Activities and fragments

MainActivity

Has 2 fragments, Map and login/register

Example code for switching between them:

private void onCheckChanged() {
    FragmentManager fm = this.getSupportFragmentManager();

    if (checkBox.isChecked()) {
        // Remove the billingAddressFragment, because we no longer need it
        // (because the billing address is the same as the shipping address)

        fm.beginTransaction()
            .remove(billingAddressFragment)
            .commit();
    }
    else {
        // Create the billingAddressFragment, because the billing address is now
        // different than the shipping address

        //billingAddressFragment = AddressFragment.newInstance("BILLING ADDRESS");

        billingAddressFragment = new AddressFragment();
        Bundle args = new Bundle();
        args.putString(AddressFragment.ARG_TITLE, "BILLING ADDRESS");
        billingAddressFragment.setArguments(args);

        fm.beginTransaction()
                .add(R.id.billingFrameLayout, billingAddressFragment)
                .commit();
    }
}

Directory of model objects.

The main model class: (It's a Singleton Design Pattern)

Map<String(id of person or event), Event/Person> variable;
settings object
List<String> eventTypes;
person object of the user
list of each person's children
Sets of the ids of each paternal and maternal ancestor of the user

Starting code from lecture:

package model;

public class DataCache {
	private static DataCache _instance = new DataCache();
	public static DataCache getInstance() {
		return _instance;
	}
	private Map<String, Person> people;
	private Map<String, Event> events;
	
	private DataCache(){ // private constructor because there can only be one
	}
}

Directory for Proxy

Starting/example code from lecture:

package new;

public LoginResult ServerProxy {

	public static String serverHostName; // variables gotten during login or registration screen
	pulic static Int serverPortNumber;
	
	public login(LoginRequest r) {
		// Serialize request as JSON styring
		// Make HTTP request to server 
		// Deserialize response body to LoginResult object
	}
	
	public RegisterResult register(RegisterRequest r){
		...
	}
	
	// other methods:
	// GetAllPeople
	// GetAllEvents
}

Use the TicketToRide example code to see how to make HTTP requests.

http.setDoOutput() means tell whether there's a request body or not.

Screen Rotation extra credit

Android will kill an activity upon reorientation, so we need to use a special method to persist some data that we may have been working on.

@Override
protected void onSaveInstance(Bundle savedInstanceState) {// a bundle is basically just a map
	super.onSaveInstanceState(savedInstanceState);
	Log.i(TAG, "onSaveInstanceState"); // just logging it, not necessary.
	savedInstanceState.putInt(DATA_CHOSEN, myIntegerData);
}

Notice that the method that's called by the android system at the creation of an activity, onCreate, has a now familiar parameter:

@Override
protected void onCreate(Bundle savedInstanceState){ ...

Within that method, you'll wanna check whether that state is null.

if (savedInstanceState != null) {
	myIntegerData = savedInstanceState.getInt(DATA_CHOSEN, 0);
}

Additionally, super.onCreate(savedInstanceState) let's your widgets in the ui save their data to the bundle.

3.6 KiB Raw Blame History

Activities and fragments

MainActivity

Directory of model objects.

Directory for Proxy

Screen Rotation extra credit

3.6 KiB

Raw Blame History