Õppige Androidi rakenduste arendamise põhitõdesid

Õppige Androidi rakenduste arendamise põhitõdesid

You may be new to Android app development. To learn more about this language, read our articles on Java, Kotlin, Activity, and Fragmentation. This will give you an understanding of the fundamentals of Android programming. Samuti, you will be able to create an Android app by following the steps described in the tutorials. There are many more articles on Android available on the web. If you have any questions, don’t hesitate to ask in the comments section below.

Java

As you learn the Java for Android app development language, you will likely encounter a number of challenges. Kuid, there are several things you can do to maximize the learning experience. Esiteks, choose a project you can complete easily, such as a game. After that, you can continue learning about Android app development by building other types of applications. As you learn, Samuti ehitate oma arendajate võrgustiku ja vahetate teadmisi. Te ei õpi mitte ainult eakaaslastelt uusi oskusi, Kuid saate abi ka kõigi probleemide korral, millega oma rakenduse väljatöötamisel kokku puutute.

Java-rakenduse arendamise jaoks on Java veel üks suur eelis see, et seda saab kasutada platvormidevaheliste rakenduste väljatöötamiseks. Kuna Java on avatud lähtekoodiga programmeerimiskeel, Selle kasutamiseks ei pea te maksma, Mis on suurepärane uudis neile, kes peavad välja töötama mitmesuguste platvormide rakendusi. Avatud lähtekvaliteedina, Java pakub hulgaliselt raamatukogusid ja vaikekujundusmustreid, mida arendajad saavad kasutada kindlate mobiilirakenduste loomiseks. Java -rakendusi saab hõlpsasti muuta, et need sobiksid erinevate arendajate vajadustega.

Although Kotlin is a better choice for Android app development than Java, it does require a learning curve. Kotlin is an object-oriented programming language that is compatible with both Java and Android. Java is also a popular language for building game consoles, data centers, and cell phones. If you plan to develop an app for Android, it’s best to start with Java and learn Kotlin.

Kotlin

A good place to start learning Kotlin is Peter Sommerhoff’s book, Kotlin for Android App Development. Sommerhoff offers an extended set of code listings and leads readers through the development of two Android apps. The book is well illustrated with many screenshots and diagrams. While the book teaches you Kotlin, it is best to start by reading other Android books on the subject. Keel on lihtsam mõista ja õppida, kui teate, kuidas seda lugeda.

Paljud Androidi arendajad on Javaga juba tuttavad, Nii et nende olemasoleva koodibaasi teisendamine Kotliniks on suhteliselt sirgjooneline protsess. Kuigi kahe keele vahel on teatud erinevused, Täielikuks kursis olemiseks peaks kuluma vaid mõni nädal. Nagu iga uue keele puhul, Võtke kindlasti aega. Kuigi Java on endiselt kõige populaarsem, see on tõenäoliselt pikka aega, kuni see asendab Kotlini.

Kotlin on Java-põhine programmeerimiskeel, Ja selles on lihtne Java -koodi ilma raskusteta helistada. Tegelikult, Java ja Kotlin genereerivad mõlemad sarnast baitkoodi. Androidi rakenduse loomiseks saate kasutada Kotlinit, kirjutades Kotlinis rakenduse lihtsaid osi ja seejärel teisendades ülejäänud koodibaasi Javaks. Kotlini kasutamise eeliseid Androidi rakenduste arendamiseks on palju.

Killustatus

Fragmenti kasutades saate oma Androidi rakenduse arengus killustatuse kontseptsiooni kasutada’ muster. Fragmendid elavad hostitegevuse vaategrupis ja pakuvad väljanägemist XML või Java kaudu. Fragmendid rakendavad oncreateview() meetod, mis suurendab fragmendi kasutajaliidest ja tagastab selle juurepaigutuse, kui seda pole. Fragmentidel on kaks paigutuse ressursifaili. Üks kuvab teksti ja teine ​​kuvab taustvärvi.

Oma fragmentide arendamise ajal, Oluline on nimetada on -loodet() meetod fragmendi loomisel. Meetod peab lähtestama vajalikud komponendid ja säilitama need isegi siis, kui fragment on peatatud või peatatud. Lisaks, peaksite helistama OnCreateview'le() callback when drawing the UI for the first time. If you want to override this method, you must call through to the implementation of the superclass.

Another benefit of fragmentation is that it allows you to change the look and feel of different parts of the activity at runtime. With the help of fragments, you can add or remove components and revert changes. Fragments can be used in multiple activities, and can also be children of other fragments. Just make sure that your fragments don’t depend on other fragments. These fragments can share the same parent activity.

Activity

To get started with an Activity, you need to know what the onCreate method does. This method is called when the activity is first created. Sellel meetodil, you can initialize data objects and UI elements. You can override the savedInstanceState variable to determine the activity’s layout. OnCreate(Bundle) calls onCreate() when the Activity first starts. Siis, whenever the Activity is exited, it calls onDestroy().

The onPause() callback is used to release heavy resources. It also stops video or animation playback. The onStop() method is called when the activity is no longer in focus. Like the onStart() meetod, this one also does a little more work. It saves all state information in the memory, and is also called when the activity loses focus. In most cases, you’ll only call the onStart() method once in the activity’s life cycle.

An activity is an app that is developed on an Android device. This app uses the device’s internal sensors to perform various tasks, including taking screenshots, storing data, and performing actions. Students will develop the app by using free software, such as MIT App Inventor. Students can also download this software from the Internet. This software also allows students to practice their programming design and skills. Lõppkokkuvõttes, students will be able to publish their own Android apps and earn a diploma in computer science.

Tegevuse komponent

An activity is a type of user interface in an Android app. It consists of a hierarchy of views, each controlling a rectangular space inside the activity window. Each view has a unique name and a different function – näiteks, a button can trigger an action when the user taps it. A list of attributes can be defined in the Activity class. Changing the Activity class’s name can break functionality.

The Activity class consists of subclasses. Each activity implements a method that responds to changes in the application’s state. Activities are managed in a container environment. They are similar to Java applets and servlets. You can use the Activity life cycle to test whether the application will restore its state when the user rotates the device. To use the Activity component in Android app development, you must learn the basics of Android programming.

The onSaveInstanceState() method can be overridden to save the current state of the UI. Kuid, it’s important to note that onSaveInstanceState() is not guaranteed to be called before an activity’s destruction. If the state of the activity changes, it’s best to override onRestoreInstanceState() instead. Nii, you can keep track of changes made by the user during a particular time.

Navigeerimiskomponent

Navigeerimiskomponent vastutab rakenduse kasutajaliidese värskendamise eest väljaspool Navhostfragmenti. Kuigi suurem osa navigeerimise visuaalstest värskendustest toimub NavhostFragment, Navigeerimiskomponenti saab kasutada ka muude kasutajaliidese elementide kuvamiseks, nagu navigeerimissahtli või TAB -riba, mis kuvab kasutaja praeguse asukoha. Järgnevad on mõned levinumad viisid oma rakenduses navigeerimise komponendi kasutamiseks.

Esiteks, navigeerimisfaili navigeerige. See on navgraph, ressursifail, mis sisaldab navigatsiooniga seotud teavet. See kuvab teie rakenduse individuaalsed sisuvaldkonnad ja kirjeldab võimalikke teid rakenduse kaudu. Navigeerimise redigeerija kasutamine, saate navgraphi visualiseerida, navigeerimissisu puu-sarnane struktuur. NAVIGRAPHID on jagatud sihtkohtadeks ja toiminguteks, which define different paths a user can take within the app.

The Navigation component makes it much easier to implement navigation in an Android app. It follows a set of principles and makes navigation consistent across all apps. Oma lihtsuse tõttu, Navigation requires only one Activity, which allows for easy animations between Fragments and improves the app’s performance. It solves many problems with navigation in Android apps and is a valuable addition to the Android ecosystem. You can use this framework to quickly develop an app without coding in the UI.