Support for Android java mods

core/src/mindustry/core/Platform.java

@@ -14,10 +14,18 @@ import mindustry.type.*;
 import mindustry.ui.dialogs.*;
 import rhino.*;
 
+import java.net.*;
+
 import static mindustry.Vars.*;
 
 public interface Platform{
 
+    /** Dynamically loads a jar file. */
+    default Class<?> loadJar(Fi jar, String mainClass) throws Exception{
+        URLClassLoader classLoader = new URLClassLoader(new URL[]{jar.file().toURI().toURL()}, ClassLoader.getSystemClassLoader());
+        return classLoader.loadClass(mainClass);
+    }
+
     /** Steam: Update lobby visibility.*/
     default void updateLobby(){}
 
@@ -121,7 +129,7 @@ public interface Platform{
     }
 
     /**
-     * Show a file chooser for multiple file types. Only supported on desktop.
+     * Show a file chooser for multiple file types.
      * @param cons Selection listener
      * @param extensions File extensions to filter
      */

core/src/mindustry/mod/Mods.java

@@ -25,7 +25,6 @@ import mindustry.type.*;
 import mindustry.ui.*;
 
 import java.io.*;
-import java.net.*;
 
 import static mindustry.Vars.*;
 
@@ -634,12 +633,11 @@ public class Mods implements Loadable{
             //make sure the main class exists before loading it; if it doesn't just don't put it there
             if(mainFile.exists()){
                 //mobile versions don't support class mods
-                if(mobile){
-                    throw new IllegalArgumentException("Java class mods are not supported on mobile.");
+                if(ios){
+                    throw new IllegalArgumentException("Java class mods are not supported on iOS.");
                 }
 
-                URLClassLoader classLoader = new URLClassLoader(new URL[]{sourceFile.file().toURI().toURL()}, ClassLoader.getSystemClassLoader());
-                Class<?> main = classLoader.loadClass(mainClass);
+                Class<?> main = platform.loadJar(sourceFile, mainClass);
                 metas.put(main, meta);
                 mainMod = (Mod)main.getDeclaredConstructor().newInstance();
             }else{

core/src/mindustry/net/CrashSender.java

@@ -33,7 +33,7 @@ public class CrashSender{
             + "OS: " + System.getProperty("os.name") + " x" + (OS.is64Bit ? "64" : "32") + "\n"
             + "Java Version: " + System.getProperty("java.version") + "\n"
             + "Java Architecture: " + System.getProperty("sun.arch.data.model") + "\n"
-            + mods.list().size + " Mods: " + mods.list().toString(", ", mod -> mod.name + ":" + mod.meta.version)
+            + mods.list().size + " Mods: " + (mods.list().isEmpty() ? "none" : mods.list().toString(", ", mod -> mod.name + ":" + mod.meta.version))
             + "\n\n" + error;
     }