Android图表开发——AChartEngine

Android图表控件的开发

曾经开发过一个小程序，在Android电视机上面开发一个APP，用于显示一些统计图表的信息。最后找来找去基于Android Native开发有AChartEngine现成的组件可用，于是就直接导入jar包，看api文档进行了开发。当然这只是一个客户端程序，数据的来源需要通过服务端程序获得，项目中通过wcf返回json格式的数据。

代码片段

new Thread(new Runnable() {
@Override
public void run() {
SoapObject soapObject = Util.callWS(nameSpace, methodName2,wsdl, null);
if (soapObject != null) {
String result = soapObject.getProperty(0).toString();
Message msg = new Message();
msg.what = chart2;
msg.obj = result;
handler.sendMessage(msg);
}
}
}).start();

/**
* @param nameSpace
*            WS的命名空间
* @param methodName
*            WS的方法名
* @param wsdl
*            WS的wsdl的完整路径名
* @param params
*            WS的方法所需要的参数
* @return SoapObject对象
*/
public static SoapObject callWS(String nameSpace, String methodName,
final String wsdl, Map<String, Object> params) {
final String SOAP_ACTION = nameSpace + "/service/" + methodName;
SoapObject soapObject = new SoapObject(nameSpace, methodName);
if ((params != null) && (!params.isEmpty())) {
Iterator<Entry<String, Object>> it = params.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, Object> e = (Map.Entry<String, Object>) it
.next();
soapObject.addProperty(e.getKey(), e.getValue());
}
}

final SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
SoapEnvelope.VER11);
envelope.bodyOut = soapObject;
envelope.dotNet = true;// 兼容.NET开发的Web Service
envelope.setOutputSoapObject(soapObject);
try {
HttpTransportSE ht = new HttpTransportSE(wsdl);
ht.call(SOAP_ACTION, envelope);
if (envelope.getResponse() != null) {
SoapObject result = (SoapObject) envelope.bodyIn;
ht = null;
return result;
} else {
return null;
}
} catch (Exception e) {
Log.e("error", e.getMessage());
return null;
}
}

String result2 = (String) msg.obj;
int[] colors2 = new int[] { Color.argb(255, 10, 44, 81),Color.argb(255, 182, 34, 49) };
DefaultRenderer renderer2 = SexChart.buildCategoryRenderer(colors2);

// String result =
// "{\"Result_List\":[ { \"SEX\":\"其它\",\"NUM\":\"1\"}, {\"SEX\":\"男\",\"NUM\":\"37\"}, {\"SEX\":\"女\",\"NUM\":\"2\"}]}";
List<Map<String, Object>> list2 = Util.convertJSON2List(result2, "Result_List", new String[] { "SEX", "NUM" });
CategorySeries categorySeries = new CategorySeries("Vehicles Chart");
for (Map<String, Object> map : list2) {
categorySeries.add(map.get("SEX").toString(),
Double.parseDouble(map.get("NUM").toString()));
}
View view2 = ChartFactory.getPieChartView(Main.this,categorySeries, renderer2);
if (view2 != null) {
layout01.removeAllViews();
layout01.destroyDrawingCache();
layout01.addView(view2);
} else {
Toast.makeText(Main.this, "统计结果获取失败。", Toast.LENGTH_LONG).show();
}

public static List<Map<String, Object>> convertJSON2List(String result,String name, String[] fields) {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
try {
JSONArray array = new JSONObject(result).getJSONArray(name);
for (int i = 0; i < array.length(); i++) {
JSONObject object = (JSONObject) array.opt(i);
Map<String, Object> map = new HashMap<String, Object>();
for (String str : fields) {
map.put(str, object.get(str));
}
list.add(map);
}
} catch (JSONException e) {
Log.e("error", e.getMessage());
}
return list;
}

效果图

















参考资料：
http://www.achartengine.org/content/demo.html