Gradle file does not build / sync with current Android Studio

[kwhitejr]

The build.gradle file for app returns numerous warnings from Android Studio 3.1.2.

After following Android Studio's instructions for fixing critical errors, invalidating and clearing cache, Android Studio still does not properly import various packages (e.g. import android.support.v7.app.AppCompatActivity).

Full list of failed imports: import android.support.design.widget.FloatingActionButton; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v4.content.FileProvider; import android.support.v7.app.AppCompatActivity;

[kwhitejr]

Updated to AS 3.1.3 and got Emojify to build with the following app.gradle.build: apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion '27.0.3'
    defaultConfig {
        applicationId "com.example.android.emojify"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    implementation 'com.android.support:design:26.1.0'
    implementation 'com.android.support:appcompat-v7:26.0.0-beta1'
    implementation 'com.google.android.gms:play-services-vision:15.0.2'
    implementation 'com.jakewharton:butterknife:8.8.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
    implementation 'com.jakewharton.timber:timber:4.7.0'
    testCompile 'junit:junit:4.12'
}

No thanks to useless Udacity support. @udacity-design-engineering Update your repos.