如何將JSON對象轉換爲JSON數組？

-1

如何將此轉換爲JSONObject到JSONArray以將其列在Android的ListView中？如何將JSON對象轉換爲JSON數組？

{ 
    "42": "42 Coin", 
    "365": "365Coin", 
    "404": "404Coin", 
    "611": "SixEleven", 
    "808": "808", 
    "888": "Octocoin", 
    "1337": "1337", 
    "2015": "2015 coin", 
    "CLUB": " ClubCoin", 
    "007": "007 coin", 
    "ZRX": "0x", 
    "BIT16": "16BitCoin" 
}

我嘗試使用下面的代碼

try { 

     String resp = loadJSONFromAsset(); 
     JSONObject ob = new JSONObject(resp); 
     JSONArray arr = ob.getJSONArray(""); 

     for(int i=0; i<arr.length(); i++){ 
      JSONObject o = arr.getJSONObject(i); 
      System.out.println(o); 
     } 


    } 
catch (JSONException e) { 
    e.printStackTrace(); 
}

但它顯示以下錯誤

09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err: org.json.JSONException: No value for 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at org.json.JSONObject.get(JSONObject.java:389) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at org.json.JSONObject.getJSONArray(JSONObject.java:584) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at com.example.alexmathew.myapplication.MainActivity.onCreate(MainActivity.java:47) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.Activity.performCreate(Activity.java:6662) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.ActivityThread.-wrap12(ActivityThread.java) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.os.Handler.dispatchMessage(Handler.java:102) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.os.Looper.loop(Looper.java:154) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at android.app.ActivityThread.main(ActivityThread.java:6077) 
09-15 02:13:10.947 2296-2296/com.example.alexmathew.myapplication W/System.err:  at java.lang.reflect.Method.invoke(Native Method) 
09-15 02:13:10.948 2296-2296/com.example.alexmathew.myapplication W/System.err:  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 
09-15 02:13:10.948 2296-2296/com.example.alexmathew.myapplication W/System.err:  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756) 
09-15 02:13:11.884 2296-2296/com.example.alexmathew.myapplication W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView 
09-15 02:13:11.978 2296-2334/com.example.alexmathew.myapplication D/EGL_emulation: eglMakeCurrent: 0xabf053c0: ver 2 0 (tinfo 0xabf03570)

如何才能使此代碼工作？任何想法，我錯了？

來源

2017-09-14 Alex Mathew

這不是一個數組。這是一個JSON對象 – joao86

@ joao86：任何想法如何我可以使用上面的JSON列表在ListView中？ –

試試這個：https://stackoverflow.com/questions/13573913/android-jsonobject-how-can-i-loop-through-a-flat-json-object-to-get-each-key-a – joao86

{ "coin": [ 
    { 
     "42": "42 Coin" 
    }, 
    { 
     "365": "365Coin" 
    }, 
    { 
     "404": "404Coin" 
    }, 
    { 
     "611": "SixEleven" 
    }, 
    { 
     "808": "808" 
    }, 
    { 
     "888": "Octocoin" 
    }, 
    { 
     "1337": "1337" 
    }, 
    { 
     "2015": "2015 coin" 
    }, 
    { 
     "CLUB": " ClubCoin" 
    }, 
    { 
     "007": "007 coin" 
    }, 
    { 
     "ZRX": "0x" 
    }, 
    { 
     "BIT16": "16BitCoin" 
    } ] }

嘗試使用以下代碼

try{ 
String resp = loadJSONFromAsset(); 
      JSONObject ob = new JSONObject(resp); 
      JSONArray arr = ob.getJSONArray("coin"); 

      for(int i=0; i<arr.length(); i++){ 
       JSONObject o = arr.getJSONObject(i); 
       System.out.println(o); 
      } 


     }catch (JSONException e) { 
      e.printStackTrace(); 
     }

來源

2017-09-15 15:56:41

如何將JSON對象轉換爲JSON數組？

回答

相關問題