ParseJson.java，如果没有数组名称，则解析结果? [英] ParseJson.java, Parsing result if NO array name?
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问题描述
这是我的代码:
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Created by Belal on 9/22/2015.
*/
public class ParseJSON {
public static String[] make;
public static String[] model;
public static String[] sixMonthRate;
public static final String JSON_ARRAY = "result";
public static final String KEY_MAKE = "make";
public static final String KEY_MODEL = "model";
public static final String KEY_SIXMONTHRATE = "sixMonthRate";
private JSONArray vehicle = null;
private String json;
public ParseJSON(String json){
this.json = json;
}
protected void parseJSON(){
JSONObject jsonObject=null;
try {
jsonObject = new JSONObject(json);
vehicle = jsonObject.getJSONArray(JSON_ARRAY);
make = new String[vehicle.length()];
model = new String[vehicle.length()];
sixMonthRate = new String[vehicle.length()];
for(int i=0;i<vehicle.length();i++){
JSONObject jo = vehicle.getJSONObject(i);
make[i] = jo.getString(KEY_MAKE);
model[i] = jo.getString(KEY_MODEL);
sixMonthRate[i] = jo.getString(KEY_SIXMONTHRATE);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
如果我将使用 DVLA JSON数据库，并且没有数组名称，我应该如何更改代码才能使其正常工作?
If I will use DVLA JSON DATABASE and there is no ARRAY name , how should I change the code to make it work?
当前，如果我按按钮获取数据，则结果是应用程序关闭.
Currently if I press button get the data, I have result as app closed.
我正在使用本教程-此处
错误获取
03-26 02:49:43.467 23673-23673/com.sandro.openalprsample W/System.err: org.json.JSONException: No value for result
03-26 02:49:43.467 23673-23673/com.sandro.openalprsample W/System.err: at org.json.JSONObject.get(JSONObject.java:389)
03-26 02:49:43.467 23673-23673/com.sandro.openalprsample W/System.err: at org.json.JSONObject.getJSONArray(JSONObject.java:584)
03-26 02:49:43.467 23673-23673/com.sandro.openalprsample W/System.err: at com.sandro.openalprsample.ParseJSON.parseJSON(ParseJSON.java:42)
03-26 02:49:43.467 23673-23673/com.sandro.openalprsample W/System.err: at com.sandro.openalprsample.DVLAresult.showJSON(DVLAresult.java:60)
03-26 02:49:43.467 23673-23673/com.sandro.openalprsample W/System.err: at com.sandro.openalprsample.DVLAresult.access$000(DVLAresult.java:18)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.sandro.openalprsample.DVLAresult$1.onResponse(DVLAresult.java:44)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.sandro.openalprsample.DVLAresult$1.onResponse(DVLAresult.java:41)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at android.os.Looper.loop(Looper.java:145)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5832)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at java.lang.reflect.Method.invoke(Native Method)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample D/AndroidRuntime: Shutting down VM
03-26 02:49:43.472 23673-23673/com.sandro.openalprsample E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sandro.openalprsample, PID: 23673
java.lang.NullPointerException: storage == null
at java.util.Arrays$ArrayList.<init>(Arrays.java:38)
at java.util.Arrays.asList(Arrays.java:155)
at android.widget.ArrayAdapter.<init>(ArrayAdapter.java:128)
at com.sandro.openalprsample.CustomList.<init>(CustomList.java:21)
at com.sandro.openalprsample.DVLAresult.showJSON(DVLAresult.java:61)
at com.sandro.openalprsample.DVLAresult.access$000(DVLAresult.java:18)
at com.sandro.openalprsample.DVLAresult$1.onResponse(DVLAresult.java:44)
at com.sandro.openalprsample.DVLAresult$1.onResponse(DVLAresult.java:41)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60)
at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30)
at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5832)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
推荐答案
很遗憾，我没有遵循您的代码.根据您提供的信息，我看不到任何JSON数组.作为此响应的扩展，我进行了一些修改并访问JSON对象中的数据.这里是补充.
Unfortunately I don't follow your code. Base on what you have provide I don't see any JSON Array. As an extension to this response I made few modifications and access the data in the JSON object. Here are the additions.
从此处
HandleJSON obj = new HandleJSON("");
obj.readAndParseJSON(responseOutput.toString());
output.append(System.getProperty("line.separator") + "\nJSON Object... " + System.getProperty("line.separator") + "Make : " + obj.getMake() + "\nModel : " + obj.getModel());
output.append("\nSix Month Rate : " + obj.getSixMonthRate() + "\nTwelve Month Rate : " + obj.getTwelveMonthRate() + "\nDate of First Registration : " + obj.getDateofFirstRegistrationegistration());
output.append("\nYear of Manufacture : " + obj.getYearOfManufacture() + "\nCylinder Capacity : " + obj.getCylinderCapacity() + "\nCO2 Emmissions : " + obj.getCo2Emissions());
HandleJSON.java
import org.json.JSONObject;
import android.annotation.SuppressLint;
public class HandleJSON {
private String make = "make";
private String model = "model";
private String sixMonthRate = "sixMonthRate";
private String twelveMonthRate = "twelveMonthRate";
private String dateofFirstRegistration = "dateofFirstRegistration";
private String yearOfManufacture = "yearOfManufacture";
private String cylinderCapacity = "cylinderCapacity";
private String co2Emissions= "co2Emissions";
public HandleJSON(String url) {this.urlString = url;}
public void setURL(String url){ this.urlString = url;}
public String getMake() {return make;}
public String getModel() {return model;}
public String getSixMonthRate() {return sixMonthRate;}
public String getTwelveMonthRate() {return twelveMonthRate;}
public String getDateofFirstRegistrationegistration() {return dateofFirstRegistration;}
public String getYearOfManufacture() {return yearOfManufacture;}
public String getCylinderCapacity() {return cylinderCapacity;}
public String getCo2Emissions() {return co2Emissions;}
@SuppressLint("NewApi")
public void readAndParseJSON(String in) {
try {
JSONObject reader = new JSONObject(in);
make = reader.getString("make");
model = reader.getString("model");
sixMonthRate = reader.getString("sixMonthRate");
twelveMonthRate = reader.getString("twelveMonthRate");
dateofFirstRegistration= reader.getString("dateOfFirstRegistration");
yearOfManufacture= reader.getString("yearOfManufacture");
cylinderCapacity= reader.getString("cylinderCapacity");
co2Emissions= reader.getString("co2Emissions");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
这是输出
参考:
- JSON格式化程序
- HttpUrlConnection，其中POST请求和参数作为Json对象android
- ANDROID，解析JSON数据从Web服务器上显示在ListView上
- Android天气应用程序:JSON，HTTP和Openweathermap
- Android HTTP客户端:GET，POST，下载，上传，分段请求
- 使用HttpURLConnection的Android POST请求
- JSON Formatter
- HttpUrlConnection with post request and parameter as Json object android
- ANDROID, Parse JSON data from a web server and display on ListView
- Android weather app: JSON, HTTP and Openweathermap
- Android HTTP Client: GET, POST, Download, Upload, Multipart Request
- Android POST request using HttpURLConnection
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