XYLineChartView.java

package com.examples;

import net.droidsolutions.droidcharts.awt.Rectangle2D;
import net.droidsolutions.droidcharts.core.ChartFactory;
import net.droidsolutions.droidcharts.core.JFreeChart;
import net.droidsolutions.droidcharts.core.axis.NumberAxis;
import net.droidsolutions.droidcharts.core.data.XYDataset;
import net.droidsolutions.droidcharts.core.plot.PlotOrientation;
import net.droidsolutions.droidcharts.core.plot.XYPlot;
import net.droidsolutions.droidcharts.core.renderer.xy.XYLineAndShapeRenderer;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.View;

public class XYLineChartView extends View {

		private final String mChartTitle;
		private final String mXLabel;
		private final String mYLabel;
		private final XYDataset mDataSet;

		/** The view bounds. */
		private final Rect mRect = new Rect();

		/**
		 * Creates a new graphical view.
		 * 
		 * @param context
		 *          the context
		 * @param chart
		 *          the chart to be drawn
		 */
		public XYLineChartView(Context context, String chartTitle, String xLabel, String yLabel, XYDataset dataSet) {
				super(context);
				mChartTitle = chartTitle;
				mXLabel = xLabel;
				mYLabel = yLabel;
				mDataSet = dataSet;
		}
		
		public XYLineChartView(Context context) {
			this(context, "A Title", "An X label", "A Y Label", null);
		}

		@Override
		protected void onDraw(Canvas canvas) {

				super.onDraw(canvas);
				canvas.getClipBounds(mRect);

				// Get the passed in data set
				final XYDataset dataset = mDataSet;

				// Create the Chart
				final JFreeChart chart = createChart(dataset);

				// Draw it
				chart.draw(canvas, new Rectangle2D.Double(0, 0, mRect.width(), mRect.height()));
		}

		/**
		 * Creates a chart.
		 * 
		 * @param dataset
		 *          the data for the chart.
		 * 
		 * @return a chart.
		 */
		private JFreeChart createChart(final XYDataset dataset) {
				// create the chart...
				// (chart title, x-axis label, y-axis label,
				// dataset,orientation,orientation ,url)

				final JFreeChart chart = ChartFactory.createXYLineChart(mChartTitle, mXLabel, mYLabel, dataset, PlotOrientation.VERTICAL, true, true, false);

				Paint white = new Paint(Paint.ANTI_ALIAS_FLAG);
				white.setColor(Color.WHITE);

				Paint dkGray = new Paint(Paint.ANTI_ALIAS_FLAG);
				dkGray.setColor(Color.DKGRAY);

				Paint lightGray = new Paint(Paint.ANTI_ALIAS_FLAG);
				lightGray.setColor(Color.LTGRAY);
				lightGray.setStrokeWidth(10);

				// Set Chart Background color
				chart.setBackgroundPaint(white);

				final XYPlot plot = chart.getXYPlot();

				plot.setBackgroundPaint(dkGray);
				plot.setDomainGridlinePaint(lightGray);
				plot.setRangeGridlinePaint(lightGray);

				final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
				renderer.setSeriesLinesVisible(0, true);
				plot.setRenderer(renderer);

				// change the auto tick unit selection to integer units only...
				final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
				rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
				// final NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis();
				// domainAxis.set(CategoryLabelPositions.STANDARD);

				return chart;

			}
	}