优化

app/proguard-rules.pro

@@ -240,6 +240,7 @@
 
 ## 保证该私有变量不被混淆
 -keepclassmembers class com.google.android.exoplayer2.upstream.cache.CacheDataSource$Factory {
+    #noinspection ShrinkerUnresolvedReference
     private DataSource.Factory upstreamDataSourceFactory;
 }