我的应用程序有问题，我的logcat显示tt类型org.json.jsonobject无法转换为jsonarray。我不知道如何解决这个问题。这是什么意思？如何更改我的代码
这里是logcat信息：
10-15 06:33:05.394: E/JSON Parser(1322): Error parsing data org.json.JSONException: Value {"table2":[{"status":"queueing","phonenumber":"123","remarks":"w","peoplenumber":"5"},{"status":"","phonenumber":"345","remarks":"ss","peoplenumber":"3"},{"status":"","phonenumber":"555","remarks":"f","peoplenumber":"2"},{"status":"","phonenumber":"1345","remarks":"","peoplenumber":"5"}]} of type org.json.JSONObject cannot be converted to JSONArray
10-15 06:33:05.394: W/dalvikvm(1322): threadid=11: thread exiting with uncaught exception (group=0xa4d80b20)
10-15 06:33:05.394: E/AndroidRuntime(1322): FATAL EXCEPTION: AsyncTask #1
10-15 06:33:05.394: E/AndroidRuntime(1322): Process: com.zanqi.datatolistview, PID: 1322
10-15 06:33:05.394: E/AndroidRuntime(1322): java.lang.RuntimeException: An error occured while executing doInBackground()
10-15 06:33:05.394: E/AndroidRuntime(1322): at android.os.AsyncTask$3.done(AsyncTask.java:300)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
10-15 06:33:05.394: E/AndroidRuntime(1322): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.lang.Thread.run(Thread.java:841)
10-15 06:33:05.394: E/AndroidRuntime(1322): Caused by: java.lang.NullPointerException
10-15 06:33:05.394: E/AndroidRuntime(1322): at com.zanqi.datatolistview.MainActivity$ProgressTask.doInBackground(MainActivity.java:85)
10-15 06:33:05.394: E/AndroidRuntime(1322): at com.zanqi.datatolistview.MainActivity$ProgressTask.doInBackground(MainActivity.java:1)
10-15 06:33:05.394: E/AndroidRuntime(1322): at android.os.AsyncTask$2.call(AsyncTask.java:288)
10-15 06:33:05.394: E/AndroidRuntime(1322): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
10-15 06:33:05.394: E/AndroidRuntime(1322): ... 4 more
10-15 06:33:06.322: E/WindowManager(1322): android.view.WindowLeaked: Activity com.zanqi.datatolistview.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{5282e178 V.E..... R....... 0,0-1664,192} that was originally added here
10-15 06:33:06.322: E/WindowManager(1322): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:348)
10-15 06:33:06.322: E/WindowManager(1322): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
10-15 06:33:06.322: E/WindowManager(1322): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.Dialog.show(Dialog.java:286)
10-15 06:33:06.322: E/WindowManager(1322): at com.zanqi.datatolistview.MainActivity$ProgressTask.onPreExecute(MainActivity.java:66)
10-15 06:33:06.322: E/WindowManager(1322): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
10-15 06:33:06.322: E/WindowManager(1322): at android.os.AsyncTask.execute(AsyncTask.java:535)
10-15 06:33:06.322: E/WindowManager(1322): at com.zanqi.datatolistview.MainActivity.onCreate(MainActivity.java:44)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.Activity.performCreate(Activity.java:5231)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-15 06:33:06.322: E/WindowManager(1322): at android.os.Handler.dispatchMessage(Handler.java:102)
10-15 06:33:06.322: E/WindowManager(1322): at android.os.Looper.loop(Looper.java:136)
10-15 06:33:06.322: E/WindowManager(1322): at android.app.ActivityThread.main(ActivityThread.java:5017)
10-15 06:33:06.322: E/WindowManager(1322): at java.lang.reflect.Method.invokeNative(Native Method)
10-15 06:33:06.322: E/WindowManager(1322): at java.lang.reflect.Method.invoke(Method.java:515)
10-15 06:33:06.322: E/WindowManager(1322): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
10-15 06:33:06.322: E/WindowManager(1322): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
10-15 06:33:06.322: E/WindowManager(1322): at dalvik.system.NativeStart.main(Native Method)
这是我的代码：
public class MainActivity extends ListActivity {
private Context context;
private static String url = "http://172.22.112.190:8080/Qproject/servlet/Qaction?action_flag=find";
private static final String phonenumber = "Number";
private static final String peoplenumber = "Info";
private static final String remarks = "Remarks";
private static final String status = "status";
ArrayList<HashMap<String, String>> jsonlist = new ArrayList<HashMap<String, String>>();
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new ProgressTask(MainActivity.this).execute();
}
private class ProgressTask extends AsyncTask<String, Void, Boolean> {
private ProgressDialog dialog;
private ListActivity activity;
private Context context;
// private List<Message> messages;
public ProgressTask(ListActivity activity) {
this.activity = activity;
context = activity;
dialog = new ProgressDialog(context);
}
protected void onPreExecute() {
this.dialog.setMessage("Progress start");
this.dialog.show();
}
@Override
protected void onPostExecute(final Boolean success) {
if (dialog!=null && dialog.isShowing()){
dialog.cancel();
}
ListAdapter adapter = new SimpleAdapter(context, jsonlist,
R.layout.list_item,
new String[] {phonenumber, peoplenumber, remarks, status},
new int[] {R.id.vehicleType, R.id.vehicleColor, R.id.fuel,
R.id.status });
setListAdapter(adapter);
//select single ListView item
lv = getListView();
}
protected Boolean doInBackground(final String... args) {
JSONParser jParser = new JSONParser();
// get JSON data from URL
JSONArray json = jParser.getJSONFromUrl(url);
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remarkss = c.getString(remarks);
String statuss = c.getString(status);
HashMap<String, String> map = new HashMap<String, String>();
// Add child node to HashMap key & value
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remarkss);
map.put(status, statuss);
jsonlist.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
}
}
public class JSONParser {
static InputStream iStream = null;
static JSONArray jarray = null;
static JSONObject Jasonobject = null;
static String json = "";
public JSONParser() { }
public JSONArray getJSONFromUrl(String url) {
StringBuilder builder = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse response = client.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream content = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(content));
String line;
while ((line = reader.readLine()) != null) {
builder.append(line);
}
} else {
Log.e("==>", "Failed to download file");
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Parse String to JSON object
try {
jarray = new JSONArray( builder.toString());
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON Object
return jarray;
}
}
答案 0 :(得分：1)
问题是有两种不同类型的JSON：数组和对象。数组在外层有[]个圆形，对象有{}个圆形。
在Java世界中，Object是每个类的超类。如果JSON库是明智的，那么JSONObject将是JSONArray的超类，并且您可以将JSONObject用于所有内容。不幸的是，它并非如此;并且你必须知道你正在解析的是一个数组或一个对象，以决定是将它放入JSONArray还是JSONObject。
您获得的错误是因为您正在阅读此JSON：
{"table"... }
并尝试将其解释为JSONArray，当它真的是JSONObject时。如果您始终要从服务器获取相同类型的数据，则只需将您要解析的内容类型更改为JSONObject即可。如果它有时是一个，有时是另一个，你需要一些恶作剧来解析它之前是什么，或者try / catch块先尝试一个然后另一个。< / p>
但通常情况下，您会收到特定格式的数据，并且知道您将获得哪些数据。
答案 1 :(得分：0)
试试这段代码它会对你有所帮助，它对我有用。
InputStream mIs = null;
String result = "";
JSONArray jArrayEvent = null;
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
mIs = entity.getContent();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try{
BufferedReader bufferReader = new BufferedReader(new InputStreamReader(mIs,"iso-8859-1"),8);
StringBuilder stringBuilder = new StringBuilder();
String line = null;
while ((line = bufferReader.readLine()) != null) {
if(line.trim().equals("\n"))
continue;
stringBuilder.append(line + "\n");
}
mIs.close();
result=stringBuilder.toString();
}catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
try {
jArrayEvent = new JSONArray(result);
} catch (JSONException e) {
e.printStackTrace();
}
答案 2 :(得分：0)
JSONArray json = jParser.getJSONFromUrl(url);
只需检查你的json并将其转换为适当的JSONObjects和JSONArrays。
答案 3 :(得分：0)
您从URL解析的JSON不是JSONArray格式，而是JSONObject格式。
{"table2":[ ... ]}
前面的花括号告诉你它是一个对象。 "table2"是此对象的第一个属性，它的值是一个数组 - 可能是您想要的数组。
您可以通过此方式获取数组（在您上一个try子句中的JSONParser中）：
Jasonobject = new JSONObject(builder.toString());
jarray = Jasonobject.getJSONArray("table2");
这应该会给你你的数组。
顺便说一句，它是Java中的编码标准，用于命名驼峰大小写的变量，从小写字母开始。因此，为了编写漂亮的代码，您可以像这样重命名JSONObject变量：
static JSONObject jasonObject = null;
答案 4 :(得分：0)
String str = jParser.getJSONFromUrl(url);
JSONObject Jsonobject = new JSONObjectstr );
jarray = Jsonobject .getJSONArray("table2");
答案 5 :(得分：0)
试试这段代码，可能适合你
JSONObject table = jParser.getJSONFromUrl(url);
JSONArray json = table.getJSONArray("table2");
for (int i = 0; i < json.length(); i++) {
try {
JSONObject c = json.getJSONObject(i);
String number = c.getString(phonenumber);
String info = c.getString(peoplenumber);
String remarkss = c.getString(remarks);
String statuss = c.getString(status);
HashMap<String, String> map = new HashMap<String, String>();
// Add child node to HashMap key & value
map.put(phonenumber, number);
map.put(peoplenumber, info);
map.put(remarks, remarkss);
map.put(status, statuss);
jsonlist.add(map);
} catch (JSONException e) {
e.printStackTrace();
}
}
我认为你在jsonObject中有jasonArray