ChartExample.java

package com.example.testchart;

import java.util.*;
import java.io.*;
import java.text.DateFormat;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.*;
import android.widget.*;
import android.content.*;
import android.content.res.AssetManager;
import android.graphics.Color;
import android.graphics.Paint.Align;

import org.achartengine.*;
import org.achartengine.chart.*;
import org.achartengine.model.*;
import org.achartengine.renderer.*;
import org.achartengine.tools.*;
import org.json.*;

public class ChartExample extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LinearLayout ll  = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);
        final TimeChart lc = new TimeChart(getDataset(), getRenderer());
        final GraphicalView graph = new GraphicalView(getApplicationContext(),lc);
        ll.addView(graph);
        lc.setXAxisSmart(true);
        lc.setDateFormat("yy-MM-dd");
        setContentView(ll);
    }

    void log(String msg) {
    	Log.d("graph",msg);
    }

    public void onClickMe(View v) {
    	Intent chart = ChartFactory.getLineChartIntent(getApplicationContext(), getDataset(), getRenderer());
    	startActivity(chart);
    }

	private XYMultipleSeriesRenderer getRenderer() {
		XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
		renderer.setApplyBackgroundColor(true);
		renderer.setBackgroundColor(Color.BLACK);
		renderer.setXLabelsColor(Color.YELLOW);
		renderer.setShowGrid(true);
		renderer.setYLabelsAlign(Align.LEFT);
		renderer.setChartTitle("Closure Profile");
		renderer.setXTitle("Date");
		renderer.setYTitle("Closure");
		XYSeriesRenderer r = new XYSeriesRenderer();
		r.setColor(Color.WHITE);
		renderer.addSeriesRenderer(r);
		renderer.setZoomButtonsVisible(true);
		return renderer;
	}

	private XYMultipleSeriesDataset getDataset() {
		XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
		TimeSeries series = new TimeSeries("Demo");
		AssetManager am = getAssets();
		try {
			InputStream is = am.open("closure.json");
			String json = readStream(is);
			is.close();
			JSONObject obj = (JSONObject)new JSONTokener(json).nextValue();
			JSONArray arr = obj.getJSONArray("data");
			double closure = 0.0;
			for (int i = 0; i < arr.length(); i++) {
				JSONArray point = arr.getJSONArray(i);
				Date d = new Date(point.getLong(0));
				double val = point.getDouble(1);
				closure += val;
				series.add(d,closure);
			}
		} catch (Exception e) {
			Log.d("graph",e.getMessage());
		}
		dataset.addSeries(series);
		return dataset;
	}

    private String readStream(InputStream is) {
		ByteArrayOutputStream output = new ByteArrayOutputStream(4096);
		byte[] buffer = new byte[4096];
		int n = 0;
		try {
			while (-1 != (n = is.read(buffer))) {
				output.write(buffer, 0, n);
			}
		} catch (IOException e) {
			Log.d("graph",e.getMessage());
			return null;
		}
		return output.toString();
	}

}