如何在android中绘制条形图？

Question

我已经使用achartengine创建了条形图，但是图中绘制的值是静态的。现在，我已经使用sqlite创建了一个数据库，我想使用数据库中的值绘制条形图，并每1分钟刷新一次，以便绘制新值（如果有）。我在下面发布我的代码。请指导我如何修改代码，以便我可以执行以上操作。我在网上尝试了许多教程，但并没有太大帮助。

package flu.solutions.travelsense;


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

import org.achartengine.ChartFactory;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.model.CategorySeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer.Orientation;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;  
import android.view.Menu;
public class ChartActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent intent = createIntent();
        startActivity(intent);

    }

    public Intent createIntent() 

     {

    String[] titles = new String[] { "Top 10 Destinations", " " };
    List<double[]> values = new ArrayList<double[]>();
    values.add(new double[] { 8, 6, 7, 6, 7, 7, 9, 5, 7, 8, 8 });
    values.add(new double[] {});

    int[] colors = new int[] { Color.RED, Color.BLACK};

    XYMultipleSeriesRenderer renderer = buildBarRenderer(colors);
    renderer.setOrientation(Orientation.HORIZONTAL);

    setChartSettings(renderer, "Top 10 Destinations", " ", " ", 0,10, 0,10, Color.GRAY, Color.GREEN);

    renderer.setXLabels(1);
    renderer.setYLabels(10);

    renderer.addXTextLabel(1, "Bangalore");
    renderer.addXTextLabel(2, "Mysore");
    renderer.addXTextLabel(3, "Chennai");
    renderer.addXTextLabel(4, "Delhi");
    renderer.addXTextLabel(5, "Kolkatta");
    renderer.addXTextLabel(6, "Kashmir");
    renderer.addXTextLabel(7, "Hyderabad");
    renderer.addXTextLabel(8, "Mumbai");
    renderer.addXTextLabel(9, "Kerala");
    renderer.addXTextLabel(10, "Gujarat");

    int length = renderer.getSeriesRendererCount();
    for (int i = 0; i < length; i++) 
    {
      SimpleSeriesRenderer seriesRenderer = renderer.getSeriesRendererAt(i);
      seriesRenderer.setDisplayChartValues(false);
      }

    return ChartFactory.getBarChartIntent(this, buildBarDataset(titles, values), renderer,Type.DEFAULT);
    }

    protected XYMultipleSeriesRenderer buildBarRenderer(int[] colors) 
    {

    // creates a SeriesRenderer and initializes it with useful default values as well as colors

        XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();

        renderer.setAxisTitleTextSize(26);

        renderer.setChartTitleTextSize(20);

        renderer.setLabelsTextSize(15);

        renderer.setLegendTextSize(25);

        int length = colors.length;

        for (int i = 0; i < length; i++) 
        {
          SimpleSeriesRenderer r = new SimpleSeriesRenderer();
          r.setColor(colors[i]);
          //r.setChartvalueAngle(-90);
          r.setChartValuesSpacing(15);
          renderer.addSeriesRenderer(r);
        }
        return renderer;
      }

       protected void setChartSettings(XYMultipleSeriesRenderer renderer, String title, String xTitle,
       String yTitle, double xMin, double xMax, double yMin, double yMax, int axesColor,int labelsColor) 
      {

      // sets lots of default values for this renderer

       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);

       renderer.setApplyBackgroundColor(true);
       renderer.setBackgroundColor(Color.WHITE);

       renderer.setBarSpacing(1);

    }

    protected XYMultipleSeriesDataset buildBarDataset(String[] titles, List<double[]> values) 
    {

        // adds the axis titles and values into the dataset

        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;
        }

    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_chart, menu);
        return true;
    }
      }

Answer 1

您可以使用以下代码：achartengine，AndroidPlot或Charts4j。如果您想以编程方式进行操作，则可以使用以下程序：