此视图不受垂直约束.在运行时它会跳到左边，除非你添加一个垂直约束 [英] This view is not constrained vertically. At runtime it will jump to the left unless you add a vertical constraint
问题描述
Android Studio 2.2 中的新布局编辑器不断在 EditText 和 Buttons 等视图上显示此错误.敬请帮助.此外，任何有助于使用新约束布局的链接将不胜感激.
New Layout editor in Android Studio 2.2 keeps showing this error on views like EditText and Buttons. kindly help.Also, any links that help in onboarding with the new constraint layout would be appreciated.
代码:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
android:id="@+id/activity_main"
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="com.set.email.MainActivity"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="81dp">
<TextView
android:text="To:"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:layout_editor_absoluteX="7dp"
tools:layout_editor_absoluteY="4dp"
android:id="@+id/textTo"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="24dp"
android:id="@+id/editTo"
android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>
<EditText
android:layout_width="384dp"
android:layout_height="42dp"
android:inputType="textPersonName"
android:ems="10"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="94dp"
android:id="@+id/editSubject"
android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>
<EditText
android:layout_width="384dp"
android:layout_height="273dp"
android:inputType="textPersonName"
android:ems="10"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="179dp"
android:id="@+id/editMessage"
app:layout_constraintLeft_toLeftOf="@+id/activity_main"
tools:layout_constraintLeft_creator="50"
android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>
<Button
android:text="Send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
tools:layout_editor_absoluteX="140dp"
tools:layout_editor_absoluteY="454dp"
android:id="@+id/btnSend"
app:layout_constraintLeft_toLeftOf="@+id/editMessage"
tools:layout_constraintLeft_creator="0"
app:layout_constraintRight_toRightOf="@+id/activity_main"
android:layout_marginEnd="16dp"
tools:layout_constraintRight_creator="0"
android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"/>
</android.support.constraint.ConstraintLayout>
推荐答案
约束布局旨在减少布局层次结构并提高布局的性能(从技术上讲，您不必针对不同的屏幕尺寸进行更改，无重叠，工作方式类似于移动设备上的魅力以及具有相同约束的选项卡).这是您在使用新布局编辑器时摆脱上述错误的方法.
Constraint layout aims at reducing layout hierarchies and improves performance of layouts(technically, you don't have to make changes for different screen sizes,No overlapping, works like charm on a mobile as well as a tab with the same constraints).Here's how you get rid of the above error when you're using the new layout editor.
点击小圆圈并将其向左拖动直到圆圈变为绿色，以添加左侧约束(给出一个数字，例如 x dp.对其他边重复此操作，如果您有其他约束，则将底部约束留空在它下面查看.
Click on the small circle and drag it to the left until the circle turns green,to add a left constraint(give a number, say x dp. Repeat it with the other sides and leave the bottom constraint blank if you have another view below it.
根据开发人员站点的说法，您可以将每个视图移动到您想要的位置，而不是在将它们放置在布局中时向每个视图添加约束，然后单击 Infer Constraints 以自动创建约束.更多这里
According to the developers site, Instead of adding constraints to every view as you place them in the layout, you can move each view into the positions you desire, and then click Infer Constraints to automatically create constraints. more here
这篇关于此视图不受垂直约束.在运行时它会跳到左边，除非你添加一个垂直约束的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
