title: How to fix This "All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes)"
body: <p>I am creating an app that uses firebase authentication for login and registration but I keep getting sudden crashes as soon as I run the application. I'm getting a warning in my Gradle.build file at the app level. The warning says </p>
  
  <blockquote>
    <p>All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0, 26.1.0. Examples include com.android.support:animated-vector-drawable:28.0.0 and com.android.support:support-media-compat:26.1.0</p>
  </blockquote>
  
  <p>I've tried changing com.android.support:appcompat-v7:28.0.0 to v7:26.0.1 and 27.1.0 but none of them solved the problem.</p>
  
  <p>My build.gradle file is as follows:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.project.tck.rescueme_responder"
          minSdkVersion 14
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.2'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
      implementation 'com.google.firebase:firebase-core:16.0.6'
      implementation 'com.google.firebase:firebase-auth:16.1.0'
      implementation 'com.google.android.gms:play-services-auth:16.0.1'
  }
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>I expect a login that authenticates using FireBase when I run the application but then the application crashes each time I run it.</p>