title: Cannot resolve symbol MathUtils
body: <p>I started a new project on <code>Android Studio</code>, targeting <code>API 26</code>, and did nothing but to add the following line:</p>
  
  <p><code>import android.util.MathUtils;</code></p>
  
  <p>and got the error: <code>Cannot resolve symbol MathUtils</code></p>
  
  <p>Here's my <code>MainActivity.java</code>:</p>
  
  <pre><code>package com.example.HeyJude.test2;
  
  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.util.MathUtils;
  
  public class MainActivity extends AppCompatActivity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
      }
  }
  </code></pre>
  
  <p>And my <code>build.gradle</code>:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 26
      defaultConfig {
          applicationId "com.example.HeyJude.test2"
          minSdkVersion 26
          targetSdkVersion 26
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support:appcompat-v7:26.1.0'
      implementation 'com.android.support.constraint:constraint-layout:1.0.2'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.1'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
  }
  </code></pre>
  
  <p>I tried using <code>File &gt; Invalidate Caches</code> (with restart), but it didn't help. Any other ideas?</p>