Multiple aChartEngine Charts not scrolling

Question

I've been trying to display multiple charts in one activity. Currently, the first chart displays but the second does not (or maybe just can't be scrolled to). If I remove android:fillViewport="true" from the ScrollView then nothing displays. I modified the demo aChartEngine code to return a View instead of an intent. I don't know if the error is in XML, my custom Chart class, or my Activity. I really appreciate any help. Thanks!

XML:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<ScrollView 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true">

    <LinearLayout 
    android:id="@+id/linearParent"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:orientation="vertical">

        <LinearLayout
        android:id="@+id/chartOne"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"/>
        <LinearLayout
        android:id="@+id/chartTwo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"/>

    </LinearLayout>
</ScrollView>

Activity:

    //setup Views
    myWindow = (LinearLayout)findViewById(R.id.paidLayoutLinearParent);
    row1 = (LinearLayout) findViewById(R.id.paidLayoutChartOne);
    row2 = (LinearLayout) findViewById(R.id.paidLayoutChartTwo);

    //Pie Charts
    pie = new PieChartView(this,dens);
    pieTotalCases = pie.getPieChart("Cases", gameStatsDb.getNumCasesPassed(), gameStatsDb.getNumCasesFailed());
    pieTotalCombos = pie.getPieChart("Combos", gameStatsDb.getNumCombosPassed(), gameStatsDb.getNumCombosFailed());

    //add charts to layout
    row1.addView(pieTotalCases,new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
    row2.addView(pieTotalCombos,new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));

Custom PieChartView

public class PieChartView{
/** Colors to be used for the pie slices. */
  private static int[] COLORS = new int[] { Color.GREEN, Color.RED,Color.BLACK,Color.LTGRAY };
  private CategorySeries mSeries;
  private DefaultRenderer mRenderer;
  private Context myContext;
  float screenDens;

  public PieChartView(Context ctx,float screenDensity){
    myContext=ctx;
    screenDens=screenDensity;
  }

  public GraphicalView getPieChart(String title,int numPassed,int numFailed){
      mSeries = new CategorySeries("");
      mRenderer = new DefaultRenderer();
      stylizeChart();

      GraphicalView mChartView = ChartFactory.getPieChartView(myContext, mSeries, mRenderer);
      mRenderer.setChartTitle(title);
      if(numPassed==0 & numFailed==0){
          mSeries.add("None ",1);
          SimpleSeriesRenderer renderer = new SimpleSeriesRenderer();
          renderer.setColor(COLORS[3]);
          mRenderer.addSeriesRenderer(renderer);
          mRenderer.setDisplayValues(false);
          mRenderer.setStartAngle(90);
      }else{
          mSeries.add("Passed ",numPassed);
          SimpleSeriesRenderer renderer = new SimpleSeriesRenderer();
          renderer.setColor(COLORS[0]);
          mRenderer.addSeriesRenderer(renderer);

          mSeries.add("Failed ", numFailed);
          SimpleSeriesRenderer renderer2 = new SimpleSeriesRenderer();
          renderer2.setColor(COLORS[1]);
          mRenderer.addSeriesRenderer(renderer2);
      }
          return mChartView;
  }

  private void stylizeChart(){
    //stylize chart
        mRenderer.setZoomButtonsVisible(false);
        mRenderer.setStartAngle(180);
        mRenderer.setDisplayValues(true);
        mRenderer.setClickEnabled(false);

        mRenderer.setChartTitleTextSize(22*screenDens);
        mRenderer.setLabelsTextSize(17*screenDens);
        mRenderer.setLabelsColor(COLORS[2]);
        mRenderer.setShowLegend(false);

        mRenderer.setPanEnabled(false);
        mRenderer.setZoomEnabled(false);
        mRenderer.setZoomRate(6.0f);
        mRenderer.setInScroll(true);
  }

}

Answer 1

TRy this xml (give some height to graph containers)

<LinearLayout
    android:id="@+id/linearParent"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/graphHolder"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:background="#a11111"
        android:orientation="vertical" />

    <LinearLayout
        android:id="@+id/graphHolder2"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:background="#ea1111"
        android:orientation="vertical" />
</LinearLayout>