创建gridlayout无法在android中运行

Question

在我的Android应用程序中，我想制作一个5x5网格的gridlayout。任何行/列之间没有间距。网格应与父宽度/高度匹配，边距为10dp。此外，所有单元格应具有相同的宽度和高度（即所有宽度相同，即使宽度不等于高度，所有高度也相同）。

这是我到目前为止，但没有显示

public class ColorGrid {

    private Context context;
    private RelativeLayout container = null;
    private GridLayout gridlayout = null;

    public ColorGrid(RelativeLayout container) {
        this.context = container.getContext();
        this.container = container;
        this.gridlayout = createGrid();


        for(int i=0; i<25; i+=1) {
            addCell();
        }

        container.addView(gridlayout);
    }

    private GridLayout createGrid() {
        GridLayout gridview = new GridLayout(context);

        gridview.setColumnCount(5);
        gridview.setRowCount(5);

        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
        params.setMargins(10, 10, 10, 10);
        gridview.setLayoutParams(params);

        return gridview;
    }

    private void addCell() {
        View cell = new View(context);
        cell.setBackgroundColor(Color.parseColor("#ffffff"));
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(0, 0, 1.0f);
        cell.setLayoutParams(params);

        gridlayout.addView(cell);
    }

    public void dismiss() {
        if (container != null && gridlayout != null) {
            container.removeView(gridlayout);
        }
    }
}

有谁知道什么是错的？

由于