android：jsonによる解析

Question

これは解析する必要があるJson文字列です。

私は次のコードを試しました。私の目標は、logcatのjsonから取得した値を取得することです。

JSONObject json=new JSONObject(result1); 
JSONObject vehicle=json.getJSONObject("Vehicle"); 
JSONObject deviceLog=json.getJSONObject("DeviceLog"); 

String vehicleName=vehicle.getString("display_name"); 
int vehicleId=vehicle.getInt("id"); 

Double latitude=deviceLog.getDouble("latitude"); 
Double longitude=deviceLog.getDouble("longitude"); 

System.out.println(vehicleId +" "+ vehicleName+ " "+ latitude+" "+longitude); 

私はこのコードではわかりません。これは私のlogcatが示しているものです。

12-03 13:36:32.983: W/System.err(693): org.json.JSONException: A JSONObject text must begin with '{' at character 1 of [{"Vehicle":{"display_name":"galaxy","id":"14","tank_capacity":"0.00"},"Personnel":{"display_name":null,"id":null},"DeviceLog":{"latitude":"9.589788","longitude":"76.530592","direction":"0","place":"Kumarakom Lake Resort(0.12km)","speed":"0.00","stop_time":"704","status":"1","tank_status":"0.00","mileage":"0.00","alerts":null,"kms_left":"0.00","gps_time":"03-12-2011 14:12:12"}}] 
12-03 13:36:33.054: W/System.err(693): at org.json.JSONTokener.syntaxError(JSONTokener.java:448) 
12-03 13:36:33.054: W/System.err(693): at org.json.JSONObject.<init>(JSONObject.java:178) 
12-03 13:36:33.063: W/System.err(693): at org.json.JSONObject.<init>(JSONObject.java:246) 
12-03 13:36:33.063: W/System.err(693): at com.rekonsult.signon.Home.createvehicleSubList(Home.java:56) 
12-03 13:36:33.063: W/System.err(693): at com.rekonsult.signon.Home.onCreate(Home.java:35) 
12-03 13:36:33.063: W/System.err(693): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 
12-03 13:36:33.063: W/System.err(693): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 
12-03 13:36:33.063: W/System.err(693): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 
12-03 13:36:33.073: W/System.err(693): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 
12-03 13:36:33.073: W/System.err(693): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 
12-03 13:36:33.073: W/System.err(693): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-03 13:36:33.073: W/System.err(693): at android.os.Looper.loop(Looper.java:123) 
12-03 13:36:33.073: W/System.err(693): at android.app.ActivityThread.main(ActivityThread.java:4203) 
12-03 13:36:33.073: W/System.err(693): at java.lang.reflect.Method.invokeNative(Native Method) 
12-03 13:36:33.073: W/System.err(693): at java.lang.reflect.Method.invoke(Method.java:521) 
12-03 13:36:33.084: W/System.err(693): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 
12-03 13:36:33.084: W/System.err(693): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 
12-03 13:36:33.084: W/System.err(693): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

試用：

JSONArray rec=new JSONArray(result1); 

JSONObject json=rec.getJSONObject(0); 
JSONObject vehicle=json.getJSONObject("Vehicle"); 
JSONObject deviceLog=json.getJSONObject("DeviceLog"); 

String vehicleName=vehicle.getString("display_name"); 
int vehicleId=vehicle.getInt("id"); 

Double latitude=deviceLog.getDouble("latitude"); 
Double longitude=deviceLog.getDouble("longitude"); 

System.out.println(vehicleId +" "+ vehicleName+ " "+ latitude+" "+longitude); 

Answer 2

ただ、JSONの解析のためにこのコードを試してみてください：----

json = JSONfunctions.getJSONfromURL(give_yourUrl); 

    JSONObject vehicle=(JSONObject) json.getJSONObject("Vehicle"); 
    Iterator map=vehicle.keys(); 
    //Iterator iter = map.iterator(); 
    while(map.hasNext()){ 
     String key = (String)map.next(); 
     String value = vehicle.get(key).toString(); 
     Log.i("Key",""+key); 
     Log.i("Value",""+value); } 


    JSONObject deviceLog= (JSONObject) json.getJSONObject("DeviceLog"); 
    Iterator map=deviceLog.keys(); 
    //Iterator iter = map.iterator(); 
    while(map.hasNext()){ 
     String key = (String)map.next(); 
     String value = deviceLog.get(key).toString(); 
     Log.i("Key",""+key); 
     Log.i("Value",""+value); } 

がJSONfunctions.javaを作成します -

public class JSONfunctions { 

public static JSONObject getJSONfromURL(String url){ 
    InputStream is = null; 
    String result = ""; 
    JSONObject jArray = null; 

    //http post 
    try{ 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost(url); 
      HttpResponse response = httpclient.execute(httppost); 
      HttpEntity entity = response.getEntity(); 
      is = entity.getContent(); 

    }catch(Exception e){ 
      Log.e("log_tag", "Error in http connection "+e.toString()); 
    } 

    //convert response to string 
    try{ 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
        sb.append(line + "\n"); 
      } 
      is.close(); 
      result=sb.toString(); 
    }catch(Exception e){ 
      Log.e("log_tag", "Error converting result "+e.toString()); 
    } 

    try{ 

     jArray = new JSONObject(result);    
    }catch(JSONException e){ 
      Log.e("log_tag", "Error parsing data "+e.toString()); 
    } 

    return jArray; 

} 
} 

私はこのヘルプを願っています...