How to parse json data with retrofit on Android

Question

ill try to be specific here. So i have created the most basic possible code just to test it and i am still unable to get the data, please help! Here is my code :

this is json output on my local server : http://localhost:8080/KokosinjacRestfull/rest/textService/mudriPevci

[{"id":1,"subCategory":"MudriPevci","title":"Mujo i haso","description":"Krenuli do Grada","author":"luka","date":"2016-06-13"},{"id":3,"subCategory":"mudriPevci","title":"Perica","description":"Pa on je napravio Haos","author":"luka","date":"2016-06-13"}]

Text.class :

package kokosinjac.com.digiart.koktest.models;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;


public class Text {

@SerializedName("id")
@Expose
private Integer id;
@SerializedName("subCategory")
@Expose
private String subCategory;
@SerializedName("title")
@Expose
private String title;
@SerializedName("description")
@Expose
private String description;
@SerializedName("author")
@Expose
private String author;
@SerializedName("date")
@Expose
private String date;

/**
 * No args constructor for use in serialization
 *
 */


/**
 *
 * @param id
 * @param author
 * @param title
 * @param subCategory
 * @param description
 * @param date
 */


/**
 *
 * @return
 * The id
 */
public Integer getId() {
    return id;
}

/**
 *
 * @param id
 * The id
 */
public void setId(Integer id) {
    this.id = id;
}

/**
 *
 * @return
 * The subCategory
 */
public String getSubCategory() {
    return subCategory;
}

/**
 *
 * @param subCategory
 * The subCategory
 */
public void setSubCategory(String subCategory) {
    this.subCategory = subCategory;
}

/**
 *
 * @return
 * The title
 */
public String getTitle() {
    return title;
}

/**
 *
 * @param title
 * The title
 */
public void setTitle(String title) {
    this.title = title;
}

/**
 *
 * @return
 * The description
 */
public String getDescription() {
    return description;
}

/**
 *
 * @param description
 * The description
 */
public void setDescription(String description) {
    this.description = description;
}

/**
 *
 * @return
 * The author
 */
public String getAuthor() {
    return author;
}

/**
 *
 * @param author
 * The author
 */
public void setAuthor(String author) {
    this.author = author;
}

/**
 *
 * @return
 * The date
 */
public String getDate() {
    return date;
}

/**
 *
 * @param date
 * The date
 */
public void setDate(String date) {
    this.date = date;
}

}

Api interface.class :

package kokosinjac.com.digiart.koktest.retrofit;

import java.util.ArrayList;

import kokosinjac.com.digiart.koktest.models.Text; import retrofit2.Call; import retrofit2.http.GET; import retrofit2.http.Path;

public interface RetrofitAPInterface {
@GET("rest/textService/{subCategory}")
Call<ArrayList<Text>> getText(@Path("subCategory") String subCat);
}

class that displays data on the phone (you do not need to pay attention on some Strings, just look at the retrofit part,i;ve made it as simple as i can, subCatData.class:

public static final String BASE_URL ="http://localhost:8080/KokosinjacRestfull/";
HashMap<String,String> dataArr;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_sub_cat_data);
    final TextView tView = (TextView) findViewById(R.id.textView);
    Intent intent = getIntent();
    String urlSecondPartBefore = intent.getStringExtra("passedSubCat");
    String urlSecondPartAfter = urlSecondPartBefore.replaceAll("\\s", "");
    String urlFirstPart = intent.getStringExtra("passedUrlFirstPart");
    String catName = intent.getStringExtra("passedCatName");
    String data = null;
   // TextView test = (TextView) findViewById(R.id.test);


    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    RetrofitAPInterface apiService = retrofit.create(RetrofitAPInterface.class);
    Call<ArrayList<Text>> call = apiService.getText("mudriPevci");
    call.enqueue(new Callback<ArrayList<Text>>() {
        @Override
        public void onResponse(Call<ArrayList<Text>> call, Response<ArrayList<Text>> response) {
            int statusCode = response.code();
            ArrayList<Text> textArray = response.body();
            for (Text t : textArray){
                tView.setText(t.getDescription());
            }
          //  Log.i("DATA", "onResponse: "+text.getId());
        }

        @Override
        public void onFailure(Call<ArrayList<Text>> call, Throwable t) {

        }
    });

}

}

I am aware that the whole bunch of data is going to a simple label , but it is for testing purposes. Still i can not retrieve anything and i do not get any errors as well. Help would be much appreciated. Thanks!

this solution may help you please check it out stackoverflow.com/questions/33338923/… — Ajay Venugopal
– Ajay Venugopal, Commented Jul 25, 2016 at 12:28

Uttam Panchasara · Accepted Answer · 2016-07-25 12:24:56Z

1

I think problem with your URL if you are testing your App with android emulator then try like "http://10.0.2.2:8080/" . but if you are testing with device then you need to pass Your machine IP address like "http://192.143.1.0/". and make sure that your device is connected with your machine on which your database is exits.

edited Jul 25, 2016 at 12:24

answered Jul 25, 2016 at 6:44

Uttam Panchasara

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3 Comments

vibetribe93 Over a year ago

I am aware of that issue and for that reason i am testing with my emulator. Does the code look ok?

Uttam Panchasara Over a year ago

yess your code looks like ok but because you are using localhost in your URL may be problem with it try to put "http://10.0.2.2:8080/" instead localhost.

vibetribe93 Over a year ago

Thanks sir, it works! i tried testing it directly in the browser but it does not work there, only in android studio. Thanks for the help!!

Ethan · Accepted Answer · 2016-07-25 00:17:21Z

0

To parse JSON data on Android I highly recommend using JSOUP which you can find by clicking here it is simple, straight forward, and user friendly. Very easy to learn. Hope this helps you!

answered Jul 25, 2016 at 0:17

Ethan

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1 Comment

vibetribe93 Over a year ago

Thank you for your reply, the problem with that is because i will use retrofit later to upload data aswell, so i figure i need a rest like api. Thx

Abhay Tomar · Accepted Answer · 2016-07-25 05:25:42Z

0

The problem might be in your BASE_URL Change your BASE_URL to BASE_URL ="http://<your_local_ip_address>/KokosinjacRestfull/";

answered Jul 25, 2016 at 5:25

Abhay Tomar

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1 Comment

vibetribe93 Over a year ago

I am aware of that issue and for that reason i am testing with my emulator. Does the code look ok?

Ravi · Accepted Answer · 2017-05-16 19:37:23Z

i hope the below example might help

     public void startFetching() {
    mApiManager.getFlowerApi().getFlowers(new Callback<String>() {
        @Override
        public void success(String s, Response response) {
            Log.d(TAG, "JSON :: " + s);

            try {
                JSONArray array = new JSONArray(s);

                for(int i = 0; i < array.length(); i++) {
                    JSONObject object = array.getJSONObject(i);

                    Flower flower = new Flower.Builder()
                            .setCategory(object.getString("category"))
                            .setPrice(object.getDouble("price"))
                            .setInstructions(object.getString("instructions"))
                            .setPhoto(object.getString("photo"))
                            .setName(object.getString("name"))
                            .setProductId(object.getInt("productId"))
                            .build();

                    mListener.onFetchProgress(flower);

                }

            } catch (JSONException e) {
                mListener.onFetchFailed();
            }


            mListener.onFetchComplete();
        }

        @Override
        public void failure(RetrofitError error) {
            Log.d(TAG, "Error :: " + error.getMessage());
            mListener.onFetchComplete();
        }
    });
}

Chandan Bhandari · Accepted Answer · 2017-08-18 06:33:41Z

0

the problem is with your URL Android can't hit your localhost ie http://localhost:8080/KokosinjacRestfull/rest/textService/mudriPevci

up your server in specific IP and the run.The new IP would be like http://192.168.1.1/KokosinjacRestfull/rest/textService/mudriPevci

answered Aug 18, 2017 at 6:33

Chandan Bhandari

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Comments

saurav singh · Accepted Answer · 2020-12-27 15:03:34Z

0

use ip address instead of localhost (replace localhost from url and place your computer's ipaddress for ip address open cmd and type ipconfig and replace localhost).

answered Dec 27, 2020 at 15:03

saurav singh

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