Android下Achartengine绘制折线图

因开发需要，App中需要用到图表的绘制，参考了网上的文章和Project Hosting on Google Code（项目地址为： https://code.google.com/p/achartengine/），写了一个简单的折线图的Demo.
下载下项目下的achartengine-1.0.0-demo-source.zip用于参考.
1.新建一个AbstractDemoChart抽象类和IDemoChart接口，在项目Demo中可以找到.
2.创建自己的图表显示类CustomerChart，主要功能是显示本周或者本月需要显示的信息，代码如下：
public class CustomerChart extends AbstractDemoChart {private List<MonitorChartData> monitor_datas;private int chart_for;private int mode;private int year;private int month;private int day;public CustomerChart(){}public CustomerChart(List<MonitorChartData> datas,int charfor,int mode,int y,int m,int d) {this.monitor_datas = datas;this.chart_for = charfor;this.mode = mode;this.year = y;this.month = m;this.day = d;}@Overridepublic String getName() {return null;}@Overridepublic String getDesc() {return null;}@Overridepublic Intent execute(Context context) {// 如果未选择日期则默认以当前日期为准if (this.mode == ChartUtil.MODE_MONTH || this.year == 0 || this.month == 0) {Calendar cal = Calendar.getInstance();setYear(cal.get(Calendar.YEAR));setMonth(cal.get(Calendar.MONTH)+1);setDay(cal.get(Calendar.DAY_OF_MONTH));}String[] titles = new String[] { "平均值" }; // 设置坐标系下方说明两天线的注释int[] colors = new int[] { Color.YELLOW }; // 设置两条线的颜色PointStyle[] styles = new PointStyle[] { PointStyle.DIAMOND }; // 设置线上的点的样式XYMultipleSeriesRenderer renderer = buildRenderer(colors, styles); // 根据颜色和样式初始化坐标系渲染List<double[]> values_y = new ArrayList<double[]>(); // y轴数据集List<double[]> values_x = new ArrayList<double[]>(); // x轴数据集String chart_title = ""; // 图表标题和y轴标题renderer.setXLabels(0);renderer.setYLabels(10);renderer.setShowGrid(true); // 设置显示刻度renderer.setXLabelsAlign(Align.RIGHT); // 设置x轴刻度的数值显示在x轴的下方renderer.setYLabelsAlign(Align.RIGHT); // 设置y轴刻度的数值显示在y轴的左方renderer.setZoomButtonsVisible(true); // 设置可以缩放renderer.setBackgroundColor(Color.GRAY);setColors(renderer, Color.WHITE, Color.WHITE);// 根据按月和按周的方式设置坐标系x轴上的labelif (this.mode == ChartUtil.MODE_WEEK) {Log.e("CustomerChart", "MODE_WEEK");// 在x轴上显示中文的labelfor (int i = 0; i < ChartUtil.WEEK_DAY.length; i++) {renderer.addXTextLabel(i + 1, ChartUtil.WEEK_DAY[i]);}// 设置X轴显示范围setXLimits(renderer, 0, 7.5);} else if (this.mode == ChartUtil.MODE_MONTH) {Log.e("CustomerChart", "MODE_MONTH");int dat_count = ChartDateUtil.getMonthDaysCount(this.year, this.month); // 根据计算出来的天数规定数据集的长度// 在x轴上显示表示天数的标识for (int k = 1; k <= dat_count; k++) {renderer.addXTextLabel(k, "" + k);}// 设置天数的显示范围setXLimits(renderer, 0, dat_count + 1);}double avg_y[] = new double[monitor_datas.size()];double avg_x[] = new double[monitor_datas.size()];// 根据数据类型设置图表不同的渲染方式switch (this.chart_for) {// 空气温度case ChartUtil.ENV_TEMPERATURE:// 设置标题和y轴标题（常量）chart_title = ChartUtil.ENV_TEMPERATURE_TITLE;// 设置缩放范围renderer.setPanLimits(ChartUtil.TEMPERATURE_LIMITES);renderer.setZoomLimits(ChartUtil.TEMPERATURE_LIMITES);// 根据周或者月模式取得的天数加载平均温度数据集for (int i = 0; i < monitor_datas.size(); i++) {avg_y[i] = this.monitor_datas.get(i).getEnv_temperature();avg_x[i] = this.monitor_datas.get(i).getDate_info();}setXYTitles(renderer, chart_title, chart_title); // 设置表格的标题，y轴标题setYLimits(renderer, -10, 45); // 设置y轴显示初始值范围break;// 空气湿度case ChartUtil.ENV_HUMIDITY:chart_title = ChartUtil.ENV_HUMIDITY_TITLE;renderer.setPanLimits(ChartUtil.HUMIDITY_LIMITES);renderer.setZoomLimits(ChartUtil.HUMIDITY_LIMITES);for (int i = 0; i < monitor_datas.size(); i++) {avg_y[i] = this.monitor_datas.get(i).getEnv_humidity();avg_x[i] = this.monitor_datas.get(i).getDate_info();}setXYTitles(renderer, chart_title, chart_title);setYLimits(renderer, -10, 45);break;// 土壤温度case ChartUtil.SOIL_TEMPERATURE:chart_title = ChartUtil.SOIL_TEMPERATURE_TITLE;renderer.setZoomLimits(ChartUtil.HUMIDITY_LIMITES);renderer.setPanLimits(ChartUtil.TEMPERATURE_LIMITES);for (int i = 0; i < monitor_datas.size(); i++) {avg_y[i] = this.monitor_datas.get(i).getSoil_temperature();avg_x[i] = this.monitor_datas.get(i).getDate_info();}setXYTitles(renderer, chart_title, chart_title);setYLimits(renderer, -10, 45);break;// 土壤湿度case ChartUtil.SOIL_HUMIDITY:chart_title = ChartUtil.SOIL_HUMIDITY_TITLE;renderer.setPanLimits(ChartUtil.HUMIDITY_LIMITES);for (int i = 0; i < monitor_datas.size(); i++) {avg_y[i] = this.monitor_datas.get(i).getSoil_humidity();avg_x[i] = this.monitor_datas.get(i).getDate_info();}setXYTitles(renderer, chart_title, chart_title);break;// 光照强度case ChartUtil.ILLUMINATION:chart_title = ChartUtil.ILLUMINATION_TITLE;renderer.setPanLimits(ChartUtil.ILLUMINATION_LIMITES);for (int i = 0; i < monitor_datas.size(); i++) {avg_y[i] = this.monitor_datas.get(i).getIntensity_of_illumination();avg_x[i] = this.monitor_datas.get(i).getDate_info();}setXYTitles(renderer, chart_title, chart_title);break;// 二氧化碳浓度case ChartUtil.CO2:chart_title = ChartUtil.CO2_TITLE;renderer.setPanLimits(ChartUtil.CO2_LIMITES);for (int i = 0; i < monitor_datas.size(); i++) {avg_y[i] = this.monitor_datas.get(i).getConcentration_of_CO2();avg_x[i] = this.monitor_datas.get(i).getDate_info();}setXYTitles(renderer, chart_title, chart_title);break;default:break;}values_y.add(avg_y);values_x.add(avg_x);StringBuffer actTitle = new StringBuffer();actTitle.append(chart_title);DateRange dateRange = getBeginDate(year, month, day);actTitle.append(" ( "+dateRange.beginDate+" 到 "+dateRange.endDate+" ) ");Intent intent = ChartFactory.getLineChartIntent(context, buildDataset(titles, values_x, values_y), renderer,actTitle.toString());return intent;}/** * 设置X轴显示范围 *  * @param renderer * @param xMin * @param xMax */private void setXLimits(XYMultipleSeriesRenderer renderer, double xMin,double xMax) {renderer.setXAxisMin(xMin);renderer.setXAxisMax(xMax);}/** * 设置Y轴显示范围 *  * @param renderer * @param yMin * @param yMax */private void setYLimits(XYMultipleSeriesRenderer renderer, double yMin,double yMax) {renderer.setYAxisMin(yMin);renderer.setYAxisMax(yMax);}/** * 设置标题 *  * @param renderer * @param title * @param yTitle */private void setXYTitles(XYMultipleSeriesRenderer renderer, String title,String yTitle) {renderer.setChartTitle(" ");renderer.setXTitle(" ");renderer.setYTitle(yTitle);}private void setColors(XYMultipleSeriesRenderer renderer, int axesColor,int labelsColor) {renderer.setAxesColor(axesColor);renderer.setLabelsColor(labelsColor);}@SuppressLint("SimpleDateFormat")private DateRange getBeginDate(int y,int m,int d){String begin = "";String end = "";DateFormat df = new SimpleDateFormat("yyyy-MM-dd");if (ChartUtil.MODE_MONTH == mode) {List<Date> temp = ChartDateUtil.getMonthByYM(y, m);begin = df.format(temp.get(0));end = df.format(temp.get(1));return new DateRange(begin, end);} else if (ChartUtil.MODE_WEEK == mode) {List<Date> temp2 = ChartDateUtil.getWeekByDate(y, m, d);begin = df.format(temp2.get(0));end = df.format(temp2.get(1));return new DateRange(begin, end);} else {return null;}}private class DateRange {public String beginDate;public String endDate;public DateRange(String begin, String end) {this.beginDate = begin;this.endDate = end;}}public List<MonitorChartData> getMonitor_datas() {return monitor_datas;}public void setMonitor_datas(List<MonitorChartData> monitor_datas) {this.monitor_datas = monitor_datas;}public int getChart_for() {return chart_for;}public void setChart_for(int chart_for) {this.chart_for = chart_for;}public int getMode() {return mode;}public void setMode(int mode) {this.mode = mode;}public int getYear() {return year;}public void setYear(int year) {this.year = year;}public int getMonth() {return month;}public void setMonth(int month) {this.month = month;}public int getDay() {return day;}public void setDay(int day) {this.day = day;}}
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