You only need one slash. You see this if you build with `Uri.Builder`:
```java
new Uri.Builder()
  .scheme("assets")
  .path("dir")
  .path("subdir")
  .path("image.png")
  .build()
```
Produces: `assets:/dir/subdir/image.png`
And then calling `getPath()` yields: `/dir/subdir/image.png`