Earlier than You Start
This part tells you just a few issues you’ll want to know earlier than you get began, corresponding to what {hardware} and software program you’ll want, the place to seek out the venture recordsdata for this e book and extra.
Part I: Growing Actual World Apps
On this part, you’ll learn to design and implement PetSave for example of knowledgeable, actual world app. You’ll learn to select the correct architectural sample and the right way to construction the code to make the app testable and maintainable.
To make your app simpler to alter, it’s an excellent apply to outline totally different layers with particular obligations. Specifically, you’ll learn to design and implement the area layer for the PerSave app. You’ll additionally see the right way to entry the community effectively, by implementing the repository sample within the information layer.
On the finish of this part, you’ll have a transparent concept about the right way to construction the code of your app.
The Android platform is greater than 10 years outdated and the variety of frameworks, libraries and instruments you should utilize to develop your app are numerous. This e book covers the applied sciences and practices you’ll want to observe in the true world if you wish to create a profitable Android app.
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Constructing Android apps is not only a matter of writing code. You additionally want to make use of the perfect structure and construction your recordsdata in a manner that makes it simple to use modifications. Maintaining excessive cohesion and low coupling is simply one of many fundamental rules you will study on this chapter, the place you will begin engaged on the PetSave app.
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The area layer is a group of entity objects and associated enterprise logic, designed to characterize the enterprise mannequin of any app. Right here, you will study what a site layer is and the right way to create an excellent one. You may see the variations between entity and worth objects together with the benefits of utilizing the repository abstraction. Lastly, you will take a look at the area logic of your app.
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Each helpful app permits customers to entry info that is both saved regionally or fetched from the community. That is what an information layer helps you do. On this chapter, you will study what the info layer is and what selections you’ve gotten if you want one. You may be launched to the repository sample and learn to implement it from the design to the testing part.
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Most apps entry information from the community, which introduces totally different sorts of issues, like latency and connectivity prices. To enhance efficiency and scale back prices, it is a good apply to retailer information regionally. Due to this fact, you’ll want to implement the repository sample as a cache or easy native retailer. On this chapter, you will learn to implement and take a look at the repository sample within the PetSave app utilizing Room and Hilt.
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PetSave permits customers to seek out animals near them primarily based on sure standards. There are a number of architectural design patterns you should utilize to create this characteristic. Right here, you will use MVVM and Unidirectional Information Movement to implement the “Animals Close to You” characteristic. You may even have the chance to learn to use elementary libraries like StateFlow, ViewModel and ViewBinding.
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PetSave’s fundamental characteristic is to allow you to seek for pets primarily based on sure standards. On this chapter, you will use a top-down strategy to implement the search, from defining the UI to fetching the info.
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Part II: Modularizing Your App
As you add new options to your app, the code turns into extra complicated and troublesome to keep up. Because of this, it’s essential to separate your app into totally different libraries to make your code each maintainable and reusable. This additionally improves the app’s construct time, which is an important metric in your CI.
On this part, you’ll learn to cut up your app into totally different modules. Specifically, you’ll learn to use the dynamic characteristic choice, which optimizes the dimensions of the code your customers need to obtain to make use of your app.
Modularization is likely one of the most difficult issues you face with huge apps. Splitting the app into totally different modules permits you to scale back construct time whereas creating code you possibly can reuse in different apps. On this chapter, you will learn to create a characteristic module for PetSave, specializing in the navigation.
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This chapter covers the basic ideas of dynamic options. Dynamic options allow you to cut up the app into totally different modules to scale back the APK dimension and the obtain time and value.
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Cell apps, particularly video games and apps with plenty of graphic property, typically have massive APKs. Google’s dynamic characteristic choice permits you to hold your app modern by splitting it into components that customers can load if and once they really want them. On this chapter, you will learn to use dynamic options to put in PetSave extra effectively.
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Part III: Enhancing Your UI
The consumer interface (UI) is likely one of the most essential elements of any actual world app. How your consumer interacts with the options of your app is what decides if the app is profitable or not.
Once you construct your app, you’ve gotten three choices for creating your UI. More often than not you’ll use what the Android SDK offers. In different instances, you customise the present parts. Your third choice is to create your individual customized parts.
On this part, you’ll learn to improve the consumer interface of your app. You’ll create and customise animation utilizing the brand new Animation Editor, which comes with current variations of Android Studio. You’ll additionally learn to grasp themes and kinds and to create a customized view.
After studying this part, you’ll have a extra interesting app and happier customers.
Animations are important to creating your app each simple and nice to make use of. The Android platform offers a number of APIs to implement several types of animations. On this chapter, you will learn to use each physics-based and Lottie animation.
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Implementing animation within the Android platform may be troublesome and time-consuming. It is crucial to make use of the correct device. In current releases of Android Studio, the Movement Editor permits you to implement several types of animations in a easy and declarative manner. On this chapter, you will learn to use Movement Editor and the right way to combine MotionLayout into your app.
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The Android platform offers totally different normal parts you should utilize to create the UI in your app. More often than not, they’re sufficient. Typically, as within the PetSave app, you want one thing customized. To create customized UI components, you employ the customized view, which you will study all about on this chapter.
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Android offers kinds and themes to customise the feel and appear of the UI parts of any app. They can help you utterly change any facet of the UI of your app in a declarative manner by offering a easy XML file. On this chapter, you will see the right way to customise a UI that makes use of normal parts and the right way to use kinds and themes with a customized view.
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Part IV: Securing Your App
Making your app safer is a side of improvement that’s typically ignored, however, on the similar time, is totally important. Think about what would occur if any individual would hack your code, stealing essential information and even the usernames and passwords of your customers. That may be a catastrophe.
On this chapter, you’ll learn to deal with safety from totally different factors of view. You’ll learn to shield consumer information and the right way to securely connect with a server. Lastly, you’ll learn to make hackers’ lives harder, by utilizing totally different strategies to guard your code and your information.
On this chapter, you will study greatest practices for securing an Android app. You may see the right way to take care of permissions and the right way to forestall the most typical safety dangers.
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Accessing information from native storage has safety implications, so Android offers totally different APIs and instruments to keep away from undesirable entry to your information. Right here, you will learn to make your app safer by encrypting and decrypting information and by utilizing biometrics to implement the consumer login.
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On this chapter, you’ll study to safe the community connections of your app by utilizing HTTPS for community calls, trusting a reference to certificates pinning and verifying the integrity of transmitted information.
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Any cellular app may be weak to several types of assaults from hackers. It’s normal to examine hackers breaking apps and stealing essential info. Due to this, avoiding code vulnerability and validating the enter from the consumer are crucial subjects. On this chapter, you will learn to use among the most essential strategies to make your app troublesome to hack.
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Part V: Sustaining Your App
Once you’re creating your actual world app, you would possibly suppose that publishing is your finish purpose. However actually, your work isn’t over simply since you’ve launched your app. You continue to want to know in case your app is working correctly and what issues your customers are experiencing.
On this part, you’ll study all the pieces you’ll want to find out about sustaining and controlling your app after it’s printed and out there to customers. Specifically, you’ll learn to use Firebase for logging crashes, the right way to allow or disable sure options and the right way to use A/B checks to know what resolution is the perfect in your customers.
Lastly, you’ll see the right way to optimize your app’s dimension and the right way to use Android Studio as a profiling device.
After studying this part, you’ll be prepared to make use of all of the out there instruments for bettering your app’s high quality.
Firebase is a robust device to handle essential elements of your app. Right here, you will see the right way to use Crashlytics to observe crashes and errors. Then, you will see the right way to use Distant Config to regulate your app remotely. Lastly, you will learn to use Take a look at Lab to check your app on a variety of units.
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Once you construct an app, it is not sufficient to implement its options and run checks. You additionally have to spend time bettering your app’s high quality by means of optimization. For instance, decreasing the APK’s dimension is essential to assist outdated units and customers with sluggish web connections. On this chapter, you will learn to optimize your app earlier than launch.
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Once you implement an app or attempt to repair a bug, you want some instruments to test what’s occurring. For instance, you expertise a crash and do not know why, otherwise you obtain invalid info from the community and have to test the info. This chapter comprises all the pieces you’ll want to find out about debugging, from reminiscence to community, from battery utilization to the definition of the UI and far more.
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Typically, your app has issues and you do not know why. To unravel the issue, you’ll want to do some deep investigation, not simply into your code but in addition into code you imported from third-party libraries. In different instances, the issue is not the code, however a corrupted file or database. On this chapter, you will learn to study the bytecode of your app and the recordsdata it makes use of to seek out bugs and safety issues.
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