Argthtjtr

I'm a beginner android developer I want to catch JSON array response like id,uid etc. Please help me to do this I took many help from YouTube but there is no solution. I'm stuck with it. I am giving all the files I have created for this and also the JSON.

JSON file

{

      "status": 0,

      "response_data": [

        {

          "id": "12",

          "uid": "USER00000003",

          "reason": "Test",

          "type": "Plan Leave",

          "SataDate": "2018-09-18",

          "EndDate": "2018-09-25",

          "ApprovedBy": "USER00000002",

          "ApprovedDate": "2018-09-18",

          "Status": "REJECTED",

          "Remarks": "Test Reject"

        },

        {

          "id": "13",

          "uid": "USER00000003",

          "reason": "Wedding",

          "type": "Plan Leave",

          "SataDate": "2018-01-28",

          "EndDate": "2018-02-05",

          "ApprovedBy": "USER00000002",

          "ApprovedDate": "2018-09-18",

          "Status": "APPROVED",

          "Remarks": "Ok"

        }

      ]

    }

ApiInterface

public interface ApiInterface {



    @GET("leave_dtls.php")

    Call<ResponseData> getData();

}

ApiClient

public class ApiClient {

    private final static String BASE_URL = "http://api.xxxx.com/app/";

    public static ApiClient apiClient;

    private Retrofit retrofit = null;



    public static ApiClient getInstance() {

        if (apiClient == null) {

            apiClient = new ApiClient();

        }

        return apiClient;

    }



//private static Retrofit storeRetrofit = null;



    public Retrofit getClient() {

        return getClient(null);

    }







    private Retrofit getClient(final Context context) {



        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();

        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

        OkHttpClient.Builder client = new OkHttpClient.Builder();

        client.readTimeout(60, TimeUnit.SECONDS);

        client.writeTimeout(60, TimeUnit.SECONDS);

        client.connectTimeout(60, TimeUnit.SECONDS);

        client.addInterceptor(interceptor);

        client.addInterceptor(new Interceptor() {

            @Override

            public okhttp3.Response intercept(Chain chain) throws IOException {

                Request request = chain.request();



                return chain.proceed(request);

            }

        });



        retrofit = new Retrofit.Builder()

                .baseUrl(BASE_URL)

                .client(client.build())

                .addConverterFactory(GsonConverterFactory.create())

                .build();





        return retrofit;

    }



}

Response Data

public class ResponseData {

    @SerializedName("response_data")

    private List<ResponseDataItem> responseData;



    @SerializedName("status")

    private int status;



    public void setResponseData(List<ResponseDataItem> responseData){

        this.responseData = responseData;

    }



    public List<ResponseDataItem> getResponseData(){

        return responseData;

    }



    public void setStatus(int status){

        this.status = status;

    }



    public int getStatus(){

        return status;

    }

}

ResponseDataItem

public class ResponseDataItem {





    @SerializedName("Status")

    private String status;



    @SerializedName("uid")

    private String uid;



    @SerializedName("reason")

    private String reason;



    @SerializedName("ApprovedDate")

    private String approvedDate;



    @SerializedName("Remarks")

    private String remarks;



    @SerializedName("ApprovedBy")

    private String approvedBy;



    @SerializedName("id")

    private String id;



    @SerializedName("type")

    private String type;



    @SerializedName("EndDate")

    private String endDate;



    @SerializedName("SataDate")

    private String sataDate;



    public String getStatus() {

        return status;

    }



    public void setStatus(String status) {

        this.status = status;

    }



    public String getUid() {

        return uid;

    }



    public void setUid(String uid) {

        this.uid = uid;

    }



    public String getReason() {

        return reason;

    }



    public void setReason(String reason) {

        this.reason = reason;

    }



    public String getApprovedDate() {

        return approvedDate;

    }



    public void setApprovedDate(String approvedDate) {

        this.approvedDate = approvedDate;

    }



    public String getRemarks() {

        return remarks;

    }



    public void setRemarks(String remarks) {

        this.remarks = remarks;

    }



    public String getApprovedBy() {

        return approvedBy;

    }



    public void setApprovedBy(String approvedBy) {

        this.approvedBy = approvedBy;

    }



    public String getId() {

        return id;

    }



    public void setId(String id) {

        this.id = id;

    }



    public String getType() {

        return type;

    }



    public void setType(String type) {

        this.type = type;

    }



    public String getEndDate() {

        return endDate;

    }



    public void setEndDate(String endDate) {

        this.endDate = endDate;

    }



    public String getSataDate() {

        return sataDate;

    }



    public void setSataDate(String sataDate) {

        this.sataDate = sataDate;

    }



}

MainActivity

public class MainActivity extends AppCompatActivity {



    TextView tvResponse;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        tvResponse=findViewById(R.id.tvResponse);



        ApiInterface apiInterface = ApiClient.getInstance().getClient().create(ApiInterface.class);

        Call<ResponseData> responseDataCall=apiInterface.getData();

        responseDataCall.enqueue(new Callback<ResponseData>() {

            @Override

            public void onResponse(Call<ResponseData> call, Response<ResponseData> response) {

                if (response.isSuccessful() && response.body()!=null && response!=null){

                    List<ResponseDataItem> data=response.body().getResponseData();



                }

            }



            @Override

            public void onFailure(Call<ResponseData> call, Throwable t) {

                t.printStackTrace();

            }

        });

    }

}

just I want to show the response in TEXTVIEW.

ApiInterface apiInterface = 

ApiClient.getInstance().getClient().create(ApiInterface.class);

    Call<ResponseData> responseDataCall=apiInterface.getData();

    responseDataCall.enqueue(new Callback<ResponseData>() {

        @Override

        public void onResponse(Call<ResponseData> call, Response<ResponseData> response) {

            if (response.isSuccessful() && response.body()!=null && response!=null){

                List<ResponseDataItem> data=response.body().getResponseData();

                tvResponse.setText(response.body().getResponseData().toString());

            }

        }



        @Override

        public void onFailure(Call<ResponseData> call, Throwable t) {

            t.printStackTrace();

        }

    });

just add this line for showing data in textview,
as per your current question, if your question is different then kindly elaborate more

Problem is that you pass null value in getClient() method.You not getting your client.
Use below code :

public static Retrofit getClient() {

    HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();

    httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

    OkHttpClient.Builder builder = new OkHttpClient.Builder();

    builder.networkInterceptors().add(httpLoggingInterceptor);

    builder.interceptors().add(httpLoggingInterceptor);

    okHttpClient = builder.build();

    retrofit = new Retrofit.Builder().baseUrl(BASE_URL)

            .addConverterFactory(GsonConverterFactory.create())

            .client(okHttpClient)

            .build();



    return retrofit;

}

 // then call **getClient()** like below:





ApiInterface apiInterface = ApiClient.getInstance().getClient().create(ApiInterface.class);

    Call<ResponseData> responseDataCall=apiInterface.getData();

    responseDataCall.enqueue(new Callback<ResponseData>() {

        @Override

        public void onResponse(Call<ResponseData> call, Response<ResponseData> response) {

            if (response.isSuccessful() && response.body()!=null && response!=null){

                List<ResponseDataItem> data=response.body().getResponseData();



            }

        }



        @Override

        public void onFailure(Call<ResponseData> call, Throwable t) {

            t.printStackTrace();

        }

    });

tvResponse.setText("show some text");

in your example you could also use append if there's more than one item to show. put this in your method onResponse:

    List<ResponseDataItem> data=response.body().getResponseData();

    for (ResponseDataItem responseItem : data) {

        tvResponse.append(responseItem.getId() + "n");

        tvResponse.append(responseItem.getUId() + "n");

        // append any other fields you want to show

    }

First of all, you are not passing Context while creating ApiInterface object. That's why your object will not be created properly. You should pass Context as i'm doing.

Secondly, You have Call<ResponseData> in your ApiInterface and here you're trying to fetch response in a List<>. so you should get response body in Model Class object.

Update your code with this.

String data = "";

ApiInterface apiInterface = ApiClient.getInstance().getClient(MainActivity.this).create(ApiInterface.class);

Call<ResponseData> responseDataCall=apiInterface.getData();

        responseDataCall.enqueue(new Callback<ResponseData>() {

            @Override

            public void onResponse(Call<ResponseData> call, Response<ResponseData> response) {

                if (response.isSuccessful() && response.body()!=null && response!=null){

                  ResponseData data = response.body();

                  for(int i=0; i< data.getResponseData().size(); i++){

                  String id = data.getResponseData().getId();

                  String uid = data.getResponseData().getUid();

                  //Similarly you can get others



                  data = data + "Id= "+ id +", uId= "+ uid + "n";

                 }

                  //setdetails to TextView 

                  tvResponse.setText(data);

                }

            }



            @Override

            public void onFailure(Call<ResponseData> call, Throwable t) {

                t.printStackTrace();

            }

        });

Hope this helps you !