By Dave Smith, Erik Hellman
Observe greater than a hundred down-to-earth code recipes, overlaying quite a lot of beneficial subject matters utilizing entire and real-world operating code examples. This e-book is up to date to incorporate the Android N SDK (7.0), in addition to prior releases. filled with insightful guide and valuable examples, this 5th variation of Android Recipes is your advisor to writing apps for one among today’s preferred cellular structures. It deals pragmatic suggestion to help you get the activity performed quick and good. this may prevent loads of paintings over making a venture from scratch. rather than summary descriptions of complicated options, in Android Recipes youll locate reside code examples. should you begin a brand new undertaking you could examine copying and pasting the code and configuration documents from this booklet after which editing them on your personal customization wishes.
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Additional resources for Android Recipes A Problem-Solution Approach
Full tablet layout in both orientations on a 10-inch tablet 37 Chapter 1 ■ Layouts and Views With the extensive capabilities of the Android resource selection system, the difficulty of supporting different UI layouts optimized for each device type is greatly reduced. 1-7. Placing Text over Images Problem Your application will display a series of photos of different scenes and colors, and you want to display a text overlaid on the ImageView. The color of the text must be changed according to the colors of the photo.
In all cases in which the tablet layout was referenced, we had to create only one layout file to manage, thanks to the power of using aliases. Now when we run the application, you can see how Android selects the appropriate layout to match our configuration. Figure 1-3 shows default and landscape layouts on a handset device. Figure 1-3. Handset portrait and landscape layouts 35 Chapter 1 ■ Layouts and Views The same application on a 7-inch tablet device displays the default layout in portrait orientation, but we get the full tablet layout in landscape (see Figure 1-4).
In this instance, however, we are inflating the top-level view of our activity, so we pass null here. Completely Custom Views Sometimes, the widgets available in the SDK just aren’t enough to provide the output you need. Or perhaps you want to reduce the number of views you have in your hierarchy by combining multiple display elements into a single view to improve performance. For these cases, you may want to create your own View subclass. In doing so, there are two main interaction points between your class and the framework that need to be observed: measurement and drawing.