Working with views in Java

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Working with views
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B. You ll learn more about ReviewAdapter in the next section, when we discuss custom views. The important part here is that we re using a custom Adapter for our ListView, and we use a List of Review objects to populate the Adapter. Because we don t yet have the data to populate the list, which we ll get from a web service call in another Thread, we need to include a Handler to allow for fetching data and updating the UI to occur in separate steps. Don t worry too much about these concepts here; they ll make more sense shortly when we discuss them while looking at the second half of ReviewList in listing 3.4. After we declare our ListView and its data, we move on to the typical onCreate() tasks you ve already seen, including using a layout defined in an XML file C. This is significant with respect to ListActivity because a ListView with the ID name list is required if you want to customize the layout, as we ve done. Note that the ID is defined in the layout XML file; we ll cover that in section 3.3.3. If you don t provide a layout, you can still use ListActivity and ListView, but you just get the system default configuration. We re also defining a UI element that s used to display the message No Data in the event that our List of reviews is empty D. We re setting several specific properties on the ListView, using its customization methods: whether the list items themselves are focusable, how many elements can be selected at a time, and the View to use when the list is empty. After we set up the View elements that are needed on the Activity, we get the criteria to make our web service call from the Review object we previously placed in the Application from the ReviewCriteria Activity E. Here we also use an Intent extra to store a primitive int for page number F. We pass all the criteria data (criteriaLocation, criteria-Cuisine, and startFrom) into the loadReviews() method, which makes our web service call to populate the data list. This method, and several others that show how we deal with items in the list being clicked on, are shown in the second half of the ReviewList class in the following listing.
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ReviewAdapter class
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Listing 3.4 The second half of the ReviewList Activity class
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. . . @Override public boolean onMenuItemSelected (int featureId, MenuItem item) { Intent intent = null;
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Increment startFrom switch (item.getItemId()) { Intent extra case MENU_GET_NEXT_PAGE: intent = new Intent(Constants.INTENT_ACTION_VIEW_LIST); intent.putExtra(Constants.STARTFROM_EXTRA, getIntent().getIntExtra(Constants.STARTFROM_EXTRA, 1) + ReviewList.NUM_RESULTS_PER_PAGE); startActivity(intent); return true; case MENU_CHANGE_CRITERIA: intent = new Intent(this, ReviewCriteria.class);
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startActivity(intent); return true; } return super.onMenuItemSelected(featureId, item); } @Override Get Application protected void onListItemClick(ListView l, View v, object and int position, long id) { set state RestaurantFinderApplication application = (RestaurantFinderApplication) getApplication(); application.setCurrentReview(this.reviews.get(position)); Intent intent = new Intent(Constants.INTENT_ACTION_VIEW_DETAIL); intent.putExtra(Constants.STARTFROM_EXTRA, getIntent().getIntExtra( Constants.STARTFROM_EXTRA, 1)); startActivity(intent); } private void loadReviews(String location, String cuisine, int startFrom) { Create final ReviewFetcher rf = new ReviewFetcher(location, loadReviews cuisine, "ALL", startFrom, method ReviewList.NUM_RESULTS_PER_PAGE); this.progressDialog = Show ProgressDialog.show(this, " Working...", ProgressDialog " Retrieving reviews", true, false); new Thread() { Make web public void run() { service call reviews = rf.getReviews(); handler.sendEmptyMessage(0); } }.start(); }
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This Activity has a menu item that allows the user to get the next page of results or change the list criteria. To support this, we have to implement the onMenuItemSelected method. When the MENU_GET_NEXT_PAGE menu item is selected, we define a new Intent to reload the screen with an incremented startFrom value, with some assistance from the Intent class s getExtras() and putExtras() methods B. After the menu-related methods, you see a method named onListItemClick(). This method is invoked when one of the list items in a ListView is clicked. We use the ordinal position of the clicked item to reference the particular Review item the user selected, and we set this into the Application for later use in the Review-Detail Activity (which you ll begin to implement in section 3.3) C. After we have the data set, we then call the next Activity, including the startFrom extra. In the ReviewList class, we have the loadReviews() method D. This method is significant for several reasons. First, it sets up the ReviewFetcher class instance, which is used to call out to the Google Base API over the network and return a List of Review objects. Then it invokes the ProgressDialog.show() method to show the user we re retrieving data E. Finally, it sets up a new Thread F, within which the ReviewFetcher is used, and the earlier Handler you saw in the first half of ReviewList is sent
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