此视图在垂直方向上不受约束.在运行时，除非您添加垂直约束，否则它将跳到左侧 [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中的新版式编辑器始终在诸如EditText和Buttons之类的视图上显示此错误.友善的帮助.此外，任何有助于新约束布局入门的链接都将受到赞赏.

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性能(从技术上讲，您不必为不同的屏幕尺寸进行更改，没有重叠，就像在移动设备上以及在具有相同约束条件的标签页上都显示为魅力).以下是在使用新版式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.

单击小圆圈并将其向左拖动，直到圆圈变为绿色为止，以添加一个左约束(给一个数字，例如x dp.在另一侧重复该约束，如果还有其他约束则将底部约束留为空白在它下面查看.

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.

根据开发人员网站的介绍，可以将每个视图移动到所需的位置，然后单击推断约束"以自动创建约束，而不是将约束放置到布局中时向每个视图添加约束.更多此处

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

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