Introduction to Android application development

A memorandum of Android application development

Benefits of app development

--Learn Java and Kotlin ――You can make your own favorite app --Opening the way to professionals

release

Release from Google Play Console

** Notes, working method ** Note that if the package name is com.example, it cannot be released. If you want to change it, refactor and rename it from Android manifest.

Increase the version of build.gradle (app).

The size (resolution) of the icon can be changed by painting (for Windows).

The app name after installation is decided by Android Manifest.

AndroidManifest.xml


android:label="@string/app_name"

Source code control

In the case of Git Sourcetree for the time being

** How to clone ** The save destination path should be an empty folder and the name should be the same as the empty folder.

** Create local repository ** Open a terminal (button near the top right) and run git init in the directory you want to be the repository Press the + button and add with Add a repository

AndroidStudio If the device is no longer recognized after upgrading Andoid Studio, revoke the permission for USB debugging of the device.

Android Studio shortcut

ctrl + shift + enter Colon auto-completion

About the library

Pay attention to the version when using the library. If there is no version, a compile error or Gradle error may occur. Do I have to match the SDK version?

Example) implementation 'com.squareup.okhttp3:okhttp:3.10.0' implementation 'com.android.support:design:28.0.0' This is used as a set.

Source code (Android)

LayoutInflater (inflater) Load the resource (xml) and make it a view.

Tablayout pageTitle is final

Source code (Java)

public Make the specified class name and file name the same.

ArrayList Does it matter the size?

cast Substituting double for an int will truncate after the decimal point.

this.s Instance variable s

** Inheritance ** When a subclass is created, the parent class's constructor is executed before the child class's constructor is executed.

** Object class ** Implicit parent class of toString and getClass methods.

** Abstract class ** It is convenient to hold it as a variable (array OK), create an instance of the subclass, and assign it.

** Abstract method ** Because of the call abstraction?

interface By casting and assigning an instance in the interface, only the functions described in the interface can be used.

If the interface is static, it can be used as it is.

There is a way to implements and implement it in the class, and a way to implement it in a new (it looks like it is actually an anonymous class) and an anonymous class.

throws throws is used as a set with the method, and when an exception occurs, it returns to the method caller and catches.

Create your own exception handling class and catch it using throw (mark of exception occurrence).

equals equals returns boolean by comparing the same references.

protected It can be accessed from an instance of a subclass. (Not accessible from superclass instances)

** Anonymous class ** Since it is defined in the main routine, it is not processed in order from the top.

** Method ** By looking at the return value first, you can see what to do. Example) getView returns the view at the end.

Recommended Posts

Introduction to Android application development
[Introduction to Android application development] Let's make a counter
Introduction to Android Layout
Android application development preparation 7/15
Introduction to Keycloak development
Try to introduce OpenCV to Android application
Notes for Android application development beginners
Introduction to Ruby 2
Introduction to Slay the Spire Mod Development (1) Introduction
A newcomer tries to summarize the Android view (beginner Android application development)
Introduction to SWING
Introduction to web3j
Introduction to Micronaut 1 ~ Introduction ~
Android Development App_Preparation
[Java] Introduction to Java
Introduction to migration
Introduction to Docker / Kubernetes Practical Container Development
Introduction to java
Introduction to Doma
Introduction to Android App Development 1 Installing JDK and Android Studio for mac
[Android application development] How to display in full screen (notification bar hidden)
Trial and error to display national holidays in Android application development. Part 1
Introduction to Java development environment & Spring Boot application created with VS Code
Android application development using Unity + ARCore on Ubuntu
Introduction to Robot Battle with Robocode (Beginner Development)
Introduction to JAR files
Introduction to Ratpack (8)-Session
Android development link summary
Introduction to RSpec 1. Test, RSpec
Introduction to bit operation
Introduction to Ratpack (6) --Promise
Introduction to Ratpack (9) --Thymeleaf
Introduction to PlayFramework 2.7 ① Overview
Personal application development diary # 2
Introduction to design patterns (introduction)
Introduction to Practical Programming
Introduction to javadoc command
Personal application development diary # 3
Introduction to jar command
Introduction to Ratpack (2)-Architecture
Introduction to lambda expression
Introduction to java command
Introduction to RSpec 2. RSpec setup
Learn while making a WEB server Introduction to WEB application development from the basics
Introduction to javac command
Android development reference site
[Introduction] Try to create a Ruby on Rails application
Introduction to Slay the Spire Mod Development (2) Development Environment Construction
Experienced Java users get started with Android application development
[Note] Challenge to develop Android application for business use
App development beginners tried to make an Android calculator app
Introduction to Design Patterns (Builder)
How to create an application
iOS engineer starts Android development
Android app personal development kickoff
Introduction to RSpec 5. Controller specs
Introduction to RSpec 6. System specifications
ROS app development on Android
Introduction to RSpec 3. Model specs
Introduction to Ratpack (5) --Json & Registry
Introduction to Metabase ~ Environment Construction ~