Android 从代码填充GridLayout不需要'；不能给出与XML相同的结果

我尝试在代码中复制以下XML：

<GridLayout
    android:id="@+id/row2Grid"
    android:layout_row="1"
    android:layout_column="0"
    android:layout_rowWeight="40"

    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:alignmentMode="alignMargins"
    android:columnCount="3"
    android:columnOrderPreserved="true"
    android:padding="0px"
    android:rowCount="2"
    >

    <!-- Box 1 -->
    <androidx.cardview.widget.CardView
        app:cardBackgroundColor="#00ff00"
        android:layout_width="0dp"
        android:layout_height="0dp"

        android:layout_rowWeight="8"
        android:layout_column="0"
        android:layout_columnWeight="6"

        android:layout_marginRight="3dp"
        android:layout_marginBottom="3dp">

    </androidx.cardview.widget.CardView>

    <!-- Box 2 -->
    <androidx.cardview.widget.CardView
        app:cardBackgroundColor="#ff0000"
        android:layout_width="0dp"
        android:layout_height="0dp"

        android:layout_rowWeight="8"
        android:layout_column="1"
        android:layout_columnWeight="6"

        android:layout_marginRight="3dp"
        android:layout_marginBottom="3dp"
        app:cardElevation="8dp">

    </androidx.cardview.widget.CardView>

</GridLayout>

但它不起作用，只产生以下结果：

---

我做错了什么？

你知道，当你为一个问题挣扎了几个小时，然后你一问这个问题，你就看到了自己的解决方案

我一贴出问题就看到了答案。这当然是由于我首先这样做：

GridLayout.LayoutParams cardViewLayoutParams = new GridLayout.LayoutParams(GridLayout.spec(0), GridLayout.spec(row2children));
cardViewLayoutParams.columnSpec = GridLayout.spec(0,8.0f);
cardViewLayoutParams.rowSpec = GridLayout.spec(0,8.0f);

当我创建

cardViewLayoutParams

时，我在构造函数中指定cardView的行和列属性，但在其正下方覆盖它们。将此更改为以下内容：

GridLayout.LayoutParams cardViewLayoutParams = new GridLayout.LayoutParams();
cardViewLayoutParams.columnSpec = GridLayout.spec(row2children,8.0f);
cardViewLayoutParams.rowSpec = GridLayout.spec(0,8.0f);

让一切都按预期进行

GridLayout.LayoutParams cardViewLayoutParams = new GridLayout.LayoutParams();
cardViewLayoutParams.columnSpec = GridLayout.spec(row2children,8.0f);
cardViewLayoutParams.rowSpec = GridLayout.spec(0,8.0f);