java - 在布局中加载图形图表

我尝试使用AChartEngine在布局中加载图形，即数学图形。我从网站上下载了一个演示zip文件，我意识到我需要像sin-cosin grahp风格的东西。因此，这是我编写的代码：

    package com.myproject;
    import org.achartengine.ChartFactory;
    import org.achartengine.GraphicalView;
    import org.achartengine.chart.PointStyle;
    import org.achartengine.model.XYMultipleSeriesDataset;
    import org.achartengine.renderer.XYMultipleSeriesRenderer;
    import android.os.Bundle;
    import android.app.Activity;
    import android.content.Intent;
    import android.graphics.Color;
    import android.view.View;
    import android.webkit.WebView;
    import android.widget.LinearLayout;
    import android.widget.LinearLayout.LayoutParams;
    import com.myproject.clases.AbstractDemoChart;

    public class MainActivity extends Activity {

private WebView ventana;
private GraphicalView mChartView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    XYMultipleSeriesDataset mDataset = null;//this line causes runtime error but I will see this issue later.
            int [] colors = new int[] { Color.BLUE, Color.CYAN };
        PointStyle[] styles = new PointStyle[] { PointStyle.POINT, PointStyle.POINT };
        XYMultipleSeriesRenderer mRenderer = buildRenderer(colors, styles);
    LinearLayout layout = (LinearLayout) findViewById(R.id.chart);
    mChartView = ChartFactory.getLineChartView(this, mDataset, mRenderer);
    layout.addView(mChartView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
}
}

但是线

    XYMultipleSeriesRenderer mRenderer = buildRenderer(colors, styles);

由于方法buildRenderer（）属于AbstractDemoChart类而导致编译错误。如何从另一个类中采用一种方法以在另一个类中使用？这可能是我所知道的对象编程的一个基本问题，但是我想在这里询问是否也可以在布局中加载grahp图。我正在Eclipse中工作。谢谢

最佳答案

buildRenderer是AbstractDemoChart中的一种受保护方法。但是在AChartExampleActivity样本中，buildRenderer是执行此操作的私有方法：

private XYMultipleSeriesRenderer buildRenderer(int[] colors,PointStyle[] styles)
    {
        XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
        setRenderer(renderer, colors, styles);
        return renderer;
    }

您看到GeneratedChartDemo代码了吗？它以这种方式创建渲染器：

private XYMultipleSeriesRenderer getDemoRenderer() {

    XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
    renderer.setAxisTitleTextSize(16);
    renderer.setChartTitleTextSize(20);
    renderer.setLabelsTextSize(15);
    renderer.setLegendTextSize(15);
    renderer.setPointSize(5f);
    renderer.setMargins(new int[] {20, 30, 15, 0});
    ...

我认为您应该更改初始化XYMultipleSeriesRenderer的方式。