[안드로이드/Layout] Constraint Layout 제약 레이아웃 - chain 걸기

Constraint Layout

view 또는 부모에게 제약을 걸어 화면을 구성할 수 있는 레이아웃이다.

 

ConstraintLayout  |  Android Developers

 

 

---

 

부모에게 제약 걸기

 

<?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"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="150dp"
        android:layout_height="100dp"
        android:background="@color/black"
        android:gravity="center"
        android:text="Hello World!"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

 

 

특정 뷰에게 제약 걸기

식별자 id 로 제약을 건다.

 

<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!--특정 뷰에 제약걸기-->
    <TextView
        android:id="@+id/tv1"
        android:layout_width="100dp"
        android:layout_height="70dp"
        android:background="@color/black"
        android:gravity="center"
        android:text="TextView1"
        android:textColor="@color/white"
        app:layout_constraintEnd_toStartOf="@id/btn1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@id/btn1" />

    <TextView
        android:id="@+id/tv2"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="@color/black"
        android:gravity="center"
        android:text="TextView2"
        android:textColor="@color/white"
        app:layout_constraintBottom_toBottomOf="@id/btn1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/btn1"
        app:layout_constraintTop_toTopOf="@id/btn1" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="100dp"
        android:layout_height="70dp"
        android:background="@color/black"
        android:gravity="center"
        android:text="TextView3"
        android:textColor="@color/white"
        app:layout_constraintBottom_toTopOf="@id/tv1"
        app:layout_constraintEnd_toEndOf="@id/tv2"
        app:layout_constraintStart_toStartOf="@id/tv1"
        app:layout_constraintTop_toTopOf="parent" />
        
</androidx.constraintlayout.widget.ConstraintLayout>

 

 

view 끼리 chain 걸기

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/chain1"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginBottom="50dp"
        android:background="@color/purple_200"
        android:gravity="center"
        android:text="1"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@id/chain2"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintHorizontal_chainStyle="spread"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/chain2"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:background="@color/purple_200"
        android:gravity="center"
        android:text="2"
        android:textSize="20sp"
        app:layout_constraintEnd_toStartOf="@id/chain3"
        app:layout_constraintStart_toEndOf="@id/chain1"
        app:layout_constraintTop_toTopOf="@id/chain1" />

    <TextView
        android:id="@+id/chain3"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginBottom="50dp"
        android:background="@color/purple_200"
        android:gravity="center"
        android:text="3"
        android:textSize="20sp"
        app:layout_constraintEnd_toStartOf="@id/chain4"
        app:layout_constraintStart_toEndOf="@id/chain2"
        app:layout_constraintTop_toTopOf="@id/chain1" />

    <TextView
        android:id="@+id/chain4"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginBottom="50dp"
        android:background="@color/purple_200"
        android:gravity="center"
        android:text="4"
        android:textSize="20sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/chain3"
        app:layout_constraintTop_toTopOf="@id/chain1" />

</androidx.constraintlayout.widget.ConstraintLayout>

 

 

chainStyle="spread"

 

app:layout_constraintHorizontal_chainStyle="spread"

 

 

 

chainStyle="packed"

bias="0.5"

 

app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintHorizontal_chainStyle="packed"

 

 

 

chainStyle="packed"

bias="0.3"

 

app:layout_constraintHorizontal_bias="0.3"
app:layout_constraintHorizontal_chainStyle="packed"