Android Recipes A Problem-Solution Approach for Android 5.0 by Dave Smith

By Dave Smith

Step via quite a lot of beneficial themes utilizing entire and real-world operating code examples; comprises greater than a hundred down-to-earth code recipes. This ebook is up to date to incorporate the Android 5.0 SDK, in addition to prior releases. rather than summary descriptions of complicated innovations, in Android Recipes, you will find dwell code examples. in the event you commence a brand new undertaking you could think about copying and pasting the code and configuration documents from this ebook after which editing them in your personal customization needs.

Crammed with insightful guide and worthy examples, this fourth version of Android Recipes is your consultant to writing apps for one in all today’s most popular cellular structures. It bargains pragmatic recommendation that can assist you get the activity performed fast and good. this may prevent loads of paintings over making a venture from scratch!

Android is still one of many major cellular OS and improvement systems riding modern cellular techniques and the apps atmosphere. Android looks complicated, yet deals numerous prepared 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 program info and proportion it among applications
  • Capture and play again a number of machine media items
  • Communicate with internet services
  • Get the main from your consumer interface

Who this publication is for

This booklet is a convenient reference for all Android app builders.

Table of Contents

1. Layouts and Views

2. consumer Interaction

3. Communications and Networking

4. Interacting with gadget and Media

5. Persisting Data

6. Interacting with the System

7. photographs 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

Example text

Structure to Contain Each Section’s Data public class SectionItem { private String mTitle; private T[] mItems; public SectionItem(String title, T[] items) { if (title == null) title = ""; mTitle = title; mItems = items; } 50 CHAPTER 1: Layouts and Views public String getTitle() { return mTitle; } public T getItem(int position) { return mItems[position]; } public int getCount() { //Include an additional item for the section header return (mItems == null ? equals(mTitle); } return false; } } This structure will make the logic in our list adapter a bit easier to manage.

2, a new system based on the screen’s actual dimensions (in dp units) was introduced. With the new system, the following resource qualifiers are acceptable for physical screen sizes:  Smallest Width (resource-sw___dp): Screen with at least the noted density-independent pixels in the shortest direction (meaning irrespective of orientation)  A 640dp×480dp screen always has a smallest width of 480dp.  Width (resource-w___dp): Screen with at least the noted densityindependent pixels in the current horizontal direction  A 640dp×480dp screen has a width of 640dp when in landscape and 480dp when in portrait.

Again, as with the smaller tablets, using both smallest-width and bucket-size qualifiers ensures we are compatible with all tablet versions. 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. CHAPTER 1: Layouts and Views Figure 1-3.

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