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Expandable Listview with JSON data

http://androidknowledgeblog.blogspot.com/2016/06/expandable-listview-with-json-data.html

Hello guys  Today i am going to show you how to add JSON DATA in Exapandable Listview. There was   a lost of example of expandable lis...
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Hello guys

 Today i am going to show you how to add JSON DATA in Exapandable Listview.

There was a lost of example of expandable listview but they were using static data. So here i posted json data in expandable listview. 

Download demo from here......

DOWNLOAD


I am using this url for fetch data http://www.androidbegin.com/tutorial/jsonparsetutorial.txt

json data look like this

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{
  worldpopulation: [
    {
      rank: 1,
      country: "China",
      population: "1,354,040,000",
      flag: "http://www.androidbegin.com/tutorial/flag/china.png"
    },
    {
      rank: 2,
      country: "India",
      population: "1,210,193,422",
      flag: "http://www.androidbegin.com/tutorial/flag/india.png"
    },
    {
      rank: 3,
      country: "United States",
      population: "315,761,000",
      flag: "http://www.androidbegin.com/tutorial/flag/unitedstates.png"
    },
    {
      rank: 4,
      country: "Indonesia",
      population: "237,641,326",
      flag: "http://www.androidbegin.com/tutorial/flag/indonesia.png"
    }
  ]
}

And  i am fetching header as country name and population and rank as child data.

see image here



First add this layout files.

activity_main.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#f4f4f4" >

    <ExpandableListView
        android:id="@+id/lvExp"
        android:layout_height="match_parent"
        android:layout_width="match_parent"/>

</LinearLayout>
 

list_group.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="8dp"
    android:background="#000000">


    <TextView
        android:id="@+id/lblListHeader"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
        android:textSize="17dp"
        android:text="group"
        android:textColor="#f9f93d" />

</LinearLayout>


list_item.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="55dip"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/lblListItem"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="17dip"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:text="dsfd"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />

</LinearLayout>


Then move to java file copy and paste file in your project

JSONParser.java

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import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class JSONParser {

    public JSONParser() {

    }

    public String makeServiceCall(String serviceUrl) {
        Boolean registered = false;
        StringBuffer response = new StringBuffer();
        URL url = null;

        HttpURLConnection conn = null;
        try {

            url = new URL(serviceUrl);
            conn = (HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(30000);
            conn.setDoOutput(false);
            conn.setUseCaches(false);
            conn.setRequestMethod("GET");
            conn.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded;charset=UTF-8");
            int status = conn.getResponseCode();
            if (status != 200) {
                throw new IOException("Post failed with error code " + status);
            }
            registered = true;

            // Get Response
            InputStream is = conn.getInputStream();
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));
            String line;

            while ((line = rd.readLine()) != null) {
                response.append(line);

            }
            rd.close();

        } catch (Exception e) {
            e.printStackTrace();
      /* ErrorLogger.writeLog(claimNo, "Error Msg : "+e.getMessage()+"..."+ErrorLogger.StackTraceToString(e), "sendSyncService Failed");
         response.append("Error");*/
        }
        Log.v("Response:", response.toString());
        return response.toString();

    }

}

ExpandableListAdapter.java

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import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

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

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ExpandableListView.OnGroupCollapseListener;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.Toast;

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

import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class MainActivity extends Activity {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    private ProgressDialog mprocessingdialog;
    private static String url = "http://www.androidbegin.com/tutorial/jsonparsetutorial.txt";

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

        mprocessingdialog = new ProgressDialog(this);

        // get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // preparing list data
        new DownloadJason().execute();


    }

    /*
     * Preparing the list data
     */

    private class DownloadJason extends AsyncTask<Void, Void, Void> {


        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();

//            Showing Progress dialog

            mprocessingdialog.setTitle("Please Wait..");
            mprocessingdialog.setMessage("Loading");
            mprocessingdialog.setCancelable(false);
            mprocessingdialog.setIndeterminate(false);
            mprocessingdialog.show();
        }

        @Override
        protected Void doInBackground(Void... arg0) {
            // TODO Auto-generated method stub

            JSONParser jp = new JSONParser();
            String jsonstr = jp.makeServiceCall(url);
            Log.d("Response = ", jsonstr);

            if (jsonstr != null) {
//            For Header title Arraylist
                listDataHeader = new ArrayList<String>();
//                Hashmap for child data key = header title and value = Arraylist (child data)
                listDataChild = new HashMap<String, List<String>>();

                try {

                    JSONObject jobj = new JSONObject(jsonstr);
                    JSONArray jarray = jobj.getJSONArray("worldpopulation");

                    for (int hk = 0; hk < jarray.length(); hk++) {
                        JSONObject d = jarray.getJSONObject(hk);

                        // Adding Header data
                        listDataHeader.add(d.getString("country"));

                        // Adding child data for lease offer
                        List<String> lease_offer = new ArrayList<String>();

                        lease_offer.add(d.getString("country") + "'s Rank is : "
                                + d.getString("rank"));
                        lease_offer.add("And Population is " + d.getString("population"));

                        // Header into Child data
                        listDataChild.put(listDataHeader.get(hk), lease_offer);

                    }
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            } else {
                Toast.makeText(getApplicationContext(),
                        "Please Check internet Connection", Toast.LENGTH_SHORT)
                        .show();

            }

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            mprocessingdialog.dismiss();
//call constructor
            listAdapter = new ExpandableListAdapter(getApplicationContext(), listDataHeader, listDataChild);

            // setting list adapter
            expListView.setAdapter(listAdapter);

        }
    }

}


    Manifest file

   
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hometech.expandabledemo">

    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>


NOTE :- Don't forget to add INTERNET permission in manifest file 


Demo DOWNLOAD


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