首先看一下示例中类之间的关系:
1. ChartDemo这个类是整个应用程序的入口,运行之后的效果显示一个list.
2. IDemoChart接口,这个接口定义了三个方法,
getName()返回值是listitem上显示的标题;
getDesc()返回值是listitem上显示的描述内容.
excute(context)返回值是一个Intent,当点击listitem后跳转到此Intent.
3. AbstractDemoChart类是一个抽象类,实现接口IDemoChart接口,这个类中封装了构建DataSet和renderer的方法,目的快速构建我们的dataset和renderer.这个类具体提供了哪些方法呢?见下图.至于为什么要进行这样的封装看完4中ChartFactory.get***Intent()方法的参数类型后您就明白了.
AbstractChartDemo.java:
package org.achartengine.chartdemo.demo.chart;import java.util.Date;import java.util.List;import org.achartengine.chart.PointStyle;import org.achartengine.model.CategorySeries;import org.achartengine.model.MultipleCategorySeries;import org.achartengine.model.TimeSeries;import org.achartengine.model.XYMultipleSeriesDataset;import org.achartengine.model.XYSeries;import org.achartengine.renderer.DefaultRenderer;import org.achartengine.renderer.SimpleSeriesRenderer;import org.achartengine.renderer.XYMultipleSeriesRenderer;import org.achartengine.renderer.XYSeriesRenderer;public abstract class AbstractDemoChart implements IDemoChart { /** * 构建 XYMultipleSeriesDataset. * * @param titles 每个序列的图例 * @param xValues X轴的坐标 * @param yValues Y轴的坐标 * @return XYMultipleSeriesDataset */ protected XYMultipleSeriesDataset buildDataset(String[] titles, List<double[]> xValues, List<double[]> yValues) { XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset(); addXYSeries(dataset, titles, xValues, yValues, 0); return dataset; } //向DataSet中添加序列. public void addXYSeries(XYMultipleSeriesDataset dataset, String[] titles, List<double[]> xValues, List<double[]> yValues, int scale) { int length = titles.length; for (int i = 0; i < length; i++) { XYSeries series = new XYSeries(titles[i], scale); //这里注意与TimeSeries区别. double[] xV = xValues.get(i); double[] yV = yValues.get(i); int seriesLength = xV.length; for (int k = 0; k < seriesLength; k++) { series.add(xV[k], yV[k]); } dataset.addSeries(series); } } /** * 构建XYMultipleSeriesRenderer. * * @param colors 每个序列的颜色 * @param styles 每个序列点的类型(可设置三角,圆点,菱形,方块等多种) * @return XYMultipleSeriesRenderer */ protected XYMultipleSeriesRenderer buildRenderer(int[] colors, PointStyle[] styles) { XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer(); setRenderer(renderer, colors, styles); return renderer; } protected void setRenderer(XYMultipleSeriesRenderer renderer, int[] colors, PointStyle[] styles) { //整个图表属性设置 //-->start renderer.setAxisTitleTextSize(16);//设置轴标题文字的大小 renderer.setChartTitleTextSize(40);//设置整个图表标题文字的大小 renderer.setLabelsTextSize(15);//设置轴刻度文字的大小 renderer.setLegendTextSize(15);//设置图例文字大小 renderer.setPointSize(5f);//设置点的大小(图上显示的点的大小和图例中点的大小都会被设置) renderer.setMargins(new int[] { 20, 30, 15, 20 });//设置图表的外边框(上/左/下/右) //-->end //以下代码设置没个序列的颜色. //-->start int length = colors.length; for (int i = 0; i < length; i++) { XYSeriesRenderer r = new XYSeriesRenderer(); r.setColor(colors[i]);//设置颜色 r.setPointStyle(styles[i]); renderer.addSeriesRenderer(r); } //-->end } /** * 设置renderer的一些属性. * * @param renderer 要设置的renderer * @param title 图表标题 * @param xTitle X轴标题 * @param yTitle Y轴标题 * @param xMin X轴最小值 * @param xMax X轴最大值 * @param yMin Y轴最小值 * @param yMax Y轴最大值 * @param axesColor X轴颜色 * @param labelsColor Y轴颜色 */ protected void setChartSettings(XYMultipleSeriesRenderer renderer, String title, String xTitle, String yTitle, double xMin, double xMax, double yMin, double yMax, int axesColor, int labelsColor) { renderer.setChartTitle(title); renderer.setXTitle(xTitle); renderer.setYTitle(yTitle); renderer.setXAxisMin(xMin); renderer.setXAxisMax(xMax); renderer.setYAxisMin(yMin); renderer.setYAxisMax(yMax); renderer.setAxesColor(axesColor); renderer.setLabelsColor(labelsColor); } /** * 构建和时间有关的XYMultipleSeriesDataset,这个方法与buildDataset在参数上区别是需要List<Date[]>作参数. * * @param titles 序列图例 * @param xValues X轴值 * @param yValues Y轴值 * @return XYMultipleSeriesDataset */ protected XYMultipleSeriesDataset buildDateDataset(String[] titles, List<Date[]> xValues, List<double[]> yValues) { XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset(); int length = titles.length; for (int i = 0; i < length; i++) { TimeSeries series = new TimeSeries(titles[i]);//构建时间序列TimeSeries, Date[] xV = xValues.get(i); double[] yV = yValues.get(i); int seriesLength = xV.length; for (int k = 0; k < seriesLength; k++) { series.add(xV[k], yV[k]); } dataset.addSeries(series); } return dataset; } /** * 构建单个CategorySeries,可用于生成饼图,注意与buildMultipleCategoryDataset(构建圆环图)相区别. * * @param titles the series titles * @param values the values * @return the category series */ protected CategorySeries buildCategoryDataset(String title, double[] values) { CategorySeries series = new CategorySeries(title); int k = 0; for (double value : values) { series.add("Project " + ++k, value); } return series; } /** * 构建MultipleCategorySeries,可用于构建圆环图(每个环是一个序列) * * @param titles the series titles * @param values the values * @return the category series */ protected MultipleCategorySeries buildMultipleCategoryDataset(String title, List<String[]> titles, List<double[]> values) { MultipleCategorySeries series = new MultipleCategorySeries(title); int k = 0; for (double[] value : values) { series.add(2007 + k + "", titles.get(k), value); k++; } return series; } /** * 构建DefaultRenderer. * * @param colors 每个序列的颜色 * @return DefaultRenderer */ protected DefaultRenderer buildCategoryRenderer(int[] colors) { DefaultRenderer renderer = new DefaultRenderer(); renderer.setLabelsTextSize(15); renderer.setLegendTextSize(15); renderer.setMargins(new int[] { 20, 30, 15, 0 }); for (int color : colors) { SimpleSeriesRenderer r = new SimpleSeriesRenderer(); r.setColor(color); renderer.addSeriesRenderer(r); } return renderer; } /** * 构建XYMultipleSeriesDataset,适用于柱状图. * * @param titles 每中柱子序列的图列 * @param values 柱子的高度值 * @return XYMultipleSeriesDataset */ protected XYMultipleSeriesDataset buildBarDataset(String[] titles, List<double[]> values) { XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset(); int length = titles.length; for (int i = 0; i < length; i++) { CategorySeries series = new CategorySeries(titles[i]); double[] v = values.get(i); int seriesLength = v.length; for (int k = 0; k < seriesLength; k++) { series.add(v[k]); } dataset.addSeries(series.toXYSeries()); } return dataset; } /** * 构建XYMultipleSeriesRenderer,适用于柱状图. * * @param colors 每个序列的颜色 * @return XYMultipleSeriesRenderer */ protected XYMultipleSeriesRenderer buildBarRenderer(int[] colors) { XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer(); renderer.setAxisTitleTextSize(16); renderer.setChartTitleTextSize(20); renderer.setLabelsTextSize(15); renderer.setLegendTextSize(15); int length = colors.length; for (int i = 0; i < length; i++) { SimpleSeriesRenderer r = new SimpleSeriesRenderer(); r.setColor(colors[i]); renderer.addSeriesRenderer(r); } return renderer; }}4. 其他的以*Chat结尾的类大都继承自AbstractDemoChart这个类实现了接口IDemoChart.我们可以重点看一下execute(context)方法,分析之后发现这个方法中构建Intent的步骤大同小异,第一步构建dataset,第二步构建renderer,第三步调用ChartFactory.get***Intent()方法或ChartFactory.get***View()方法,二者的区别在于一个返回Intent,这个intent可以启动一个特定的activity,另一个返回GraphicalView,对这个GraphicalView可以灵活设置也可以仅作为一部分显示在任何activity上.对于ChartFactory.get***Intent()上的参数activityTitle是指设置显示在activity上的标题.
