的Android aChartEngine条形图不工作

protected void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 
     setContentView(R.layout.nextstatschart); 

     myDataset = new XYMultipleSeriesDataset(); 

     statsRenderer = new DefaultRenderer(); 


     myRenderer.setLabelsColor(Color.BLUE); 
     myRenderer.setLabelsTextSize(12); 
     myRenderer.setAxesColor(Color.BLACK); 
     myRenderer.setBackgroundColor(Color.WHITE); 
     myRenderer.setAntialiasing(true); 
     myRenderer.setShowLabels(true); 
     myRenderer.setShowGrid(true); 
     myRenderer.setChartTitle("Next Three Months Statistical Analysis"); 
     myRenderer.setChartTitleTextSize(16); 
     myRenderer.setZoomEnabled(true); 

     myRenderer.setChartTitle(heading); 
     myRenderer.setLabelsColor(Color.BLACK); 
     myRenderer.setXAxisMin(0); 
     myRenderer.setXAxisMax(100); 
     myRenderer.setYAxisMin(0); 
     myRenderer.setYAxisMax(100); 
     myRenderer.setYLabelsAlign(Align.RIGHT); 
     myRenderer.setXTitle ("Case Type"); 
     myRenderer.setYTitle ("Count"); 
     myRenderer.setMargins(new int[] { 30, 40, 10, 40 }); 




     Bundle b = getIntent().getExtras(); 
     typ = b.getStringArray("typ"); 
     nums = b.getStringArray("counts"); 
     percentages = b.getDoubleArray("percs"); 
     stat_count = b.getInt("stat_count"); 
     X_Axis = b.getDoubleArray("typp"); 
     Y_Axis = b.getDoubleArray("contt"); 


     } 

    @Override 
    protected void onResume() { 

     super.onResume(); 

     try { 

     refreshChart(); 

     if (statsChartView == null) { 
      LinearLayout layout = (LinearLayout) findViewById(R.id.statschart); 
//   statsChartView = ChartFactory.getPieChartView(getApplicationContext(), statsSeries, statsRenderer); 
//   statsChartView = ChartFactory.getLineChartView(getApplicationContext(), xyDataset, xyRender); 
//   statsChartView = ChartFactory.getBarChartView(context, dataset, renderer, type) 

      statsChartView = ChartFactory.getBarChartView(getApplicationContext(), myDataset, myRenderer,Type.DEFAULT); 
      layout.addView(statsChartView, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 
      layout.addView(statsChartView); 
      statsChartView.refreshDrawableState(); 

      statsChartView.setBackgroundColor(Color.WHITE); 


     } else { 
      statsChartView.repaint(); 
     } 
    // refreshChart(); 
    }catch(Exception e){ 
     e.printStackTrace(); 
    } 
} 

    void refreshChart() { 

     try { 

      mySeries = new XYSeries (series); 



       int[] colorpool = new int[] { 0xff000099, 0xff009900, 0xffff0000, 
         0xffffff00, 0xff990099, 0xffff9900, 0xff996600, 0xffcccccc, 
         0xff990000, 0xff66cccc, 0xff99ccff, 0xffccffcc }; 
       int[] colors = new int[stat_count]; 

      DecimalFormat Currency = new DecimalFormat("#0.00"); 

       for (int i = 0; i < stat_count; i++) { 

        mySeries.add(Double.parseDouble(typ[i]),Double.parseDouble(nums[i])); 

        if (i > 11) { 
         colors[i] = 0xff333333; 
        } else { 
         colors[i] = colorpool[i]; 
        } 

       } 
       myDataset.addSeries (mySeries); 

       for (int color : colors) { 
        SimpleSeriesRenderer r = new SimpleSeriesRenderer(); 
        r.setColor(color); 
//     statsRenderer.addSeriesRenderer(r); 
        xyRender.addSeriesRenderer(r); 

       } 



       mySeriesRenderer = new XYSeriesRenderer(); 

       if (series.equals("Weight")) { 
        mySeriesRenderer.setColor (0xff009900); 
        mySeriesRenderer.setPointStyle(PointStyle.POINT); 
       } else { 
        mySeriesRenderer.setColor (0xff990099); 
       } 


       myRenderer.addSeriesRenderer (mySeriesRenderer); 
       int length = myRenderer.getSeriesRendererCount(); 
       for (int i = 0; i < length; i++) { 
        ((XYSeriesRenderer) myRenderer.getSeriesRendererAt(i)).setFillPoints(true); 
       } 



       // Draw the chart 
       statsChartView.repaint(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
       //Exception Code 
      } 

    }   
}

E/AndroidRuntime(910): FATAL EXCEPTION: main 
E/AndroidRuntime(910): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.courts.action/com.courts.action.NextStatsChart}: java.lang.NullPointerException

来源

2012-12-06 SahanS

在该行确实在发生的NullPointerException？在那一行，一些对象没有被初始化。 – Demonick

请不要只转储所有的代码，并包含来自logcat的堆栈跟踪。 – Simon

这可能是因为这样，

<activity android:name="com.courts.action.NextStatsChart" android:label="@string/app_name" />

来源

2012-12-06 08:03:49 Talha

的Android aChartEngine条形图不工作

回答

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