[DISABLED] Add experimental support for proguard.

app_pojavlauncher/proguard-rules.pro

@@ -15,4 +15,13 @@
 #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
 #   public *;
 #}
--keep class !android.support.v7.internal.view.menu.**,android.support.** {*;}
+
+# We use Reflection on the builder to avoid creating too many objects
+ -keep class net.objecthunter.exp4j.ExpressionBuilder**
+ -keepclassmembers class net.objecthunter.exp4j.ExpressionBuilder** {
+    *;
+ }
+# Option screens
+ -keep class net.kdt.pojavlaunch.prefs.screens** {*;}
+
+

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/ExitActivity.java

@@ -4,10 +4,12 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 
+import androidx.annotation.Keep;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 
+@Keep
 public class ExitActivity extends AppCompatActivity {
     public static void showExitMessage(Context ctx, int code) {
         Intent i = new Intent(ctx,ExitActivity.class);

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/JMinecraftVersionList.java

@@ -1,9 +1,12 @@
 package net.kdt.pojavlaunch;
 
+import androidx.annotation.Keep;
+
 import java.util.Map;
 import net.kdt.pojavlaunch.value.*;
 import java.util.*;
 
+@Keep
 public class JMinecraftVersionList {
     public static final String TYPE_OLD_ALPHA = "old_alpha";
     public static final String TYPE_OLD_BETA = "old_beta";
@@ -12,6 +15,7 @@ public class JMinecraftVersionList {
     public Map<String, String> latest;
     public Version[] versions;
 
+    @Keep
     public static class Version {
         // Since 1.13, so it's one of ways to check
         public Arguments arguments;
@@ -34,15 +38,19 @@ public class JMinecraftVersionList {
         public String url;
         public String sha1;
     }
+    @Keep
     public static class JavaVersionInfo {
         public String component;
         public int majorVersion;
     }
+
     // Since 1.13
+    @Keep
     public static class Arguments {
         public Object[] game;
         public Object[] jvm;
 
+        @Keep
         public static class ArgValue {
             public ArgRules[] rules;
             public String value;
@@ -50,12 +58,14 @@ public class JMinecraftVersionList {
             // TLauncher styled argument...
             public String[] values;
 
+            @Keep
             public static class ArgRules {
                 public String action;
                 public String features;
             }
         }
     }
+    @Keep
     public static class AssetIndex {
         public String id, sha1, url;
         public long size, totalSize;

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/Logger.java

@@ -1,5 +1,7 @@
 package net.kdt.pojavlaunch;
 
+import androidx.annotation.Keep;
+
 import java.io.File;
 import java.io.IOException;
 import java.io.PrintStream;
@@ -8,6 +10,7 @@ import java.lang.ref.WeakReference;
 /** Singleton class made to log on one file
  * The singleton part can be removed but will require more implementation from the end-dev
  */
+@Keep
 public class Logger {
     private static Logger loggerSingleton = null;
 

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/customcontrols/ControlData.java

@@ -17,6 +17,11 @@ import org.lwjgl.glfw.*;
 import static net.kdt.pojavlaunch.LWJGLGLFWKeycode.GLFW_KEY_UNKNOWN;
 import static org.lwjgl.glfw.CallbackBridge.sendKeyPress;
 
+import androidx.annotation.Keep;
+
+import com.google.gson.annotations.SerializedName;
+
+@Keep
 public class ControlData {
 
     public static final int SPECIALBTN_KEYBOARD = -1;
@@ -250,7 +255,9 @@ public class ControlData {
             expression = new WeakReference<>(builder.get().getClass().getDeclaredField("expression"));
             expression.get().setAccessible(true);
             expression.get().set(expression.get(), expression.get().getModifiers() & ~Modifier.FINAL);
-        }catch (Exception ignored){}
+        }catch (Exception e){
+            e.printStackTrace();
+        }
     }
 
     /**

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/customcontrols/ControlDrawerData.java

@@ -10,14 +10,16 @@ import static net.kdt.pojavlaunch.customcontrols.ControlDrawerData.Orientation.R
 import static net.kdt.pojavlaunch.customcontrols.ControlDrawerData.Orientation.UP;
 import static net.kdt.pojavlaunch.customcontrols.ControlDrawerData.Orientation.FREE;
 
-import androidx.annotation.NonNull;
+import androidx.annotation.Keep;
 
+@Keep
 public class ControlDrawerData {
 
     public ArrayList<ControlData> buttonProperties;
     public ControlData properties;
     public Orientation orientation;
 
+    @Keep
     public enum Orientation {
         DOWN,
         LEFT,

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/customcontrols/CustomControls.java

@@ -1,5 +1,8 @@
 package net.kdt.pojavlaunch.customcontrols;
 import android.content.*;
+
+import androidx.annotation.Keep;
+
 import com.google.gson.*;
 
 import java.io.IOException;
@@ -7,6 +10,7 @@ import java.util.*;
 import net.kdt.pojavlaunch.*;
 import org.lwjgl.glfw.*;
 
+@Keep
 public class CustomControls {
 	public int version = -1;
     public float scaledAt;

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/tasks/RefreshVersionListTask.java

@@ -47,10 +47,10 @@ public class RefreshVersionListTask extends AsyncTask<Void, Void, ArrayList<Stri
                 mActivity.mVersionList.versions = versions.toArray(new JMinecraftVersionList.Version[versions.size()]);
                 Log.i("ExtVL","Final list size: " + mActivity.mVersionList.versions.length);
             }
-            ArrayList<String> versionStringList = filter(mActivity.mVersionList.versions, new File(Tools.DIR_HOME_VERSION).listFiles());
 
-            return versionStringList;
+            return filter(mActivity.mVersionList.versions, new File(Tools.DIR_HOME_VERSION).listFiles());
         } catch (Exception e){
+            System.out.println("Refreshing version list failed !");
             e.printStackTrace();
         }
         return null;

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/value/DependentLibrary.java

@@ -1,12 +1,15 @@
 package net.kdt.pojavlaunch.value;
 
+import androidx.annotation.Keep;
+
+@Keep
 public class DependentLibrary {
     public String name;
 	public LibraryDownloads downloads;
     public String url;
 
-	public static class LibraryDownloads
-	{
+    @Keep
+	public static class LibraryDownloads {
 		public MinecraftLibraryArtifact artifact;
 		public LibraryDownloads(MinecraftLibraryArtifact artifact) {
 			this.artifact = artifact;