By Jason Morris

It is a step by step consultant that goals to provide even a amateur Android developer an outstanding grab of user-interface layout, whereas operating via examples, diagrams, and screenshots to exhibit a few of the widgets and instruments that the platform makes on hand.

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Extra resources for Android User Interface Development: Beginner's Guide

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Other than the margins between the answer buttons, and the Skip Question and Feed Me! buttons, you can't really tell them apart. We need to let the user know that these buttons all do different things. We also need to draw more attention to the question, especially if they don't have a lot of time to squint at their screen. com/reference/. We have a question at the top of our screen, but as you can see in the previous screenshots, it doesn't stand out much. Therefore, it's not really very clear to the user what they need to do (especially the first time they use the application).

We then call notifyDataSetInvalidated() on the BurgerAdapter. This method will inform the ListView that the underlying data has changed. getView method for each item in the ListView. The items in a ListView are represented by effectively static View objects. This means that the Adapter must be allowed to update or recreate that View when the data model is updated. A common alternative is to fetch the View representing your updated data, and update it directly. xml file. TheBurgerPlaceActivity"/> To start the Activity, you'll need to go back to SelectRestaurantActivity and implement the OnItemClickListener interface.

Button elements from the layout resource. 3. java file in an editor or IDE. 4. We will need a new class field to hold the dynamically-created Button objects (for reference): private Button[] buttons; 5. In order to keep things neat, create a new private method to put the questions on the screen: initQuestionScreen: private void initQuestionScreen() { 6. In this method, we assume that the layout XML file has already been loaded into the Activity screen (that is, it will be invoked after we setContentView in onCreate).

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