Preview of Android Studio is not playing

Question

I’m having problems importing a project that was written in an older version of Android Studio. My preview doesn’t appear. I’m a beginner and would like a little help! Follow Gradle and xml. Activity is standard, only has onCreate, in the emulator the application runs normal.

apply plugin: 'com.android.application'

android { compileSdkVersion 23 buildToolsVersion '27.0.3'

defaultConfig {
    applicationId "com.example.android.miwok"
    minSdkVersion 15
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

}

dependencies {
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:support-v4:23.3.0'
compile 'com.android.support:design:23.3.0'

}

Answer 1

Constraintlayout is a Viewgroup that allows you to flexibly position and scale widgets.

It is not in your xml code. It should be where you put the comment and the closure at the end of the code.