Android: Login and Signup using SQLite in Android Studio(1)

❗❗이 게시물은 Youtube https://www.youtube.com/watch?v=zz659HPTe6M 을 보고 작성되었습니다❗❗

1. values/color.xml 설정

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
    <color name="gray">#808080</color>
    <color name="main">#99CCFF</color>
</resources>

2. Gardle Scripsts/build.gardle.kts(Module :app) 설정

Gardle Scripts = 안드로이드 프로젝트의 빌드 정보, 라이브러리 등을 관리
build.gardle.kts(Module :app)에 viewBinding 추가하기

android {
    ...
    buildFeatures {
        viewBinding = true
    }
}

위의 코드 작성 후 Sync Now 클릭. 영상에서는 viewBinding true라고 쓰고 넘어갔지만 그럴 경우 에러 발생

3. AndroidManiufest.xml 설정

<intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

이 부분 삭제

4. drawable/signup_background.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient android:type="linear" android:angle="100"
    android:startColor="#FFCC33" android:endColor="#CC3333"/>

</shape>

5. activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/signup_background"
    android:padding="16dp"
    tools:context=".LoginActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SIGN UP PAGE"
        android:layout_gravity="center"
        android:textSize="30dp"
        android:gravity="center"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/signupUsername"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        />


    <EditText
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:id="@+id/signupUsername"
        android:hint="Username"
        android:padding="12dp"
        android:background="@drawable/edittext_boarder"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/signupUserphonenumber"
        android:layout_marginTop="50dp"
        android:layout_marginBottom="8dp"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        />


    <EditText
        android:id="@+id/signupUserphonenumber"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@drawable/edittext_boarder"
        android:hint="Phone number"
        android:inputType="phone"
        android:padding="12dp"
        app:layout_constraintBottom_toTopOf="@+id/signupId"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/signupUsername"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        />

    <EditText
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:id="@+id/signupId"
        android:hint="Id"
        android:inputType="phone"
        android:padding="12dp"
        android:background="@drawable/edittext_boarder"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/signupUserphonenumber"
        app:layout_constraintBottom_toTopOf="@+id/signupPassword"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        />

    <EditText
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:id="@+id/signupPassword"
        android:hint="Password"
        android:inputType="textPassword"
        android:padding="12dp"
        android:background="@drawable/edittext_boarder"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/signupId"
        app:layout_constraintBottom_toTopOf="@+id/signupButton"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        />

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:id="@+id/signupButton"
        android:text="SIGNUP"
        android:backgroundTint="@color/gray"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        app:layout_constraintBottom_toTopOf="@+id/loginRedirect"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/signupPassword"/>

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:id="@+id/loginRedirect"
        android:text="Already registered? Login"
        android:textSize="18dp"
        android:gravity="center"
        android:textColor="@color/main"
        android:layout_marginTop="16dp"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@id/signupButton"/>

</androidx.constraintlayout.widget.ConstraintLayout>

6. constraintlayout

constraintlayou은 부모의 뷰그룹 안에 다른 요소들과의 상대적인 제약조건을 설정함으로써 화면에 배치되도록 하는 레이아웃. 기존의 레이아웃에 비해 레이아웃이 중첩되지 않도록 만들 수 있다.
참고 https://superohinsung.tistory.com/231

activity_login.xml파일 자세한 내용 설명➡️