No Data in Fragment with RestFul Web Service

Heading ##There is my source code , but it has list without web service ?

what's wrong has no idea

My Detail view with viewpager public class DviewActivity extends FragmentActivity {

public static ArrayList<Course> courselist = invokeDetailview();

static int NUM_ITEMS;

MyAdapter mAdapter;
ViewPager mPager;

ProgressDialog prgDialog;
TextView errMessage;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dview);
    prgDialog = new ProgressDialog(this);
    prgDialog.setMessage("Loading Data...");
    prgDialog.setCancelable(false);
    //courselist.add(new Course(1,"aaa","bbb"));
    //courselist.add(new Course(2,"bbb","bbb"));
    //courselist.add(new Course(3,"ccc","bbb"));
    //NUM_ITEMS = courselist.size();
    NUM_ITEMS = courselist.size();
    mAdapter = new MyAdapter(getSupportFragmentManager());

    mPager = (ViewPager)findViewById(R.id.viewPager);
    mPager.setAdapter(mAdapter);


    //CustomlistAdapter adapter = new CustomlistAdapter(this,courselist);
    //ListView listview = (ListView)findViewById(R.id.listView1);
    //listview.setAdapter(adapter);



}

protected static ArrayList<Course> invokeDetailview(){
    //prgDialog.show();
    final ArrayList<Course> result = new ArrayList<Course>();

    AsyncHttpClient Client = new AsyncHttpClient();
    Client.get("http://ift.tt/1Bq99lM", new AsyncHttpResponseHandler(){
          // When the response returned by REST has Http response code other than '200'

        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable
                 error) {
            System.out.println("OnFailure");
            // TODO Auto-generated method stub
             // Hide Progress Dialog 
           // prgDialog.hide();
            // When Http response code is '404'
            if(statusCode == 404){

             //   Toast.makeText(getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
            } 
            // When Http response code is '500'
            else if(statusCode == 500){
               // Toast.makeText(getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
            } 
            // When Http response code other than 404, 500
            else{
               // Toast.makeText(getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
            }
        }

        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            // TODO Auto-generated method stub
            try{
                String response = new String(responseBody);

                JSONArray gsonarr = new JSONArray(response);
                result.addAll(Course.fromJSON(gsonarr));



            }catch(JSONException e){
                   // TODO Auto-generated catch block
            //       Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
                   e.printStackTrace();
            }
        }





    });

    return result;
}

FragmentStateAdapter & Fragment public static class MyAdapter extends FragmentStatePagerAdapter { //public ArrayList CourseList = new ArrayList(); public MyAdapter(FragmentManager fm) { super(fm);

    }

    @Override
    public int getCount()
    {
        return NUM_ITEMS;
    }

    @Override
    public Fragment getItem(int position)
    {
        return ArrayListFragment.newInstance(courselist,position);
    }
}

public static class ArrayListFragment extends Fragment
{


    int mNum;
     String mSEQ;
    String mHAWB;
    String mMAWB;

    /**
     * Create a new instance of CountingFragment, providing "num" as an
     * argument.
     */
    static ArrayListFragment newInstance(ArrayList<Course> courselist,int position)
    {
        //NUM_ITEMS = courselist.size();
        ArrayListFragment f = new ArrayListFragment();
        //Bundle args = new Bundle();
        //args.putInt("num", num);
        //f.setArguments(args);
        Bundle bundle = new Bundle();

        bundle.putString("SEQ", Integer.toString(courselist.get(position).SEQ));
        bundle.putString("HAWB", courselist.get(position).HAWB);
        bundle.putString("MAWB", courselist.get(position).MAWB);

        f.setArguments(bundle);

        return f;
    }





    /**
     * When creating, retrieve this instance's number from its arguments.
     */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        //mNum = getArguments() != null ? getArguments().getInt("num") : 1;
        mSEQ = getArguments() != null ? getArguments().getString("SEQ") : "String";
        mHAWB = getArguments() != null ? getArguments().getString("HAWB") : "String";
        mMAWB = getArguments() != null ? getArguments().getString("MAWB") : "String";



    }

    /**
     * The Fragment's UI is just a simple text view showing its instance
     * number.
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View v = inflater.inflate(R.layout.detailview, container, false);

        TextView tvSEQ = (TextView) v.findViewById(R.id.tvSEQ);
        TextView tvHAWB = (TextView) v.findViewById(R.id.tvHAWB);
        TextView tvMAWB = (TextView) v.findViewById(R.id.tvMAWB);
        tvSEQ.setText(mSEQ);
        tvHAWB.setText(mHAWB);
        tvMAWB.setText(mMAWB);

        return v;
    }
    ## Heading ##


}