RESTful Web Services Example | Parsing JSON data and show in Custom ListView

Step1:- Open your Android Studio.

Step2:-Click on File >New >New Project> RestfulExample

Step3:-Click on res>activity_main.xml and take 1 ListView

Note:- Before doing this example just give a look my previous JSON Parsing Example.

Step 4:- activity_main.xml code will be like following.

<?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:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context="androidhubb.gplus.MainActivity">

   <ListView

       android:layout_width="match_parent"

       android:layout_height="match_parent"

       android:id="@+id/list1"></ListView>

</RelativeLayout>


Step 5:- Click on > Gradle Scripts >build.gradle(Module:app) >a page will open with name of app >add following 

apply plugin: 'com.android.application'
android {
    compileSdkVersion 24
    buildToolsVersion "24.0.0"
    useLibrary 'org.apache.http.legacy'
    defaultConfig {
        applicationId "androidhubb.googleplace2"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.0.0'
}

Step 6:- MainActivity.class code will be like following.

package androidhubb.gplus;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.Toast;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.InputStream;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    //object    

ProgressDialog p;
    ListView lView;

    @Override    

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //progress       

 p=new ProgressDialog(this);
        p.setMessage("Buffering");

        //listview        

lView=(ListView)findViewById(R.id.list1);

        //call class...        

MyTask t=new MyTask();
        t.execute();
    }

    public class MyTask extends AsyncTask<String,String,String>{
        String msg="";
        @Override        

protected void onPreExecute() {
            super.onPreExecute();
            p.show();
        }
        @Override        

protected String doInBackground(String... strings) {
            //call http client..            

try {
                DefaultHttpClient client = new DefaultHttpClient();
                HttpGet get=new HttpGet("http://www.omdbapi.com/?s=Batman&page=2");
                HttpResponse res = client.execute(get);
                InputStream input=res.getEntity().getContent();
                int i=input.read();
                while(i!=-1){
                    msg=msg+(char)i;
                    i=input.read();
                }
            }
            catch (Exception e){}
            return null;
        }

        @Override       

 protected void onPostExecute(String s) {
            super.onPostExecute(s);
            p.dismiss();
            Toast.makeText(getApplicationContext(),msg,Toast.LENGTH_LONG).show();
            getOutput(msg);
        }

        @Override        

protected void onProgressUpdate(String... values) {
            super.onProgressUpdate(values);
            //while doing background process we can handle ui by using this method        }
    }
    //get method....    

public void getOutput(String result){

      //JSON..       

 try {
            ArrayList<String> list_name=new ArrayList<String>();
            ArrayList<String> list_add=new ArrayList<String>();
            list_add.clear();
            list_name.clear();
            JSONObject obj = new JSONObject(result);
            JSONArray arr=obj.getJSONArray("Search");
            for(int j=0;j<arr.length();j++) {
                JSONObject obj_ind = arr.getJSONObject(j);

                list_name.add(obj_ind.getString("Title"));
                list_add.add(obj_ind.getString("Type"));

                //adapter calling...                

lView.setAdapter(new Adapter(this,list_name,list_add));

            }
        }
        catch (Exception e){}
    }
}

Step 7:-For displaying data into list view we have to take another layout file with name adapter.

Step 8:-Go>app>res>layout>right click on layout and >new >layout resource file>adapter.xml.

Step 9:- adapter.xml looks like following

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/txtName"
        android:text="name"
        android:textSize="30sp"
        android:textColor="#ff0000"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/txtAddress"
        android:text="Address"
        android:textSize="25sp"
        android:textColor="#000000"/>
</LinearLayout>

Step 10:- Now for adapter.xml we have to create a java class with name Adapter.java in app > java > package name > right click on Package name >new > java class

Step 9:- Adapter.java will look like following.

package androidhubb.gplus;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;

/** * Created by Supriya on 8/4/2016. */
public class Adapter extends BaseAdapter{
    MainActivity obj;
    ArrayList<String> n;
    ArrayList<String> a;
    LayoutInflater layoutIn;
    public Adapter(MainActivity main, ArrayList<String> name,ArrayList<String> add){
        this.obj=main;
        this.n=name;
        this.a=add;
        this.layoutIn=LayoutInflater.from(main);
    }
    @Override    
public View getView(int i, View view, ViewGroup viewGroup) {
        view=layoutIn.inflate(R.layout.adapter,null);
        TextView textName=(TextView)view.findViewById(R.id.txtName);
        TextView txtadd=(TextView)view.findViewById(R.id.txtAddress);
        textName.setText(n.get(i));
        txtadd.setText(a.get(i));
        return view;
    }

    @Override    
public int getCount() {
        return n.size();
    }
    @Override    
public long getItemId(int i) {
        return 0;
    }
    @Override    
public Object getItem(int i) {
        return null;
    }
}
Example:- you can practice on following web link..

http://www.omdbapi.com/?i=tt0944947&Season=1

http://www.omdbapi.com/?s=Batman&page=2