feat(android): allow building exoplayer from source (#3932)

* feat(android): allow to build from source code

* fix(android): allow to build plugin from source

examples/basic/android/app/build.gradle

@@ -81,12 +81,20 @@ android {
     compileSdkVersion rootProject.ext.compileSdkVersion
 
     namespace "com.videoplayer"
+
+    compileOptions {
+        // These options are necessary to be able to build fro source
+        coreLibraryDesugaringEnabled true
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
+    }
     defaultConfig {
         applicationId "com.videoplayer"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
         versionCode 1
         versionName "1.0"
+        multiDexEnabled true
     }
     signingConfigs {
         debug {
@@ -147,6 +155,8 @@ dependencies {
             because("kotlin-stdlib-jdk8 is now a part of kotlin-stdlib")
         }
     }
+    // coreLibraryDesugaring is mandatory to be able to build exoplayer from source
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
 }
 
 apply from: file("../../node_modules/@react-native-community/cli-platform-android/native_modules.gradle"); applyNativeModulesAppBuildGradle(project)