Download Creating Apps in Kivy by Dusty Phillips PDF

By Dusty Phillips

Construct cellular apps successfully with Kivy, the Python-powered graphical toolkit for growing usual person interfaces with stylish multitouch aid. With this hands-on consultant, you’ll examine step by step how you can construct and set up an entire Kivy app for iOS and Android units. If you’re simply starting to paintings with Python, yet are quite conversant in its syntax, you’re able to go.

Each bankruptcy contains routines, utilizing examples that run on Python three and Python 2.7. find out how Kivy simplifies cellular improvement with its cross-platform API and domain-specific Kv language, and why this unfastened and open resource toolkit is perfect for advertisement products.

- layout customized widgets with the Kv language
- Delve into Kivy occasions, occasion handlers, and properties
- Dynamically switch which Kivy widgets are displayed
- comprehend and follow iterative improvement principles
- Create simple animations, utilizing Canvas and pics primitives
- shop neighborhood info with Kivy’s robust key price store
- upload uncomplicated gestures to modify among app views
- enhance your app’s usability with Kivy’s integrated widgets
- installation the app on your Android or iOS gadget, utilizing Buildozer

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Programming books tend to introduce the subject as if you will be writing all of your work from scratch. This isn’t true. The success of any new application is strongly impacted by what third-party libraries or APIs are used to create it. I spend a vast amount of time up front researching available options and trying to figure out which one will maximize the effectiveness of my app. For any given problem that you need to solve, search the Web to see what existing libraries are available. Programmers hate duplicating work, and you’ll find most tasks Populating the Search Result List | 27 have already been completed!

Example 4-5 summarizes the new method added to the AddLo cationForm class. 50 | Chapter 4: Iterative Development Example 4-5. args_converter method on AddLocationForm def args_converter(self, index, data_item): city, country = data_item return {'location': (city, country)} All it does is set a location property on the button. However, LocationButton doesn’t have a location property, so we’ll alter that next. You’ll want a ListProperty, so adjust your imports first, as shown in Example 4-6. Example 4-6.

It’s still trying to update the default class on a ListView, called a SimpleListAdapter. This is easily remedied, as shown in Example 3-5. Example 3-5. _trigger_reset_populate() You can’t just set the data to an empty list because the container involved is an instance of ObservableList. Instead, clear the list… …and then extend it with the new data. ListView Adapters | 37 ListAdapter is supposed to update the display when it sees the data change, but it’s not doing its job, so you should force an update here.

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