Java 如何将JSON与chartengine库连接

我正在使用achartEngine在我的android应用程序中绘制线条图。我正在代码中设置数据。现在我需要从JSON中获取数据并将其显示在图形中，但我不知道如何将JSON与achartengine连接并将其显示在线形图中

这是我的错误源代码：

解析json

public class ErizaChartEngine extends Activity {
List NabList = new ArrayList();
boolean statuskoneksi= true;
private ProgressDialog Dialog;
protected Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    new LineChartAsyncTask().execute();
    setContentView(R.layout.layoutchart);

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

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


        @Override
        protected String doInBackground(String... params) {
            String url= "http://www.ab.com/NabChart.htm?id=03&nilai=10";
            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);
                    System.out.println("json parser done");
                }
            }
            catch (JSONException e) {
                    e.printStackTrace();
                }
                return null;
            }

        @Override
        protected void onPostExecute(String file_url) {
            Dialog.dismiss();
}

---

我真的需要帮助来解决我的问题，因为我的代码仍然错误，我不知道如何修复它。有人能帮我解决这个问题吗？

只需初始化图表内容（数据集、渲染器）并开始解析json。将从文件中读取的每个数据项添加到数据集中的序列中。完成后，显示图表。

您能给我举个例子吗。。？我不明白你的意思，谢谢

public void drawNABContentSimpleChart
    (
     String strtanggal,
     String strNilaiNABHMin0)
    {
        XYSeries nabseries = new XYSeries("nab");

        for (int i=0;i<NabList.size();i++){
            nabseries.add(strNilaiNABHMin0[i]);
        }
        XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
        // Adding Income Series to the dataset
        dataset.addSeries(nabseries);

        XYSeriesRenderer incomeRenderer = new XYSeriesRenderer();
        incomeRenderer.setColor(Color.WHITE);
        incomeRenderer.setPointStyle(PointStyle.CIRCLE);
        incomeRenderer.setFillPoints(true);
        incomeRenderer.setLineWidth(2);
        incomeRenderer.setDisplayChartValues(true);

        XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
        multiRenderer.setXLabels(0);
        multiRenderer.setChartTitle("NAB 1 year");
        multiRenderer.setXTitle("Year 2012");
        multiRenderer.setYTitle("Nilai");
        multiRenderer.setZoomButtonsVisible(true);              
        for(int i=0;i<NabList.size();i++){
            multiRenderer.addXTextLabel(strtanggal[i]);         
        }       
        multiRenderer.addSeriesRenderer(incomeRenderer);

        // Creating an intent to plot line chart using dataset and multipleRenderer
        Intent intent = ChartFactory.getLineChartIntent(getBaseContext(), dataset, multiRenderer);

        // Start Activity
        startActivity(intent);
    }