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class PointsLabelAdapter implements ChartAxis.LabelsAdapter
{
	private final ChartSeries mSeries;
	
	public PointsLabelAdapter(ChartSeries series)
	{
		mSeries = series;
	}
	
	@Override
  public void updateLabels(ChartAxis axis, List output)
  {
		ChartAxisScale scale = axis.getScale();
		output.clear();
		
		int start = (int) scale.getVisibleMinimum();
		int end = (int) scale.getVisibleMaximum();
		int step = (int) scale.getVisibleInterval();
		
		for(int p = start; p < end; p += step)
		{
			String labelText = "";
			
			if(p < mSeries.getPoints().size())
				labelText = mSeries.getPoints().get(p).getAxisLabel(); 
			
			output.add(new Label(labelText, p));
		}
  }
}

...

chartArea.getDefaultXAxis().setLabelsAdapter(new PointsLabelAdapter(chartSeries));