Retrieve JSON from url in android in Main Class

Question

I have a very simple android project which is a basic list of items.

Is it possible to get a JSON from a URL in the same Main.java class without needing any other classes or files?

Basically is there a script that's small and minimal that can be used in any project?

I am very new to java and android development so i am having trouble incorporating scripts into my project.

Main.java

package com.jamfactory.articles;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

public class Main extends Activity {
    private ListView listView1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);                   


        // Get JSON

        // Get JSON      


        List article_data[] = new List[]
        {
            new List(R.drawable.cloudy, "Article One", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.showers, "Article Two", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.snow, "Article Three", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.storm, "Article Four", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.sunny, "Article Five", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.")
        };





        ListAdapter adapter = new ListAdapter(this,
                R.layout.listview_item_row, article_data);


        listView1 = (ListView)findViewById(R.id.listView1);

        View header = (View)getLayoutInflater().inflate(R.layout.listview_header_row, null);
        listView1.addHeaderView(header);

        listView1.setAdapter(adapter);
    }}

Yes It is possible but you need to use AsyncTask class. You shouldnt run network operation in MainActivity Directly. — user3264399, Feb 07 '14 at 08:21
Don't ask for code. Google a bit before posting a question or show us what you have done — alecnash, Feb 07 '14 at 08:23

Mayank Saini · Accepted Answer · 2014-02-07T08:40:01.917

package com.jamfactory.articles;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

public class Main extends Activity {
    private ListView listView1;
    String JSON;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);                   
        String url = “”//the url from where you want to fetch the
JSON
        new PerformBackgroundTask.execute(url);
        // Get JSON

        // Get JSON      


        List article_data[] = new List[]
        {
            new List(R.drawable.cloudy, "Article One", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.showers, "Article Two", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.snow, "Article Three", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.storm, "Article Four", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."),
            new List(R.drawable.sunny, "Article Five", "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.")
        };





        ListAdapter adapter = new ListAdapter(this,
                R.layout.listview_item_row, article_data);


        listView1 = (ListView)findViewById(R.id.listView1);

        View header = (View)getLayoutInflater().inflate(R.layout.listview_header_row, null);
        listView1.addHeaderView(header);

        listView1.setAdapter(adapter);
    }}



class PerformBackgroundTask extends AsyncTask<Void, Void, Void> {
String url;
        public PerformBackgroundTask(String url1){
this.url = url1;
}

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

           JSON = performHtpGet(url)

    //HERE JSON IS THE VALUE WHICH IS FETCHED
            return null;
        }

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

    }


 private String performHtpGet(String queryUrl ){
            try{
                DefaultHttpClient httpClient = new DefaultHttpClient();
                Log.d("Inside performHtpGet():", "1");
                HttpGet get = new HttpGet(BASE_URL+queryUrl);
                Log.d("Inside performHtpGet():", "2");
                HttpResponse response = httpClient.execute(get);
                Log.d("Inside performHtpGet():", "4");
                String result = EntityUtils.toString(response.getEntity());
                Log.d("Inside performHtpGet():", "5");          
                return result;
            }catch(Exception e){
                return null;
            }
        }

This gives me a bunch of errors in Eclipse but if i move it into it's own json.java class they go away. but how do i connect the data to return to the Main.java class? So sorry i am very confused :) — Sebastian, Feb 07 '14 at 08:30
I have edited the code try dis. Here "result" is the JSON you want to use — Mayank Saini, Feb 07 '14 at 08:33

Retrieve JSON from url in android in Main Class

1 Answers1