title: Symbol ExoPlayerFactory not found
body: <p>I am going insane trying to figure this out. It makes no sense at all. I have added the required implementation in my <code>build.gradle</code> file and synced it up just fine, but when I try to use ExoPlayer it isn't found. I have even tried manually entering in the import line using auto-complete and the only things available in auto-complete for <code>com.google.android.exoplayer2</code> are <code>Buildconfig</code> and <code>R.</code> I don't know what is going on. I had a project that used it and everything was great. I hadn't opened it in a long time, but wanted to re-learn it, so I opened it, now no matter what I do it can't find the symbol for ExoPlayer.</p>
  
  <p>Here is my <code>build.gradle</code> file...</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "test.notreal.justatext"
          minSdkVersion 21
          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'
          }
      }
      sourceSets {
          main {
              jniLibs.srcDirs = ['libs']
          }
      }
      compileOptions {
          targetCompatibility JavaVersion.VERSION_1_8
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      androidTestImplementation('com.android.support.test.espresso:espresso-core:2.2.2', {
          exclude group: 'com.android.support', module: 'support-annotations'
      })
  
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support:animated-vector-drawable:28.0.0'
      implementation 'com.android.support:cardview-v7:28.0.0'
      implementation 'com.android.support:recyclerview-v7:28.0.0'
      implementation 'com.android.support:design:28.0.0'
      implementation 'com.android.support:support-v13:28.0.0' //THIS
      implementation 'com.android.support:support-media-compat:28.0.0' //AND THIS
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      implementation 'com.google.firebase:firebase-core:16.0.9'
      implementation 'com.google.firebase:firebase-auth:17.0.0'
      implementation 'com.google.firebase:firebase-database:17.0.0'
      implementation 'com.google.firebase:firebase-storage:17.0.0'
      implementation 'de.hdodenhof:circleimageview:1.3.0'
      implementation 'com.soundcloud.android:android-crop:1.0.1@aar'
      implementation 'com.jakewharton:butterknife:9.0.0-rc2'
      annotationProcessor 'com.jakewharton:butterknife-compiler:9.0.0-rc2'
      implementation 'com.github.jd-alexander:LikeButton:0.2.3'
      implementation 'com.github.bumptech.glide:glide:4.8.0'
      implementation 'fr.tvbarthel.blurdialogfragment:lib:2.2.0'
      implementation 'com.android.support:support-v4:28.0.0'
      implementation 'com.squareup.picasso:picasso:2.5.2'
      implementation 'com.nineoldandroids:library:2.4.0'
      implementation 'com.scottyab:aescrypt:0.0.1'
      implementation 'com.daimajia.slider:library:1.1.5@aar'
      implementation 'com.google.firebase:firebase-messaging:18.0.0'
      implementation 'com.google.android.exoplayer:exoplayer:r2.5.0' //RIGHT HERE
      implementation 'com.bignerdranch.android:recyclerview-multiselect:0.2'
      implementation 'com.theartofdev.edmodo:android-image-cropper:2.5.+'
      testImplementation 'junit:junit:4.12'
      implementation 'jp.co.cyberagent.android.gpuimage:gpuimage-library:1.4.1'
      implementation 'jp.wasabeef:glide-transformations:3.0.1'
  
  }
  
  
  
  
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>In it you can see ...</p>
  
  <pre><code>implementation 'com.google.android.exoplayer:exoplayer:r2.5.0'
  </code></pre>
  
  <p>and the app will do gradle sync properly, but in my app all of the following is red...</p>
  
  <pre><code>import com.google.android.exoplayer2.ExoPlayerFactory;
  import com.google.android.exoplayer2.SimpleExoPlayer;
  import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
  import com.google.android.exoplayer2.extractor.ExtractorsFactory;
  import com.google.android.exoplayer2.source.ExtractorMediaSource;
  import com.google.android.exoplayer2.source.MediaSource;
  import com.google.android.exoplayer2.trackselection.AdaptiveTrackSelection;
  import com.google.android.exoplayer2.trackselection.DefaultTrackSelector;
  import com.google.android.exoplayer2.trackselection.TrackSelection;
  import com.google.android.exoplayer2.trackselection.TrackSelector;
  import com.google.android.exoplayer2.ui.SimpleExoPlayerView;
  import com.google.android.exoplayer2.upstream.BandwidthMeter;
  import com.google.android.exoplayer2.upstream.DataSource;
  import com.google.android.exoplayer2.upstream.DefaultBandwidthMeter;
  import com.google.android.exoplayer2.upstream.DefaultDataSourceFactory;
  import com.google.android.exoplayer2.util.Util;
  </code></pre>
  
  <p>Everything after the exoplayer2. is red. It can't find the symbol for anything. In an attempt to assure myself I wasn't going nuts I started a new project, added the implementation for exoplayer in my fresh clean build.gradle file, opened up the main activity and type in </p>
  
  <pre><code>SimpleExoPlayer player = ExoPlayerFactory.newSimpleInstance(this);
  </code></pre>
  
  <p>And it cannot find the symbol. Can't import it, it still just shows the <code>BuildConfig</code> and <code>R</code> symbols for everything after the <code>com.google.android.exoplayer2.</code> I have tried updating to a newer version like 2.10.1, which causes build failures something about merging the android manifests failing, on a brand new clean app. So I can't update the version, but all of a sudden no matter what I do Android Studio can't find ExoPlayer symbols. </p>