By Dave Smith
Step via quite a lot of worthy subject matters utilizing entire and real-world operating code examples; comprises greater than a hundred down-to-earth code recipes. This publication is up-to-date to incorporate the Android 5.0 SDK, in addition to prior releases. rather than summary descriptions of complicated options, in Android Recipes, you will find reside code examples. in the event you commence a brand new venture you could reflect on copying and pasting the code and configuration records from this e-book after which editing them to your personal customization needs.
Crammed with insightful guide and valuable examples, this fourth version of Android Recipes is your consultant to writing apps for one in every of today’s most popular cellular systems. It deals pragmatic suggestion to help you get the activity performed fast and good. this may prevent loads of paintings over making a undertaking from scratch!
Android remains to be one of many prime cellular OS and improvement structures using present day cellular options and the apps atmosphere. Android seems advanced, yet bargains a number of equipped improvement kits to these entering Android with differing programming language ability sets.
What you’ll learn
- Code for Android smartphones and tablets
- Use exterior libraries to save lots of time and effort
- Boost app functionality by utilizing the Android NDK and RenderScript
- Design apps for functionality, responsiveness, and seamlessness
- Send info among units and different exterior hardware
- Persist software information and percentage it among applications
- Capture and play again a number of equipment media items
- Communicate with net services
- Get the main from your consumer interface
Who this booklet is for
This booklet is a convenient reference for all Android app builders.
Table of Contents
1. Layouts and Views
2. person Interaction
3. Communications and Networking
4. Interacting with gadget and Media
5. Persisting Data
6. Interacting with the System
7. pictures and Drawing
8. operating with Android NDK and Renderscript
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Extra info for Android Recipes A Problem-Solution Approach for Android 5.0
WRAP_CONTENT)); } } 31 32 CHAPTER 1: Layouts and Views In this example, we have modified the APPEARING, DISAPPEARING, and CHANGE_DISAPPEARING transition animations for our Button layout. The first two transitions affect the item being added or removed. When the Add Item button is clicked, the new item horizontally rotates into view. When any of the Remove buttons are clicked, that item will vertically rotate out of view. Both of these transitions are created by making a new ObjectAnimator for the custom rotation property, setting its duration to the default duration for that transition type, and attaching it to our LayoutTransition instance along with a key for the specific transition type.
In order to apply this layout to the ListView, we will need to extend one of the ListAdapters in the SDK. Which one you extend depends on the data source you are presenting in the list. If the data is still just a simple array of strings, an extension of ArrayAdapter is sufficient. If the data is more complex, a full extension of the abstract BaseAdapter may be necessary. The only required method to extend is getView(), which governs how each row in the list is presented. In our case, the data is a simple array of strings, so we will create a simple extension of ArrayAdapter (see Listing 1-41).
Whenever possible, you should load your custom widget’s look and feel from the current theme to allow easy customization and consistency with the rest of your application. The constructor also creates a TextView and ImageView, and it places them inside the layout. Each child constructor is passed the same set of attributes so that any XML attributes that were set specific to one or the other (such as text or image state) are properly read. The remaining code sets the default display mode (either text or image) based on the data that was passed in as attributes.
Android Recipes A Problem-Solution Approach for Android 5.0 by Dave Smith