T_O T_O - 2 months ago 16
Android Question

Convert JSONArray to Object using GSON fromJson method

I have a

WCF
Webservice
, in which send a data model and i get this in
Android
by
JSon
(By Entity Framework),any ways,
I can successfully get that
JSON
by this code and store all
JSON
Objects in
JSONArray
in the
AsyncTas
class, and in :

public class Consume extends AsyncTask<Void, Void, Void> {

InputStream inputStream = null;
String result = "";
private ArrayList<Contact> contacts = new ArrayList<Contact>();

@Override
protected Void doInBackground(Void... params) {
String URL = "http://x.x.x.x/MyWCF/Service1.svc/rest/getContact";
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
try {
HttpClient httpClient = new DefaultHttpClient();
HttpPost post = new HttpPost(URL);
post.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(post);
HttpEntity httpEntity = httpResponse.getEntity();
//post.setHeader("content-type", "application/json");
inputStream = httpEntity.getContent();

} catch (UnsupportedEncodingException e1) {
Log.e("UnsupportedEncoding", e1.toString());
e1.printStackTrace();
} catch (ClientProtocolException e2) {
Log.e("ClientProtocolException", e2.toString());
e2.printStackTrace();
} catch (IllegalStateException e3) {
Log.e("IllegalStateException", e3.toString());
e3.printStackTrace();
} catch (IOException e4) {
Log.e("IOException", e4.toString());
e4.printStackTrace();
}
try {
BufferedReader bReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);

StringBuilder sBuilder = new StringBuilder();

String line = null;
while ((line = bReader.readLine()) != null) {
sBuilder.append(line + "\n");
}
inputStream.close();
result = sBuilder.toString();
} catch (Exception e) {
Log.e("StringBuilding", "Error converting result " + e.toString());
}
return null;
}

@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
try {
JSONObject object = new JSONObject(result);
JSONArray jArray = object.getJSONArray("getContactResult"); //here i create the JsonArray of all JsonObjects

//Here is the solutions, We make a list of out Contact and make it as down

List<Contact> contacts;
Type listType = new TypeToken<List<Contact>>() {
}.getType();
contacts= new Gson().fromJson(String.valueOf(jArray), listType);

//And here solution is ended !

} catch (JSONException e) {
e.printStackTrace();
}
}


And i created a Contact
class
in
android
, by this code :

public class Contact {


@SerializedName("name")
private String name;

@SerializedName("lastName")
private String lastName;

@SerializedName("phoneNumber")
private String phoneNumber;

@SerializedName("latitude")
private String latitude;

@SerializedName("longitude")
private String longitude;

public void setName(String name) {
this.name = name;
}

public String getName() {
return name;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

public String getLastName() {
return lastName;
}

public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}

public String getPhoneNumber() {
return phoneNumber;
}

public void setLatitude(String latitude) {
this.latitude = latitude;
}

public String getLatitude() {
return latitude;
}

public void setLongitude(String longitude) {
this.longitude = longitude;
}

public String getLongitude() {
return longitude;
}
}


And i parse this
JSONArray
by Old ways !
By this method :

ArrayList<Contact> setFields(JSONArray jsonArray) {
ArrayList<Contact> contacts = new ArrayList<Contact>();
for(int i=0; i<jsonArray.length(); i++) {
try {
Contact contact = new Contact();
JSONObject object = (JSONObject) jsonArray.get(i);
contact.setName(object.getString("name"));
contact.setLastName(object.getString("lastName"));
contact.setPhoneNumber(object.getString("phoneNumber"));
contact.setLatitude(object.getString("latitude"));
contact.setLongitude(object.getString("longitude"));
contacts.add(contact);
} catch (JSONException e) {
e.printStackTrace();
}
}
return contacts;
}


It works, but I do not want to handle and parse
JSONArray
by this old way and wanna use
GSON
instead,any one can help me with this sample?
Here is my
JSONArray
and
JSON
Object :

{
"getContactResult": [
{
"id": 2041,
"lastName": "xxxx",
"latitude": xxx,
"longitude": xxx,
"name": "xxxx",
"phoneNumber": "xxxx"
}
]
}


Thx

Answer
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;

List<Contact> contacts;    
Type listType = new TypeToken<List<Contact>>() {
                    }.getType();
 contacts= new Gson().fromJson(jsonArray, listType);

This should work. make sure that your model class has same name as of json parameters and datatype. it will parse the jsonarray to type List of java

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