app:layout_constraintLeft_toLeftOf
//Constrains the left side of a child to the left side of a target child (contains the target child id).
表示此控件的左邊框與某個(gè)控件的左邊框?qū)R或者在其右邊
app:layout_constraintLeft_toRightOf
//Constrains the left side of a child to the right side of a target child (contains the target child id).
表示此控件的左邊框與某個(gè)控件的右邊框?qū)R或者在其右邊
app:layout_constraintRight_toLeftOf
//Constrains the right side of a child to the left side of a target child (contains the target child id).
表示此控件的右邊框與某個(gè)控件的左邊框?qū)R或在其左邊
app:layout_constraintRight_toRightOf
//Constrains the right side of a child to the right side of a target child (contains the target child id).
表示此控件的右邊框與某個(gè)控件的右邊框?qū)R或在其左邊
app:layout_constraintTop_toTopOf
//Constrains the top side of a child to the top side of a target child (contains the target child id).
表示此控件的頂部邊框與某個(gè)控件的頂部邊框水平對(duì)齊或在其下邊
app:layout_constraintTop_toBottomOf
//Constrains the top side of a child to the bottom side of a target child (contains the target child id).
表示此控件的頂部邊框與某個(gè)控件的底部邊框水平對(duì)齊或在其下邊
app:layout_constraintBottom_toTopOf
//Constrains the bottom side of a child to the top side of a target child (contains the target child id).
表示此控件的底部邊框與某個(gè)控件的頂部邊框水平對(duì)齊或其上邊
app:layout_constraintBottom_toBottomOf
//Constrains the bottom side of a child to the bottom side of a target child (contains the target child id).
表示此控件的底部邊框與某個(gè)控件的底部邊框水平對(duì)齊或其上邊
app:layout_constraintBaseline_toBaselineOf
//Constrains the baseline of a child to the baseline of a target child (contains the target child id).
表示此控件與某個(gè)控件水平對(duì)齊
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軸的絕對(duì)坐標(biāo)點(diǎn)。如圖代碼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軸的絕對(duì)坐標(biāo)點(diǎn)。如圖代碼3
app:layout_constraintGuide_begin
//The distance of child (guideline) to the top or left edge of its parent.
表示在布局中引導(dǎo)線距頂部或左邊框的距離（如：20dp表示距頂部或者左邊框20dp）
app:layout_constraintGuide_end
//The distance of child (guideline) to the top or left edge of its parent.
表示在布局中引導(dǎo)線距底部的距離（如：10dp表示距頂部10dp）
app:layout_constraintGuide_percent
//The ratio of the distance to the parent's sides
表示在整個(gè)布局中引導(dǎo)線距離左邊框的百分百（如：app:layout_constraintGuide_percent="0.5"表示距離左邊框50%的位置）
app:layout_constraintStart_toEndOf
//Constrains the start side of a child to the end side of a target child (contains the target child id).
表示此控件的左邊界在某個(gè)控件右邊界的右邊识藤，及表示此控件在某個(gè)控件的右邊
app:layout_constraintStart_toStartOf
//Constrains the start side of a child to the start side of a target child (contains the target child id).
表示此控件的左邊界與某個(gè)控件的左邊界在同一垂直線上
app:layout_constraintEnd_toStartOf
//Constrains the end side of a child to the start side of a target child (contains the target child id).
表示此控件的右邊界與某個(gè)控件的左邊界在同一垂直線上
app:layout_constraintEnd_toEndOf
//Constrains the end side of a child to the end side of a target child (contains the target child id).
表示此控件的右邊界與某個(gè)控件的右邊界對(duì)齊
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许蓖。如視圖16令杈，代碼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叔汁。如視圖16孙援，代碼16
app:layout_constraintDimensionRatio
//The child's side to constrain using dimensRatio.
表示兩個(gè)控件的縱橫比叹坦，而使用則需要把寬（layout_width）或者高（layout_height）設(shè)置為0dp熊镣，根據(jù)另一個(gè)屬性和比例, 計(jì)算當(dāng)前屬性, 如兩個(gè)圖片控件的顯示大小，app:layout_constraintDimensionRatio="4:3"；
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.
