使用數據庫的條形圖

我是新來的android。我正在使用achartengine創建條形圖。我無法繪製條形圖。你能告訴我我在這裏做錯了什麼。我已經使用sqlite數據瀏覽器創建了一個數據庫，並將數據庫複製到我的項目的assets文件夾中。使用數據庫的條形圖

我已經寫了一個代碼來繪製帶有靜態值的條形圖，現在我修改它以從數據庫中獲取值。

package flu.solutions.travelsense; 


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

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); 

     XYMultipleSeriesRenderer renderer = getBarDemoRenderer(); 
     setChartSettings(renderer); 
     Intent intent = ChartFactory.getBarChartIntent(this, getBarDemoDataset(), renderer, Type.DEFAULT); 
     startActivity(intent); 
    } 

    public Intent createIntent() 

    { 

    String[] titles = new String[] { "Top 10 Destinations", " " }; 
    List<double[]> values = new ArrayList<double[]>(); 
    values.add(new double[] { 8, 6, 4, 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); 

    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); 
    } 

    public XYMultipleSeriesRenderer getBarDemoRenderer() { 
     XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer(); 
     renderer.setAxisTitleTextSize(16); 
     renderer.setChartTitleTextSize(20); 
     renderer.setLabelsTextSize(15); 
     renderer.setLegendTextSize(15); 
     renderer.setMargins(new int[] {20, 30, 15, 0}); 
     SimpleSeriesRenderer r = new SimpleSeriesRenderer(); 
     r.setColor(Color.BLUE); 
     renderer.addSeriesRenderer(r); 
     r = new SimpleSeriesRenderer(); 
     r.setColor(Color.GREEN); 
     renderer.addSeriesRenderer(r); 
     return renderer; 
     } 

    private XYMultipleSeriesDataset getBarDemoDataset() { 
     XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset(); 
     final int nr = 10; 
     Random r = new Random(); 
     int SERIES_NR = 2; 
     for (int i = 0; i < SERIES_NR; i++) { 
      CategorySeries series = new CategorySeries("Demo series " + (i + 1)); 
      for (int k = 0; k < nr; k++) { 
      series.add(100 + r.nextInt() % 100); 
      } 
      dataset.addSeries(series.toXYSeries()); 
     } 
     return dataset; 
     } 



    private void setChartSettings(XYMultipleSeriesRenderer renderer) { 
     renderer.setChartTitle("Chart demo"); 
     renderer.setXTitle("x values"); 
     renderer.setYTitle("y values"); 
     renderer.setXAxisMin(0); 
     renderer.setXAxisMax(5); 
     renderer.setYAxisMin(0); 
     renderer.setYAxisMax(250); 
     } 
    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; 
    } 
     }

來源

2012-12-11 user1844638

您的createIntent()方法甚至不像它被引用。我認爲，正確的OnCreate是：

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

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

}

但是你應該知道，你最終要想讓你的圖形負荷視圖，而不是意圖得到你想要的實時功能。

來源

2012-12-11 09:37:42 mango

使用數據庫的條形圖

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