Android实战简易教程-第十六枪（LineChart实现数据趋势展示）

标签：

aChartEngine中的line Chart是线图，是数据显示的一种。首先我们要下载aChartEngine的jar包，然后导入到工程中。

直接看一下代码（部分注释）：

package com.yayun.linechart;

import java.util.ArrayList;
import java.util.List;

import org.achartengine.ChartFactory;
import org.achartengine.chart.PointStyle;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;

import android.app.Activity;
import android.graphics.Color;
import android.graphics.Paint.Align;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		String[] titles = new String[] { "Crete", "Corfu", "Thassos",
				"Skiathos" };//四个标题，也就是四个城市
		List<double[]> x = new ArrayList<double[]>();
		for (int i = 0; i < titles.length; i++) {
			x.add(new double[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 });//X轴数值
		}
		List<double[]> values = new ArrayList<double[]>();//要显示的数值
		values.add(new double[] { 12.3, 12.5, 13.8, 16.8, 20.4, 24.4, 26.4,
				26.1, 23.6, 20.3, 17.2, 13.9 });
		values.add(new double[] { 10, 10, 12, 15, 20, 24, 26, 26, 23, 18, 14,
				11 });
		values.add(new double[] { 5, 5.3, 8, 12, 17, 22, 24.2, 24, 19, 15, 9, 6 });
		values.add(new double[] { 9, 10, 11, 15, 19, 23, 26, 25, 22, 18, 13, 10 });
		int[] colors = new int[] { Color.BLUE, Color.GREEN, Color.CYAN,
				Color.YELLOW };//四种显示颜色
		PointStyle[] styles = new PointStyle[] { PointStyle.CIRCLE,
				PointStyle.DIAMOND, PointStyle.TRIANGLE, PointStyle.SQUARE };//四种显示样式
		XYMultipleSeriesRenderer renderer = buildRenderer(colors, styles);
		int length = renderer.getSeriesRendererCount();
		for (int i = 0; i < length; i++) {
			((XYSeriesRenderer) renderer.getSeriesRendererAt(i))
					.setFillPoints(true);
		}
		setChartSettings(renderer, "Average temperature", "Month",
				"Temperature", 0.5, 12.5, -10, 40, Color.LTGRAY, Color.LTGRAY);
		renderer.setXLabels(12);
		renderer.setYLabels(10);
		renderer.setShowGrid(true);
		renderer.setXLabelsAlign(Align.RIGHT);
		renderer.setYLabelsAlign(Align.RIGHT);

		renderer.setZoomButtonsVisible(true);//缩放按钮
		renderer.setPanLimits(new double[] { -10, 20, -10, 40 });
		renderer.setZoomLimits(new double[] { -10, 20, -10, 40 });

		View view = ChartFactory.getLineChartView(this,
				buildDataset(titles, x, values), renderer);//获取view
		view.setBackgroundColor(Color.BLACK);//背景颜色
		setContentView(view);
	}

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

	private void setRenderer(XYMultipleSeriesRenderer renderer, int[] colors,
			PointStyle[] styles) {
		renderer.setAxisTitleTextSize(16);
		renderer.setChartTitleTextSize(20);
		renderer.setLabelsTextSize(15);
		renderer.setLegendTextSize(15);
		renderer.setPointSize(5f);
		renderer.setMargins(new int[] { 20, 30, 15, 20 });
		int length = colors.length;
		for (int i = 0; i < length; i++) {
			XYSeriesRenderer r = new XYSeriesRenderer();
			r.setColor(colors[i]);
			r.setPointStyle(styles[i]);
			renderer.addSeriesRenderer(r);
		}
	}

	private void setChartSettings(XYMultipleSeriesRenderer renderer,//坐标设置
			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);
	}

	private XYMultipleSeriesDataset buildDataset(String[] titles,//创建数据集
			List<double[]> xValues, List<double[]> yValues) {
		XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
		addXYSeries(dataset, titles, xValues, yValues, 0);
		return dataset;
	}

	private 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);
			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);
		}
	}
}

喜欢的朋友可以关注我，谢谢！

Android实战简易教程-第十六枪（LineChart实现数据趋势展示）

标签：

原文地址：http://blog.csdn.net/yayun0516/article/details/46482745