答案 0 :(得分:0)
如果要在约束布局中将视图放置在屏幕的底部中心,则需要在视图中添加以下内容:
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
<?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="match_parent">
<android.support.design.widget.FloatingActionButton
android:id="@+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:clickable="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/floatingActionButton2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintHorizontal_chainStyle="packed"
app:srcCompat="@android:color/holo_orange_dark" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/floatingActionButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:clickable="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/floatingActionButton3"
app:layout_constraintStart_toEndOf="@+id/floatingActionButton"
app:layout_constraintHorizontal_chainStyle="packed"
app:srcCompat="@android:color/holo_orange_dark" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/floatingActionButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:clickable="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/floatingActionButton4"
app:layout_constraintStart_toEndOf="@+id/floatingActionButton2"
app:layout_constraintHorizontal_chainStyle="packed"
app:srcCompat="@android:color/holo_orange_dark" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/floatingActionButton4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:clickable="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/floatingActionButton5"
app:layout_constraintStart_toEndOf="@+id/floatingActionButton3"
app:layout_constraintHorizontal_chainStyle="packed"
app:srcCompat="@android:color/holo_orange_dark" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/floatingActionButton5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:clickable="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@+id/floatingActionButton4"
app:layout_constraintHorizontal_chainStyle="packed"
app:srcCompat="@android:color/holo_orange_dark" />
</android.support.constraint.ConstraintLayout>
底部的视图链接在一起,所有视图约束到屏幕底部,第一个视图向左约束到父对象的左端,最后一个向右约束到右端。的父母。
答案 1 :(得分:0)
对于constraintlaout中的底部居中,将此约束设置为浮动按钮 如果要添加多个浮动按钮,请在其中添加所有此FloatingActionButton LinearLayout orientation =“ horizontal”并将此约束添加到LinearLayout 在图片中,这不是FloatingActionButton,而是视图,因此您可以根据需要添加
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
答案 2 :(得分:0)
在约束布局内使用水平方向的线性布局。将线性布局约束到约束布局的底部,末端和起点。
这是一个简单的例子。
<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="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:id="@+id/floating_action_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:orientation="horizontal">
<android.support.design.widget.FloatingActionButton
android:id="@+id/a"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/b"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/x"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
答案 3 :(得分:0)
删除水平偏差属性。
我猜你有这样的app:layout_constraintHorizontal_bias="0.76"
只需将其删除或将其设置为0.5