Merge pull request #8459 from WonderzGmbH:fix/8253-cache-exception

PiperOrigin-RevId: 352450607

library/core/src/main/java/com/google/android/exoplayer2/upstream/cache/SimpleCache.java

@@ -837,7 +837,8 @@ public final class SimpleCache implements Cache {
   }
 
   private static void createCacheDirectories(File cacheDir) throws CacheException {
-    if (!cacheDir.mkdirs()) {
+    // If mkdirs() returns false, double check that the directory doesn't exist before throwing.
+    if (!cacheDir.mkdirs() && !cacheDir.isDirectory()) {
       String message = "Failed to create cache directory: " + cacheDir;
       Log.e(TAG, message);
       throw new CacheException(message);