JSON異常：無法在Android中將字符串轉換為JSONObject

Question

我正在使用JSON從mysql數據庫中獲取數據，並在LIstview項目中設置數據。 我的Java代碼工作正常。 但我無法在列表視圖中獲取值。 json值如何轉換。

我怎樣才能解決這個問題。

      02-27 12:47:17.548: W/System.err(637): org.json.JSONException: Value <!DOCTYPEHTMLPUBLIC"- of type java.lang.String cannot be converted to JSONObject
      02-27 12:47:17.557: W/System.err(637):    at  org.json.JSON.typeMismatch(JSON.java:107)
      02-27 12:47:17.557: W/System.err(637):    at org.json.JSONObject.<init>(JSONObject.java:158)
      02-27 12:47:17.557: W/System.err(637):    at org.json.JSONObject.<init>(JSONObject.java:171)
      02-27 12:47:17.557: W/System.err(637):    at com.amplio.upshot.AddToOutlet.onCreate(AddToOutlet.java:42)
      02-27 12:47:17.557: W/System.err(637):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
      02-27 12:47:17.568: W/System.err(637):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
      02-27 12:47:17.568: W/System.err(637):    at android.app.ActivityThread.startActivityNow(ActivityThread.java:2503)
      02-27 12:47:17.568: W/System.err(637):    at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:127)
      02-27 12:47:17.568: W/System.err(637):    at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:339)
      02-27 12:47:17.568: W/System.err(637):    at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:651)
      02-27 12:47:17.568: W/System.err(637):    at android.widget.TabHost.setCurrentTab(TabHost.java:323)
      02-27 12:47:17.568: W/System.err(637):    at com.amplio.upshot.MainActivity.onCreate(MainActivity.java:112)
      02-27 12:47:17.568: W/System.err(637):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
      02-27 12:47:17.578: W/System.err(637):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
      02-27 12:47:17.578: W/System.err(637):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
      02-27 12:47:17.578: W/System.err(637):    at android.app.ActivityThread.access$2300(ActivityThread.java:125)
      02-27 12:47:17.578: W/System.err(637):    at           android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
      02-27 12:47:17.578: W/System.err(637):    at android.os.Handler.dispatchMessage(Handler.java:99)
      02-27 12:47:17.578: W/System.err(637):    at android.os.Looper.loop(Looper.java:123)
      02-27 12:47:17.578: W/System.err(637):    at android.app.ActivityThread.main(ActivityThread.java:4627)
      02-27 12:47:17.578: W/System.err(637):    at java.lang.reflect.Method.invokeNative(Native Method)
      02-27 12:47:17.578: W/System.err(637):    at java.lang.reflect.Method.invoke(Method.java:521)
      02-27 12:47:17.578: W/System.err(637):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
      02-27 12:47:17.578: W/System.err(637):    at         com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
      02-27 12:47:17.588: W/System.err(637):    at dalvik.system.NativeStart.main(Native Method)

我的JSON結果

{
"customer": [
    {
        "success": "1",
        "bus_name": "radeonpixels",
        "bus_id": "B108"
    },
    {
        "success": "1",
        "bus_name": "Om Sweets",
        "bus_id": "B109"
    }
]
}

AddToOutlet.java

 public class AddToOutlet extends Activity {
SessionManager session;
String success, cus_id, bus_id;
ArrayList<Item> item;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.addtooutlet);
    session = new SessionManager(getApplicationContext());
    session.checkLoginback();

    item = new ArrayList<Item>();
    // get user data from session
    HashMap<String, String> user = session.getUserDetails();
    // ID
    final String cus_id = user.get(SessionManager.KEY_ID);
    ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
    postParameters.add(new BasicNameValuePair("cus_id", cus_id));
    String response = null;
    try {
        response = LoginHttpClient.executeHttpPost(
                "http://10.0.2.2/android_api/add_to_outlet.php",
                postParameters);
        response = response.toString();
        response = response.replaceAll("\\s+", "");
        JSONObject json = new JSONObject(response);
        JSONArray jArray = json.getJSONArray("customer");
        for (int i = 0; i < jArray.length(); i++) {
            JSONObject json_data = jArray.getJSONObject(i);
            Item it = new Item();
            it.setBusname(json_data.getString("bus_name"));
            it.setBusid(json_data.getString("bus_id"));

            item.add(it);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    ListView lv = (ListView) findViewById(R.id.list);
    MyAdapter adapter = new MyAdapter(AddToOutlet.this,
            R.layout.addtooutlet_list_item, item);
    lv.setAdapter(adapter);
}
}

Answer 1

首先使用適當的內容和標准代碼。

編寫基本的網絡發布操作，例如：

HttpClient client = new DefaultHttpClient();
HttpPost postStuff = new HttpPost("http://10.0.2.2/android_api/add_to_outlet.php");

然后使用post執行客戶端，並將其保存在HttpResponse變量中，而不是簡單的字符串中。

您所做的。 String response = null;

但您必須這樣做：

 HttpResponse response = client.execute(postStuff); 

現在，您可以通過response.getEntity().getContent()獲得服務器的收益，或者您還可以檢查其狀態，例如response.getStatusLine.getStatusCode() 。

問題：

    response = response.toString();
    response = response.replaceAll("\\s+", "");

在這里，您將刪除字符串中的所有空格，因此很難識別JsonObject。 我認為這很難解決。

如果返回類型是完美的，則您的代碼如下所示：

HttpClient client = new DefaultHttpClient();
HttpPost postStuff = new HttpPost("http://10.0.2.2/android_api/add_to_outlet.php");
HttpResponse response = null;
try{
response = client.execute(postStuff);
Bufferedreader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent());

String mReturnDta = "";
while((data = reader.readLine()) != null){
JsonObject json = new JsonObject(mReturnDta);
//Now fetch the jsonarray and do whatever you want...
}    
}catch(...)