Reduce apk size with Proguard and Linking

Android
1

Hello,

I would like to reduce apk size with Proguard and linking. I enabled Proguard just with few extra rules

# General Android
-dontwarn org.apache.http.**
-dontwarn android.net.http.AndroidHttpClient
-keep public class com.google.android.gms.* { public *; }
-dontwarn com.google.android.gms.**

I also enabled Linking to Sdk Assemblies Only and it works like a charm. When I tried to be more aggresive with reducing apk, I changed Linking to Sdk and User Assemblies. It significantly reduced apk size but now game crashes with exception:

AndroidRuntime    android.runtime.JavaProxyThrowable: Microsoft.Xna.Framework.Content.ContentLoadException: Could not load countriesDecoder asset as a non-content file! ---> Microsoft.Xna.Framework.Content.ContentLoadException: Could not find ContentTypeReader Type. Please ensure the name of the Assembly that contains the Type matches the assembly in the full type name: Microsoft.Xna.Framework.Content.ReflectiveReader`1[...]
  at Microsoft.Xna.Framework.Content.ContentTypeReaderManager.LoadAssetReaders (Microsoft.Xna.Framework.Content.ContentReader reader) [0x00223] in <e1bc6c4bba77484cb5c5e3d8d8976b97>:0 
  at Microsoft.Xna.Framework.Content.ContentReader.InitializeTypeReaders () [0x0000b] in <e1bc6c4bba77484cb5c5e3d8d8976b97>:0 
  at Microsoft.Xna.Framework.Content.ContentReader.ReadAsset[T] () [0x00000] in <e1bc6c4bba77484cb5c5e3d8d8976b97>:0 
  at Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T] (System.String assetName, System.Action`1[T] recordDisposableObject) [0x00083] in <e1bc6c4bba77484cb5c5e3d8d8976b97>:0 
   --- End of inner exception stack trace ---
  at Microsoft.Xna.Framework.Content.ContentManager.ReadAsset[T] (System.String assetName, System.Action`1[T] recordDisposableObject) [0x00104] in <e1bc6c4bba77484cb5c5e3d8d8976b97>:0 
  at Microsoft.Xna.Framework.Content.ContentManager.Load[T] (System.String assetName) [0x0005a] in <e1bc6c4bba77484cb5c5e3d8d8976b97>:0 
...

Generally, it has problem with loading any of assets. I decompiled generated apk at it looks that proper Assets/Content folder is attached. I will appriciate any help from you, cause I’m not experienced with this scope of Xamarin / Monogame.

2

Linker is too aggresive because it doesn’t know about reflection.
Hint: “Could not find ContentTypeReader Type…”
You might try manually preserving that and other types that might get removed by mistake.
Check out this page
enter link description here