By Dave Smith, Erik Hellman
Observe greater than a hundred down-to-earth code recipes, overlaying quite a lot of beneficial issues utilizing entire and real-world operating code examples. This ebook is up to date to incorporate the Android N SDK (7.0), in addition to past releases. filled with insightful guideline and priceless examples, this 5th variation of Android Recipes is your consultant to writing apps for one in every of today’s most well liked cellular structures. It bargains pragmatic suggestion to help you get the task performed speedy and good. this may prevent loads of paintings over making a venture from scratch. rather than summary descriptions of advanced techniques, in Android Recipes youll locate stay code examples. for those who begin a brand new undertaking you could contemplate copying and pasting the code and configuration documents from this e-book after which editing them to your personal customization wishes.
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Extra info for Android Recipes A Problem-Solution Approach
1-6. Implementing Situation-Specific Layouts Problem Your application must be universal, running on different screen sizes and orientations. You need to provide different layout resources for each of these instances. 29 Chapter 1 ■ Layouts and Views Solution (API Level 4) Build multiple layout files, and use resource qualifiers to let Android pick what’s appropriate. We will look at using resources to create layouts specific to different screen orientations and sizes. We will also explore using layout aliases to reduce duplication in cases where multiple configurations share the same layout.
The view may report its size to be whatever it wants in this case. The size in this spec is often zero. Once you have done your calculations on what size to report, those values must be passed in a call to setMeasuredDimension() before onMeasure() returns. If you do not do this, the framework will be quite upset with you. Measurement is also an opportunity to configure your view’s output based on the space available. The measurement constraints essentially tell you how much space has been allocated inside the layout, so if you want to create a view that orients its content differently when it has, say, more or less vertical space, onMeasure() will give you what you need to make that decision.
Listing 1-21. com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" 26 Chapter 1 ■ Layouts and Views android:gravity="center_horizontal" android:orientation="vertical" >