我尝试将JSON值解析为我的listView。我在logcat中的错误是JSON解析错误，而不是出现在ListView中的结果，而是在Toast中出现了整个JSON响应，请帮助我解决它。谢谢。
这是我的Java代码
mainActivity.java
public class MainActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView lv;
// URL to get contacts JSON
private static String url = " https://private-2a004-androidtest3.apiary-mock.com/employeesList";
ArrayList<HashMap<String, String>> employeeList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
employeeList = new ArrayList<>();
lv = (ListView) findViewById(R.id.list);
new Getemployees().execute();
}
/**
* Async task class to get json by making HTTP call
*/
private class Getemployees extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONArray employees = jsonObj.getJSONArray("contacts");
// looping through All Contacts
for (int i = 0; i < employees.length(); i++) {
JSONObject c = employees.getJSONObject(i);
String firstName = c.getString("firstName");
String lastName = c.getString("lastName");
String designation = c.getString("designation");
String city = c.getString("city");
HashMap<String, String> emp = new HashMap<>();
emp.put("firstName", firstName);
emp.put("lastName", lastName);
emp.put("designation",designation);
emp.put("city",city);
employeeList.add(emp);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG)
.show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG)
.show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, employeeList,
R.layout.list_item, new String[]{"firstName","lastName","designation", "city"},new int[]{R.id.firstName,
R.id.lastName,R.id.city,R.id.designation});
lv.setAdapter(adapter);
}
}
}
httphandler.java
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
我的logcat：
02-17 15:45:03.667 24027-24149/com.example.simple E/MainActivity: Response from url: [
{
"employee":
[
{
"id": "1",
"firstName": "Ram",
"lastName": "Kumar",
"address" : "1/20, Rich street",
"city" : "Karur",
"zipcode" : "636138",
"gender" : "male",
"dob" : "20-May-1995",
"designation":"developer",
"mobile" : "9988776655",
"email" : "tom@gmail.com",
"nationality" : "Indian",
"language" : "English",
"imageURL" : "https://dummyimage.com/500x500/d12ad1/fff.png&text=Ram",
"skills": [
{
"technical" : [ "C", "C++", "Java" ],
"extra_curricular" : ["chess", "cricket"]
}]
},
{
"id": "2",
"firstName": "Kumari",
"lastName": "Raja",
"address" : "2/20, Rich street",
"city" : "Coimbatore",
"zipcode" : "636148",
"gender" : "female",
"dob" : "10-Jun-1995",
"designation":"Tester",
"mobile" : "8899667744",
"email" : "maria@gmail.com",
"nationality" : "Indian",
"language" : "Tamil",
"imageURL" : "https://dummyimage.com/500x500/52d929/fff.png&text=Kumari",
"skills": [
{
"technical" : [ "C", "C++", ".net" ],
"extra_curricular" : ["Tennis", "Carrom"]
}]
},
{
"id": "3",
"firstName": "Raja",
"lastName": "Ravi",
"address" : "13/20, Rich street",
"city" : "Salem",
"zipcode" : "636138",
"gender" : "male",
"dob" : "22-Jan-1994",
"designation":"Team Lead",
"mobile" : "9876543210",
"email" : "raja@gmail.com",
"nationality" : "Indian",
"language" : "English",
"imageURL" : "https://dummyimage.com/500x500/bef0af/fff.png&text=Raja",
"skills": [
{
"technical" : [ "C", "C++", "Java" , "Android"],
"extra_curricular" : ["chess", "cricket"]
}]
},
{
"id": "4",
"firstName": "Sheela",
"lastName": "Ravi",
"address" : "14/20, Rich street",
"city" : "Madurai",
"zipcode" : "636200",
"gender" : "female",
"dob" : "10-Feb-1985",
"designation":"developer",
"mobile" : "5566778899",
"email" : "Sheela@gmail.com",
"nationality" : "Indian",
"language" : "Tamil",
"imageURL" : "https://dummyimage.com/500x500/e6866e/fff.png&text=Sheela",
"skills": [
{
"technical" : [ "photoshop", "Ruby" ],
"extra_curricular" : ["Carrom", "Reading books"]
}]
},
{
"id": "5",
"firstName": "Shankar",
"lastName": "Kumar",
"address" : "15/20, Rich street",
"city" : "Madurai",
"zipcode" : "636300",
"gender" : "Male",
"dob" : "10-Feb-1985",
"designation":"Sr.Developer",
"mobile" : "5566778899",
"email" : "shankar@gmail.com",
"nationality" : "Indian",
"language" : "Tamil",
"imageURL" : "https://dummyimage.com/500x500/8f3532/fff.png&text=Shankar",
"skills": [
{
"technical" : [ "C", "C++" ],
"extra_curricular" : ["chess", "Drawing"]
}]
},
{
"id": "6",
"firstName": "Suren",
"lastName": "Saker",
"address" : "16/20, Rich street",
"city" : "Salem",
"zipcode" : "636400",
"gender" : "Male",
"dob" : "14-Jan-1985",
"designat
02-17 15:45:03.676 24027-24149/com.example.simple E/MainActivity: Json parsing error: Value [{"employee":[{"id":"1","firstName":"Ram","lastName":"Kumar","address":"1/20, Rich street","city":"Karur","zipcode":"636138","gender":"male","dob":"20-May-1995","designation":"developer","mobile":"9988776655","email":"tom@gmail.com","nationality":"Indian","language":"English","imageURL":"https://dummyimage.com/500x500/d12ad1/fff.png&text=Ram","skills":[{"technical":["C","C++","Java"],"extra_curricular":["chess","cricket"]}]},{"id":"2","firstName":"Kumari","lastName":"Raja","address":"2/20, Rich street","city":"Coimbatore","zipcode":"636148","gender":"female","dob":"10-Jun-1995","designation":"Tester","mobile":"8899667744","email":"maria@gmail.com","nationality":"Indian","language":"Tamil","imageURL":"https://dummyimage.com/500x500/52d929/fff.png&text=Kumari","skills":[{"technical":["C","C++",".net"],"extra_curricular":["Tennis","Carrom"]}]},{"id":"3","firstName":"Raja","lastName":"Ravi","address":"13/20, Rich street","city":"Salem","zipcode":"636138","gender":"male","dob":"22-Jan-1994","designation":"Team Lead","mobile":"9876543210","email":"raja@gmail.com","nationality":"Indian","language":"English","imageURL":"https://dummyimage.com/500x500/bef0af/fff.png&text=Raja","skills":[{"technical":["C","C++","Java","Android"],"extra_curricular":["chess","cricket"]}]},{"id":"4","firstName":"Sheela","lastName":"Ravi","address":"14/20, Rich street","city":"Madurai","zipcode":"636200","gender":"female","dob":"10-Feb-1985","designation":"developer","mobile":"5566778899","email":"Sheela@gmail.com","nationality":"Indian","language":"Tamil","imageURL":"https://dummyimage.com/500x500/e6866e/fff.png&text=Sheela","skills":[{"technical":["photoshop","Ruby"],"extra_curricular":["Carrom","Reading books"]}]},{"id":"5","firstName":"Shankar","lastName":"Kumar","address":"15/20, Rich street","city":"Madurai","zipcode":"636300","gender":"Male","dob":"10-Feb-1985","designation":"Sr.Developer","mobile":"5566778899","email":"shankar@gmail.com","nationality":"Indian","language":"Tamil","imageURL":"https://dummyimage.com/500x500/8f3532/fff.png&text=Shankar","skills":[{"technical":["C","C++"],"extra_curricular":["chess","Drawing"]}]},{"id":"6","firstName":"Suren","lastName":"Saker","address":"16/20, Rich street","city":"Salem","zipcode":"636400","gender":"Male","dob":"14-Jan-1985","designation":"Sr.Developer","mobile":"8899776655","email":"suren@gmail.com","nationality":"Indian","language":"English","imageURL":"http://indianapublicmedia.org/arts/files/2012/04/sample-gates-9-940x626.jpg","skills":[{"technical":["Java","Android"],"extra_curricular":["Reading","Stamp collection"]}]},{"id":"7","firstName":"Rajesh","lastName":"Kumar","address":"17/20, Rich street","city":"Karur","zipcode":"636800","gender":"Male","dob":"10-Feb-1985","designation":"Sr.Developer","mobile":"5566778899","email":"shankar@gmail.com","nationality":"Indian","language":"Tamil","imageURL":"http://images.fonearena.com/blog/wp-content/uploads/2013/11/Lenovo-p780-camera-sample-10.jpg","skills":[{"technical":["C","C++"],"extra_curricular":["chess","Drawing"]}]},{"id":"8","firstName":"Sham","lastName":"Kumar","address":"18/20, Rich street","city":"Salem","zipcode":"636700","gender":"Male","dob":"08-Feb-1985","designation":"Sr.Developer","mobile":"7788996655","email":"sham@gmail.com","nationality":"Indian","language":"Tamil","imageURL":"https://taylorstaste.files.wordpress.com/2014/07/screenshot-2014-07-03-10-25-41.png","skills":[{"technical":["C","C++"],"extra_curricular":["chess","Drawing"]}]},{"id":"9","firstName":"Jayakumar","lastName":"Ravi","address":"19/20, Rich street","city":"Coimbatore","zipcode":"623300","gender":"Male","dob":"3-Mar-1986","designation":"Designer","mobile":"8879797979","email":"jaya@gmail.com","nationality":"Indian","language":"Tamil","imageURL":"http://images.fonearena.com/blog/wp-content/uploads/2013/11/google-nexus-5-macro-samples-1.jpg","skills":[{"technical":["Photoshop","Design tools"],"extra_curricular":["chess","Drawing"]}]},{
尝试这个，
try {
JSONArray jsonArray=new JSONArray(jsonStr);
JSONObject jsonObj =jsonArray.getJSONObject(0);
// Getting JSON Array node
JSONArray employees = jsonObj.getJSONArray("employee");
// looping through All Contacts
for (int i = 0; i < employees.length(); i++) {
JSONObject c = employees.getJSONObject(i);
String firstName = c.getString("firstName");
String lastName = c.getString("lastName");
String designation = c.getString("designation");
String city = c.getString("city");
HashMap<String, String> emp = new HashMap<>();
emp.put("firstName", firstName);
emp.put("lastName", lastName);
emp.put("designation",designation);
emp.put("city",city);
employeeList.add(emp);
}
} catch (final JSONException e) {
}
使用jsonarray jsarray = new jsonarray（jsonstray）jsonObject jsonobj = jsonobj = new jsonobject（jsonstr），因为您的响应是jsonarray。
json键不匹配：
JSONArray jsonArray=new JSONArray(jsonStr); // As your response is in json array format
JSONObject jsonObject =jsonArray.getJSONObject(0);
// Getting JSON Array node
JSONArray employees = jsonObject.getJSONArray("employee");
用"雇员"替换"雇员"将解决您的问题。