Android JSON parsing Easy tutorial

AndroidManifest.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>

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;

@Overrideprotected 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);
    }
}