android应用开发Android development is all the hype these days as it continues to dominate the world of mobile development. Fun projects, great pay, and tons of job prospects are just some of the ...
Android development is all the hype these days as it continues to dominate the world of mobile development. Fun projects, great pay, and tons of job prospects are just some of the reasons developers are starting their journeys into the exciting world of the Android operating system. Some experts say that there has never been a better time to learn Android skills, especially since the recent updates, like the addition of Kotlin and improvements to Google’s policies.
If you’ve been thinking about starting your Android journey or you’re just curious about what Android has to offer, you’re in the right place! Today we will walk you through all the basics of Android development and even show you how to build your own functioning application.
Resources for Android app development Android应用开发资源
什么是Android？ (What is Android?)
Android is one of my world’s most popular operating systems for everything from 5G mobile devices to mobile apps to touchscreen smartphones and tablets. This open-source, Linux-based software is used by Google to power over 2.5 billion devices worldwide, accounting for over 80% of smartphone sales.
Android is based on the Linux kernel, which means that the basic operating structure is portable, multi-user, and able to handle complex multitasking. One of the biggest advantages of Android is the freedom of choice that comes with the technology. Not only is the hardware more diverse, but the software is very flexible and customizable.
The market for Android development is growing as more and more manufacturers, including Samsung, Lenovo, HTC, and LG, turn to Android to power their products. This means that there’s a huge demand for Android developers worldwide in diverse industries and companies! On top of that, the new Google Play Store policies are the app development market much more lucrative. Learning Android skills will open doors and make you a desirable developer across the board.
Getting started as an Android developer is easier than you might think; you’ll need to master some basic skills and tools, such as:
Programming language skills (Java, Kotlin, and Groovy) 编程语言技能(Java，Kotlin和Groovy)
Android build system Android构建系统
Android Studio IDE Android Studio IDE
编程语言技能 (Programming Language Skills)
There are three programming languages and one markup language used in Android development.
Java is the official language for Android development and one of the most popular programming languages in the world. Java classes run on Android Runtime (ART), a specialized virtual machine. Take a look at this example from the Android MainActivity.java file.
Kotlin has been the second official language for Android development since 2017. Known for being much more concise and expressive, Kotlin helps alleviate some of Java’s drawbacks. Here’s an example of the above code in Kotlin so you can compare.
XML, a markup language, is commonly used in Android development to declare a layout for user interface (UI), dimensions, and strings. Take a look at this example of a layout that shows text in the middle of the user’s screen.
Gradle powers the Android build automation system and expands upon the concepts of Apache Maven and Apache Ant by introducing a Groovy-based, domain-specific language. Groovy is an optionally typed, dynamic language with static-typing capabilities. It helps improve productivity and speed by integrating with your Java-based program. With Groovy’s ease and Gradle’s mature ecosystem, you can automate your software and deliver much faster builds.
The Android Studio IDE is your new best friend for Android development. Based on IntelliJ IDEA, it’s the official development environment for Google’s operating system. It comes with great Android-specific tooling to cover all your needs. Using this IDE will accelerate your development time, and frequent updates mean you’ll never fall behind. It comes loaded with the following features, amongst many others:
Android Studio IDE是您进行Android开发的新最好朋友。 它基于IntelliJ IDEA，是Google操作系统的官方开发环境。 它带有出色的Android专用工具，可以满足您的所有需求。 使用此IDE将缩短您的开发时间，并且频繁的更新意味着您永远不会落后。 它具有以下功能，以及许多其他功能：
Realtime profilers and analyzer 实时分析器和分析器
Flexible build system 灵活的构建系统
Intelligent code editor 智能代码编辑器
Visual layout editor 视觉布局编辑器
Fast emulator 快速模拟器
Android SDK (Android SDK)
The Android SDK is the official development kit for Android app development. It is composed of modular packages that can be separately downloaded from the Android SDK Manager, including SDK tool, Google API, Android support, Android Debug Bridge (ADB), and more. Just like the IDE, the Android SDK is always being updated. New releases will keep you up to date with the latest features.
When it comes to creating Android apps, your knowledge of Java is paramount to your success. Java is the official language for developing Android applications, and it supports all of the Android tools. Knowledge of this language will make your dev experience much easier.
Java was chosen for Android development because it is well-known, well-supported by development tools, and already pervasive in the mobile phone industry. On top of that, Java runs in a VM, so it doesn’t need to be recompiled.
To get started with Android development, you need to install the Android Studio IDE. This user-friendly, drag-and-drop interface is the official IDE development environment. It is purpose-built for high-quality Android apps. This IDE will speed up your development time and make your apps far more reliable and easier to update when new features are released.
要开始进行Android开发，您需要安装Android Studio IDE。 这个用户友好的拖放界面是官方的IDE开发环境。 它是专为高质量Android应用而构建的。 此IDE将加快您的开发时间，并在发布新功能时使您的应用程序更加可靠并且更易于更新。
To install Android Studio on Windows, follow these steps.
Visit this link to get the latest version of Android Studio.
You can either download the IDE as a .exe file or a .zip file. For the .exe file, double click the file to launch it. For the .zip file, unpack the ZIP and copy the android-studio folder to your Program files.
The settings.gradle file contains a list of your modules and project name. Keep in mind that an Android project can consist of one or several modules, which can each contain their own feature or logic. The gradle.propertiesfile defines your settings and configures a build environment.
package - the package name of the application, in our case com.travelblog
theme - the global application theme, in our case MaterialComponents theme
label - the label which is used as a value for the application icon
activity - the activity, we currently only have one MainActivity
All resource-related files need to be placed inside predefined, sub-folders of the src/main/res folder. One subfolder, for example, is the layout folder for all your layout files. We will also have the src/main/java folder for our Java source code.
所有与资源相关的文件都必须放置在src / main / res文件夹的预定义子文件夹中。 例如，一个子文件夹是所有布局文件的布局文件夹。 我们还将为Java源代码提供src / main / java文件夹。
第2步：Android库 (Step 2: Android Libraries)
An important part of creating your application is the unique features and tools you add to it. That’s where libraries come into play. A library is a collection of pre-written resources that can be added to your app. The Android library ecosystem is large, and you can use dozens of libraries in a single project. You can access most of the Android libraries through maven.
Here are some of the most popular libraries in use today:
appcompat — makes the apps developed with newer versions work with older versions
constraintlayout — allows creating large and complex layouts with a flat view hierarchy
material — brings material design components to Android
retrofit — a type-safe HTTP client library
moshi — a JSON parser library
moshi — JSON解析器库
glide — an image loading library
room — an official Android ORM database
室 —官方的Android ORM数据库
dagger — a static, compile-time dependency injection framework
The appcompat library is great for solving compatibility issues between newer and older versions of your app. Its primary component is AppCompatActivity. This base class enables backward compatibility with older versions of Android apps. To add it to your app, use the following code:
This library brings Material Design components to your app. Material design is a design language used to make your various components more user-friendly. You can take a look at the list of components here. To add it to your app, use the following code:
One of the core components of Android is activity, one screen of the application user interface. An application is comprised of multiple activities that can be launched on top of each other to form a back stack. A user can navigate through this back stack using the UI components, i.e. a back button.
For example, an app may have the following components:
LoginActivity — represents login flow
ListActivity — represents a list of recent article titles
DetailActivity — represents an article itself
Activities have their own lifecycles, so the Activity class offers six core callbacks: onCreate( ), onStart( ), onResume( ), onPause( ), onStop( ), onDestroy( ). When the user leaves an activity, the system will dismantle the activity by calling different methods. You can use these methods to check when an activity is being created or destroyed, becomes visible or hidden, etc.
Creating an activity involves two main steps: make a Java class and extend it from the Activity superclass. You could then use the library AppCompatActivity to achieve backward compatibility. Android activities must then be declared in the AndroidManfiest.xml file.
Another key aspect of Android development is developing and working with Android layout. The layout defines the overarching structure of your UI (user interface). These are built using views and view groups.
ViewGroups, sometimes called layouts, are like invisible containers that determine where certain elements will be housed. This is where you might use the Google library ContraintLayout, which uses constraints to position your widgets. The Android SDK method is simpler for beginners but offers less flexibility.
Secondly, we need to fill our empty layout by defining a child view. In this case, we will define static text that reads “Hello World”. To do so, we use a TextView and the text attribute. We will use wrap_content so the view will take up as much space as possible.
Now that we’ve built our views, we move onto alignment. We want to move our text to the center of the screen since the default positions our views in the upper left corner. To do so, let’s add the following constraints:
Now that everything is aligned where we want it, we move onto layout binding. This serves to associate activity_main.xmllayout with the MainActivity. We do this using the setContentView method when an activity is created inside the onCreate method.
The method setContentView accepts the layout resource ID. This is referenced by the auto-generated Android R class, where all the resource IDs are stored. For binding purposes, we can use the R.layout.activity_mainto obtain the ID of activity_main.xml so we can tell MainActivity to render layout from this file.
Now you know the basic build and layout process for an Android application! It’s time for you to get started on your own! In the next section, we’ll walk you through some important resources to get you started.
是否想立即开始Android开发？ (Want to get started with Android development right now?)
One of the best resources out there for developers of all levels is Modern Android App Development with Java, a hands-on, project-based course that walks through every stage of development. As you learn, you’ll build a fully functional Travel Blog Application.
On top of that, the course comes with Educative’s unique pre-configured Android environment, so you don’t have to download anything to get started. It’s one of the only courses out there with this powerful widget!
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).
If you are at all familiar with mobile development, you will likely see how this is useful. If your app interacts with a REST API, you can debug each of your outgoing requests and incoming responses. Charles will snoop your app’s network communication and output every detail of your request including the URL, method, headers, or request body as well as the raw JSON data returned from the server. This is the single source of truth of your app’s network communication and it makes network debugging a breeze. It’s also a great way to prove to your back-end developer that a bug is their fault by sending them the a raw curl command of your network request 😏:
Are you tired of Vysor and its annoying ads and its blurry screen mirroring? Say hello to scrcpy. This easy-to-install, lightweight and speedy application uses your Android device’s already established USB connection to mirror its screen on your desktop. It is open source, completely ad-free and does not require any root access. Interacting with your real device through this mirrored display is an emulator-like experience as it has very little response delay. The image quality has a high frame rate and is very crispy:
If you are familiar with front-end web development, you can appreciate the convenience of the Inspector in your modern browser which lets you explore your HTML code as you hover over elements on a page. uiautomatorviewer brings the same convenience to the Android world. This tool lets you take UI XML snapshots of what you are currently vieweing on your device. This is of course an alternative to Android Studio’s built-in Layout Inspector, but I have personally found this tool to be faster, simpler, and more reliable.
android开发人员要求An Android Developer is somebody who creates our lives simple by creating a corresponding desktop or mobile programs that help us in our daily pursuits. Consequently, if you ask who...
An Android Developer is somebody who creates our lives simple by creating a corresponding desktop or mobile programs that help us in our daily pursuits. Consequently, if you ask who exactly is the Android Developer, I’d say, he’s a Software Developer who specializes in designing software for the Android market. This usually means that the function of an Android Developer within a business is to produce software with respect to exactly what domain your organization works on. He/she can produce simple applications in addition to complex ones such as gambling programs (PUBG, Candy Crush, Word Cookies, etc). As an Android programmer, you have to be very clear about your job posting and your own responsibilities. So, I’ve noted down a couple of important functions and obligations of an Android Developer. Take a look! These functions and responsibilities specify who could be a successful programmer. You need to build and layout Android software Should function in conjunction with the layout and the testing staff so as to produce better products with fewer bugs learn how to utilize different API and information sources understand. How to fix bugs Constant evaluation, finding new technology, and exploiting then the next question is why to pick the function of an Android Developer when you’ve got so many other advancement job functions. Let us see what would be the significant reasons to develop into an Android Developer.
There are many reasons why you need to go to get Android Development. Permit Android is an open-minded system hence it lessens the package licensing price that adds up on into the very low cost and higher ROI (Return on Investment). They have a huge community that lets you directly interact with the programmers themselves in the event of problems or potential variations. Programs that are made are gaining a great deal of popularity or are ranked high on the google play shop. Google keeps altering certain functionalities and discharging the new models every now and then. Therefore, you get upgrades on a regular basis that include improvised features that are added to your program. Additionally, this is a challenging task to develop, something which may catch the attention of any consumer. It’s easy to embrace If you’re working on any tech such as Software Testing, Complete Stack Development, you’d find it simple to understand how Java programming language that’s one in most of the handiest languages used to create software. It’s also a fact that any user with peer knowledge on Java can quickly create an Andriod program. Simple to learn programmers out there will surely feel the time spent in learning how to create an Android program is relatively less than that which they spend on different technologies. Have an understanding of Java and scripting languages such as Perl, PHP, and the task is finished. Then let us talk Job functions. Who can develop into an Android Developer?
谁现在是Android开发人员？ (Who is now an Android Developer?)
Android Software Programmers can stick to a simple pathway to be an effective Android Developer because they already have some idea about how the software work. But if you are a newcomer and wish to Construct a profession in Android Program Development, it is possible to take up the Android Development Training provided at Edureka.To acquire a more in-depth comprehension of how to develop into an Android Developer, you can take a look at this movie by our subject-matter pros. Android Tutorial It’s excellent for both novices and professionals that wish to learn or brush up the fundamentals of Android. Now, let us take a look at the project tendencies. Android program development is on the Forbes’ listing of their most-wanted tech abilities in 2019. It’s just one such technology that features multipurpose job chances. So to catch a few handfuls of tasks on Android Development tasks by having a peek at the project tendencies. It is possible to observe the Android programmer jobs have a tollfree. It’s becoming among the highest leaders in the industry today. Since the industry demand is increasing for Android, mobile application development is growing in India. Programmers having the wisdom and expertise will tote a wonderful bundle within this business. There are roughly 25,000 openings for Android mobile software development in India, this amount indicates a massive amount of growth within this business. Speaking about the salary obtained by an Android Developer, have a look at this chart. Based on Glassdoor, to get a Younger, the true salary is near 4LPA also it keeps growing with the number of years of expertise. And also, since the number of job vacancies is far somewhat more, the wages can also be pretty damn good. This chart below shows the wages tendency in 2019. See the gain in the median salary obtained. It’s near 65,000 Euros annually that’s quite a great deal of cash. Now you have known who’s an Android Developer and exactly what the occupation trends and wages, let us move on, and have a peek at just how precisely you are able to turn into an effective Android Developer.
如何成为一名有效的Android开发人员？ (How to Be an effective Android developer?)
you need to be well-versed in various themes under Android Development such as the skillset. Below are a couple of noteworthy skills which you ought to master to be able to bag the function of an Android Developer. Must have a strong understanding of Android SDK and distinct variations of Android. Decent understanding with SQL. Proficient comprehension of code versioning tools, for example, Git. Familiarity using RESTful APIs that links Android programs to backend services. Have the capacity to design software around UI for example touch. Familiarity with constant integration. Mastering these skills will surely help you develop as a fruitful Android Developer. And also do notice that Android is just one such domain where occupations are not out of stock. So begin now to become a wonderful programmer. So for this, we arrive at the conclusion of the article on” How to become an Android Developer”. I hope you’re clear with all the topics which are covered within this blog and prepared to begin your search to become an Android Developer. In case you haven’t already begun your groundwork yet, it is wise to start straight away. You could even register in one of Edureka’s certificate program to quick-start your understanding. Have any questions? Do not forget to mention these in the remarks. We’ll return to you.