HomeActivity.java

package com.dimuthuupeksha.viewer.android.ui;

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

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockListActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.dimuthuupeksha.viewer.android.applib.ROClient;
import com.dimuthuupeksha.viewer.android.applib.exceptions.ConnectionException;
import com.dimuthuupeksha.viewer.android.applib.exceptions.InvalidCredentialException;
import com.dimuthuupeksha.viewer.android.applib.exceptions.UnknownErrorException;
import com.dimuthuupeksha.viewer.android.applib.representation.Homepage;
import com.dimuthuupeksha.viewer.android.applib.representation.Link;
import com.dimuthuupeksha.viewer.android.uimodel.Model;

/* Author - Dimuthu Upeksha*/

public class HomeActivity extends SherlockListActivity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // setContentView(R.layout.list);
        ActionBar actionBar = getSupportActionBar();
        actionBar.setTitle(getResources().getString(R.string.home_page));
        new HomeTask(HomeActivity.this).execute();

    }

    protected void onListItemClick(ListView list, View view, int position, long id) {
        super.onListItemClick(list, view, position, id);
        Homepage homePage = Model.getInstance().getHomePage();
        Object selected = this.getListAdapter().getItem(position);
        // System.out.println("a "+homePage.getLinks().get(position).getRel());
        if (selected.toString().equals("services")) {
            Intent intent = new Intent(HomeActivity.this, ServicesActivity.class);
            intent.putExtra("link", homePage.getLinkByRel("services"));
            startActivity(intent);

        }

    }

    public boolean onCreateOptionsMenu(Menu menu) {
        com.actionbarsherlock.view.MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.basic_menu, (com.actionbarsherlock.view.Menu) menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Intent intent;
        switch (item.getItemId()) {

        case R.id.home:
            intent = new Intent(this, HomeActivity.class);
            startActivity(intent);
            break;
        case R.id.services:
            intent = new Intent(this, ServicesActivity.class);
            intent.putExtra("link", Model.getInstance().getHomePage().getLinkByRel("services"));
            startActivity(intent);
            break;
        case R.id.back:

        }
        return true;
    }

    public void render() {
        List<Link> links = Model.getInstance().getHomePage().getLinks();
        List<String> items = new ArrayList<String>();
        for (Link link : links) {
            items.add(link.getRel().replace("urn:org.restfulobjects:rels/", ""));
        }
        String[] values = items.toArray(new String[items.size()]);
        setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, values));
    }

    private class HomeTask extends AsyncTask<Void, Void, Homepage> {
        private final ProgressDialog pd;
        private final HomeActivity activity;
        int error = 0;
        private static final int INVALID_CREDENTIAL = -1;
        private static final int CONNECTION_ERROR = -2;
        private static final int UNKNOWN_ERROR = -3;

        private HomeTask(HomeActivity activity) {
            pd = new ProgressDialog(activity);
            pd.setMessage("Loading HomePage");
            this.activity = activity;
        }

        @Override
        protected void onPreExecute() {
            pd.show();
        }

        @Override
        protected Homepage doInBackground(Void... voids) {
            Homepage homePage = Model.getInstance().getHomePage();

            if (homePage == null) {
                try {
                    homePage = ROClient.getInstance().homePage();
                } catch (ConnectionException e) {
                    error = CONNECTION_ERROR;
                    e.printStackTrace();
                } catch (InvalidCredentialException e) {
                    error = INVALID_CREDENTIAL;
                    e.printStackTrace();
                } catch (UnknownErrorException e) {
                    error = UNKNOWN_ERROR;
                    e.printStackTrace();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            return homePage;
        }

        @Override
        protected void onPostExecute(Homepage homePage) {
            if (homePage != null) {
                Model.getInstance().setHomePage(homePage);
                activity.render();
            }

            if (error == INVALID_CREDENTIAL) {
                /* Username and password not valid show the Login */
                Intent intent = new Intent(HomeActivity.this, LogInActivity.class);
                HomeActivity.this.startActivity(intent);
            }

            if (error == CONNECTION_ERROR) {
                /** Show the error Dialog */
                AlertDialog alertDialog = new AlertDialog.Builder(HomeActivity.this).create();
                alertDialog.setTitle("Connection Error");
                alertDialog.setMessage("Please check your settings.");

                // Setting OK Button
                alertDialog.setButton("Close", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });

                // Showing Alert Message
                alertDialog.show();
            }
            
            if(error == UNKNOWN_ERROR){
                Intent intent = new Intent(HomeActivity.this,InitialAvtivity.class);
                Toast.makeText(getApplicationContext(), "Unknown error - Tryusing another url", Toast.LENGTH_SHORT).show();
                startActivity(intent);
            } 
            pd.hide();
        }
    }

}