相关疑难解决方法(0)

常见的用途LinearLayout是均匀地分隔(加权)视图,例如:

如何使用新的实现均匀分布的视图ConstraintLayout？

ConstraintLayout链接供参考:博客文章,I/O会话视频

我收到以下错误,我使用Android工作室2.2预览3.我搜索谷歌但找不到任何资源.

Error: This view is not constrained, it only has design time positions, so it will jump to (0,0) unless you add constraints

<TextView
        android:layout_width="384dp"
        android:layout_height="207dp"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/calc_default_display"
        android:id="@+id/textView"
        android:background="#ffffff"
        android:layout_margin="0dp"
        android:gravity="bottom|end"
        android:textSize="70sp"
        android:nestedScrollingEnabled="false"
        android:maxLines="2"
        android:maxLength="17"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="0dp" />

Android Studio 2.2中的新布局编辑器会在EditText和Buttons等视图上显示此错误.此外,任何有助于使用新约束布局入门的链接都将受到赞赏.

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>