Achartengine 无法解析符号 setLineWidth

Achartengine cannot resolve symbol setLineWidth

我正在尝试在 achartengine 中创建 renderer,但 Android 给我这个错误:

Cannot resolve symbol setLineWidth

我似乎做的每件事都是正确的,因为这是我的代码:

private XYSeriesRenderer renderer = new XYSeriesRenderer();
renderer.setLineWidth(2);

这是我的导入:

import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYSeriesRenderer;

你必须在 XYMultipleSeriesRenderer 中循环所有渲染器,使用这个:

int length = renderer.getSeriesRendererCount();
        for (int i = 0; i < length; i++) {
            XYSeriesRenderer seriesRenderer = (XYSeriesRenderer) renderer
                    .getSeriesRendererAt(i);                
            seriesRenderer.setLineWidth(2);
        }