我的XML代码如下:
<?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:id="@+id/constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".BottomNavActivity">
<TextView
android:id="@+id/message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:background="#CCB0F0"
android:text="Map"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="@id/idCardView" app:layout_constraintEnd_toEndOf="parent"/>
<android.support.v7.widget.CardView
android:id="@+id/idCardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_marginTop="5dp"
app:cardCornerRadius="4dp" app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="5dp" android:layout_marginBottom="332dp"
app:layout_constraintTop_toBottomOf="@+id/message"
app:layout_constraintBottom_toTopOf="@+id/container">
<fragment android:id="@+id/autocomplete_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:name="com.google.android.libraries.places.widget.AutocompleteSupportFragment"
/>
</android.support.v7.widget.CardView>
<android.support.constraint.ConstraintLayout
android:layout_width="0dp"
android:layout_height="0dp"
android:id="@+id/container"
app:layout_constraintTop_toBottomOf="@+id/idCardView"
app:layout_constraintBottom_toTopOf="@+id/navigation" app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintHorizontal_bias="0.0" app:layout_constraintVertical_bias="1.0">
</android.support.constraint.ConstraintLayout>
<android.support.design.widget.BottomNavigationView
android:id="@+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="@menu/navigation_menu"/>
</android.support.constraint.ConstraintLayout>
我想在顶部TextView
,然后是CardView
,然后是ConstraintLayout
,然后是bottomNavigationView
。元素以某种方式彼此堆叠,如下所示:
我确保每个元素都分别限制在下一个元素的顶部或底部。他们仍然最终在彼此之上。有没有更好的方法或解决此问题的方法?
答案 0 :(得分:2)
在卡片视图中,您在顶部添加了两个约束:删除app:layout_constraintTop_toTopOf="parent"
即可使用。
答案 1 :(得分:2)
您不需要将CardView约束到Container,只需将容器约束到CardView
<TextView
android:id="@+id/message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:background="#CCB0F0"
android:text="Map"
android:textSize="20sp"
android:textStyle="bold"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
/>
<android.support.v7.widget.CardView
android:id="@+id/idCardView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_marginTop="5dp"
app:cardCornerRadius="4dp"
tools:layout_editor_absoluteX="5dp"
android:layout_marginBottom="332dp"
app:layout_constraintTop_toBottomOf="@+id/message"
app:layout_constraintLeft_toLeftOf="parent"
>
<fragment android:id="@+id/autocomplete_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:name="com.google.android.libraries.places.widget.AutocompleteSupportFragment"
/>