Android JSON data parsing

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context="com.example.oshin.myjson.MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/t1"
        android:textSize="25sp"
        android:textStyle="bold"

        />



</LinearLayout>

MainActivity.java

    private TextView t1;

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

        t1= (TextView) findViewById(R.id.t1);

        jsonTask jTask = new jsonTask();
        jTask.execute();

    }


    public class jsonTask extends AsyncTask<String,String,String>{


        @Override
        protected String doInBackground(String... strings) {

            HttpURLConnection httpURLConnection = null;
            BufferedReader bufferedReader = null;
              String name;
            Integer age;
            String description;
            try {
                URL url = new URL("https://api.myjson.com/bins/b4pdd");
                httpURLConnection = (HttpURLConnection) url.openConnection();
                InputStream inputStream = httpURLConnection.getInputStream();
                bufferedReader= new BufferedReader(new InputStreamReader(inputStream));
                StringBuffer stringBuffer=new StringBuffer();
                String line= "";
                StringBuffer lastBuffer = new StringBuffer();
                while((line=bufferedReader.readLine()) != null){

                    stringBuffer.append(line);

                }
                String file = stringBuffer.toString();


                JSONObject fileObject = new JSONObject(file);
                JSONArray  jsonArray = fileObject.getJSONArray("studentinfo");

                for(int i=0; i<jsonArray.length(); i++) {
                    JSONObject arrayObject = jsonArray.getJSONObject(i);
                    name = arrayObject.getString("name");
                    age = arrayObject.getInt("age");
                    description = arrayObject.getString("description");

                    lastBuffer.append(name+"\n"+age+"\n"+description+"\n\n");
                }
                return  lastBuffer.toString();



            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (JSONException e) {
                e.printStackTrace();
            } finally {
                httpURLConnection.disconnect();
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }


            return null;
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            t1.setText(s);
        }
    }

manifest.xml

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

    <uses-permission android:name="android.permission.INTERNET"></uses-permission>


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        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>