我正在尝试使用jsonObject和jSONArray做一些android简单的jsonParsing应用程序，以在模拟器上显示一些数据。
但问题是，系统强制关闭，并给任何人帮助我????
03-07 08:57:58.781: W/EGL_genymotion(3757): eglSurfaceAttrib not implemented
03-07 08:58:00.133: W/System.err(3757): org.json.JSONException: No value for postalCodeLookup
03-07 08:58:00.133: W/System.err(3757): at org.json.JSONObject.get(JSONObject.java:354)
03-07 08:58:00.133: W/System.err(3757): at org.json.JSONObject.getJSONArray(JSONObject.java:548)
03-07 08:58:00.133: W/System.err(3757): at com.devleb.jsonparsingactivitydemo.JSONParserHandler.handleResponse(JSONParserHandler.java:39)
03-07 08:58:00.133: W/System.err(3757): at com.devleb.jsonparsingactivitydemo.JSONParserHandler.handleResponse(JSONParserHandler.java:1)
03-07 08:58:00.133: W/System.err(3757): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:657)
03-07 08:58:00.133: W/System.err(3757): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
03-07 08:58:00.133: W/System.err(3757): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
03-07 08:58:00.149: W/System.err(3757): at android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:273)
03-07 08:58:00.149: W/System.err(3757): at com.devleb.jsonparsingactivitydemo.JsonActivityHttpClient$HTTPGetTask.doInBackground(JsonActivityHttpClient.java:43)
03-07 08:58:00.149: W/System.err(3757): at com.devleb.jsonparsingactivitydemo.JsonActivityHttpClient$HTTPGetTask.doInBackground(JsonActivityHttpClient.java:1)
03-07 08:58:00.149: W/System.err(3757): at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-07 08:58:00.149: W/System.err(3757): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
03-07 08:58:00.149: W/System.err(3757): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-07 08:58:00.149: W/System.err(3757): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
03-07 08:58:00.149: W/System.err(3757): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
03-07 08:58:00.149: W/System.err(3757): at java.lang.Thread.run(Thread.java:841)
package course.examples.Networking.AndroidHttpClientJSON;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button loadButton = (Button) findViewById(R.id.button1);
loadButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this,
NetworkingAndroidHttpClientJSONActivity.class));
}
});
}
}
package com.devleb.jsonparsingactivitydemo;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.impl.client.BasicResponseHandler;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;
public class JSONParserHandler implements ResponseHandler<List<String>> {
private static final String PLACE_NAME_TAG = "placeName";
private static final String LONGITUDE_TAG = "lng";
private static final String LATITUDE_TAG = "lat";
private static final String ADMIN_NAME_TAG = "adminCode3";
private static final String POSTAL_CODE_TAG = "postalcode";
private static final String POSTALCODE = "postalCodeLookup";
@Override
public List<String> handleResponse(HttpResponse response)
throws ClientProtocolException, IOException {
// TODO Auto-generated method stub
List<String> result = new ArrayList<String>();
String JSONResponse = new BasicResponseHandler()
.handleResponse(response);
try {
JSONObject jsonObject = (JSONObject) new JSONTokener(JSONResponse)
.nextValue();
JSONArray PostalCodes = jsonObject.getJSONArray(POSTALCODE);
for (int i = 0; i < PostalCodes.length(); i++) {
JSONObject postalCode = (JSONObject) PostalCodes.get(i);
result.add(PLACE_NAME_TAG + ":"
+ postalCode.get(PLACE_NAME_TAG) + ","
+ POSTAL_CODE_TAG + ":"
+ postalCode.get(POSTAL_CODE_TAG)
+ LATITUDE_TAG
+ ":" + postalCode.get(LATITUDE_TAG) + ","
+ LONGITUDE_TAG + ":" + postalCode.get(LONGITUDE_TAG)
+ "," + ADMIN_NAME_TAG + ":"
+ postalCode.get(ADMIN_NAME_TAG) + ","
);
}
} catch (JSONException E) {
E.printStackTrace();
}
return result;
}
}
package com.devleb.jsonparsingactivitydemo;
import java.io.IOException;
import java.util.List;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import android.app.ListActivity;
import android.net.http.AndroidHttpClient;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.ArrayAdapter;
public class JsonActivityHttpClient extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new HTTPGetTask().execute();
}
private class HTTPGetTask extends AsyncTask<Void, Void, List<String>> {
private static final String USER_NAME = "devleb";
private static final String URL = "http://api.geonames.org/postalCodeLookupJSON?postalcode=6600&country=AT&username"
+ USER_NAME;
AndroidHttpClient mClient = AndroidHttpClient.newInstance("");
@Override
protected List<String> doInBackground(Void... arg0) {
// TODO Auto-generated method stub
HttpGet request = new HttpGet(URL);
JSONParserHandler responseHandler = new JSONParserHandler();
try {
return mClient.execute(request, responseHandler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(List<String> result) {
// TODO Auto-generated method stub
if (null != mClient) {
mClient.close();
setListAdapter(new ArrayAdapter<String>(
JsonActivityHttpClient.this, R.layout.list_item, result));
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.json_activity_http_client, menu);
return true;
}
}
答案 0 :(得分：1)
网址应为
http://api.geonames.org/postalCodeLookupJSON?postalcode=6600&country=AT&username=devleb
json
{
"postalcodes": [ // postalcodes is the json array
{
"adminCode3": "70805",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Breitenwang",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7333333,
"placeName": "Breitenwang",
"lat": 47.4833333,
"adminName1": "Tirol"
},
{
"adminCode3": "70806",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Ehenbichl",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7,
"placeName": "Ehenbichl",
"lat": 47.4666667,
"adminName1": "Tirol"
},
{
"adminCode3": "70820",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Lechaschau",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7,
"placeName": "Lechaschau",
"lat": 47.4833333,
"adminName1": "Tirol"
},
{
"adminCode3": "70822",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Musau",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.6666667,
"placeName": "Musau",
"lat": 47.5333333,
"adminName1": "Tirol"
},
{
"adminCode3": "70826",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Pflach",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7,
"placeName": "Oberletzen",
"lat": 47.5166667,
"adminName1": "Tirol"
},
{
"adminCode3": "70827",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Pinswang",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.6833333,
"placeName": "Oberpinswang",
"lat": 47.5333333,
"adminName1": "Tirol"
},
{
"adminCode3": "70826",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Pflach",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7166667,
"placeName": "Pflach",
"lat": 47.5166667,
"adminName1": "Tirol"
},
{
"adminCode3": "70827",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Pinswang",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.6666667,
"placeName": "Pinswang",
"lat": 47.5333333,
"adminName1": "Tirol"
},
{
"adminCode3": "70828",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Reutte",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7166667,
"placeName": "Reutte",
"lat": 47.4833333,
"adminName1": "Tirol"
},
{
"adminCode3": "70826",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Pflach",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.7,
"placeName": "Unterletzen",
"lat": 47.5166667,
"adminName1": "Tirol"
},
{
"adminCode3": "70827",
"adminName2": "Politischer Bezirk Reutte",
"adminName3": "Pinswang",
"adminCode2": "708",
"postalcode": "6600",
"adminCode1": "07",
"countryCode": "AT",
"lng": 10.6666667,
"placeName": "Unterpinswang",
"lat": 47.5333333,
"adminName1": "Tirol"
}
]
}
org.json.JSONException：postalCodeLookup没有值
你也有
private static final String POSTALCODE = "postalCodeLookup"
然后
JSONObject jsonObject = (JSONObject) new JSONTokener(JSONResponse)
.nextValue();
JSONArray PostalCodes = jsonObject.getJSONArray(POSTALCODE);
应该是
private static final String POSTALCODE = "postalcodes"
JSONArray PostalCodes = jsonObject.getJSONArray(POSTALCODE);
答案 1 :(得分：0)
尝试将您的网址更改为：
private static final String URL =“http://api.geonames.org/postalCodeLookupJSON?postalcode=6600&country=AT&username=” + USER_NAME;
我猜你错过了“=”