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;
	}

	@Override
	public String getName() {
		return null;
	}

	@Override
	public String getDesc() {
		return null;
	}

	@Override
	public 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label
		if (this.mode == ChartUtil.MODE_WEEK) {
			
			Log.e("CustomerChart", "MODE_WEEK");
			// 在x轴上显示中文的label
			for (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;
	}

}