如何在 Android 中使用 JAVA 将 JSON 保存在字符串变量中？
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How to Save JSON in String variable using JAVA In Android?
提问by nida
i am newbie in android Here is JSON defined, i need to manually store this JSON in String variable using JAVA in Android.I am getting diffculty to do this.here is the code i have tried but its not correct.
我是 android 新手这里定义了 JSON，我需要在 Android 中使用 JAVA 手动将此 JSON 存储在 String 变量中。我很难做到这一点。这是我尝试过的代码，但它不正确。
String jsonObject = "{
{
"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
}
}";
i need to store it either in String or in JSONObject so that i can move a head to work with this. after adding code :
我需要将它存储在 String 或 JSONObject 中，以便我可以移动头来处理它。添加代码后：
MenuFields menuFieldInstance[];// an array of bean Class
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;
menuFieldInstance = gson.fromJson(jsonObjectString,MenuFields[].class);
for(int i=0;i<jsonObjectString.length();i++)
{
Log.i("menuField Instance ",""+menuFieldInstance[i].getId());
}
}
i am getting this logCat:
我得到这个 logCat：
12-30 22:56:47.745: E/AndroidRuntime(2238): FATAL EXCEPTION: AsyncTask #3 12-30 22:56:47.745: E/AndroidRuntime(2238): java.lang.RuntimeException: An error occured while executing doInBackground() 12-30 22:56:47.745: E/AndroidRuntime(2238): at android.os.AsyncTask$3.done(AsyncTask.java:299) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 12-30 22:56:47.745: E/AndroidRuntime(2238): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.lang.Thread.run(Thread.java:856) 12-30 22:56:47.745: E/AndroidRuntime(2238): Caused by: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:815) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:768) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:717) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:689) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.getCustomerMenuFieldsData(MainActivity.java:480) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.doInBackground(MainActivity.java:456) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.doInBackground(MainActivity.java:1) 12-30 22:56:47.745: E/AndroidRuntime(2238): at android.os.AsyncTask$2.call(AsyncTask.java:287) 12-30 22:56:47.745: E/AndroidRuntime(2238): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 12-30 22:56:47.745: E/AndroidRuntime(2238): ... 5 more 12-30 22:56:47.745: E/AndroidRuntime(2238): Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:70) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:803) 12-30 22:56:47.745: E/AndroidRuntime(2238): ... 13 more
12-30 22:56:47.745: E/AndroidRuntime(2238): 致命异常: AsyncTask #3 12-30 22:56:47.745: E/AndroidRuntime(2238): java.lang.RuntimeException: 执行 doInBackground 时出错() 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 android.os.AsyncTask$3.done(AsyncTask.java:299) 12-30 22:56:47.745: E/AndroidRuntime(2238):在 java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 java.util.concurrent.FutureTask.setException(FutureTask.java: 124) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 12-30 22:56:47.745: E/AndroidRuntime( 2238)：在 java.util.concurrent.FutureTask.run(FutureTask.java:137) 12-30 22:56:47.745：E/AndroidRuntime(2238)：在 android.os。AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 12-30 22 :56:47.745: E/AndroidRuntime(2238): 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 java. lang.Thread.run(Thread.java:856) 12-30 22:56:47.745: E/AndroidRuntime(2238): 由: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: 预期为 BEGIN_ARRAY 但为 BEGIN_OBJECT在第 1 行第 2 列 12-30 22:56:47.745：E/AndroidRuntime(2238)：在 com.google.gson.Gson.fromJson(Gson.java:815) 12-30 22:56:47.745：E/AndroidRuntime (2238)：在 com.google.gson.Gson.fromJson(Gson.java:768) 12-30 22:56:47.745：E/AndroidRuntime(2238)：在 com.google。gson.Gson.fromJson(Gson.java:717) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:689) 12-30 22: 56:47.745: E/AndroidRuntime(2238): 在 com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.getCustomerMenuFieldsData(MainActivity.java:480) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在.survey.management.activity.MainActivity$RequestForCustomerMenuFields.doInBackground(MainActivity.java:456) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 com.survey.management.activity.MainActivity$RequestForCustomerMenuFields.doInBackground( MainActivity.java:1) 12-30 22:56:47.745: E/AndroidRuntime(2238): at android.os.AsyncTask$2.call(AsyncTask.java:287) 12-30 22:56:47.745: E/AndroidRuntime (2238): 在 java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 12-30 22:56:47.745: E/AndroidRuntime(2238): ... 5 更多 12-30 22:56:47.745: E/AndroidRuntime(2238): 由: java.lang.IllegalStateException: 预期的 BEGIN_ARRAY但在第 1 行第 2 列 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338) 12-30 22:56: 47.745: E/AndroidRuntime(2238): 在 com.google.gson.internal.bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:70) 12-30 22:56:47.745: E/AndroidRuntime(2238): 在 com.google .gson.Gson.fromJson(Gson.java:803) 12-30 22:56:47.745: E/AndroidRuntime(2238): ... 13 更多E/AndroidRuntime(2238)：在 com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338) 12-30 22:56:47.745：E/AndroidRuntime(2238)：在 com.google.gson.internal .bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:70) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:803) 12-30 22 :56:47.745: E/AndroidRuntime(2238): ... 13 更多E/AndroidRuntime(2238)：在 com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338) 12-30 22:56:47.745：E/AndroidRuntime(2238)：在 com.google.gson.internal .bind.ArrayTypeAdapter.read(ArrayTypeAdapter.java:70) 12-30 22:56:47.745: E/AndroidRuntime(2238): at com.google.gson.Gson.fromJson(Gson.java:803) 12-30 22 :56:47.745: E/AndroidRuntime(2238): ... 13 更多
采纳答案by Kailash Dabhi
You need to replace all your (double quotes) " to \"to compile the String object in java.
您需要替换所有（双引号）" to \"以在 java 中编译 String 对象。
Use the below string:
使用以下字符串：
String jsonObject ="{\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}";
回答by Adhikari Bishwash
replace all your doublequote (") with (\") and it will work.
用 (\") 替换所有的双引号 (") 它将起作用。
回答by ABHISHEK BHARDWAJ
Worked like a charm!!!
像魅力一样工作！！！
String jsonObject="{ {\"Filter\": \"No\",\"Data Type\": \"Aggregated\", \"Key-Fields\": \"Application IP, Client IP, Protocol, Application Port, Client Port\",\"Metric-fields\": \"Bandwidth, Packets\", \"Filter\":\"Enable\" } }";
