늦게 피는 꽃

1. AS / project / app / layout / activity_main.xml

2. new xml

3. 레이아웃

• LinearLayout
• RelativeLayout
• FrameLayout
• ScrollView

<화면전환 예제> - 출처:안드로이드 앱프로그래밍 9.0 p235

new project "myapplication1002"

res / new / layout - new "sub1.xml"

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="부분 화면 1"
        android:textSize="30sp" />

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="동의합니다"
        android:textSize="30sp" />
</LinearLayout>

new activity_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="버튼을 눌러 부분 화면을 추가하세요"
        android:textSize="20sp" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="추가하기" />
    <LinearLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

    </LinearLayout>

</LinearLayout>

edit app/ AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication1002">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MenuActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

new menuActivity.java

package com.example.myapplication1002;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {
    LinearLayout container;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);

        container = findViewById(R.id.container);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view) {
                LayoutInflater inflater = (LayoutInflater)
                        getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                inflater.inflate(R.layout.sub1,container,true);
                CheckBox checkBox = container.findViewById(R.id.checkBox);
                checkBox.setText("로딩되었어");
            }
        });
    }
}

왜 FIREBASE 인가? 빠른 개발에 유리.

firebase.google.com/docs/android/setup

1. AS project 생성 

2. FB project 생성시 앱 패키지이름 입력(=안드로이드프로젝트명) > google~.json 다운로드 후

3. AS 프로젝트 root 폴더로 복사 > build.gradle 확인(app수준 plugin imple / project수준 buildscript reposit)

    (다른방법 AS에서 tools/firebase assistant에서 auth - connect)

4. FB 콘솔에서 authenticaiton 로그인 사용설정

firebase.google.com/docs/auth/android/start/

ANDROID STUDIO 

• project
• package
• Gradle project / module:app 

FIREBASE (FB)

• project

github.com/firebase/quickstart-android

+ new empty Activity + new project

1. 시작 + start Project (App name) => res/values/strings.xml 

2. 구성 색상 변경하기 => res/values/colors.xml

3. 앱 화면구성하기 => res/layout/activity_main.xml

4. 프로젝트 구성

• app / AndroidManifests (앱정보)
• app / java (코딩)
• app / res (리소스폴더  레이아웃,values,drawable 등)
• Gradle scripts (배포)

5. App/Java/MainActivity.java

• package
• import
• public class MainActivity extends AppCompatActivity
• onCreate()
• setContentView()

1. 설치 프로그램 다운로드 

• 안드로이드 스튜디오 https://developer.android.com 

• setup wizard 에서 SDK포함하여 finish하여 설치

2. 프로그램 실행

• start N project > empty activity > (App Name 이름입력, 언어 JAVA)

3. 가상단말기 실행

• Tools > AVD manager (Android virtual device)> create

4. 자바 환경변수 설정 

• 내PC > 속성(고급) > new 사용자변수 ( jdk폴더까지의 new사용자변수 추가 후, PATH 클릭하여 추가  %new사용자변수명%bin)
• cmd > javac 확인, 어디에서나 자바실행 가능하도록 설정