单一控件
居中
上下左右全部居中，通过基础篇介绍的位置属性实现
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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居上
对Bottom不做约束即可实现居上的效果
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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居下
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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居左
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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居右
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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左上
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
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右下
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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水平任意位置
app:layout_constraintHorizontal_bias可以指定水平方向任意位置
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.3" />
</android.support.constraint.ConstraintLayout>
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垂直任意位置
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.7" />
</android.support.constraint.ConstraintLayout>
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任意位置
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.8"
app:layout_constraintVertical_bias="0.4" />
</android.support.constraint.ConstraintLayout>
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双控件
相对于单个子View来说，多个子View的布局才能凸显ConstraintLayout的优势
垂直等分
通过位置属性增加约束后，默认就是等分剩余空间
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="@id/button2" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/button1"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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水平等分
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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偏移（Space）
在等分基础上实现一定的偏移。一个做法是通过插入Space，配合app:layout_constraintHorizontal_weight实现
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<Space
android:id="@+id/space1"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="1" />
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toEndOf="@id/space1"
app:layout_constraintEnd_toStartOf="@id/space2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintHorizontal_weight="2"/>
<Space
android:id="@+id/space2"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="1" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/space2"
app:layout_constraintEnd_toStartOf="@id/space3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="2" />
<Space
android:id="@+id/space3"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="2" />
</android.support.constraint.ConstraintLayout>
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偏移（bias）
第二种实现偏移的方式是使用bias
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.4" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.9" />
</android.support.constraint.ConstraintLayout>
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紧贴一端
先使用spread两端对齐父容器，然后通过bias对一个View进行偏移
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintHorizontal_bias="0.3" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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内部紧贴
使用app:layout_constraintHorizontal_chainStyle="packed"
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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偏移
内部紧贴的基础上，可以使用bias进行偏移
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintHorizontal_bias="0.3" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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垂直方向偏移
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintVertical_bias="0.4"/>
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.7"/>
</android.support.constraint.ConstraintLayout>
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内部间隔
内部贴近的基础上，通过layout_margin增加间隔
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintHorizontal_bias="0.3" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginStart="15dp"/>
</android.support.constraint.ConstraintLayout>
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平分空间
两个子View平分父容器控件。
同时指定android:layout_width="0dp" 以及 app:layout_constraintHorizontal_chainStyle="spread"
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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调整比例
使用app:layout_constraintHorizontal_weight改变比例
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintHorizontal_weight="3" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="2" />
</android.support.constraint.ConstraintLayout>
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紧贴两端
使用app:layout_constraintHorizontal_chainStyle="spread_inside"是两个子View紧贴两端
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread_inside" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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调整比例
增加space，width指定0并指定app:layout_constraintHorizontal_weight
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/space1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintHorizontal_weight="3"/>
<Space
android:id="@+id/space1"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="2" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/space1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="1" />
</android.support.constraint.ConstraintLayout>
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两端对齐
控件的两端对齐，减少一端的约束可以实现单端对齐
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="140dp"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="70dp"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="@id/button1" />
</android.support.constraint.ConstraintLayout>
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中心对齐边缘
一个控件的中心对齐另一个控件边缘
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="140dp"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="70dp"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@id/button1"
app:layout_constraintBottom_toBottomOf="@id/button1" />
</android.support.constraint.ConstraintLayout>
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文字对齐
使用TextView的时候，通过app:layout_constraintBaseline_toBaselineOf对内部文字进行各种对齐
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="140dp"
android:text="1"
android:gravity="bottom|center"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="70dp"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBaseline_toBaselineOf="@id/button1"/>
</android.support.constraint.ConstraintLayout>
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三控件
水平等分
与双控件的水平等分一样
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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偏移
与双控件相同，略。
内部贴近
与双控件一样app:layout_constraintHorizontal_chainStyle="packed"
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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偏移
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintHorizontal_bias="0.3" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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内部间隔（1）
1、2贴近，3通过layout_margin进行间隔
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
android:layout_marginEnd="15dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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内部间隔（2）
通过layout_margin三个控件互相间隔
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:layout_constraintHorizontal_bias="0.3" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginStart="10dp"/>
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginStart="15dp"/>
</android.support.constraint.ConstraintLayout>
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平分空间
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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调整比例
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintHorizontal_weight="1" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="2" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="4" />
</android.support.constraint.ConstraintLayout>
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紧贴两端
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread_inside" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
</android.support.constraint.ConstraintLayout>
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调整比例
与双控件一样， 使用Space调整
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/space1"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_chainStyle="spread"
app:layout_constraintHorizontal_weight="4" />
<Space
android:id="@+id/space1"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="@id/button1"
app:layout_constraintEnd_toStartOf="@id/button2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="1" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toEndOf="@id/space1"
app:layout_constraintEnd_toStartOf="@id/space2"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="4" />
<Space
android:id="@+id/space2"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintStart_toEndOf="@id/button2"
app:layout_constraintEnd_toStartOf="@id/button3"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="3" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toEndOf="@id/space2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_weight="4" />
</android.support.constraint.ConstraintLayout>
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更多控件
条目
多个控件左对齐并且通过padding增加垂直间隔
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="20dp"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.button.MaterialButton
android:id="@+id/button1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.design.button.MaterialButton
android:id="@+id/button2"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:text="2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/button1" />
<android.support.design.button.MaterialButton
android:id="@+id/button3"
android:layout_width="170dp"
android:layout_height="wrap_content"
android:text="3"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/button2" />
<android.support.design.button.MaterialButton
android:id="@+id/button4"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:text="4"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/button3" />
</android.support.constraint.ConstraintLayout>
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复杂列表
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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="72dp"
android:paddingEnd="16dp"
android:paddingRight="16dp">
<ImageView
android:id="@+id/icon"
android:layout_width="72dp"
android:layout_height="72dp"
app:layout_constraintLeft_toLeftOf="parent" />
<TextView
android:id="@+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toTopOf="@+id/text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@id/icon"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_chainStyle="packed"
tools:text="Title" />
<TextView
android:id="@+id/text"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@id/icon"
app:layout_constraintTop_toBottomOf="@id/title"
tools:text="text" />
</android.support.constraint.ConstraintLayout>
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版权声明：本文为CSDN博主「fundroid_方卓」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/vitaviva/article/details/106736575
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