fix apk total size calculation

[0xera]

I have found that the APK's total size is incorrect and does not match what Android Studio is showing.

[MinhNguyen-nvm]

Hi @0xera, thank a lot for reporting and fixing the issues.
By right, the classDownloadSize should ~equal to the dexDownloadFile. A small different might be because this calculation:

app-sizer/app-sizer/src/main/kotlin/com/grab/sizer/parser/DexFileParser.kt

Line 88 in f57e96b

classes = classes.map { it.copy(downloadSize = (it.size * ratio).toLong()) }.toSet()

Was your project's result largely the difference between Android Studio vs App-sizer report?

[0xera]

Hi. As the size of the application increases, I get more and more different results.

(Before and after fix)

Download size:

• App Sizer sample:
  • AAB mode:
    | apk | 3.941 MB | 3.944 MB
    
  • APK mode:
    | apk | 4.097 MB | 4.100 MB
    
• My app (APK mode):
  | apk | 13.765 MB | 13.778 MB
  
• Another my app (APK mode):
  | apk | 108.818 MB | 108.865 MB
  

Raw Size:

• App Sizer sample:
  • AAB mode:
    | apk | 4.240 MB | 4.255 MB
    
  • APK mode:
    | apk | 4.665 MB | 5.061 MB
    
• My app (APK mode):
  | apk | 21.469 MB | 39.966 MB
  

As you can see, the dexes size calculation is more correct for the size of the downloadable apk (especially for large apk files) and corrects the calculation of the raw size.

[MinhNguyen-nvm]

Let me share a bit of context. As I shared in this document https://grab.github.io/app-sizer/limitation/#class-download-size-calculation

class's download size = class raw size * (dex download size / all classes' raw size)
-> Sum (classes download size ) = (sum(class raw size) * dex download size) / all classes' raw size = dex download size

But there is some minor difference due to the rounded number & floating point number on the calculation.
Anyway, if this helps to have a closer number to the Android Studio report. Let merge
Thanks for contributing