App! App.
App
Ti o ba n wa ọna lati kọ ẹkọ bi o ṣe le ṣe eto ohun elo Android kan, lẹhinna o yẹ ki o ronu gbigba ikẹkọ Awọn ohun elo Android Appmieren. Awọn iṣẹ ikẹkọ wọnyi jẹ pipe fun awọn olubere, bi wọn ko nilo eyikeyi iriri ṣaaju tabi lẹhin. Iwọ yoo kọ ẹkọ Java, Kotlin, Fa-ati-ju, ati Intents. Lẹhin ipari ẹkọ yii, o yoo ni a okeerẹ oye ti Android siseto. Sibẹsibẹ, o yẹ ki o mọ diẹ ninu awọn aaye pataki ṣaaju ki o to bẹrẹ iṣẹ-ẹkọ yii.
Ti o ba nifẹ lati kọ awọn ipilẹ ti ohun elo Android app programmieren ni Java, iwọ yoo nilo imọ to dara ti ede naa. Java jẹ ede siseto ti o gbajumo julọ fun Android ati pe o jẹ ede ayanfẹ fun ṣiṣẹda awọn ohun elo alagbeka. Ẹkọ yii ni wiwa awọn ipilẹ Java ati ṣafihan Eto-Oorun Ohun. Iwọ yoo tun kọ ẹkọ bi o ṣe le ṣiṣẹ pẹlu ile isise Android, ohun elo idagbasoke ohun elo olokiki kan. Nigba ti dajudaju, iwọ yoo ṣẹda iṣẹ akanṣe Android kan ati ṣawari awọn ipilẹ ti ṣiṣẹda ohun elo Android kan.
Nigba ti idiwon ọna ti Android app programmieren ni Java jẹ gbajumo re, wọn tun ni opin pupọ ninu awọn agbara wọn. Lakoko ti ọna yii jẹ doko fun ṣiṣẹda awọn ohun elo Android ti o rọrun, iwọ yoo ni lati yi koodu Java pada ti o ba fẹ ṣafikun awọn ẹya diẹ sii. Iwọ yoo nilo lati kọ Java daradara, ati pe kii ṣe fun gbogbo eniyan. Pupọ julọ awọn alakoso iṣowo jade lati bẹwẹ oludasilẹ ohun elo Android amọja lati ṣiṣẹ lori awọn ohun elo wọn.
Ti o ba jẹ oluṣeto Android to ti ni ilọsiwaju, o le lo Async-Task-Framework ati lo Awọn ero lati fi awọn iṣẹ-ṣiṣe ṣe. O tun le lo eto iwọle si Studio Studio lati jẹ ki ohun elo Android rẹ jẹ ọfẹ. Ati pe iwọ yoo ni idunnu pe o ṣe ti awọn ohun elo rẹ ba ṣiṣẹ bi a ti pinnu. Kan rii daju pe o ṣayẹwo eto gedu ṣaaju fifiranṣẹ wọn si ọja app.
Ti o ba n gbiyanju lati kọ ohun elo Android kan, o le ronu nipa lilo Kotlin. Ede siseto tuntun yii fun awọn ohun elo Android jẹ yiyan nla nitori irọrun rẹ. Irọrun rẹ jẹ ẹya bọtini lati tọju ni lokan, bi kikọ Kotlin le nira. Sibẹsibẹ, ni kete ti o ti ni oye awọn ipilẹ ti Java, iwọ yoo nifẹ ṣiṣẹ pẹlu Kotlin. Ko nikan ni o ṣe aye re rọrun, ṣugbọn o tun jẹ ailewu ati agnostic Syeed.
Ohun elo Android-App ni awọn iṣẹ ṣiṣe lọpọlọpọ, ọkan fun kọọkan iboju. Lẹhin ti pari iṣẹ-ṣiṣe kan, o lọ si ekeji. Iṣe akọkọ ninu ohun elo jẹ Iṣẹ-ṣiṣe Main, eyiti o jẹ kilasi Java ati ipin-kekere kan ti iṣẹ ṣiṣe kilasi Android ati AppCompatActivity. O jẹ aaye titẹsi fun app ati pe o ni awọn ọna aimi akọkọ ninu() ati lori Ṣẹda().
Lẹhin ti o kọ awọn ipilẹ ti Kotlin, o yẹ ki o ronu bi o ṣe le ṣe agbekalẹ ohun elo Android kan nipa lilo rẹ. Ọpọlọpọ awọn orisun lo wa lati kọ ẹkọ bi o ṣe le lo Kotlin fun Android, ati pe o le paapaa tẹle pẹlu iṣẹ akanṣe kan. Ẹkọ ọfẹ ti o lo ọna ti o da lori iṣẹ akanṣe ṣe iranlọwọ fun ọ lati ṣe idagbasoke awọn ọgbọn Kotlin rẹ. Lati ni imọ siwaju sii, ṣayẹwo awọn iṣẹ ikẹkọ ti Google tabi Udacity funni.
Lati ṣe fa-ati-ju silẹ ninu ohun elo Android rẹ, you need to know the details about how the drag-and-drop mechanism works. Drag-and-drop events can be triggered by any device by triggering a user trigger, and the Android framework provides a drag event class and drag listeners for each action. The drag process is very simple: the source app triggers the drag event by sending a startDrag() callback to the system. This callback then provides drag data to the system. After handling the drag, the source app can call the drop event to check if it has been successful.
The Android drag-and-drop framework allows users to move data between multiple objects in an Activity layout. The drag event class, listeners, and classes are designed to support data movement. You can also use the drag framework to perform other UI actions. Ni afikun si gbigbe data laarin awọn nkan, o tun le ṣee lo lati ṣẹda ibaraẹnisọrọ lilọ kiri ati awọn ẹya miiran. Sibẹsibẹ, fun to ti ni ilọsiwaju awọn ẹya ara ẹrọ, o yẹ ki o ronu imuse fifa ati ju silẹ ninu ohun elo rẹ ni akọkọ.
O gbọdọ forukọsilẹ bi olutẹtisi lati fa awọn iṣẹlẹ. Awọn iṣẹlẹ fa jẹ okunfa nigbakugba ti olumulo ba gbe tabi tu ohun elo naa silẹ. Iṣẹlẹ fifa naa ti firanṣẹ si awọn olutẹtisi ati awọn ọna ipe pada. Awọn ọna wọnyi gba data ati pinnu boya lati gba tabi kọ. O le paapaa lo awọn ọna wọnyi lati yi irisi ohun elo naa pada. Nigbati o ba ṣetan lati ṣẹda ohun elo kan pẹlu awọn ẹya fa ati ju silẹ, o yẹ ki o faramọ pẹlu awọn ipilẹ ti fa-ati-ju Android app siseto.
Awọn ero ni a lo lati gbe lati iṣẹ ṣiṣe kan si omiran ninu ohun elo Android kan. Intents enable you to switch from one activity to another by using a specific language. In contrast to normal PC applications, which have only a single screen, Android apps can have a multitude of screen pages, each dedicated to a specific activity. These screen pages are accessed by the user in the target activity. Intents help you build better mobile applications.
Intents can also be used to jump from application to application. Many Android users see jumping from one application to another. Fun apere, if a user receives a payment link, they may open a PayPal or GPay application. In such situations, the system can respond by passing an Intent to the user. Intents allow you to move from one app to another with ease. You can even use them to create a new application entirely!
Intents ṣiṣẹ otooto ni kọọkan irú. Ti o ba fẹ ṣafihan alaye nipa awọn idiyele ọja, o le lo iṣẹ-ṣiṣe asynchronous ti a npe ni “Akojọ View”. Ìfilọlẹ yii ṣe afihan data lati wiwo atokọ nigbati olumulo ba tẹ nkan tẹtisi. Kanna n lọ fun kikojọ alaye owo ni ohun elo kan. Jubẹlọ, o le lo awọn iṣẹ-ṣiṣe asynchronous fun awọn iṣe idiju, bi wíwọlé si Intanẹẹti tabi ṣayẹwo imeeli rẹ.
Ọkan ninu awọn ọna ti o dara julọ lati daabobo ohun elo Android ni lati lo sandboxing. Ilana yii ṣe aabo fun ẹrọ ṣiṣe lati awọn ohun elo irira nipa ṣiṣe app ni tirẹ “aaye.” Eyi ṣe aabo fun ẹrọ olumulo lati ipa ti awọn ohun elo miiran. Lilo sandboxing jẹ irọrun pupọ ati pe yoo jẹ ki ohun elo Android rẹ jẹ ailewu fun awọn olumulo rẹ. Lati kọ ẹkọ bi o ṣe le lo sandboxing fun siseto ohun elo Android, ka lori.
Fun apere, suppose you want to display the shares of your users. Lẹhinna, you could use a BufferedReader and an InputStream to read the data. Using an InputStream, you could use simulated financial data to show the contents of a log message. You could even use this same string to display a message to users. When you use the Internet, the Android system needs an asynchronous task. This is called a HoleDatenTask, and it runs in the background.
Android’s sandbox uses the user ID to establish security between apps and processes. Its security model enforces separation of processes and users. It also controls the access to files that are not associated with the application. This protects the device from malicious apps. Sandbox is simple, auditable, and is based on UNIX-style user separation of processes. It also enforces file permissions. In short, it keeps the Android system safe from malicious applications.
Ti o ba jẹ tuntun si siseto Android, you might be wondering where to start. Oriire, there are a few resources available to help you get started. Using an Android development tool like Android Studio is one of the easiest ways to get started. It’s also free, so there’s no reason to wait until you’re an expert to get started! This course will teach you the basics of Java and Android programming. It also covers how to create an app and create a game.
The first lesson of Android programming starts with an introduction to the Hole Data Button and the Listener-Object, which is responsible for identifying user input. It then covers anonymous classes and event treatment. Ni afikun, students will learn about the preparations for Quellcode, a Java-programmation tool for Android. These tools make it easy to create Listener-Objects and improve the visibility of your code.
If you’re a developer looking to develop an Android app, Java is an essential part of the process. Developing a native Android app with JavaScript requires an SDK, such as Android Studio. Ko dabi awọn ohun elo wẹẹbu, native Android apps can directly access all mobile hardware and software, pẹlu kamẹra ati gbohungbohun. Nitori eyi, if you’re a developer, you’ll have an advantage over developers who use iOS or Windows.
While it’s possible to create Android apps using other languages, Java is the official programming language for the platform. While there are other programming languages, many enterprise leaders are switching to Kotlin to write their applications. ohun ti awọn olumulo fẹ ati ki o ko fẹ, Ipolowo eto, Uber, and AirBnB are all making the switch to use Kotlin. You can even learn more about it by reading our comprehensive Kotlin-How-to guide.
The advantages of using Java to create Android apps are numerous. The language is easy to learn, easy to debug, and compile, and is object-oriented, allowing developers to write modular programs that reuse code. Ni afikun, Java is cross-platform, making it easy to move code between computer systems. Ni afikun, Java is highly compatible with Android’s development kit, making it an ideal choice for a variety of projects.
When creating Android apps, it is important to know what your target audience is and what they expect from the app. If your target audience is primarily young, you can use the C++ language. Sibẹsibẹ, you should keep in mind that C++ is not as user-friendly as Java, so you may want to consider another programming language. Sibẹsibẹ, you must choose a language that makes your target audience happy. If you don’t know Java, you can try Objective-C. This is a general-purpose object-oriented programming language originally created by Tom Love and Brad Cox for Smalltalk-80 systems.