Android通过achartengine画折线图，achartengine折线图

Android通过achartengine画折线图，achartengine折线图

因为前段时间Android项目中用到了折线图的功能，在查资料的过程中发现achartengine这个包有非常强大的画图功能，正好最近有时间，就整理一下方便以后查看。

 首先要使用画图功能，就必须在lib中引入achartengine包。为了使用方便，直接使用示例中的两个文件，源码如下：

IDemoChart.java

import android.content.Context;
import android.content.Intent;

/**
 * Defines the demo charts.
 */
public interface IDemoChart {
  /** A constant for the name field in a list activity. */
  String NAME = "name";
  /** A constant for the description field in a list activity. */
  String DESC = "desc";

  /**
   * Returns the chart name.
   * 
   * @return the chart name
   */
  String getName();

  /**
   * Returns the chart description.
   * 
   * @return the chart description
   */
  String getDesc();

  /**
   * Executes the chart demo.
   * 
   * @param context the context
   * @return the built intent
   */
  Intent execute(Context context);

}

AbstractDemoChart.java

  1 import java.util.Date;
  2 import java.util.List;
  3 
  4 import org.achartengine.chart.PointStyle;
  5 import org.achartengine.model.CategorySeries;
  6 import org.achartengine.model.MultipleCategorySeries;
  7 import org.achartengine.model.TimeSeries;
  8 import org.achartengine.model.XYMultipleSeriesDataset;
  9 import org.achartengine.model.XYSeries;
 10 import org.achartengine.renderer.DefaultRenderer;
 11 import org.achartengine.renderer.SimpleSeriesRenderer;
 12 import org.achartengine.renderer.XYMultipleSeriesRenderer;
 13 import org.achartengine.renderer.XYSeriesRenderer;
 14 
 15 import android.app.Activity;
 16 
 17 /**
 18  * An abstract class for the demo charts to extend. It contains some methods for
 19  * building datasets and renderers.
 20  */
 21 public abstract class AbstractDemoChart extends Activity implements IDemoChart {
 22 
 23   /**
 24    * Builds an XY multiple dataset using the provided values.
 25    * 
 26    * @param titles the series titles
 27    * @param xValues the values for the X axis
 28    * @param yValues the values for the Y axis
 29    * @return the XY multiple dataset
 30    */
 31   protected XYMultipleSeriesDataset buildDataset(String[] titles, List<double[]> xValues,
 32       List<double[]> yValues) {
 33     XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
 34     addXYSeries(dataset, titles, xValues, yValues, 0);
 35     return dataset;
 36   }
 37 
 38   public void addXYSeries(XYMultipleSeriesDataset dataset, String[] titles, List<double[]> xValues,
 39       List<double[]> yValues, int scale) {
 40     int length = titles.length;
 41     for (int i = 0; i < length; i++) {
 42       XYSeries series = new XYSeries(titles[i], scale);
 43       double[] xV = xValues.get(i);
 44       double[] yV = yValues.get(i);
 45       int seriesLength = xV.length;
 46       for (int k = 0; k < seriesLength; k++) {
 47         series.add(xV[k], yV[k]);
 48       }
 49       dataset.addSeries(series);
 50     }
 51   }
 52 
 53   /**
 54    * Builds an XY multiple series renderer.
 55    * 
 56    * @param colors the series rendering colors
 57    * @param styles the series point styles
 58    * @return the XY multiple series renderers
 59    */
 60   protected XYMultipleSeriesRenderer buildRenderer(int[] colors, PointStyle[] styles) {
 61     XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
 62     setRenderer(renderer, colors, styles);
 63     return renderer;
 64   }
 65 
 66   protected void setRenderer(XYMultipleSeriesRenderer renderer, int[] colors, PointStyle[] styles) {
 67     renderer.setAxisTitleTextSize(16);
 68     renderer.setChartTitleTextSize(20);
 69     renderer.setLabelsTextSize(15);
 70     renderer.setLegendTextSize(15);
 71     renderer.setPointSize(5f);
 72     renderer.setMargins(new int[] { 20, 30, 15, 20 });
 73     int length = colors.length;
 74     for (int i = 0; i < length; i++) {
 75       XYSeriesRenderer r = new XYSeriesRenderer();
 76       r.setColor(colors[i]);
 77       r.setPointStyle(styles[i]);
 78       renderer.addSeriesRenderer(r);
 79     }
 80   }
 81 
 82   /**
 83    * Sets a few of the