在android中顯示帶有sqlite表格數據的條形圖？

Question

我對Android很新，在我的SQLite表中有圖表，我想要在圖表中顯示X和Y軸上的數據。我的數據庫值或休耕：

productId  Qty 

2100021  20 
2100022  50 

我想在Android和X軸和Y軸上繪製這些值的圖形。

我寫入以下代碼

公共類SalesTrackingByCustomer延伸活動{

private DBAdapter db; 
private Spinner spinner1, spinner2; 
private String[] prodctnames; 
private String[] prodctnames1; 
private double[] product_1; 
private double[] product_2; 
public int count; 
public String custid; 
public Sample customerdetails; 
public ChartCollection<String> collection; 
ChartArea area; 
ChartArea area1; 

private SimpleAdapter mSchedule; 
Vector<String> vec_custid=new Vector<String>(); 
Vector<String> vec_oldno=new Vector<String>(); 
Vector<String> vec_productid=new Vector<String>(); 
Vector<String> vec_qty=new Vector<String>(); 
private ListView mListView; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
super.onCreate(savedInstanceState); 
setContentView(R.layout.bycustomers); 
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
mListView=(ListView)findViewById(R.id.listView1); 
prodctnames=new String[10]; 
product_1=new double[10]; 

prodctnames1=new String[10]; 
product_2=new double[10]; 

db=new DBAdapter(this); 

final ChartView chartView = (ChartView) findViewById(R.id.chartView); 

ChartPalette palette = new ChartPalette(0xffffd7e8); 
chartView.setPalette(palette); 
final ChartSeries product1 = new ChartSeries("P1", ChartTypes.Column); 


spinner1 = (Spinner) findViewById(R.id.spinner1); 
spinner1.setOnItemSelectedListener(new OnItemSelectedListener() { 

    @Override 
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, 
      long arg3) { 
     // TODO Auto-generated method stub 

     int position=spinner1.getSelectedItemPosition(); 
     System.out.println("=====ITEM POSITION======"+position); 

     final String selected=arg0.getItemAtPosition(arg2).toString(); 
     System.out.println("=====IN SELECTED======"+selected); 

     db.open(); 
     Cursor customer=db.fetchorderCustomername(selected); 
     custid=customer.getString(0); 
     System.out.println("=====CUSTOMER NAME ID======"+custid); 
     Cursor cursor=db.fetchorderDetails(custid); 
     count=cursor.getCount(); 
     System.out.println("=====COUNT======"+count); 

       int i=0; 
       while (i<count) 
       { 
        String productid=cursor.getString(1); 
        prodctnames[i]=productid; 

        String qty=cursor.getString(2); 
        product_1[i]=Double.parseDouble(qty); 
        System.out.println("=====PROID======"+prodctnames[i]+"=====QUANTITY======"+product_1[i]); 
        cursor.moveToNext(); 
        i++; 

       } 


       for (int j = 0; j < count; j++) 
       { 
        ChartPoint point = product1.getPoints().addXY(j, product_1[j]); 
        point.setAxisLabel(prodctnames[j]); 
       } 

       if(position==0) 
       { 
        chartView.refreshDrawableState(); 

        chartView.getSeries().add(product1); 


        area = chartView.getAreas().get(0); 

       area.getDefaultXAxis().setLabelsMode(ChartAxis.LabelsMode.SeriesLabels); 

       } 
       if(position==1) 
       { 

        chartView.refreshDrawableState(); 


        chartView.getSeries().add(product1); 
        area1 = chartView.getAreas().get(0); 

        area1.getDefaultXAxis().setLabelsMode(ChartAxis.LabelsMode.SeriesLabels); 
       } 

       //area.refresh(); 
       db.close(); 

         } 

    @Override 
    public void onNothingSelected(AdapterView<?> arg0) { 
     // TODO Auto-generated method stub 

    } 
}); 

預先感謝。

Answer 1

您試圖添加具有相同名稱的新區域。更改區域的名稱。

參考：http://www.artfulbits.com/support/forum.aspx?g=posts&t=389