期望BEGIN_ARRAY,但是在BEGIN_OBJECT第1行第2列.....当在Android中使用GSON解析JSON时出错? [英] Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 .....Error when trying to Parse JSON using GSON in Android?
问题描述
public class MainActivity extends Activity {
MenuFields menuFieldInstance [];
Gson gson = new Gson();
String jsonObjectString ={\\\
\\\
\\\
[\\\
\id \:22,\\\
\menu_id \:1,\\ \\ n \field_type_id \:1,\ n \c4w_code \:\1234 \,\\\
\field_label \:\Customer No \ ,\ \\ n \field_values \:\\,\\\
\date_Created \:\2012-09-16 05:11:23 \,\\\
\date_modified \:\2013-11-20 10:33:23 \,\\\
\is_required\:0,\\\
\is_static\:1 ,\ \\ \\ \\field_order \:1 \\\
],\\\
[\\\
\id \:23, n \field_type_id \:1,\ n \c4w_code \:\1234 \,\\ \\ \\field_label \:\Company Name \, \\\
\field_values \:\\,\\\
\date_Created \:\2012-09-16 05:11:56 \,\\\
\\ \\date_modified \:\2013-11-20 10:33:23 \\ ,\\is_required \:1,\\\\is_static\:1,\\\\field_order\:3 \\\
] \\\\\ };
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
Log.i(用于测试的Json字符串,+ jsonObjectString);
}
private void getCustomerMenuFieldsData(String parameter){
menuFieldInstance = gson.fromJson(jsonObjectString,MenuFields []。class);
for(int i = 0; i< jsonObjectString.length(); i ++){
Log.i(menuField Instance,+ menuFieldInstance [i] .getId());
}
}
}
请忽略大括号的错误。
i得到Error.Here是Logcat:
12-30 23:30:29.190:E / AndroidRuntime( 15833):致命异常:AsyncTask#3
12-30 23:30:29.190:E / AndroidRuntime(15833):java.lang.RuntimeException:执行doInBackground()时发生错误
12-30 23:30:29.190:E / AndroidRuntime(15833):at android.os.AsyncTask $ 3.done(AsyncTask.java:299)
12-30 23:30:29.190:E / AndroidRuntime(15833):at java.util.concurrent.FutureTask $ Sync.innerSetException(FutureTask.java:273)
12-30 23:30:29.190:E / AndroidRuntime(15833):在java.util.concurrent.FutureTask.setException(FutureTask .java:124)
12-30 23:30:29.190:E / AndroidRuntime(15833):在java.util.concurrent.FutureTask $ Sync.innerRun(FutureTask.java:307)
12- 30 23:30:29.190:E / AndroidRuntime(15833):在java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-30 23:30:29.190:E / AndroidRuntime(15833) :在android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:230)
12-30 23 :30:29.190:E / AndroidRuntime(15833):在java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-30 23:30:29.190:E / AndroidRuntime(15833):at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:569)
12-30 23:30:29.190:E / AndroidRuntime(15833):在java.lang.Thread.run(Thread.java :856)
12-30 23:30:29.190:E / AndroidRuntime(15833):com.google.gson.JsonSyntaxException引发:java.lang.IllegalStateException:预期的BEGIN_ARRAY,但在BEGIN_OBJECT行1列2
12-30 23:30:29.190:E / AndroidRuntime(15833):com.google.gson.Gson.fromJson(Gson.java:815)
12-30 23:30:29.190: E / AndroidRuntime(15833):com.google.gson.Gson.fromJson(Gson.java:768)
12-30 23:30:29.190:E / AndroidRuntime(15833):com.google.gson .Gson.fromJson(Gson.java:717)
12-30 23:30:29.190:E / AndroidRuntime(15833):com.google.gson.Gson.fromJson(Gson.java:689)
12-30 23:30:29.190:E / AndroidRuntime(15833): at com.survey.management.activity.MainActivity $ RequestForCustomerMenuFields.getCustomerMenuFieldsData(MainActivity.java:480)
12-30 23:30:29.190:E / AndroidRuntime(15833):at com.survey.management.activity。 MainActivity $ RequestForCustomerMenuFields.doInBackground(MainActivity.java:456)
12-30 23:30:29.190:E / AndroidRuntime(15833):at com.survey.management.activity.MainActivity $ RequestForCustomerMenuFields.doInBackground(MainActivity.java :1)
12-30 23:30:29.190:E / AndroidRuntime(15833):在android.os.AsyncTask $ 2.call(AsyncTask.java:287)
12-30 23:30: 29.190:E / AndroidRuntime(15833):在java.util.concurrent.FutureTask $ Sync.innerRun(FutureTask.java:305)
12-30 23:30:29.190:E / AndroidRuntime(15833):.. 。5 more
12-30 23:30:29.190:E / AndroidRuntime(15833):引起:java.lang.IllegalStateException:预期的BEGIN_ARRAY,但是BEGIN_OBJECT在第1行第2列
12-30 23 :30:29.190:E / AndroidRuntime(15833):com.google.gson.stream.JsonReader.begin Array(JsonReader.java:338)
12-30 23:30:29.190:E / AndroidRuntime(15833):at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:70)
12-30 23:30:29.190:E / AndroidRuntime(15833):com.google.gson.Gson.fromJson(Gson.java:803)
12-30 23:30:29.190:E / AndroidRuntime(15833):... 13 more
错误在此行上:
menuFieldInstance = gson.fromJson(jsonObjectString,MenuFields []。class);
首先,您的jsonString无效。您可以在 http://jsonviewer.stack.hu/ 进行测试。我修改了一下,使其有效:
final GsonBuilder builder = new GsonBuilder();
final Gson gson = builder.create();
String jsonObjectString ={\menu_fields \:[{\id \:22,\menu_id \:1,\field_type_id \ :1,\c4w_code \:\1234 \,\field_label \:\Customer No \,\field_values \:\\ ,\date_created \:\2012-09-16 05:11:23 \,\date_modified \:\2013-11-20 10:33:23 \ ,\is_required \:0,\is_static \:1,\field_order \:1},{\id \:23,\menu_id \ :1,\field_type_id \:1,\c4w_code \:\1234 \,\field_label \:\公司名称\,\field_values \:\\,\date_created \:\2012-09-16 05:11:56 \,\date_modified \:\2013-11 -20:10:33:23,\\is_required \:1,\is_static \:1,\field_order \:3}]};
尝试{
MenuFieldHolder menuFieldHolder = gson.fromJson(jsonObjectString,MenuFieldHolder.class);
Log.i(TAG,Result:+ menuFieldHolder.toString());
} catch(Throwable t){
t.printStackTrace();
}
并且您的 MenuFieldHolder
和 MenuField
类应该如下所示:
private class MenuFieldHolder {
@SerializedName(menu_fields)
private MenuField [] menuFields;
}
private class MenuField {
private int id;
@SerializedName(menu_id)
private int menuId;
@SerializedName(field_type)
private int fieldType;
@SerializedName(c4w_code)
private String c4wCode;
@SerializedName(field_label)
private String fieldLabel;
@SerializedName(field_values)
private String fieldValues;
@SerializedName(date_created)
private String dateCreated;
@SerializedName(date_modified)
private String dateModified;
@SerializedName(is_required)
private int isRequired;
@SerializedName(is_static)
private int isStatic;
@SerializedName(field_order)
private String fieldOrder;
}
或没有 SerializedName
注释(我更喜欢上面的内容,因为使用camel case字段名称是Java的最佳实践):
private class MenuFieldHolder {
private MenuField [] menu_fields;
}
private class MenuField {
private int id;
private int menu_id;
private int field_type;
private String c4w_code;
private String field_label;
私人字符串field_values;
private String date_created;
private String date_modified;
private int is_required;
private int is_static;
private String field_order;
}
i am newbie in android.this is JSONString i have stored locally in my project.
public class MainActivity extends Activity {
MenuFields menuFieldInstance[];
Gson gson = new Gson();
String jsonObjectString = "{\n\n\n [\n \"id\": 22,\n \"menu_id\": 1,\n \"field_type_id\": 1,\n \"c4w_code\": \"1234\",\n \"field_label\": \"Customer No\",\n \"field_values\": \"\",\n \"date_Created\": \"2012-09-16 05:11:23\",\n \"date_modified\": \"2013-11-20 10:33:23\",\n \"is_required\": 0,\n \"is_static\": 1,\n \"field_order\": 1\n ],\n [\n \"id\": 23,\n \"menu_id\": 1,\n \"field_type_id\": 1,\n \"c4w_code\": \"1234\",\n \"field_label\": \"Company Name\",\n \"field_values\": \"\",\n \"date_Created\": \"2012-09-16 05:11:56\",\n \"date_modified\": \"2013-11-20 10:33:23\",\n \"is_required\": 1,\n \"is_static\": 1,\n \"field_order\": 3\n ]\n\n}";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
Log.i("Json String for testing", "" + jsonObjectString);
}
private void getCustomerMenuFieldsData(String parameter) {
menuFieldInstance = gson.fromJson(jsonObjectString, MenuFields[].class);
for (int i = 0; i < jsonObjectString.length(); i++) {
Log.i("menuField Instance ", "" + menuFieldInstance[i].getId());
}
}
}
please ignore mistakes of curly braces. i am getting Error.Here is the Logcat:
12-30 23:30:29.190: E/AndroidRuntime(15833): FATAL EXCEPTION: AsyncTask #3
12-30 23:30:29.190: E/AndroidRuntime(15833): java.lang.RuntimeException: An error occured while executing doInBackground()
12-30 23:30:29.190: E/AndroidRuntime(15833): at android.os.AsyncTask$3.done(AsyncTask.java:299)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-30 23:30:29.190: E/AndroidRuntime(15833): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.lang.Thread.run(Thread.java:856)
12-30 23:30:29.190: E/AndroidRuntime(15833): Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.Gson.fromJson(Gson.java:815)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.Gson.fromJson(Gson.java:768)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.Gson.fromJson(Gson.java:717)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.Gson.fromJson(Gson.java:689)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.getCustomerMenuFieldsData(MainActivity.java:480)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.doInBackground(MainActivity.java:456)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.doInBackground(MainActivity.java:1)
12-30 23:30:29.190: E/AndroidRuntime(15833): at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-30 23:30:29.190: E/AndroidRuntime(15833): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-30 23:30:29.190: E/AndroidRuntime(15833): ... 5 more
12-30 23:30:29.190: E/AndroidRuntime(15833): Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:70)
12-30 23:30:29.190: E/AndroidRuntime(15833): at com.google.gson.Gson.fromJson(Gson.java:803)
12-30 23:30:29.190: E/AndroidRuntime(15833): ... 13 more
Error is on this Line:
menuFieldInstance = gson.fromJson(jsonObjectString,MenuFields[].class);
Firstly your jsonString is not valid. You can test it at http://jsonviewer.stack.hu/. I've modified it a bit to make it valid:
final GsonBuilder builder = new GsonBuilder();
final Gson gson = builder.create();
String jsonObjectString ="{\"menu_fields\":[{\"id\": 22, \"menu_id\": 1, \"field_type_id\": 1, \"c4w_code\": \"1234\", \"field_label\": \"Customer No\", \"field_values\": \"\", \"date_created\": \"2012-09-16 05:11:23\", \"date_modified\": \"2013-11-20 10:33:23\", \"is_required\": 0, \"is_static\": 1, \"field_order\": 1 }, {\"id\": 23, \"menu_id\": 1, \"field_type_id\": 1, \"c4w_code\": \"1234\", \"field_label\": \"Company Name\", \"field_values\": \"\", \"date_created\": \"2012-09-16 05:11:56\", \"date_modified\": \"2013-11-20 10:33:23\", \"is_required\": 1, \"is_static\": 1, \"field_order\": 3 }]}";
try {
MenuFieldHolder menuFieldHolder= gson.fromJson(jsonObjectString, MenuFieldHolder.class);
Log.i("TAG", "Result: " + menuFieldHolder.toString());
} catch (Throwable t) {
t.printStackTrace();
}
And your MenuFieldHolder
and MenuField
classes should be like below:
private class MenuFieldHolder {
@SerializedName("menu_fields")
private MenuField[] menuFields;
}
private class MenuField {
private int id;
@SerializedName("menu_id")
private int menuId;
@SerializedName("field_type")
private int fieldType;
@SerializedName("c4w_code")
private String c4wCode;
@SerializedName("field_label")
private String fieldLabel;
@SerializedName("field_values")
private String fieldValues;
@SerializedName("date_created")
private String dateCreated;
@SerializedName("date_modified")
private String dateModified;
@SerializedName("is_required")
private int isRequired;
@SerializedName("is_static")
private int isStatic;
@SerializedName("field_order")
private String fieldOrder;
}
or without SerializedName
annotation(I prefer above. Because using camel case field names is a best practice for Java):
private class MenuFieldHolder {
private MenuField[] menu_fields;
}
private class MenuField {
private int id;
private int menu_id;
private int field_type;
private String c4w_code;
private String field_label;
private String field_values;
private String date_created;
private String date_modified;
private int is_required;
private int is_static;
private String field_order;
}
这篇关于期望BEGIN_ARRAY,但是在BEGIN_OBJECT第1行第2列.....当在Android中使用GSON解析JSON时出错?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!