android achartengine实时柱状图例子

最近这段时间在研究android achartengine报表，如图：

通过后台来获取json数据，并解析：

public class ZTMainActivity extends Activity {
	
	/**
	 * 柱状图链接
	 */
	private static String getUrl = "http://192.168.3.168:8090/PADSupportingService/action/Struts_subway_SubwayFlowCharts_highChartsData.action";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		PADChartUtil chartUtil = PADChartUtil.getInstance();
		chartUtil.strictMode();
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_ztmain);
		//创建一个HttpClient对象  
		HttpClient httpclient = new DefaultHttpClient();
		//创建HttpGet对象 
		HttpGet request = new HttpGet(getUrl);  
		List<double[]> values = new ArrayList<double[]>();
		XYMultipleSeriesRenderer renderer = chartUtil.getXYMultipleSeriesRenderer();
		chartUtil.setChartSettings(renderer, "客流信息", "", "万人", 0.5, 18.5, 0,
				300, Color.GRAY, Color.rgb(106, 106, 113));// 画笔的颜色预先定义成浅灰色
		String pattern="00";  
		java.text.DecimalFormat df = new java.text.DecimalFormat(pattern);
		Map<Integer,String> map = new HashMap<Integer,String>();
		for(int j = 1;j < 19;j++){
			map.put(j, df.format(j+5)+":00");
		}
		String title = "";
		try {
			request.addHeader("Accept","text/json");  
			//获取响应的结果  
			HttpResponse httpResponse = httpclient.execute(request);
			//获取HttpEntity  
			HttpEntity entity=httpResponse.getEntity();  
			//获取响应的结果信息
			String json =EntityUtils.toString(entity,"UTF-8");
			//JSON的解析过程
			double [] d = null;
			List list = new ArrayList();
			if(json!=null){  
				try {
					//获取dataSets数据集
					JSONArray jsonObjs = new JSONObject(json).getJSONArray("dataSets"); 
					for(int i = 0; i < jsonObjs.length() ; i++){ 
						//获取每个dataSets数据集的名称
						String dataSetName = jsonObjs.getJSONObject(i).getString("dataSetName");
						title += dataSetName+",";
						//通过dataSets数据集来获取datas数据集
						JSONArray jsonDatas = jsonObjs.getJSONObject(i).getJSONArray("datas"); 
						d = new double[18];
						for(int j=0;j<jsonDatas.length();j++){
							//x轴坐标值
							long x_name = jsonDatas.getJSONObject(j).getLong("x_name");
							//时间格式转换
							SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
							//转换成字符串
							String sDateTime = sdf.format(x_name);
							String y_value = jsonDatas.getJSONObject(j).getString("y_value").replace(".0", "");
							java.text.DecimalFormat dfromat = new java.text.DecimalFormat("#0.00");  
							//不足则补零
							String yvalues = dfromat.format((double)(Math.round(Integer.parseInt(y_value))/10000.0));
							list.add(Double.parseDouble(yvalues));
							for(Map.Entry<Integer, String> entry: map.entrySet()) {
								if(sDateTime.equals(entry.getValue())){
									renderer.addXTextLabel(entry.getKey(), sDateTime);
									d[entry.getKey()-1] = Double.parseDouble(yvalues); 
								}else{
									renderer.addXTextLabel(entry.getKey(), entry.getValue());
								}
							}
						}
						values.add(d);
						//如果取不到数据，则默认把X轴坐标显示出来
						for(int j = 1;j < 19;j++){
							renderer.addXTextLabel(j, df.format(j+5)+":00");
						}
					}
					//设置Y轴根据数据的最大值自动增长
					renderer.setYAxisMax((Double)Collections.max(list)+50);
					/*Double max = (Double)list.get(0);     
		            Double min = (Double)list.get(0); 
					for(int m=0;m<list.size();m++){
						if (min > (Double)list.get(m)){ 
							min = (Double)list.get(m);
						}
						if (max < (Double)list.get(m)){
							max = (Double)list.get(m);
						}
					}
					System.out.println("max的值为" + max + "min的值为" + min); */
				} catch (JSONException e) {
					e.printStackTrace();
				}  
			}
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}  
		String[] titles = title.substring(0, title.length()-1).split(",");
		
		SimpleSeriesRenderer r = new SimpleSeriesRenderer();
//		r.setDisplayChartValues(true);// 设置是否在主题上方显示值
		r.setColor(Color.rgb(5, 141, 199));//设置柱状图的颜色
		renderer.addSeriesRenderer(r);
		r = new SimpleSeriesRenderer();
		r.setColor(Color.rgb(0, 88, 220));//设置柱状图的颜色
		renderer.addSeriesRenderer(r);
		r = new SimpleSeriesRenderer();
		r.setColor(Color.rgb(255, 0, 0));//设置柱状图的颜色
		renderer.addSeriesRenderer(r);
		Intent intent = ChartFactory.getBarChartIntent(this, chartUtil.buildBarDataset(titles, values), renderer,  
				       Type.DEFAULT);//构建Intent, buildBarDataset是调用AbstractDemochart中的方法.
		startActivity(intent);
		finish();
	}
}