安卓RecyclerView网格项目水平和垂直居中，不打乱

import android.graphics.Rect;
import android.view.View;

import androidx.recyclerview.widget.RecyclerView;

public class CenterItemDecoration extends RecyclerView.ItemDecoration {

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        int itemCount = parent.getAdapter().getItemCount();
        int itemPosition = parent.getChildAdapterPosition(view);

        // 计算每行和每列的数量
        int spanCount = getSpanCount(parent);
        int rowCount = itemCount / spanCount;

        // 计算水平和垂直方向上的偏移量
        int horizontalOffset = (parent.getWidth() - parent.getPaddingLeft() - parent.getPaddingRight() - view.getWidth() * spanCount) / (spanCount + 1);
        int verticalOffset = (parent.getHeight() - parent.getPaddingTop() - parent.getPaddingBottom() - view.getHeight() * rowCount) / (rowCount + 1);

        int column = itemPosition % spanCount;
        int row = itemPosition / spanCount;

        // 设置每个项目的偏移量
        outRect.left = horizontalOffset * (column + 1) - view.getWidth() * column;
        outRect.right = horizontalOffset * (spanCount - column) - view.getWidth() * (spanCount - column - 1);
        outRect.top = verticalOffset * (row + 1) - view.getHeight() * row;
        outRect.bottom = verticalOffset * (rowCount - row) - view.getHeight() * (rowCount - row - 1);
    }

    private int getSpanCount(RecyclerView parent) {
        RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
        if (layoutManager instanceof GridLayoutManager) {
            return ((GridLayoutManager) layoutManager).getSpanCount();
        } else {
            return 1;
        }
    }
}

RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
recyclerView.addItemDecoration(new CenterItemDecoration());