Android Tutorial Part I

Create the Hoodyoodoo Class

For the purposes of the Tutorial, we will instantiate the FatFractal class as a singleton in a new Hoodyoodoo class which is a subclass of Application.

First, add a new class to com.hoodyoodoo.droidapp called Hoodyoodoo that subclasses Application. This class will do a couple of things for us:

• Create a singleton FatFractal object, which we use to talk to the API.
• Provide a method to display a login dialog.

First, enter the following package and import statements:

package com.hoodyoodoo.droidapp;

import android.app.AlertDialog;
import android.app.Application;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import com.fatfractal.ffef.FFException;
import com.fatfractal.ffef.FatFractal;
import com.fatfractal.ffef.impl.FatFractalHttpImpl;
import com.fatfractal.ffef.json.FFObjectMapper;
import com.hoodyoodoo.droidapp.model.Celebrity;

import java.net.URI;
import java.net.URISyntaxException;

Here, we define the Hoodyoodoo class itself:

public class Hoodyoodoo extends Application {

}

The rest of this section will be filling in the definition of the Hoodyoodoo class. We first define a static FatFractal data member:

public static FatFractal ff = null;

Next, define a getFF method that initializes the FatFractal class, sets the URL configuration for which API it will use, and registers the Celebrity Class:

public static FatFractal getFF() {
    if (ff == null) {
        String baseUrl = "http://acme.fatfractal.com/hoodyoodoo";
        String sslUrl = "https://acme.fatfractal.com/hoodyoodoo";
        try {
            ff = FatFractal.getInstance(new URI(baseUrl), new URI(sslUrl));
            FatFractalHttpImpl.addTrustedHost("acme.fatfractal.com");
            FFObjectMapper.registerClassNameForClazz(Celebrity.class.getName(), "Celebrity");
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
    }
    return ff;
}

We call getFF in the standard onCreate() method for Application:

public void onCreate() {
    super.onCreate();
    if (ff == null) {
        ff = Hoodyoodoo.getFF();
    }
}

In the next section, we finish the Hoodyoodoo class by making a layout for a login dialog, and adding a method to show it and perform the login.

NEXT: Create a Login Dialog