ConstraintLayout （约束布局）属性详情

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app:layout_constraintLeft_toLeftOf

//Constrains the left side of a child to the left side of a target child (contains the target child id).

表示此控件的左边框与某个控件的左边框对齐或者在其右边

视图1

代码1

app:layout_constraintLeft_toRightOf

//Constrains the left side of a child to the right side of a target child (contains the target child id).

表示此控件的左边框与某个控件的右边框对齐或者在其右边

视图2

app:layout_constraintRight_toLeftOf

//Constrains the right side of a child to the left side of a target child (contains the target child id).

表示此控件的右边框与某个控件的左边框对齐或在其左边

视图3

app:layout_constraintRight_toRightOf

//Constrains the right side of a child to the right side of a target child (contains the target child id).

表示此控件的右边框与某个控件的右边框对齐或在其左边

视图4

app:layout_constraintTop_toTopOf

//Constrains the top side of a child to the top side of a target child (contains the target child id).

表示此控件的顶部边框与某个控件的顶部边框水平对齐或在其下边

视图5

app:layout_constraintTop_toBottomOf

//Constrains the top side of a child to the bottom side of a target child (contains the target child id).

表示此控件的顶部边框与某个控件的底部边框水平对齐或在其下边

视图6

app:layout_constraintBottom_toTopOf

//Constrains the bottom side of a child to the top side of a target child (contains the target child id).

表示此控件的底部边框与某个控件的顶部边框水平对齐或其上边

视图7

app:layout_constraintBottom_toBottomOf

//Constrains the bottom side of a child to the bottom side of a target child (contains the target child id).

表示此控件的底部边框与某个控件的底部边框水平对齐或其上边

视图8

app:layout_constraintBaseline_toBaselineOf

//Constrains the baseline of a child to the baseline of a target child (contains the target child id).

表示此控件与某个控件水平对齐

视图9

代码2

app:layout_editor_absoluteX

//The design time location of the left side of the child.

表示此控件在布局中X轴的绝对坐标点。如图代码3

代码3

app:layout_editor_absoluteY

//The design time location of the right side of the child.

表示此控件在布局中Y轴的绝对坐标点。如图代码3

app:layout_constraintGuide_begin

//The distance of child (guideline) to the top or left edge of its parent.

表示在布局中引导线距顶部或左边框的距离（如：20dp表示距顶部或者左边框20dp）

视图10

代码10

app:layout_constraintGuide_end

//The distance of child (guideline) to the top or left edge of its parent.

表示在布局中引导线距底部的距离（如：10dp表示距顶部10dp）

app:layout_constraintGuide_percent

//The ratio of the distance to the parent's sides

表示在整个布局中引导线距离左边框的百分百（如：app:layout_constraintGuide_percent="0.5"表示距离左边框50%的位置）

视图11

代码11

app:layout_constraintStart_toEndOf

//Constrains the start side of a child to the end side of a target child (contains the target child id).

表示此控件的左边界在某个控件右边界的右边，及表示此控件在某个控件的右边

视图12

app:layout_constraintStart_toStartOf

//Constrains the start side of a child to the start side of a target child (contains the target child id).

表示此控件的左边界与某个控件的左边界在同一垂直线上

视图13

app:layout_constraintEnd_toStartOf

//Constrains the end side of a child to the start side of a target child (contains the target child id).

表示此控件的右边界与某个控件的左边界在同一垂直线上

视图14

app:layout_constraintEnd_toEndOf

//Constrains the end side of a child to the end side of a target child (contains the target child id).

表示此控件的右边界与某个控件的右边界对齐

视图15

app:layout_constraintHorizontal_bias

//The ratio between two connections when the left and right (or start and end) sides are constrained.

表示此控件在布局中的水平方向上的偏移百分百。如视图16，代码16

视图16

app:layout_constraintVertical_bias

//The ratio between two connections when the top and bottom sides are constrained.

表示此控件在布局中的的垂直方向上的偏移百分百。如视图16，代码16

代码16

app:layout_constraintDimensionRatio

//The child's side to constrain using dimensRatio.

表示两个控件的纵横比，而使用则需要把宽（layout_width）或者高（layout_height）设置为0dp，根据另一个属性和比例, 计算当前属性, 如两个图片控件的显示大小，app:layout_constraintDimensionRatio="4:3"；

视图13

app:layout_goneMarginLeft

//The left margin to use when the target is gone.

app:layout_goneMarginTop

//The top margin to use when the target is gone.

app:layout_goneMarginRight

//The right margin to use when the target is gone

app:layout_goneMarginBottom

//The bottom margin to use when the target is gone.

app:layout_goneMarginStart

//The start margin to use when the target is gone.

app:layout_goneMarginEnd

//The end margin to use when the target is gone.