并且现在正在使用它。
/*if (position >= spanCount) { outRect.top = spacing; // item top }*/
XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="@dimen/margin_120dp"
android:layout_height="@dimen/margin_120dp"
android:background="@color/white"
android:elevation="@dimen/margin_2"
android:layout_marginRight="@dimen/margin_2"
android:layout_marginTop="@dimen/margin_2"
android:orientation="vertical"
app:cardCornerRadius="@dimen/margin_2"
app:cardPreventCornerOverlap="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/category_item"
android:layout_width="@dimen/margin_60dp"
android:layout_height="@dimen/margin_60dp"
android:layout_centerHorizontal="true"
android:layout_gravity="center"
android:layout_marginTop="@dimen/margin_10dp"
android:src="@drawable/home" />
<TextView
android:id="@+id/cat_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_gravity="center"
android:gravity="bottom"
android:padding="@dimen/margin_5dp"
android:text="@string/app_name" />
</RelativeLayout>
</android.support.v7.widget.CardView>