预览模式未显示任何内容在Android Studio的“设计”选项卡中的设备预览中？

Question

I JUST UPDATED MY ANDROID STUDIO AND FACING THIS PROBLEM:
this is what i am getting at design tab no device at all in preview can't acess API levels enter image description here the theme selection is just showing this , no description in right hand side

the text section of activity_main contains:

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/activity_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:paddingBottom="@dimen/activity_vertical_margin"
        tools:context="com.example.akash.myapplicationddd.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />
</RelativeLayout>

this is my gradle(project):

    buildscript {
    repositories {
        jcenter()
    }
dependencies {
    classpath 'com.android.tools.build:gradle:2.2.0'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }  
}

task clean(type: Delete) { delete rootProject.buildDir enter code here }

Answer 1

please change your gradle file

dependencies {
 classpath 'com.android.tools.build:gradle:2.2.0'

// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}

change to your updated studio version