我正在尝试在 android 中做一个简单的布局,其中包含另一个文件,该文件是由三个按钮组成的底部导航。
我无法将包含的文件排列在底部。这是我的布局 xml(TextView 显示与父底部对齐,但包含的文件没有):
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/patientDOBBlock"
tools:text="Test Navigation Text"
android:layout_alignParentBottom="true"/>
<include
android:id="@+id/navigation"
android:layout_below="@+id/patientDOBBlock"
layout="@layout/bottom_navigation"
android:layout_height="66dp"
android:layout_width="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_alignParentBottom="true"/>
</RelativeLayout>
包含的文件:
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/task_base_buttons"
android:layout_width="match_parent"
android:layout_height="66dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<Button
android:id="@+id/btnTaskBack"
style="@style/NeutrifProText.Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_weight="0.2"
android:background="@android:color/transparent"
android:text="@string/action_back"
android:textColor="@color/colorPrimary"
app:layout_constraintBottom_toBottomOf="@+id/btnTaskContinue"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/btnTaskContinue" />
<Button
android:id="@+id/btnTaskContinue"
style="@style/NeutrifProText.Button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_weight="0.6"
android:background="@drawable/rounded_rect_color_primary"
android:text="@string/action_continue"
android:textColor="@color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/btnTaskSkip"
app:layout_constraintStart_toEndOf="@+id/btnTaskBack" />
<Button
android:id="@+id/btnTaskSkip"
style="@style/NeutrifProText.Button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_weight="0.2"
android:background="@android:color/transparent"
android:text="@string/action_skip"
android:textColor="@color/colorPrimary"
app:layout_constraintBottom_toBottomOf="@+id/btnTaskContinue"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@+id/btnTaskContinue" />
</android.support.constraint.ConstraintLayout>
</merge>
知道为什么吗?顺便说一句,这个相同的包含文件显示在 fragment 的底部。
编辑:我包括了 fragment 的布局,其中布局确实出现在底部
<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/task_constraint_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.rangerhealth.rangerprovider.view.fragment.BaseTaskFragment"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="25dp">
<!-- TODO: Update blank fragment layout -->
<TextView
android:id="@+id/task_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="50dp"
android:gravity="center"
android:textColor="@color/black"
android:textSize="@dimen/title_font_size"
tools:text="Title"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/task_subtitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_below="@+id/task_title"
android:layout_centerHorizontal="true"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="17dp"
android:gravity="center"
tools:text="Subtitle"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/task_title" />
<TextView
android:id="@+id/task_description"
android:layout_width="match_parent"
android:layout_height="21dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:gravity="center_horizontal"
tools:text="Description"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/task_subtitle" />
<include layout="@layout/bottom_navigation"
android:layout_height="match_parent"
android:layout_width="match_parent"
/>
<RelativeLayout
android:id="@+id/task_placeholder"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/task_description"
app:layout_constraintBottom_toTopOf="@id/task_base_buttons"
>
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
最佳答案
在布局中,您将包含的布局与父底部对齐并位于 patentDOBBlock
下方。这两个指令是冲突的。我假设您希望底部导航和 TextView 都与父底部对齐并重叠。
在包含的布局中删除以下行:
android:layout_below="@+id/patientDOBBlock"
剩下以下布局:
<RelativeLayout
android:id="@+id/activity_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white">
<TextView
android:id="@+id/patientDOBBlock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
tools:text="Test Navigation Text" />
<include
android:id="@+id/navigation"
layout="@layout/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="66dp"
android:layout_alignParentBottom="true"
app:layout_constraintBottom_toBottomOf="parent" />
</RelativeLayout>
在bottom_navigation.xml 中,删除merge
标记。来自 documentation :
The tag helps eliminate redundant view groups in your view hierarchy when including one layout within another.
由于您需要将 ConstraintLayout
保留在包含的文件中,因此您没有多余的 View 组,因此不需要合并标记。使用合并标签还可以防止将布局参数应用于包含文件。请参阅this .
You can also override all the layout parameters (any android:layout_* attributes) of the included layout's root view by specifying them in the tag.
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/task_base_buttons"
android:layout_width="match_parent"
android:layout_height="66dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<Button
android:id="@+id/btnTaskBack"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_weight="0.2"
android:background="@android:color/transparent"
android:text="action_back"
android:textColor="@color/colorPrimary"
app:layout_constraintBottom_toBottomOf="@+id/btnTaskContinue"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/btnTaskContinue" />
<Button
android:id="@+id/btnTaskContinue"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_weight="0.6"
android:background="@color/colorPrimary"
android:text="action_continue"
android:textColor="@android:color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/btnTaskSkip"
app:layout_constraintStart_toEndOf="@+id/btnTaskBack" />
<Button
android:id="@+id/btnTaskSkip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_weight="0.2"
android:background="@android:color/transparent"
android:text="action_skip"
android:textColor="@color/colorPrimary"
app:layout_constraintBottom_toBottomOf="@+id/btnTaskContinue"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@+id/btnTaskContinue" />
</android.support.constraint.ConstraintLayout>
结果如下:
尽管这不会造成任何损害,但 ConstraintLayout
中指定的约束将不会产生任何效果,除非父级也是 ConstraintLayout
,因此可以删除它们。
关于android - 无法使包含的 View 与布局中的父底部对齐,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47518177/