Question

我写了应用程序的代码，只是学习如何做到这一点。我在1月份完成了它并且它工作了。该应用程序应该在Google地图上找到给定的路径。它曾经工作到上周末。昨天我尝试了它，它不起作用。我的意思是，似乎应用程序无法询问Google服务器的路径。代码是：

public class asker {    
    public String metodo(Activity act,String stringUrl) throws IOException,      JSONException{
        String polyline="";
        JSONArray array;
        StringBuilder response = new StringBuilder();
        URL url = new URL(stringUrl);
        try{
        HttpURLConnection httpconn = (HttpURLConnection) url.openConnection();
        //httpconn.setConnectTimeout (4000);
        //httpconn.setReadTimeout (4000);
        if ((act!=null)&&httpconn.getResponseCode() == HttpURLConnection.HTTP_OK){
            BufferedReader input = new BufferedReader(
                    new InputStreamReader(httpconn.getInputStream()),
                    8192);
            String strLine = null;
            while ((strLine = input.readLine()) != null) {
                response.append(strLine);
            }
            input.close();
        }
        String jsonOutput = response.toString();

        JSONObject jsonObject = new JSONObject(jsonOutput);

        // routesArray contains ALL routes
        JSONArray routesArray = jsonObject.getJSONArray("routes");
        // Grab the first route
        JSONObject route = routesArray.getJSONObject(0);

        JSONObject poly = route.getJSONObject("overview_polyline");
        polyline = poly.getString("points");

        } catch (ClientProtocolException e) {//devo gestire le eccezioni anche qui
            //per evitare lo shut down della activity tappa
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return polyline;

    }  
    }

我用来请求路径的网址类似于：http://maps.googleapis.com/maps/api/directions/json?origin=Boston,MA&destination=Concord,MA&waypoints=Charlestown,MA|Lexington,MA&sensor=false。

过去一直工作到上周末。我错过了关于地图API的新内容吗？先感谢您。

logcat的：

03-06 18:12:09.570: W/System.err(10908): org.json.JSONException: Index 0 out of range [0..0)
03-06 18:12:09.570: W/System.err(10908):    at org.json.JSONArray.get(JSONArray.java:282)
03-06 18:12:09.575: W/System.err(10908):    at org.json.JSONArray.getJSONObject(JSONArray.java:510)
03-06 18:12:09.575: W/System.err(10908):    at com.example.senarumvinea.asker.metodo(asker.java:44)
03-06 18:12:09.575: W/System.err(10908):    at com.example.senarumvinea.Tappa2$GetDirection.doInBackground(Tappa2.java:360)
03-06 18:12:09.575: W/System.err(10908):    at com.example.senarumvinea.Tappa2$GetDirection.doInBackground(Tappa2.java:1)
03-06 18:12:09.575: W/System.err(10908):    at android.os.AsyncTask$2.call(AsyncTask.java:288)
03-06 18:12:09.575: W/System.err(10908):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
03-06 18:12:09.575: W/System.err(10908):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
03-06 18:12:09.575: W/System.err(10908):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
03-06 18:12:09.575: W/System.err(10908):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
03-06 18:12:09.575: W/System.err(10908):    at java.lang.Thread.run(Thread.java:811)

即使我没有更改任何代码行，我的android应用程序也停止了工作

0 个答案: