Retrofit Android-Fetching Data With Retrofit-teachmeandroidhub

Teachmeandroidhub

            Retrofit Android:-This Tutorial is Develop to describe how to get or fetch data from server with Retrofit in Retrofit is latest Restful Api that  make data accessibility more easy and fast Earlier i i have discussed about post data using retrofit let's see how can be fetching data with Retrofit achieved in Retrofit android topic so let's start step by step and it;s 100% working


Step-1 : Create  a Project  Define MainActivity as you want like this. This is may be your main activity in my Activity name is as following first You just Create

at first You Create Layouts For this :

activity_getusing.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:shimmer="http://schemas.android.com/apk/res-auto"
    tools:context="com.example.rajeev.getandpostusingratrofit.GetUsingActivity">
    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:paddingBottom="0dp"
        android:divider="#faf8f8"
        android:dividerHeight="2dp"
        android:layout_alignParentStart="true"
        />
</android.support.constraint.ConstraintLayout>

Now create list of like below 

patientlist.java

package com.example.rajeev.getandpostusingratrofit;

import com.google.gson.annotations.SerializedName;

import java.util.ArrayList;

/**
 * Created by RAJEEV on 03-Aug-18.
 */

public class Patientlist {
    @SerializedName("patients")
    private ArrayList<PatientModel> patient=new ArrayList<>();

    public ArrayList<PatientModel> getPatientArrayList() {
        return patient;
    }

    public void setPatient(ArrayList<PatientModel> patient) {
        this.patient = patient;
    }
}



patientlist.xml

<?xml version="1.0" encoding="utf-8"?>
	<android.support.design.widget.CoordinatorLayout
	xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
	android:layout_height="match_parent"
	>
	<LinearLayout
	android:layout_width="match_parent"
	android:layout_height="290dp"
	android:background="#890c0c"
	android:orientation="vertical">
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/ids"
	android:text="id"
	android:textColor="#FFFFFF"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/name"
	android:textColor="#FFFFFF"
	android:text="name"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/blg"
	android:textColor="#FFFFFF"
	android:text="Blood group"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/contact"
	android:textColor="#FFFFFF"
	android:text="contact number"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/address"
	android:text="address"
	android:textColor="#FFFFFF"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/donar"
	android:text="donar"
	android:textColor="#FFFFFF"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/city"
	android:text="city"
	android:textColor="#FFFFFF"
	android:textSize="25dp"/>
	<TextView
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:id="@+id/time"
	android:text="time"
	android:textColor="#FFFFFF"
	android:textSize="25dp"/>
	</LinearLayout>
	</android.support.design.widget.CoordinatorLayout>

Before Start any other work first of  all you need to  create a interface name may be difference but in my case after creating this follow step below to fetch data using Retrofit in android  so let do this fun

 Service.java

public interface Service {
    String BASE1_URL = "http://ramgopalabs.000webhostapp.com/";  //first half of link
    @GET("v1/EmergencyRequirement.php/?op=getPatient") //secondhalf of link
    Call<Patientlist> getstatus();

}

This class is Used  to call api using retrofit it's contain link

GetUsingActivity.java

public class GetUsingActivity extends AppCompatActivity {
    List<PatientModel> patientlst;
    ListView listView;
    FetchAdapter adapter;
    ShimmerFrameLayout shimmerFrameLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_get_using);
        shimmerFrameLayout=findViewById(R.id.shimmer_view_container);
        listView=(ListView)findViewById(R.id.listview);
        patientlst=new ArrayList<>();
        loaddata();
    }

    private void loaddata() {
        shimmerFrameLayout.startShimmerAnimation();
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Service.BASE1_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        final Service api = retrofit.create(Service.class);
        Call<Patientlist>  call=api.getstatus();
        call.enqueue(new Callback<Patientlist>() {
            @Override
            public void onResponse(Call<Patientlist> call, Response<Patientlist> response) {
                if (response.isSuccessful()){
                    patientlst=response.body().getPatientArrayList();
                    adapter=new FetchAdapter(GetUsingActivity.this,R.layout.patientlist,patientlst);
                    listView.setAdapter(adapter);
                }
                shimmerFrameLayout.stopShimmerAnimation();
                shimmerFrameLayout.setVisibility(View.GONE);
            }

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

            }
        });

    }

    @Override
    protected void onResume() {
        super.onResume();
        shimmerFrameLayout.startShimmerAnimation();
    }

    @Override
    protected void onPause() {
        super.onPause();
        shimmerFrameLayout.stopShimmerAnimation();
    }
}

in This class all main fundamental are regarding fetch but some of  the work is rest works to do is as following :-

now Create  Adapter Class to get and set data

FetchAdapter.java

public class FetchAdapter extends ArrayAdapter{
    Context context;
    LayoutInflater inflater;
    int resource;
    List<PatientModel>list;
    public FetchAdapter(@NonNull Context context, int resource,List<PatientModel>list) {
        super(context, resource,list);

        this.context = context;
        this.resource = resource;
        this.list = list;
        inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        ViewHolder holder;

        if(convertView == null){

            convertView = inflater.inflate(resource,null);

            holder = new ViewHolder();
            holder.id = (TextView)convertView.findViewById(R.id.ids);
            holder.bloodgroup=(TextView)convertView.findViewById(R.id.blg);
            holder.address=(TextView)convertView.findViewById(R.id.address);
            holder.city=(TextView)convertView.findViewById(R.id.city);
            holder.name=(TextView)convertView.findViewById(R.id.name);
            holder.contact=(TextView)convertView.findViewById(R.id.contact);
            holder.time=(TextView)convertView.findViewById(R.id.time);
            holder.donar=(TextView)convertView.findViewById(R.id.donar);

            convertView.setTag(holder);


        }else{
            holder = (ViewHolder)convertView.getTag();
        }

        PatientModel model = list.get(position);
        holder.id.setText("Id: "+model.getId());
        holder.name.setText("Patient Name: "+model.getName());
        holder.bloodgroup.setText("blood group: "+model.getBloodgroup());
        holder.address.setText("Address: "+model.getAdress());
        holder.city.setText("City: "+model.getCity());
        holder.contact.setText("Contact: "+model.getContact());
        holder.time.setText("Time: "+model.getTime());
        holder.donar.setText("Donar Name: "+model.getDonar());

        return convertView;
    }

    static class ViewHolder{
        TextView id,name,bloodgroup,city,contact,address,time,donar;
    }

}


Now it's time to create  model class Below is  the way to create

PatientModel.java

public class PatientModel {
    @SerializedName("Id")
    @Expose
    private String  id;
    @SerializedName("BloodGroup")
    @Expose
    private String bloodgroup;
    @SerializedName("Address")
    @Expose
    private String adress;
    @SerializedName("City")
    @Expose
    private  String city;
    @SerializedName("PatientName")
    @Expose
    private String name;
    @SerializedName("ContactNumber")
    @Expose
    private String contact;
    @SerializedName("Time")
    @Expose
    private String time;
    @SerializedName("DonatedBy")
    @Expose
    private  String donar;

    public PatientModel(String id, String bloodgroup, String adress, String city, String name, String contact, String time, String donar) {
        this.id = id;
        this.bloodgroup = bloodgroup;
        this.adress = adress;
        this.city = city;
        this.name = name;
        this.contact = contact;
        this.time = time;
        this.donar = donar;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getBloodgroup() {
        return bloodgroup;
    }

    public void setBloodgroup(String bloodgroup) {
        this.bloodgroup = bloodgroup;
    }

    public String getAdress() {
        return adress;
    }

    public void setAdress(String adress) {
        this.adress = adress;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getContact() {
        return contact;
    }

    public void setContact(String contact) {
        this.contact = contact;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getDonar() {
        return donar;
    }

    public void setDonar(String donar) {
        this.donar = donar;
    }

}


SourceCode ClickHere