org.json.JSONException：Value不能將type.lang.String轉換爲JSONObject

Question

我看過其他線程，但這並不能解決我的問題。 我複製了我以前的登錄類中的代碼，但突然出現此錯誤（登錄類正常工作）。

因此，這是一個具有類錯誤：

public class Absensi extends Activity { 
private static final String TAG_SUCCESS = "success"; 
private ProgressDialog pDialog; 
byte statusByte; 
private String payload = ""; 
JSONParser jsonParser; 
SessionManagement session; 
TextView t= null; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_absensi); 
    session = new SessionManagement(getApplicationContext()); 
    jsonParser = new JSONParser(); 
} 

public void onResume(){ 
    super.onResume(); 
    if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) { 
     processIntent(getIntent()); 
     new AbsenMahasiswa().execute(); 
    } 
} 

public void onBackPressed() { 
    session.unsetDataKuliah(); 
    super.onBackPressed(); 
} 

void processIntent(Intent intent) { 
    NdefMessage[] message = getNdefMessages(getIntent()); 
    for(int i=0; i<message.length; i++) { 
     for(int j=0; j<message[0].getRecords().length; j++){ 
      NdefRecord record = message[i].getRecords()[j]; 
      statusByte = record.getPayload()[0]; 
      int languageCodeLength = statusByte & 0x3F; 
      int isUTF8 = statusByte-languageCodeLength; 
      if(isUTF8 == 0x00){ 
       payload = new String(
            record.getPayload(),1+languageCodeLength, 
            record.getPayload().length-1-languageCodeLength, 
            Charset.forName("UTF-8")); 
      } 
      else if (isUTF8 == -0x80){ 
       payload = new String(
            record.getPayload(),1+languageCodeLength, 
            record.getPayload().length-1-languageCodeLength, 
            Charset.forName("UTF-16")); 
      } 
     } 
    } 
} 

NdefMessage[] getNdefMessages(Intent intent){ 
    NdefMessage[] msgs = null; 
    if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())){ 
     Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES); 
     if (rawMsgs != null) { 
      msgs = new NdefMessage[rawMsgs.length]; 
      for (int i=0; i < rawMsgs.length; i++) { 
       msgs[i] = (NdefMessage) rawMsgs[i]; 
      } 
     } 
     else { 
      byte[] empty = new byte[] {}; 
      NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, 
      empty, empty, empty); 
      NdefMessage msg = new NdefMessage(new NdefRecord[] { record }); 
      msgs = new NdefMessage[] { msg }; 
     } 
    } 
    else { 
     Log.d("Peer to Peer 2", "Unknown intent."); 
     finish(); 
    } 
    return msgs; 
} 

class AbsenMahasiswa extends AsyncTask<String, String, String> { 
    @Override 
    protected String doInBackground(String... args) { 
     // TODO Auto-generated method stub 
     String request = "absen"; 
     String npm = payload.substring(0,7); 
     String id_perangkat = payload.substring(8, payload.length()); 

     List<NameValuePair> params = new ArrayList<NameValuePair>(); 
     params.add(new BasicNameValuePair("request", request)); 
     params.add(new BasicNameValuePair("npm", npm)); 
     params.add(new BasicNameValuePair("id_perangkat", id_perangkat)); 
     params.add(new BasicNameValuePair("kode", session.getKodeKuliah())); 
     params.add(new BasicNameValuePair("jenis", session.getJenisKuliah())); 
     params.add(new BasicNameValuePair("shift", session.getShiftKuliah())); 
     Log.d("DATA", jsonParser.makeHttpRequest(session.getUrl(),"POST", params).toString()); 

     return null; 
    } 
} 

這是我的logcat和JSON是回頭率以前的對象：

09-22 14:54:39.847: E/JSON Parser(16997): Error parsing data org.json.JSONException: Value Cannot of type java.lang.String cannot be converted to JSONObject 
09-22 14:54:39.847: D/DATA(16997): {"data":[{"jenis":"Praktikum","kode":"AIF102","jam":"12:00:00","nama":"Algoritma Struktur Dasar","shift":"2","hari":"Rabu","ruangan":"Lab917"}],"success":1} 

我試着將它PHP並給了迴應：

{"success":1,"message":"Data proccessing success"} 

JSON類別：

public class JSONParser { 

static InputStream is = null; 
static JSONObject jObj = null; 
static String json = ""; 

// function get json from url 
// by making HTTP POST or GET mehtod 
public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params) { 

    // Making HTTP request 
    try { 
     // check for request method 
     if(method == "POST") { 
      // request method is POST 
      // defaultHttpClient 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 
      httpPost.setEntity(new UrlEncodedFormEntity(params)); 

      HttpResponse httpResponse = httpClient.execute(httpPost); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 

     } 
     else if(method == "GET") { 
      // request method is GET 
      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      String paramString = URLEncodedUtils.format(params, "utf-8"); 
      url += "?" + paramString; 
      HttpGet httpGet = new HttpGet(url); 

      HttpResponse httpResponse = httpClient.execute(httpGet); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 
     }  
    } 
    catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
    } 
    catch (ClientProtocolException e) { 
     e.printStackTrace(); 
    } 
    catch (IOException e) { 
     e.printStackTrace(); 
    } 

    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(); 
     json = sb.toString(); 
    } 
    catch (Exception e) { 
     Log.e("Buffer Error", "Error converting result " + e.toString()); 
    } 

    // try parse the string to a JSON object 
    try { 
     jObj = new JSONObject(json); 
    } 
    catch (JSONException e) { 
     Log.e("JSON Parser", "Error parsing data " + e.toString()); 
    } 

    // return JSON String 
    return jObj; 

} 

Answer 1

迴應應該總是解析

JSONObject object = new JSONObject(responseString);