By Dave Smith

Step via a variety of helpful issues utilizing entire and real-world operating code examples; includes greater than a hundred down-to-earth code recipes. This e-book is up to date to incorporate the Android 5.0 SDK, in addition to previous releases. rather than summary descriptions of complicated recommendations, in Android Recipes, you can find stay code examples. if you happen to begin a brand new undertaking you could examine copying and pasting the code and configuration records from this e-book after which editing them in your personal customization needs.

Crammed with insightful guide and important examples, this fourth version of Android Recipes is your consultant to writing apps for one among today’s most well-liked cellular structures. It bargains pragmatic suggestion that can assist you get the task performed speedy and good. this may prevent loads of paintings over making a venture from scratch!

Android remains to be one of many top cellular OS and improvement systems using trendy cellular suggestions and the apps environment. Android seems advanced, yet deals a number of 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 software info and percentage it among applications
  • Capture and play again a number of machine media items
  • Communicate with net services
  • Get the main from your consumer interface

Who this e-book is for

This ebook 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 equipment and Media

5. Persisting Data

6. Interacting with the System

7. images and Drawing

8. operating with Android NDK and Renderscript

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Additional info for Android Recipes A Problem-Solution Approach for Android 5.0

Sample text

SetAdapter(adapter); setContentView(list); } Adapting to a More Complex Choice Sometimes customizing the list rows means extending a ListAdapter as well. This is usually the case if you have multiple pieces of data in a single row or if any of them are not text. In this example, let’s utilize the custom drawables again for the background, but we’ll make the layout a little more interesting (see Listing 1-40). Listing 1-40. com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:padding="10dip"> CHAPTER 1: Layouts and Views This layout contains the same centered TextView but bordered with an ImageView on each side.

The count of all items is determined by summing up the counts in each section. This includes the header views, which the list treats the same as any other row. Traditionally, this means those items are also interactive and will transfer a click event to an attached listener. Since we don’t want this behavior for headers, we must also override areAllItemsEnabled() and isEnabled() to indicate to the view that headers should not be interactive. CHAPTER 1: Layouts and Views 55 Inside the getView() method, we are passed a view type that we can use to determine which type of view should be returned.

However, here we can use these callbacks to define a unique type for the header rows vs. the content rows. CHAPTER 1: Layouts and Views 49 How It Works Figure 1-6 shows a preview of the example list with section headers. Figure 1-6. Sectioned list We begin by defining a SectionItem data structure in Listing 1-42 to represent each section in our list. This item will house the title of the section, and the subset array of data to be listed under that heading. Listing 1-42. 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 ?

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