Android Recipes: A Problem-Solution Approach by Jeff Friesen, Dave Smith

By Jeff Friesen, Dave Smith

Android remains to be one of many top cellular OS and improvement structures riding today's cellular recommendations and the apps environment. Android appears complicated, yet deals various geared up improvement kits to these entering Android with differing programming language ability sets.

Android Recipes: A Problem-Solution procedure courses you step by step via quite a lot of helpful issues utilizing entire and real-world operating code examples.

during this ebook, you'll begin with a recap of Android structure and app basics, after which get all the way down to enterprise and construct an app with Google’s Android SDK on the command line and Eclipse. subsequent, you'll find out how to accomplish useful initiatives touching on the person interface, communications with the cloud, machine undefined, info endurance, communications among functions, and interacting with Android itself. eventually, you'll the best way to leverage a number of libraries and Scripting Layer for Android (SL4A) to assist you practice initiatives extra speedy, how one can use the Android NDK to spice up app functionality, and the way to layout apps for functionality, responsiveness, seamlessness, and more.

rather than summary descriptions of advanced options, in Android Recipes, you'll locate reside code examples. in the event you begin a brand new undertaking, you could give some thought to copying and pasting the code and configuration documents from this booklet, then enhancing them in your personal customization wishes. this may prevent loads of paintings over making a venture from scratch!

What you’ll learn

* become aware of Android structure and diverse Android-specific APIs
* find out how to improve a unit conversion app within the context of command-line/Android SDK and Eclipse/Android SDK environments
* easy methods to accomplish a variety of projects regarding the consumer interface and extra
* find out how to use exterior libraries to avoid wasting effort and time
* how one can fast increase an app utilizing the Scripting Layer for Android (SL4A) software
* how one can enhance app functionality through the use of the Android NDK
* directions for designing filtered apps, performant apps, responsive apps, and seamless apps

Who this e-book is for
newbies to Android, in addition to extra complete Android builders.

desk of Contents

* Getting all started with Android
* consumer Interface Recipes
* Communications and Networking
* Interacting with gadget and Media
* Persisting information
* Interacting with the process
* operating with Libraries
* Scripting Layer for Android
* Android NDK
* App layout instructions

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Java source file. This skeletal file’s contents are replaced with Listing 1–9. xml file. At the command line, specify ant followed by debug or release to indicate the build mode:  Debug mode: Build the app for testing and debugging. The build tools sign the resulting APK with a debug key and optimize the APK with zipalign. Specify ant debug.  Release mode: Build the app for release to users. You must sign the resulting APK with your private key, and then optimize the APK with zipalign. ) Specify ant release.

How It Works Your first step in creating UC is to use the android tool to create a project. apk filename when you build your app), all of the following options are required: 53 54 CHAPTER 1: Getting Started with Android  The --target (or -t) option specifies the app’s build target. The target_ID value is an integer value that identifies an Android platform. You can obtain this value by invoking android list targets. 3 platform target identified as integer ID 1.  The --path (or -p) option specifies the project directory’s location.

0;, or result = input*multipliers[position];. 4. setText(""+result);. There’s one more task for onCreate(Bundle) to perform: make sure that the Clear and Convert buttons are disabled when etUnits is empty. After all, there’s no point clearing an empty textfield, and parseDouble() throws an exception when attempting to parse an empty textfield. TextView’s void addTextChangedListener(TextWatcher watcher) method. TextView is EditText’s superclass. TextWatcher declares void afterTextChanged(Editable s), void beforeTextChanged(CharSequence s, int start, int count, int after), and void onTextChanged(CharSequence s, int start, int before, int count) methods.

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