音频预缓存

app/proguard-rules.pro

@@ -228,4 +228,7 @@
 -keep public class org.chromium.net.* {
     !private *;
     *;
-}
+}
+
+## 保证该私有变量不被混淆
+-keepclassmembers class com.google.android.exoplayer2.upstream.cache.CacheDataSource$Factory{upstreamDataSourceFactory;}