拖放组件在android studio的预览中不可见

问题描述

我是安卓开发的初学者.我已经创建了一个 android 项目.但是在预览部分，我看不到组件. 但是当我在模拟器上运行相同的应用程序时组件是可见的，我能够看到这些组件.我在这里缺少一些设置?下面给出了 XML.

I am a beginner in android development. I have created a android project. But in the preview section, I am not able to see the components. But components are visible when i run the same app on emulator i am able to see the components. I am missing some setting here? XML is given below.

<?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"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</android.support.constraint.ConstraintLayout>

推荐答案

我也遇到过这个问题，只选择了另一个主题"原因就解决了默认主题 appTheme 不显示添加的项目.如果您即选择半透明，则任何项目都将可见 ;-)

I've had have also this problem and solved it by only selecting another "Theme" causethe default theme appTheme doesn't show added items.If you i.e. select Transulcent, any item becomes visible ;-)

干杯奥利万

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