ListView in android with api and volley Network Library in android Studio.

 

In a previous tutorial, you are learning what is a listview and how to make listview static in Android Studio. 

Now we are learning How to make Dynamic Listview in android  Using Network library and restful API.

In this tutorial, I am using Volley Network Library.

Step 1: make a MainActivity.xml file in the project and add Listview in the file just like this XML code. 

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/container"
    tools:context=".MainActivity">
<ListView
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>
</FrameLayout>

Step 2: we Are Implement dependencies In the android project build.guide file as it is copied and paste it.

implementation 'com.android.volley:volley:1.0.0'

step 3: Now making VolleySingleton class in your project and copies this code and paste as it is.

package com.example.schoolapp;

import android.content.Context;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.toolbox.Volley;


public class VolleySingleton {
    private static VolleySingleton mInstance;
    private RequestQueue mRequestQueue;
    private static Context mCtx;

    private VolleySingleton(Context context) {
        mCtx = context;
        mRequestQueue = getRequestQueue();
    }

    public static synchronized VolleySingleton getInstance(Context context) {
        if (mInstance == null) {
            mInstance = new VolleySingleton(context);
        }
        return mInstance;
    }

    public RequestQueue getRequestQueue() {
        if (mRequestQueue == null) {
            // getApplicationContext() is key, it keeps you from leaking the
            // Activity or BroadcastReceiver if someone passes one in.
            mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
        }
        return mRequestQueue;
    }

    public <T> void addToRequestQueue(Request<T> req) {
        getRequestQueue().add(req);
    }
}

Step 4: Now Start coding MainActivity. java file in your project in the android app.

Note: in a MainActivity.java file use only useful code and remove extra code in this file

package com.example.schoolapp;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;

import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.example.schoolapp.Adapter.CreateFeeTypeAdapter;
import com.example.schoolapp.Fragments.DepositeStuFee;
import com.example.schoolapp.Fragments.SectionFragment;
import com.example.schoolapp.Model.CreateFeeTypeModel;

import org.json.JSONArray;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    ProgressDialog progressDoalog;

    List<CreateFeeTypeModel> createFeeTypeModelList;
    ListView list;
    ArrayAdapter<String> adapter;
    ArrayList<String> listoffeetype;
    ArrayList<String> listoffeeid;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_Main);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        list=findViewById(R.id.list);
        createFeeTypeModelList=new ArrayList<>();
        listoffeetype=new ArrayList<>();
        listoffeeid=new ArrayList<>();

        progressDoalog=new ProgressDialog(this);
        LoadFeeTypeDetails();

       
    }

    private void LoadFeeTypeDetails() {
        //getting the progressbar

        //making the progressbar visible
        progressDoalog.setMessage("Loading....");
        progressDoalog.setTitle("Fetch Data");
        progressDoalog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        progressDoalog.show();

        //creating a string request to send request to the urland this is only get methord Request code
        StringRequest stringRequest = new StringRequest(Request.Method.GET, "Put your API Key ",
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        //hiding the progressbar after completion
                        progressDoalog.dismiss();


                        try {

                            //getting the whole json object from the response
                            JSONObject obj = new JSONObject(response);
                            if(obj.getBoolean("IsSuccess")) {
                                adapter=null;
                                listoffeeid.clear();
                                listoffeetype.clear();
                                JSONArray stuarray = obj.getJSONArray("ResponseData");

//
//                            //now looping through all the elements of the json array
                                createFeeTypeModelList.clear();

                                for (int i = 0; i < stuarray.length(); i++) {
                                    //getting the json object of the particular index inside the array
                                    JSONObject studentObject = stuarray.getJSONObject(i);
                                    try {
                                        createFeeTypeModelList.add(new CreateFeeTypeModel(
                                                studentObject.getString("Id"),
                                                studentObject.getString("FeeType1"),
                                                studentObject.getBoolean("IsActive"),
                                                studentObject.getBoolean("IsDeleted")));
                                        listoffeetype.add( studentObject.getString("FeeType1"))  ;
                                        listoffeeid.add( studentObject.getString("Id"))  ;
                                    }
                                    catch (Exception e){
                                        createFeeTypeModelList.add(new CreateFeeTypeModel(
                                                studentObject.getString("Id"),
                                                "null",
                                                true,
                                                false));
                                    }

                                }
                               adapter=new ArrayAdapter<>(UpdateStudentFee.this,android.R.layout.simple_list_item_1,listoffeetype);
                                list.setAdapter(adapter);


                                //  UpadateFee();
                            }


                            //   Log.d("ashishsikarwar",response);


                        } catch (Exception e) {

                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressDoalog.dismiss();

                        //displaying the error in toast if occurrs
                        Toast.makeText(UpdateStudentFee.this, "Your Internet Connection is Failed ", Toast.LENGTH_SHORT).show();

                    }
                });

        //creating a request queue
        RequestQueue requestQueue = Volley.newRequestQueue(UpdateStudentFee.this);

        //adding the string request to request queue
        requestQueue.add(stringRequest);
    }

  
}

step 5: creat a model class 

package com.example.schoolapp.Model;

public class CreateFeeTypeModel {


    public String getID() {
        return ID;
    }

    public String getFeeType1() {
        return FeeType1;
    }

    public boolean isActive() {
        return IsActive;
    }

    public boolean isDeleted() {
        return IsDeleted;
    }



    public CreateFeeTypeModel(String ID, String feeType1, boolean isActive, boolean isDeleted) {
        this.ID = ID;
        FeeType1 = feeType1;
        IsActive = isActive;
        IsDeleted = isDeleted;
    }
    String ID;
    String FeeType1;
    boolean IsActive;
    boolean IsDeleted;
}

final Step: Run this code in your project if any problem in this code comment this and I solve your problem