Our 'new look' Home Screen - Edit a Coffee

We can now launch the Edit Screen, but nothing gets displayed, so there's nothing to edit. What we need to do now is

• 'bind' the specific coffee data to the individual views/fields on the Edit Screen

• if any changes are made, ensure these changes are reflected in the global coffeeList

Displaying the data for Update

First of all, open your edit.xml layout and familarise yourself with the 'names' or id's of all the relevant views you need to access (coffeeNameTextView is highlighted in the screenshot below).

And here's how we set the title 'field' to the name of the coffee

((EditText)findViewById(R.id.nameEditText)).setText(aCoffee.name);

Run the app again, and see what you get - now have a go at the rest of the coffee data yourself.

The completed section of missing code is as follows:

        setContentView(R.layout.edit);

        activityInfo = getIntent().getExtras();
        aCoffee = getCoffeeObject(activityInfo.getInt("coffeeID"));

        ((TextView)findViewById(R.id.coffeeNameTextView)).setText(aCoffee.name);
        ((TextView)findViewById(R.id.coffeeShopTextView)).setText(aCoffee.shop);

        ((EditText)findViewById(R.id.nameEditText)).setText(aCoffee.name);
        ((EditText)findViewById(R.id.shopEditText)).setText(aCoffee.shop);
        ((EditText)findViewById(R.id.priceEditText)).setText(""+aCoffee.price);
        ((RatingBar) findViewById(R.id.coffeeRatingBar)).setRating((float)aCoffee.rating);

        favouriteImage = (ImageView) findViewById(R.id.favouriteImageView);

        if (aCoffee.favourite == true) {
            favouriteImage.setImageResource(R.drawable.ic_favourite_on);
            isFavourite = true;
        } else {
            favouriteImage.setImageResource(R.drawable.ic_favourite_off);
            isFavourite = false;
        }

including attaching a listener to the 'Update' Button, via xml.

android:onClick="update"

with our toggle() method looking something like this:

public void toggle(View arg0) {

        if (isFavourite) {
            aCoffee.favourite = false;
            toastMessage("Removed From Favourites");
            isFavourite = false;
            favouriteImage.setImageResource(R.drawable.ic_favourite_off);
        } else {
            aCoffee.favourite = true;
            toastMessage("Added to Favourites !!");
            isFavourite = true;
            favouriteImage.setImageResource(R.drawable.ic_favourite_on);
        }
    }

It's still not finished however - there's a small but significant bug in loading up the correct coffee to update on the edit screen and the update() method is nearly complete, but there's a few lines of (very important) code still to be added, so run the app once more and try and identiy what needs to be done to fully implement this Edit/Update feature.

You'll find the necessary code extracts in the the next step, but try and have a go before you proceed.