In my application, I want to bind Json response to a target class using Volley library, But am not able to do that.
My Code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
registerComponentDownload(GalleryParser.class, Const.api.URL_GALLERY);
}//on create
private void makeJsonObjectRequest(final Class<? extends BaseModel> className, String urlJsonArry) {
JsonObjectRequest jsonObjectRequest=new JsonObjectRequest(Request.Method.GET,urlJsonArry,null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
//start gallery activity
}
} , new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
AppController.getInstance().addToRequestQueue(jsonObjectRequest);
}
private void registerComponentDownload(Class<? extends BaseModel> aClass, String url) {
makeJsonObjectRequest(aClass,Const.buildUrl(url));
}
}
Is it possible to get response in class? Or am trying in wrong direction.
Please suggest me.
Thank you.
I think you can refer to this using volley with gson library to make a Gson request
https://developer.android.com/training/volley/request-custom.html
Add Gson Library in you lib folder .
this is class formate
public class TestData {
public int success;
public String message;
public TestDatail data;
public class TestDatail
{
public int is_friend;
public int is_following;
}
}
Gson gs=new Gson();
return gs.fromJson(your Volley Library Response,TestData.class);
Method 1:Using Bundle object-->
In my case i'm passing an array from Activity A to Activity B something like this:
public void onResponse(JSONObject response)
{
ArrayList<Images> imagesArrayList = new ArrayList<Images>();
try{
if(response.has("images"))
{
JSONArray imagesList = response.getJSONArray("images");
Intent i = newIntent(ActivityA.this,ActivityB.class);
i.putExtra("jsonArray",imagesList.toString());
startActivity(i);
}
}catch(JSONException e){}
}
And in Activity B's onCreate method check for the that passed bundle something like this:
Intent i = getIntent();
if (i.hasExtra("jsonArray"))
{
String jsonArray = i.getStringExtra("jsonArray");
try {
JSONArray array = new JSONArray(jsonArray);
// do whatever you need with this array
} catch (JSONException e) {
e.printStackTrace();
}
}
Method 2: Using pojo/getters & setter
Create a pojo
Extract the required data once you receive the response using volley.
set it using setters of pojo.
start gallery activity.
get the data using getters of pojo.
Related
I get a result by using okhttp3 get method.
And Now, I want to return the result to MainActivity.
I tried using intent, but I'm failed.
Also I read this okhttp3 how to return value from async GET call. But I confused about where I have to write that code.
public interface GetLastIdCallback {
void lastId(String id);
}
my MainActivity:
getMaskInfo info = new getMaskInfo(this);
info.requestGet(latitude, longitude);
getMaskInfo Activity (I want to return JSONObject or JSONArray):
package com.example.buymaskapp;
public class getMaskInfo {
OkHttpClient client = new OkHttpClient();
public static Context mContext;
public getMaskInfo(Context context){
mContext = context;
}
public void requestGet(double lat, double lng){
String url = "https://8oi9s0nnth.apigw.ntruss.com/corona19-masks/v1/storesByGeo/json";
HttpUrl.Builder urlBuilder = HttpUrl.parse(url).newBuilder();
urlBuilder.addEncodedQueryParameter("lat", Double.toString(lat));
urlBuilder.addEncodedQueryParameter("lng", Double.toString(lng));
urlBuilder.addEncodedQueryParameter("m", "1000");
String requestUrl = urlBuilder.build().toString();
Request request = new Request.Builder().url(requestUrl).build();
client.newCall(request).enqueue(new Callback() {
#Override
public void onFailure(Call call, IOException e) {
Log.d("error", "Connect Server Error is " + e.toString());
}
#Override
public void onResponse(Call call, Response response) throws IOException {
try{
JSONObject jsonObject = new JSONObject(response.body().string());
JSONArray totalStore = jsonObject.getJSONArray("stores");
System.out.println(jsonObject);
}catch (JSONException e){
//
}
}
});
}
}
Instead of returning void from requestGet() method, return a LiveData
public LiveData<JSONObject> requestGet(double lat, double lng) {
LiveData<JSONObject> result = MutableLiveData<JSONObject>();
/* reqeust builder & url builder code here */
client.newCall(request).enqueue(new Callback() {
/* override other methods here */
public void onResponse(Call call, Response response) throws IOException {
try{
JSONObject jsonObject = new JSONObject(response.body().string());
((MutableLiveData) result).postValue(jsonObject);
}catch (JSONException e){
/* catch and do something */
}
}
});
return result;
}
Observe the livedata in mainactivity
info.requestGet(latitude, longitude).observe(getViewLifeCycleOwner, new Observer() {
#Override
public void onCanged(JSONObject result) {
/* code to use result */
}
});
Otherwise, you can also implement interface on mainactivity and use its instance in getMaskInfo or in requestGet method to send back data.
Create a callback in MainActivity:
public void onResult(JSONArray stores)
or whatever you want to return from the call. Since you now know that your mContext is actually MainActivity, you can make a cast and call that method
((MainActivity)mContext).onResult(totalStore).
If you need to use getMaskInfo with other activities as well, you can put method onResult into an interface, make MainActivity implement that interface and pass the interface as an argument to getMaskInfo.
Interface class
public interface GetLastIdCallback {
void lastId(String id);
void getJSONCallback(JSONObject object);
}
Update the onResponse function
#Override
public void onResponse(Call call, Response response) throws IOException {
try{
JSONObject jsonObject = new JSONObject(response.body().string());
JSONArray totalStore = jsonObject.getJSONArray("stores");
System.out.println(jsonObject);
((GetLastIdCallback )(mContext)).getJSONCallback(jsonObject); //Return here
}catch (JSONException e){
//
}
}
});
Calling activity must implement GetLastIdCallback interface
public class Main2Activity extends AppCompatActivity implements GetLastIdCallback{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}
#Override
public void lastId(String id) {
}
#Override
public void getJSONCallback(JSONObject object) {
//Here you can use response according to your requirements
}
}
i am new to Android,here is class Question bank returns list of json obj received from an api
ArrayAsyncResponse in interface containing only one method process complete ,i readed that http request is asynchronous but unable to relate
Question is model class
case 1) when there is no ArrayAsyncResponse interface exist and i return the list to main activity and print it it shows empty list but when i make call to callback.processComplete() and then return list followed by printing ,it shows data
case2 )if i pass null in this function callback.processComplete() then again returned list is empty
so what basically Interface is helping us
public class QuestionBank {
ArrayList questionArrayList = new ArrayList<>();
private String url = "https://raw.githubusercontent.com/curiousily/simple-quiz/master/script/statements-data.json";
public List<Question> getQuestions(final AnswerListAsyncResponse callBack) {
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(
Request.Method.GET,
url,
(JSONArray) null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
for (int i = 0; i < response.length(); i++) {
try {
Question question = new Question();
question.setAnswer(response.getJSONArray(i).get(0).toString());
question.setAnswerTrue(response.getJSONArray(i).getBoolean(1));
//Add question objects to list
questionArrayList.add(question);
//Log.d("Hello", "onResponse: " + question.getAnswer());
// Log.d("JSON", "onResponse: " + response.getJSONArray(i).get(0));
//Log.d("JSON2", "onResponse: " + response.getJSONArray(i).getBoolean(1));
} catch (JSONException e) {
e.printStackTrace();
}
}
if (null != callBack) callBack.processFinished(questionArrayList);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
AppController.getInstance().addToRequestQueue(jsonArrayRequest);
return questionArrayList;
}
public class MainActivity extends AppCompatActivity {
private QuestionBank questionBank;
List<Question> questionList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
questionBank=new QuestionBank();
questionList=questionBank.getQuestions(new AnswerListAsyncResponse() {
#Override
public void processFinished(ArrayList<Question> questionsArrayList) {//this function triggers when response is received from api
Log.d("inside", "processFinished: "+questionsArrayList);
}
});
Log.d("sync response", "questionLIst: "+questionList);
}
}
Sorry I can't write this in comment, but I think I can help you.
I don't understand well your question. but I think you need to get a Listener of the async in your class activity.
You can do that with EventBus, like this : https://github.com/greenrobot/EventBus
I am using Retrofit in my application and receiving data from my server.
I receive data from my server in responseBody in Retrofit, but when I want to use these received data, my array is null?!!
Here is my class:
public class ActivityApplicationsList extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_applications_list);
Log.i(TAG , "size of response array: " + populateDataFromServer().size())
//this size is 0 but have to be 4 !
}
private ArrayList<StructApplication> populateDataFromServer() {
final ArrayList<StructApplication> mine = new ArrayList<>();
final APIService service = ServiceGenerator.createService(APIService.class, "2015-03-01 14:26:00", "123456", "123456");
Call<ArrayList<AppModel>> call = service.getApp();
call.enqueue(new Callback<ArrayList<AppModel>>() {
#Override
public void onResponse(Call<ArrayList<AppModel>> call, Response<ArrayList<AppModel>> response) {
ArrayList<AppModel> newAppModel = response.body();
for(int i=0 ; i < newAppModel.size();i++){
StructApplication structApplication = new StructApplication();
structApplication.setName(String.valueOf(newAppModel.get(i).getAppId()));
structApplication.setId(newAppModel.get(i).getAppId());
structApplication.setAppVersionReleaseDate(newAppModel.get(i).getAppVersionReDate());
structApplication.setAppDeleted(newAppModel.get(i).getAppDeleted());
mine.add(structApplication);
}
}
#Override
public void onFailure(Call<ArrayList<AppModel>> call, Throwable t) {
}
});
return mine;
}
}
And I debugged to make sure that all data received in onResponse:
As you can see, I received all data correctly, but when I use this response in onCreate of this class it's null!
I really appreciate your answer about this weird problem.
This is because you are printing your list size before the response comes. As request is being sent asynchronously, and your are trying to get size before onResponse() callback method.
try to add this line
Log.i(TAG , "size of response array: " + populateDataFromServer().size())
in onResponse() method after mine.add(structApplication); you will see the right size.
Its return first and execute later, try this way...
private ArrayList<StructApplication> populateDataFromServer() {
final ArrayList<StructApplication> mine = new ArrayList<>();
final APIService service = ServiceGenerator.createService(APIService.class, "2015-03-01 14:26:00", "123456", "123456");
Call<ArrayList<AppModel>> call = service.getApp();
Response<ArrayList<AppModel>> response = responseCall.execute();
ArrayList<AppModel> newAppModel = response.body();
for(int i=0 ; i < newAppModel.size();i++){
StructApplication structApplication = new StructApplication();
structApplication.setName(String.valueOf(newAppModel.get(i).getAppId()));
structApplication.setId(newAppModel.get(i).getAppId());
structApplication.setAppVersionReleaseDate(newAppModel.get(i).getAppVersionReDate());
structApplication.setAppDeleted(newAppModel.get(i).getAppDeleted());
mine.add(structApplication);
}
return mine;
}
It is happening due to api calling because api taking few seconds to get response and meanwhile you returned your mine array. So please return response once you got value from server.
Do like this
Make a global instance for this class like
public class ActivityApplicationsList extends Activity {
ArrayList<StructApplication> mine = new ArrayList();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_applications_list);
populateDataFromServer();
Log.i(TAG , "size of response array: " + mine.size());
}
private void populateDataFromServer() {
final APIService service = ServiceGenerator.createService(APIService.class, "2015-03-01 14:26:00", "123456", "123456");
Call<ArrayList<AppModel>> call = service.getApp();
call.enqueue(new Callback<ArrayList<AppModel>>() {
#Override
public void onResponse(Call<ArrayList<AppModel>> call, Response<ArrayList<AppModel>> response) {
ArrayList<AppModel> newAppModel = response.body();
for(int i=0 ; i < newAppModel.size();i++){
StructApplication structApplication = new StructApplication();
structApplication.setName(String.valueOf(newAppModel.get(i).getAppId()));
structApplication.setId(newAppModel.get(i).getAppId());
structApplication.setAppVersionReleaseDate(newAppModel.get(i).getAppVersionReDate());
structApplication.setAppDeleted(newAppModel.get(i).getAppDeleted());
mine.add(structApplication);
}
}
#Override
public void onFailure(Call<ArrayList<AppModel>> call, Throwable t) {
}
});
}
}
You need to get the response after the request. See code comments
public class ActivityApplicationsList extends Activity
implements Callback<ArrayList<AppModel>> { // Implement callback here
// These are final, so make them fields
final ArrayList<StructApplication> mine = new ArrayList<>();
final APIService service = ServiceGenerator.createService(APIService.class, "2015-03-01 14:26:00", "123456", "123456");
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_applications_list);
populateDataFromServer();
}
// Callback implementation
#Override
public void onResponse(Call<ArrayList<AppModel>> call, Response<ArrayList<AppModel>> response) {
final ArrayList<AppModel> responseBody = response.body();
for(AppModel model : responseBody){
StructApplication structApplication = new StructApplication();
structApplication.setName(String.valueOf(model.getAppId()));
structApplication.setId(model.getAppId());
structApplication.setAppVersionReleaseDate(model.getAppVersionReDate());
structApplication.setAppDeleted(model.getAppDeleted());
mine.add(structApplication);
}
// adapter.notifyDataSetChanged(); // Need this if using ListView
Log.d("SIZE", ""+mine.size()); // Correct size
}
#Override
public void onFailure(Call<ArrayList<AppModel>> call, Throwable t) {
// error
}
private void populateDataFromServer() { // this is void; it can't return
service.getApp().enqueue(ActivityApplicationsList.this);
}
Suggestion, make this constructor
public class StructApplication {
public StructApplication(AppModel model) {
setName(String.valueOf(model.getAppId());
setId(model.getAppId());
setAppDeleted(model.getAppDeleted());
setAppVersionReleaseDate(model.getAppVersionReDate());
}
}
Then, that loop can simply be
mine.add(new StructApplication(model));
Im trying to populate my listView with data from my database. i have tbl_table with only tableID and tableCapacity. i tried running my phpcodes to postman, and in the printing in the log too, and it seems that there is no problem, so i figured that it must be because of the way i convert the Json encode. i keep on getting this error. thanks in advance.. im running my codes in android 4.1.2 API 16.
FATAL EXCEPTION: main
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.Gson.fromJson(Gson.java:815)
at com.google.gson.Gson.fromJson(Gson.java:768)
at com.google.gson.Gson.fromJson(Gson.java:717)
at com.kosalgeek.android.json.JsonConverter.toArrayList(JsonConverter.java:42)
at markjon.nobleza.qaldi.Table.onResponse(Table.java:51)
at markjon.nobleza.qaldi.Table.onResponse(Table.java:20)
Here is my Codes:
Table.class
public class Table extends AppCompatActivity implements Response.Listener<String> {
final String TAG = this.getClass().getSimpleName();
ListView tableLV;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_table);
String URL = "http://192.168.1.10/myDB/table.php";
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL, this, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "Error retrieving data", Toast.LENGTH_SHORT).show();
}
});
MySingleton.getInstance(getApplicationContext()).addToRequestQueue(stringRequest);
tableLV = (ListView)findViewById(R.id.tableList);
}
#Override
public void onResponse(String response) {
Log.d(TAG, response);
ArrayList<myTable> tableList = new JsonConverter<myTable>().toArrayList(response, myTable.class);
BindDictionary<myTable> dict = new BindDictionary<>();
dict.addStringField(R.id.tableNum, new StringExtractor<myTable>() {
#Override
public String getStringValue(myTable item, int position) {
return "" + item.tableID;
}
});
dict.addStringField(R.id.tableCap, new StringExtractor<myTable>() {
#Override
public String getStringValue(myTable item, int position) {
return "" + item.tableCapacity;
}
});
FunDapter<myTable> adapter = new FunDapter<>(getApplicationContext(), tableList, R.layout.table_layout, dict);
tableLV.setAdapter(adapter);
}
}
myTable.class
public class myTable {
#SerializedName("tableID")
public int tableID;
#SerializedName("tableCapacity")
public int tableCapacity;
}
The error point on these two lines:
public class Table extends AppCompatActivity implements Response.Listener<String>
ArrayList<myTable> tableList = new JsonConverter<myTable>().toArrayList(response, myTable.class);
The response variable should be a proper json string, but it has not the right format. According to the error message and as it is expected to be a json array, this json string should start with array symbol, i.e. [ and ends with ].
I suggest that you use a break point on this line and evaluate the value of response variable. You can use online json formatters/validators to find out what is wrong in this json string. Then you should change the logic of the method that creates this json.
Let's say I have this Dashboard.java:
public class DashboardActivity extends ActionBarActivity {
private TextView login_response;
private static String TAG = DashboardActivity.class.getSimpleName();
final static String API_URL_ACCOUNT = "http://www.example.com/apiv2/account";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
login_response = (TextView) findViewById(R.id.login_response);
Intent intent = getIntent();
if(intent.hasExtra("TOKEN"))
{
String token = intent.getStringExtra("TOKEN");
getShopName(token);
}
else
{
}
And this is the getShopName method:
private void getShopName(String token) {
JsonObjectRequest req = new JsonObjectRequest(API_URL_ACCOUNT + "?token=" + token, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
VolleyLog.v("Response:%n %s", response.toString(4));
JSONArray account = response.getJSONArray("account");
//Log.d(TAG, "Account: "+account.toString());
JSONObject shop = account.getJSONObject(0);
String name_shop = shop.getString("name_shop");
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.e("Error: ", error.getMessage());
}
});
// add the request object to the queue to be executed
VolleyController.getInstance().addToRequestQueue(req);
}
My goal is to have
if(intent.hasExtra("TOKEN"))
{
String token = intent.getStringExtra("TOKEN");
String shop_name = getShopName(token);
}
The "shop_name" in variable, to reuse in other part.
So, I know that void doesn't return nothing, but, I tried to edit like this answer, without success:
How can I return value from function onResponse of Volley?
Thank you
The issue is not returning a value from a JsonObjectRequest, but rather that you're trying to do an asynchronous operation in a synchronous way.
Here is a great explanation: Asynchronous vs synchronous execution, what does it really mean?
And to your specific question: I advise using an AsyncTask for your network operation.