By Dave Smith, Erik Hellman
Discover greater than a hundred down-to-earth code recipes, overlaying quite a lot of helpful themes utilizing entire and real-world operating code examples. This publication is up-to-date to incorporate the Android N SDK (7.0), in addition to prior releases.
Crammed with insightful guide and priceless examples, this 5th version of Android Recipes is your consultant to writing apps for certainly one of today’s most well liked cellular structures. It bargains pragmatic suggestion to help you get the task performed quick and good. this may prevent loads of paintings over making a venture from scratch.
Instead of summary descriptions of advanced strategies, in Android Recipes you can find reside code examples. if you begin a brand new venture you could ponder copying and pasting the code and configuration records from this publication after which enhancing them on your personal customization wishes.
What you will 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 program info and percentage it among applications
- Capture and play again quite a few gadget media items
- Communicate with internet services
- Get the main from your person interface
Who This ebook Is For
All Android app developers.
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Extra info for Android Recipes: A Problem-Solution Approach
Listing 1-13. WRAP_CONTENT)); //Attach the view to the window setContentView(layout); } In this instance, the XML layout is inflated in the activity code with a LayoutInflater, whose inflate() method returns a handle to the inflated View. inflate() returns a View, we must cast it to the specific subclass in the XML in order to do more than just attach it to the window. ■■Note The root element in the XML layout file is the View element returned from LayoutInflater. inflate(). 15 Chapter 1 ■ Layouts and Views The second parameter to inflate() is the parent ViewGroup, and this is extremely important because it defines how the LayoutParams from the inflated layout are interpreted.
Tying It Together Let’s look at a quick example that puts this into practice. We’ll define a single activity that loads a single layout resource in code. However, this layout will be defined differently in the resources to produce different results in portrait, in landscape, and on tablet devices. First, the activity is shown in Listing 1-24. Listing 1-24. main); } } 31 Chapter 1 ■ Layouts and Views We’ll now define three separate layouts to use for this activity in different configurations. Listings 1-25 through 1-27 show layouts to be used for the default, landscape, and tablet configurations of the UI.
0. Light: (API Level 11) Theme that uses an inverse color scheme and that has an action bar by default. 0. DarkActionBar: (API Level 14) Theme with an inverse color scheme but a dark solid action bar. 0. Light: (API Level 21) Theme with a simplified color scheme governed by a small palette of primary colors. This theme also supports tinting of the standard widgets using the supplied primary colors. 0. DarkActionBar). xml file. Listing 1-5. > ... Custom Themes Sometimes the provided system choices aren’t enough.
Android Recipes: A Problem-Solution Approach by Dave Smith, Erik Hellman