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Expert Android Programming
Expert Android Programming

Expert Android Programming: Master skills to build enterprise grade Android applications

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Expert Android Programming

Exploring Android Studio Developer Tools

According to Statista, one of the leading statistical analysis agencies, designing a smartphone is ultimately a game of trade-offs: screen size vs. portability; battery life vs. data speeds; appearance vs. sturdiness; to name just a few. To make these trade-offs, it's important to know what the consumer wants.

Now that we know how to use Gradle, in this chapter we will discuss some of the tools that provide help in building apps and also help in debugging and performance tooling. We will discuss three important tools:

  • APK Analyzer: the tool to analyze the Android Application Package (APK) file
  • Battery Historian: shows the details of how the battery is used in the phone
  • Memory Analyzer: understanding memory patterns while using the app

APK Analyzer

An APK is an Android Application package file. Gradle, by default, builds a single APK, no matter what libraries you include. This compiled and packaged file includes all of the application's code (.dex files), manifest files, resources, and assets.

The library, within itself, comprises multiple copies of the same native code, optimized for the different architecture. This means that the library is a native binary with multiple architecture such as x86, x86_64, armeabi, and so on, all packed together. A developer can easily run the command unzip <your_APK_name>.APK to understand the content of an APK:

When your app, and the libraries it references, reaches a specific threshold, you encounter build errors that point to the app's limit of the Android App Build Architecture. The most recent Android build system displays an error, trouble writing output...

Understanding basic battery drain

Earlier editions of Android OS used to run on Dalvik Runtime, which means apps used to compile at execution time. Post-Lollipop edition, Android has switched to Android runtime (ART), which means the apps are compiled beforehand, ensuring they are launched faster. ART, as the runtime, executes the Dalvik Executable format and dex bytecode specification. Apart from the launch, the entire consumer experience using the app is essential for app retention. One important feature is the battery - a dear feature of the phone.

An app which is greedy for power often finds itself in the position of either being uninstalled or lower rated when reviewed on the Google Play Store listing. Take a look at some of the most popular apps on the Store, including Facebook, which has had consistently bad reviews that quote battery drain as one of the top sources of...

Batterystats and Battery Historian

The Android Settings menu options provide high level measurements of battery drain. However, to gain more insight into battery consuming apps, there are some tools that can be useful. Tools such as Batterystats and Battery Historian come in handy. Batterystats collects battery data from your device, and Battery Historian converts that data into a HTML visualization that helps you understand power consumption graphically.

Batterystats, was introduced in KitKat, but Lollipop brought a large dataset for the users which included data about every Wakelock action on the device.

Please reset the data and enable full Wakelock reporting to receive comprehensive information including how the device utilizes the battery, along with details about all the running processes.

Here are some of the commands you can run after connecting your device:

adb shell...

Memory Monitor

When you hear the term memory management in an Android app, it is basically the Random Access Memory (RAM). Managing the RAM is the most critical section in the Android app development process, as the physical memory is often constrained. The fundamental principle of memory management is to avoid a memory leak from your app.

In Android Studio there is a tool we can use to check the memory usage in the App. To check this you could follow these steps:

  1. Run your app on an Android device connected to an emulator.
  2. Open the Android Monitor tab in Android Studio situated at the bottom window.
  3. Open the Monitor section within it, and you are there.

Here you'll be able to continuously check the memory usage of the app as and when the app is being used. The following image shows the memory usage for an app:

The preceding memory graph shows the memory used by a device...

Summary

Battery life is an excellent indicator of how your App performs. Apps without optimization can severely impact the battery life of a device. We've walked though in-depth analysis of battery drain in Android Apps. We also looked at Batterystats and the Historian tool to analyse battery usage patterns. Additionally, we explored memory optimization to ensure the app runs smoothly and stays off the memory leaking track.

In the next Chapter 3, Leap into the Android Support Library we will discuss Android Support Libraries.

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Key benefits

  • -Dive deep into Android development with practical hands on examples to help you in each stage.
  • -Develop smart professional grade apps for the latest Android N version and become a pro android developer.
  • -Unclog your development highway by utilising the industry standard best practices techniques.

Description

Android O brings a number of important changes for the users as well as the developers. If you want to create smart android applications which are fast, lightweight and also highly efficient then this is the book that will solve all your problems. You will create a complex enterprise grade app in this book. You will get a quick refresher of the latest android SDK and how to configure your development environment. Then you will move onto creating app layouts, component and module building, creating smart and efficient UIs. The most important part of a modern day app is how real time they are. With this book, you will create a smooth back-end for your app, ensure dynamic and real time communication between different app layers. As we move on, you will learn to leverage the different Android APIs and create an efficient SQLite data layer for your apps. You will implement effective testing techniques to make your app reliable and robust and finally you will learn to deploy it efficiently. The multiple stages of android development will also be simplified by giving you an industry standard set of best practices.

Who is this book for?

This book is for mobile developers having some expertise in building android apps and who wish to now take a leap into building complex app such as Zomato, using latest Android N power of Google.

What you will learn

  • ? Building UI/UX following best industry practices
  • ? Development of Zomato Clone
  • ? Measure and improve app performance
  • ? Improving app using test mechanisms
  • ? Bringing the app live on the play store
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Publication date : Sep 29, 2017
Length: 404 pages
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Language : English
ISBN-13 : 9781786468956
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Table of Contents

16 Chapters
Understanding the Gradle System Chevron down icon Chevron up icon
Exploring Android Studio Developer Tools Chevron down icon Chevron up icon
Leap into the Android Support Library Chevron down icon Chevron up icon
Google Play Services Chevron down icon Chevron up icon
Material Design Chevron down icon Chevron up icon
SOLID Android Development and Its Design Principles Chevron down icon Chevron up icon
Understanding MVC, MVP, MVVM and Clean Arch Patterns Chevron down icon Chevron up icon
Decision Making Chevron down icon Chevron up icon
Performance Matters Chevron down icon Chevron up icon
Building Restaurant finder Chevron down icon Chevron up icon
Backend Service Chevron down icon Chevron up icon
App Quality Service Chevron down icon Chevron up icon
Grow Up Chevron down icon Chevron up icon
Testing Chevron down icon Chevron up icon
Preparing for Google Play Chevron down icon Chevron up icon
Understanding App Store Analytics for Optimization Chevron down icon Chevron up icon

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