title: Android API 26 Platform not found, package not available for download
body: <p><img src="https://i.stack.imgur.com/Ads03.png" alt="Error image.">This occurred after I upgraded my android studio. I've attempted all similar answers on stack overflow, and a few other obscure forums, but I'm not getting anywhere with this error and I've been at it for 6 hours. I've monkeyed around with the sdk tools manager as well, but I'm not getting anywhere. Oh, and that maven thing is new, tried it from a similar answer.</p>
  
  <p>Here is my gradle file:</p>
  
  <pre><code>android {
      compileSdkVersion 26
      buildToolsVersion "26.0.0"
      defaultConfig {
          applicationId "com.loredylore.lorebuilder"
          minSdkVersion 15
          targetSdkVersion 26
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
          vectorDrawables.useSupportLibrary = true
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      compile fileTree(include: ['*.jar'], dir: 'libs')
      androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
          exclude group: 'com.android.support', module: 'support-annotations'
      })
      compile 'com.android.support:appcompat-v7:26.0.0-alpha1'
      compile 'com.android.support:design:26.0.0-alpha1'
      compile 'com.android.support.constraint:constraint-layout:1.0.2'
      compile 'com.android.support:support-v4:26.0.0-alpha1'
      compile 'com.android.support:support-vector-drawable:26.0.0-alpha1'
      compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'
      compile 'com.google.firebase:firebase-auth:11.0.2'
      compile 'com.google.firebase:firebase-core:11.0.2'
      compile 'com.google.firebase:firebase-database:11.0.2'
      compile 'com.google.firebase:firebase-crash:11.0.2'
      compile 'com.google.firebase:firebase-storage:11.0.2'
      compile 'com.android.support:support-annotations:26.0.0-alpha1'
      //new
      testCompile 'junit:junit:4.12'
  
  }
  
  allprojects {
      repositories {
          jcenter()
          maven {
              url "https://maven.google.com"
          }
      }
  }
  
  // Add to the bottom of the file
  apply plugin: 'com.google.gms.google-services'
  </code></pre>