如何使用Graphview库

使线型图我想用我从http://www.jjoe64.com/p/graphview-library.html我的问题而采取的是我想从JSON采取数据作为波纹管Graphview库做一个线型图：如何使用Graphview库

[ 
{ 
    "lji_invest": "Excellink Aggressive Fund", 
    "persen_hke1": 0, 
    "lnu_nilai": 3611.468, 
    "lji_id": "03", 
    "tanggal": "01/04/2013" 
}, 
{ 
    "lji_invest": "Excellink Aggressive Fund", 
    "persen_hke1": 0.001143302391160603, 
    "persen_hmin1": 0.001143302391160603, 
    "lnu_nilai": 3615.597, 
    "selisih": 4.129, 
    "lji_id": "03", 
    "tanggal": "02/04/2013" 
}, 
{ 
    "lji_invest": "Excellink Aggressive Fund", 
    "persen_hke1": 0.005411926673585367, 
    "persen_hmin1": 0.004263749527394784, 
    "lnu_nilai": 3631.013, 
    "selisih": 15.416, 
    "lji_id": "03", 
    "tanggal": "03/04/2013" 
}]

我想显示“lnu_nilai “和”tanggal“在线图中，我试过了，但我什么都没有。这是我的源代码：

public class LineChartAsyncTask extends AsyncTask <String, String, String>{ 

    @Override 
    protected void onPreExecute(){ 
     super.onPreExecute(); 
     Dialog=new ProgressDialog(LineChart.this); 
     Dialog.setMessage("Mohon Tunggu Sebentar..."); 
     Dialog.setIndeterminate(false); 
     Dialog.setCancelable(true); 
     Dialog.show(); 
    } 


    @Override 
    protected String doInBackground(String... params) { 
     String url= "http://www.sinarmaslife.co.id/E-Policy/ios/NabChart.htm?id=03&nilai=7"; 
     try { 
      JSONParser jp= new JSONParser(); 
      JSONArray ja= jp.takeJson(url); 

      for (int i=0; i<ja.length();i++){ 
       JSONObject jo = ja.getJSONObject(i); 
       HashMap<String, String> map = new HashMap<String, String>(); 

       if (jo.has("lnu_nilai")) 
        map.put("lnu_nilai", jo.get("lnu_nilai").toString()); 

       if (jo.has("tanggal")) 
        map.put("tanggal", jo.get("tanggal").toString()); 
       NabList.add(map); 
      } 
     } 
     catch (JSONException e) { 
       e.printStackTrace(); 
      } 
      return null; 
     } 

    @Override 
    protected void onPostExecute(String file_url) { 
     Dialog.dismiss(); 
     GraphViewSeries exampleSeries = new GraphViewSeries(new GraphViewData[NabList.size()]); 
     { 
      for (int i=0; i<NabList.size();i++){ 

       HashMap MapA= new HashMap(); 
       MapA=(HashMap) NabList.get(i); 

      } 
     } 
     GraphView graphView; 

    graphView = new LineGraphView(
      this // context 
        , "GraphViewDemo" // heading 
      ); 

     graphView.addSeries(exampleSeries); // data 

     LinearLayout layout = (LinearLayout) findViewById(R.id.graph1); 
     layout.addView(graphView); 

     }; 
    } 
}

我申请了强制关闭，和图表没有显示....我不知道哪里是我的错，我希望有人能帮助我解决这个问题，谢谢

来源

2013-04-11 Aoyama Nanami