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JSON Parsing with Retrofit in Android Studio.


https://choudhary780.blogspot.com/2017/05/json-parsing-with-retrofit-in-android.html


Json Format:- http://api.androidhive.info/contacts/
{
    "contacts": [
        {
                "id": "c200",
                "name": "Ravi Tamada",
                "email": "ravi@gmail.com",
                "address": "xx-xx-xxxx,x - street, x - country",
                "gender" : "male",
                "phone": {
                    "mobile": "+91 0000000000",
                    "home": "00 000000",
                    "office": "00 000000"
                }
        }
        ]
}

Creating New Project.
Open android studio and create a new project.

File => New => New Project => Configure your new project => Select the form factor yours app will run on => Add an Activity to Mobile => Customize the Activity => Finish.

First we need to add Library to our project.
  compile 'com.google.code.gson:gson:2.6.2'
  compile 'com.squareup.retrofit2:retrofit:2.1.0'
  compile 'com.squareup.retrofit2:converter-gson:2.1.0'
  compile 'com.android.support:recyclerview-v7:25.1.0'
  compile 'com.jakewharton:butterknife:8.4.0'
  compile 'com.squareup.okhttp3:logging-interceptor:3.4.2'
  compile 'com.google.dagger:dagger:2.4'
  compile 'com.squareup.okhttp3:okhttp:3.5.0'

Create Xml file in project.  
Open => app => res => layout - activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="co.apidemos.activity.MainActivity">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/recyclerView"
        android:scrollbars="vertical"
        ></android.support.v7.widget.RecyclerView>
    <TextView
        android:id="@+id/emptyTextView"
        android:layout_width="wrap_content"
        android:text="@string/empty_string"
        android:layout_centerInParent="true"
        android:textSize="30sp"
        android:visibility="gone"
        android:layout_height="wrap_content" />
</RelativeLayout>


Create Xml file in project. 
Open => app => res => layout - list_item.xml.

package co.apidemos.adapter;

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/userLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#fff"
    android:orientation="vertical">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="12dp">

    <TextView
        android:id="@+id/txtName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_vertical_margin"
        android:text="" />

    <TextView
        android:id="@+id/txtAddress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_vertical_margin"
        android:text="" />

    <TextView
        android:id="@+id/txtEmail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_vertical_margin"
        android:text=" " />

    <TextView
    android:id="@+id/txtGender"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="@dimen/activity_vertical_margin"
    android:text="" />



</LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="6dp"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/textPhone"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Mobile: "
            />

        <TextView
            android:id="@+id/txtPhone"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/activity_vertical_margin"
            />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="6dp">

        <TextView
            android:id="@+id/textHome"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Home: "/>

        <TextView
            android:id="@+id/txtHome"
            style="@style/textviewBadge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="6dp">

        <TextView
            android:id="@+id/textOffice"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="office: "/>

        <TextView
            android:id="@+id/txtOffice"
            style="@style/textviewBadge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:layout_marginTop="8dp"
        android:background="#ccc"></View>
</LinearLayout>


Create the Java file in project.
Open app => main => src = MainActivity.java


import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import butterknife.BindView;
import butterknife.ButterKnife;
import co.apidemos.BaseActivity;
import co.apidemos.R;
import co.apidemos.adapter.CustomAdapter;
import co.apidemos.model.flow.ObjectData;
import co.apidemos.model.flow.UserData;
import co.apidemos.rest.APIClient;
import co.apidemos.rest.EndPoints;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * Created by Saify on 5/3/2017.
 **/

public class MainActivity extends BaseActivity {

    @BindView(R.id.emptyTextView)
    TextView emptyTextView;

    @BindView(R.id.recyclerView)
    RecyclerView recyclerView;

    List<UserData> myDataSource = new ArrayList<>();
    RecyclerView.Adapter myAdater;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setTitle(getApplicationContext().getResources().getString(R.string.stackoverflow));
        creatingLayouts();
        ButterKnife.bind(this);

        loadUsers();
    }

    private void loadUsers() {
        EndPoints apiService = APIClient.getStackOverFLowClient().create(EndPoints.class);
        Call<ObjectData> call = apiService.getUsers("");
        showProgressDialog();
        call.enqueue(new Callback<ObjectData>() {
            @Override
            public void onResponse(Call<ObjectData> call, Response<ObjectData> response) {

                List<UserData> users = response.body().getUsers();

                myDataSource.clear();
                myDataSource.addAll(response.body().getUsers());
                myAdater.notifyDataSetChanged();
                hideProgressDialog();
            }

            @Override
            public void onFailure(Call<ObjectData> call, Throwable t) {
                t.printStackTrace();
                emptyTextView.setText(t.toString());

            }
        });
    }

    private void creatingLayouts() {
        setContentView(R.layout.activity_main);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        myAdater = new CustomAdapter(getApplicationContext(), myDataSource, R.layout.list_item);
        recyclerView.setAdapter(myAdater);
    }

}


Create the Java file in project.
Open app => main => src = CustomerAdapter.java

import android.content.Context;
import android.graphics.Typeface;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Iterator;
import java.util.List;
import java.util.Map;

import co.apidemos.R;
import co.apidemos.model.flow.UserData;

/**
 * Created by Saify on 5/3/2017.
 **/


public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.UserViewHolder> {
    private List<UserData> users;
    private Context mcontext;
    private int rowLayout;


    // constructor
    public CustomAdapter(Context mcontext, List<UserData> users, int rowLayout) {
        this.setMcontext(mcontext);
        this.setUsers(users);
        this.setRowLayout(rowLayout);
    }

    public Context getMcontext() {
        return mcontext;
    }

    public void setMcontext(Context mcontext) {
        this.mcontext = mcontext;
    }

    public List<UserData> getUsers() {
        return users;
    }

    public void setUsers(List<UserData> users) {
        this.users = users;
    }

    public int getRowLayout() {
        return rowLayout;
    }

    public void setRowLayout(int rowLayout) {
        this.rowLayout = rowLayout;
    }

    @Override
    public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(rowLayout, parent, false);
        return new UserViewHolder(view);
    }

    @Override
    public void onBindViewHolder(UserViewHolder holder, final int position) {
        holder.userName.setText("NAME: "+users.get(position).getUserName());
        holder.userName.setTypeface(Typeface.DEFAULT_BOLD);
        holder.userAddess.setText("ADDRESS: " + users.get(position).getAddress());
        holder.userEmail.setText("EMAIL:  " + users.get(position).getEmail());
        holder.userGender.setText("Gender: "+users.get(position).getGender());


        Iterator<Map.Entry<String, String>> iterator=users.get(position).getPhone().entrySet().iterator();

        Map.Entry<String, String> pair=iterator.next();
        holder.phone.setText(pair.getKey()+ " : ");
        holder.phoneTextView.setText(pair.getValue());

        pair=iterator.next();
        holder.home.setText(pair.getKey()+ " : ");
        holder.homeTextView.setText(pair.getValue());

        pair=iterator.next();
        holder.office.setText(pair.getKey()+ " : ");
        holder.officeTextView.setText(pair.getValue());



        holder.usersLinearLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(mcontext, " " + users.get(position).getUserName(), Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public int getItemCount() {
        return users.size();
    }


    public static class UserViewHolder extends RecyclerView.ViewHolder {

        LinearLayout usersLinearLayout;
        TextView userName;
        TextView userAddess;
        TextView userEmail;
        TextView userGender;
        TextView phoneTextView;
        TextView phone;
        TextView homeTextView;
        TextView home;
        TextView officeTextView;
        TextView office;


        public UserViewHolder(View itemView) {
            super(itemView);

            usersLinearLayout = (LinearLayout) itemView.findViewById(R.id.userLayout);
            userName = (TextView) itemView.findViewById(R.id.txtName);
            userAddess = (TextView) itemView.findViewById(R.id.txtAddress);
            userEmail = (TextView) itemView.findViewById(R.id.txtEmail);
            userGender = (TextView) itemView.findViewById(R.id.txtGender);
            phoneTextView = (TextView) itemView.findViewById(R.id.txtPhone);
            phone = (TextView) itemView.findViewById(R.id.textPhone);
            homeTextView = (TextView) itemView.findViewById(R.id.txtHome);
            home = (TextView) itemView.findViewById(R.id.textHome);
            officeTextView = (TextView) itemView.findViewById(R.id.txtOffice);
            office = (TextView) itemView.findViewById(R.id.textOffice);

        }
    }
}


//*****In this java file declaring the array list with array name********//

Create the Java file in project.
Open app => main => src = ObjectData.java
import com.google.gson.annotations.SerializedName;
import java.util.List;

/**
 * Created by Saify on 5/3/2017.
 **/

public class ObjectData {
    @SerializedName("contacts")
    private List<UserData> users;

    public  void setUsers(List<UserData> users){this.users=users;}
    public List<UserData> getUsers(){ return users;}
}


//*****set the parameter******//

Create the Java file in project.
Open app => main => src = UserData.java

import com.google.gson.annotations.SerializedName;

import java.util.HashMap;


/**
 * Created by Saify on 5/3/2017.
 **/

public class UserData {

    @SerializedName("address")
    private String address;
    @SerializedName("name")
    private String userName;

    @SerializedName("gender")
    private  String gender;

    @SerializedName("email")
    private String email;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }



    @SerializedName("phone")
    private HashMap<String, String> phone= new HashMap<>();

    public HashMap<String, String> getPhone() {
        return phone;
    }

    public void setPhone(HashMap<String, String> phone) {
        this.phone = phone;
    }

}

//********Set the base url and end point url*****//

Create the Java file in project.
Open app => main => src = APIClient.java

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * Created by Saify on 5/3/2017.
 **/

public class APIClient {

    public static  final  String BASE_URL="http://api.androidhive.info";
    public static Retrofit retrofit=null;
   

    public static  Retrofit getStackOverFLowClient(){
        if(retrofit == null){
            retrofit=new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return  retrofit;
    }
}


Create the Java file in project.
Open app => main => src = EndPoint.java

import co.apidemos.model.flow.ObjectData;
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;

/**
 * Created by Saify on 5/3/2017.
 **/


public interface EndPoints {
    //get the user of stackoverflow
    @GET("/contacts/")
    Call<ObjectData> getUsers(@Query("") String sort);

}


//********Progres Dialog Class******//

Create the Java file in project.
Open app => main => src = BaseActivity.java

import android.app.ProgressDialog;
import android.support.annotation.VisibleForTesting;
import android.support.v7.app.AppCompatActivity;

/**
 * Created by Saify on 5/3/2017.
 **/


public class BaseActivity extends AppCompatActivity {

    @VisibleForTesting
    public ProgressDialog mProgressDialog;

    public void showProgressDialog() {
        if (mProgressDialog == null) {
            mProgressDialog = new ProgressDialog(this);
            mProgressDialog.setMessage(getString(R.string.loading));
            mProgressDialog.setIndeterminate(true);
        }

        mProgressDialog.show();
    }

    public void hideProgressDialog() {
        if (mProgressDialog != null && mProgressDialog.isShowing()) {
            mProgressDialog.dismiss();
        }
    }

    @Override
    public void onStop() {
        super.onStop();
        hideProgressDialog();
    }

}


Add Internet permission in your manifest.
<uses-permission android:name="android.permission.INTERNET" />

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