【 Android 中文開放式課程 】ConstraintLayout 約束佈局 for Android Studio 3

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dependencies {
…
 implementation ‘com.android.support.constraint:constraint-layout:1.0.2'
…
}

<Button
        android:id="@+id/btn_A"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="A"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_B"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="B"
        app:layout_constraintLeft_toRightOf="@+id/btn_A"
        app:layout_constraintTop_toTopOf="@+id/btn_A" />

    <Button
        android:id="@+id/btn_c"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="C"
        app:layout_constraintStart_toStartOf="@+id/btn_A"
        app:layout_constraintTop_toBottomOf="@+id/btn_A" />

<Button
    android:id="@+id/btn_A"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@+id/btn_B" />

<Button
    android:id="@+id/btn_B"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Button"
    app:layout_constraintLeft_toRightOf="@+id/btn_A"
    app:layout_constraintRight_toRightOf="parent" />

<Button
    android:id="@+id/btn_A"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="A"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@+id/btn_B" />

<Button
    android:id="@+id/btn_B"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="B"
    app:layout_constraintLeft_toRightOf="@+id/btn_A"
    app:layout_constraintRight_toLeftOf="@+id/btn_c" />

<Button
    android:id="@+id/btn_c"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="C"
    app:layout_constraintLeft_toRightOf="@+id/btn_B"
    app:layout_constraintRight_toRightOf="parent" />

<Button
    android:id="@+id/btn_A"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="A"
    app:layout_constraintHorizontal_chainStyle="spread_inside"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@+id/btn_B" />

<Button
    android:id="@+id/btn_B"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="B"
    app:layout_constraintLeft_toRightOf="@+id/btn_A"
    app:layout_constraintRight_toLeftOf="@+id/btn_c" />

<Button
    android:id="@+id/btn_c"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="C"
    app:layout_constraintLeft_toRightOf="@+id/btn_B"
    app:layout_constraintRight_toRightOf="parent" />

<Button
    android:id="@+id/btn_A"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="A"
    app:layout_constraintHorizontal_chainStyle="spread_inside"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toLeftOf="@+id/btn_B" />

<Button
    android:id="@+id/btn_B"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="B"
    app:layout_constraintLeft_toRightOf="@+id/btn_A"
    app:layout_constraintRight_toLeftOf="@+id/btn_c" />

<Button
    android:id="@+id/btn_c"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="C"
    app:layout_constraintLeft_toRightOf="@+id/btn_B"
    app:layout_constraintRight_toRightOf="parent" />

<Button
    android:layout_width="wrap_content"
    android:layout_height=“wrap_content"
    android:text="HKT"
    app:layout_constraintHorizontal_bias="0.2"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="HKT"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.1" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="HKT"
    app:layout_constraintTop_toTopOf="@+id/guideline_horizontal"
    app:layout_constraintLeft_toLeftOf="@+id/guideline_vertical"/>

<android.support.constraint.Guideline
    android:id=“@+id/guideline_vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    app:layout_constraintGuide_percent="0.7"/>

<android.support.constraint.Guideline
    android:id="@+id/guideline_horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    app:layout_constraintGuide_percent="0.8" />

dependencies {
    implementation ‘com.android.support.constraint:constraint-layout:1.1.0-beta3’
}

<Button
    android:id="@+id/btn_A"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="A"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/btn_B"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="B"
    app:layout_constraintCircle="@id/btn_A"
    app:layout_constraintCircleAngle="50"
    app:layout_constraintCircleRadius="100dp" />

---

參考資料：

• Constraint Layout v1 筆記
• Build a Responsive UI with ConstraintLayout
• ConstraintLayout