feat: enable R8 minification and upload ReTrace mapping files

[graycreate]

Summary

• Enable R8 minification (minifyEnabled true) and resource shrinking for release builds
• Add comprehensive ProGuard rules for all project dependencies
• Configure proper obfuscation while preserving essential classes

Changes Made

Build Configuration (app/build.gradle)

• ✅ Enable minifyEnabled true (was false)
• ✅ Enable shrinkResources true for additional size reduction
• ✅ Use proguard-android-optimize.txt for better optimization

ProGuard Rules (app/proguard-rules.pro)

• ✅ Add rules for Dagger 2 dependency injection
• ✅ Add rules for ButterKnife view binding
• ✅ Add rules for RxJava2 reactive programming
• ✅ Add rules for custom Fruit HTML parsing library
• ✅ Add rules for RxLifecycle, Logger, analytics libraries
• ✅ Keep data models (network.bean.**) for JSON parsing
• ✅ Keep essential Android classes (Activities, Services, etc.)
• ✅ Allow application classes to be obfuscated while preserving functionality

Benefits

🎯 ReTrace Mapping Files: Enables crash deobfuscation in Google Play Console
📦 Smaller APK Size: Code and resource shrinking reduces app size
🔒 Enhanced Security: Code obfuscation makes reverse engineering harder
🚀 Better Performance: R8 optimizations can improve runtime performance

Testing

• ✅ Local debug build succeeds
• ✅ Release minification completes successfully
• ✅ Mapping files generated: mapping.txt, seeds.txt, usage.txt
• ✅ Essential classes preserved, application classes properly obfuscated
• ✅ All ProGuard rules validated for project dependencies

Validation Steps

Once merged, the next release will:

1. Generate mapping files during build process
2. Upload ReTrace mapping to Google Play Console automatically
3. Enable proper crash stack trace deobfuscation

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

This PR enables R8 minification and resource shrinking for release builds, which was previously disabled due to crashes. The change includes comprehensive ProGuard rules to properly handle obfuscation while preserving essential classes and functionality.

• Enable R8 minification and resource shrinking for release builds
• Add extensive ProGuard rules for all project dependencies (Dagger 2, ButterKnife, RxJava2, etc.)
• Configure proper obfuscation while preserving critical Android components and data models

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
app/build.gradle	Enable minification, resource shrinking, and switch to optimized ProGuard configuration
app/proguard-rules.pro	Add comprehensive ProGuard rules for all project dependencies and Android components

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[Copilot]

These broad RxJava2 rules conflict with the existing specific RxJava3 rules (lines 134-136) and are overly permissive. The existing rules already handle RxJava properly with selective obfuscation. Consider removing these duplicate rules or being more specific about which RxJava2 classes need preservation.

Suggested change

	-keep class io.reactivex.** { *; }
	-keep interface io.reactivex.** { *; }
	-keep,allowobfuscation,allowshrinking class io.reactivex.Flowable
	-keep,allowobfuscation,allowshrinking class io.reactivex.Maybe
	-keep,allowobfuscation,allowshrinking class io.reactivex.Observable
	-keep,allowobfuscation,allowshrinking class io.reactivex.Single

[Copilot]

This rule is overly broad and prevents any obfuscation of Dagger classes. Consider using more specific rules that only keep the essential Dagger classes while allowing others to be obfuscated, such as -keep class dagger.Module and -keep class dagger.Component only.

Suggested change

-keep class dagger.** { *; }

[Copilot]

This rule is overly broad for ButterKnife. The subsequent specific rules (lines 159-165) should be sufficient to handle ButterKnife's annotation processing. Consider removing this blanket rule to allow better obfuscation of ButterKnife internals.

Suggested change

-keep class butterknife.** { *; }

[Copilot]

This rule prevents all obfuscation of the Fruit library. The annotation-specific rules (lines 170-176) should be sufficient for proper functionality. Consider removing this blanket rule to allow obfuscation of non-essential Fruit classes.

Suggested change

-keep class me.ghui.fruit.** { *; }