2012-02-13 18 views
0

私は自分のアプリケーションで折れ線グラフを使用したいと思っています。折れ線グラフの背景画像として設定している画像の下に2番目の線形レイアウトで表示したいです。 mチャートエンジンライブラリを使用しています。 66行でnullポインタ例外(layout.addView(mChartView、新しいLayoutParams(LayoutParams.FILL_PARENT、LayoutParams.FILL_PARENT));)aChartengineを使用した折れ線グラフ

package com.android.linegraph; 

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

    import org.achartengine.ChartFactory; 
    import org.achartengine.GraphicalView; 
    import org.achartengine.chart.PointStyle; 
    import org.achartengine.model.XYMultipleSeriesDataset; 
    import org.achartengine.model.XYSeries; 
    import org.achartengine.renderer.XYMultipleSeriesRenderer; 
    import org.achartengine.renderer.XYSeriesRenderer; 

    import android.app.Activity; 
    import android.graphics.Color; 
    import android.graphics.Paint.Align; 
    import android.os.Bundle; 
    import android.util.Log; 
    import android.view.ViewGroup.LayoutParams; 
    import android.widget.LinearLayout; 

    public class LineGraph extends Activity { 
     private GraphicalView mChartView; 

     XYMultipleSeriesRenderer renderer; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      // TODO Auto-generated method stub 
      super.onCreate(savedInstanceState); 

      LinearLayout layout = (LinearLayout) findViewById(R.id.linearLayout2); 

      String[] titles = new String[] { "spens1" }; 
      List<double[]> x = new ArrayList<double[]>(); 
      x.add(new double[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }); 
      // } 
      List<double[]> values = new ArrayList<double[]>(); 
      values 
        .add(new double[] { 9, 10, 11, 15, 19, 23, 26, 25, 22, 18, 13, 
          10 }); 
      int[] colors = new int[] { Color.BLUE }; 
      PointStyle[] styles = new PointStyle[] { PointStyle.CIRCLE }; 

      renderer = buildRenderer(colors, styles); 
      int length = renderer.getSeriesRendererCount(); 
      for (int i = 0; i < length; i++) { 
       ((XYSeriesRenderer) renderer.getSeriesRendererAt(i)) 
         .setFillPoints(true); 
      } 
      setChartSettings(renderer, "SCORE CARD VIEW", "Attetempts", 
        "Marks Scored", 0.5, 12.5, -10, 40, Color.LTGRAY, Color.LTGRAY); 
      renderer.setXLabels(12); 
      renderer.setYLabels(10); 
      renderer.setShowGrid(true); 
      renderer.setXLabelsAlign(Align.RIGHT); 
      renderer.setYLabelsAlign(Align.RIGHT); 
      renderer.setZoomButtonsVisible(true); 
      renderer.setPanLimits(new double[] { -10, 20, -10, 40 }); 
      renderer.setZoomLimits(new double[] { -10, 20, -10, 40 }); 

      if (mChartView == null) { 
       Log.d("Oncreate ", "if (mChartView == null)"); 
       mChartView = ChartFactory.getLineChartView(this, mDataset(titles, 
         x, values), renderer); 
       layout.addView(mChartView, new LayoutParams(
         LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 

      } else { 
    //   mChartView.repaint(); 
       Log.d("Oncreate ", "if (mChartView != null)"); 
      } 
     } 

     private void setChartSettings(XYMultipleSeriesRenderer renderer3, 
       String title, String xTitle, String yTitle, double xMin, 
       double xMax, double yMin, double yMax, int axesColor, 
       int labelsColor) { 
      // TODO Auto-generated method stub 

      renderer3.setChartTitle(title); 
      renderer3.setXTitle(xTitle); 
      renderer3.setYTitle(yTitle); 
      renderer3.setXAxisMin(xMin); 
      renderer3.setXAxisMax(xMax); 
      renderer3.setYAxisMin(yMin); 
      renderer3.setYAxisMax(yMax); 
      renderer3.setAxesColor(axesColor); 
      renderer3.setLabelsColor(labelsColor); 

     } 

     private XYMultipleSeriesRenderer buildRenderer(int[] colors, 
       PointStyle[] styles) { 
      // TODO Auto-generated method stub 
      XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer(); 
      setRenderer(renderer, colors, styles); 
      return renderer; 
     } 

     private void setRenderer(XYMultipleSeriesRenderer renderer2, int[] colors, 
       PointStyle[] styles) { 
      // TODO Auto-generated method stub 
      renderer2.setAxisTitleTextSize(16); 
      renderer2.setChartTitleTextSize(20); 
      renderer2.setLabelsTextSize(15); 
      renderer2.setLegendTextSize(15); 
      renderer2.setPointSize(5f); 
      renderer2.setMargins(new int[] { 20, 30, 15, 20 }); 
      int length = colors.length; 
      for (int i = 0; i < length; i++) { 
       XYSeriesRenderer r = new XYSeriesRenderer(); 
       r.setColor(colors[i]); 
       r.setPointStyle(styles[i]); 
       renderer2.addSeriesRenderer(r); 
      } 
     } 

     private XYMultipleSeriesDataset mDataset(String[] titles, 
       List<double[]> xValues, List<double[]> yValues) { 
      // TODO Auto-generated method stub 
      XYMultipleSeriesDataset dataset1 = new XYMultipleSeriesDataset(); 
      addXYSeries(dataset1, titles, xValues, yValues, 0); 
      return dataset1; 
     } 

     private void addXYSeries(XYMultipleSeriesDataset dataset, String[] titles, 
       List<double[]> xValues, List<double[]> yValues, int scale) { 
      // TODO Auto-generated method stub 

      int length = titles.length; 
      for (int i = 0; i < length; i++) { 
       XYSeries series = new XYSeries(titles[i], scale); 
       double[] xV = xValues.get(i); 
       double[] yV = yValues.get(i); 
       int seriesLength = xV.length; 
       for (int k = 0; k < seriesLength; k++) { 
        series.add(xV[k], yV[k]); 
       } 
       dataset.addSeries(series); 
      } 

     } 

    } 

<RelativeLayout android:id="@+id/relativeLayout1" 
    android:layout_width="fill_parent" android:layout_height="fill_parent" 
    xmlns:android="http://schemas.android.com/apk/res/android"> 
    <LinearLayout android:id="@+id/linearLayout1" 
     android:background="@drawable/cricket" android:layout_alignParentLeft="true" 
     android:layout_height="wrap_content" android:layout_width="wrap_content"></LinearLayout> 

    <LinearLayout android:id="@+id/linearLayout2" 
     android:layout_below="@id/linearLayout1" 
     android:layout_alignParentLeft="true" android:layout_height="wrap_content" 
     android:layout_width="wrap_content"></LinearLayout> 
</RelativeLayout> 

答えて

1

を助けてください、私は今、実際には、これをテストすることはできませんが、私はあなたを考えます

setContentView(R.layout.NAME_OF_YOUR_XML_FILE); 

に電話がありません。この行の後になる:このなし

super.onCreate(savedInstanceState); 

layout変数は、このように例外(私の推測)を引き起こし、nullです。

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