一：水平方向

水平方向需要设置步骤如下

 设置view的layoutwidth=0dp,id分别为view1,view2分别view1 view2的 app:layout_constraintHorizontal_weight="1" 分别设置view1与view2的左右依赖 

view1 需要设置

layout_constraintLeft_toRightOf="@+id/view2"

view2需要设置依赖 

layout_constraintRight_toLeftOf=“@+id/view1”

具体代码如下

<androidx.constraintlayout.widget.ConstraintLayout android:id="@+id/constrain_bottom" android:layout_width="match_parent" android:layout_height="0dp" android:background="@drawable/bg_top_cornel" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintTop_toBottomOf="@+id/map_view" app:layout_constraintVertical_weight="2"> <View android:id="@+id/view1" android:layout_width="0dp" android:layout_height="wrap_content" android:background="#ff0000" app:layout_constraintHorizontal_weight="2" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toLeftOf="@id/view2" app:layout_constraintTop_toTopOf="parent" /> <View android:id="@+id/view2" android:layout_width="0dp" android:layout_height="wrap_content" android:background="#00ff00" app:layout_constraintHorizontal_weight="3" app:layout_constraintLeft_toRightOf="@id/view1" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout>

二：垂直方向

与上面类似，不需要需要设置的属性如下:

layout_constraintVertical_weight="xxx",另外需要设置垂直方向的约束，尤其是

layout_constraintTop_toBottomOf=view1的ID和 layout_constraintBottom_toTopOf=view2的ID

 

<?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=".activity.maintain.MapMaintainLocationActivity"> <com.amap.api.maps.TextureMapView android:id="@+id/map_view" android:layout_width="match_parent" android:layout_height="0dp" app:layout_constraintBottom_toTopOf="@+id/constrain_bottom" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintVertical_weight="3" /> <androidx.constraintlayout.widget.ConstraintLayout android:id="@+id/constrain_bottom" android:layout_width="match_parent" android:layout_height="0dp" android:background="@drawable/bg_top_cornel" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintTop_toBottomOf="@+id/map_view" app:layout_constraintVertical_weight="2"> <Button style="@style/button_round" android:layout_marginBottom="20dp" android:text="确定" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" /> </androidx.constraintlayout.widget.ConstraintLayout> </androidx.constraintlayout.widget.ConstraintLayout>

 

总结：在进行weight属性设置时，一定不要忘记设置想要瓜分weight的几个view之间的水平或垂直约束，否则设置的weight一点效果都没有，而且你一般情况还找不到啥错误，盲人摸象……