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To keep reflection and serialization working after obfuscation, preserve only the classes, members, and metadata that runtime code actually discovers—and test the transformed release build. There is no universally safe ProGuard or R8 rule: the right configuration depends on the runtime, obfuscator and mode, serializer, library versions, and whether dependencies already provide keep rules.
Start by identifying the exact stack
Before writing a rule, record the runtime and platform, obfuscator and its mode, serializer and version, and whether libraries supply consumer rules. The Android examples below apply to R8 and are starting points, not copy-paste rules for an unspecified app. The .NET example concerns a separate trimming behavior; Android keep syntax does not apply to it.
Inventory what runtime code discovers
Static analysis can miss reflection when a program builds class or member names dynamically. A shrinker may remove something that appears unused, or rename it so a string-based lookup no longer matches. For each reflective entry point, write down what must remain stable: the class or member’s presence, its name, its constructor, annotations, generic signature, or another piece of metadata.
- Search for
Class.forName, reflective constructor calls, andgetDeclaredFieldorgetDeclaredMethod. - Find annotation scans, serializer model fields, generic type tokens, JNI upcalls, and framework callbacks or convention-based method calls.
- For plugin or dependency loading, determine whether code identifies implementations by class name, interface, registration metadata, or another mechanism.
Android’s keep-rules guide covers class-by-name lookup, annotation-based access, private reflected members, and Parcelable patterns. These mechanisms need not all be preserved in the same way.
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Choose the narrowest Android keep rule that fits
R8 rules control different things. A -keep rule can stop matched items from being removed or renamed; -keepclassmembers preserves matched members only on classes that remain. A narrower rule can leave more shrinking and optimization available than keeping an entire class and all its members. See Android’s keep-rule reference for rule behavior and scope.
Class found by a name string
If code loads a class by a literal or constructed string and invokes its no-argument constructor, preserve that class and constructor under the name the lookup expects. If lookup instead selects implementations of a shared interface, a rule aimed at those implementations and constructors may be narrower than retaining every application class. Verify which class names the runtime actually requests.
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Specific field or method found by name
When code looks up a member by a literal name, preserve that member on its exact declaring class, with the correct signature and name. Do not default to -keep class X { *; } if only one member is required: broad rules can constrain optimization unnecessarily. Annotation scans also need their relevant annotations and annotated elements to survive as required by the framework.
Conditional model rules
Where models can be identified by a marker such as fields annotated with @SerializedName, a conditional or annotation-based rule can target only matching models or members. The appropriate pattern depends on the R8 and Gson versions; consult Android’s library optimization guidance and check what the library already contributes before adding app rules.
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Gson with R8: check annotations, constructors, and signatures
Android’s current guidance says Gson 2.11 and later bundle rules for fields annotated with @SerializedName. Check the version actually resolved by the project and inspect bundled rules before maintaining redundant app rules. An explicit serialized name can mean the source field name does not need to remain unchanged, but confirm the model and serializer behavior rather than assuming.
Constructor requirements are a separate part of the contract: if deserialization relies on a constructor, ensure it remains available as needed. In R8 full mode, Android’s Gson example also requires the generic Signature attribute for a TypeToken pattern. Keep that metadata when the pattern needs it, and add other attributes only when the runtime or library requires them. Follow the version-specific Android Gson guidance rather than applying a generic rule to every project.
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Account for generated Android code and Parcelable
@Parcelize generates rules automatically, according to Android’s reference guide. A manual Parcelable implementation may need its CREATOR field preserved. Check whether generated or dependency-provided consumer rules already cover the project before duplicating them.
.NET 8 trimming is a different configuration problem
Obfuscation and trimming are related transformations, but they are not interchangeable. Microsoft documents that .NET 8 projects using PublishTrimmed turn off reflection-based System.Text.Json defaults, which can break reflection-based serialization. Microsoft’s .NET 8 compatibility note documents the JsonSerializerIsReflectionEnabledByDefault project property for restoring the previous behavior when reflection is required. Evaluate that choice against the current target-framework guidance and consider source-generated serialization where appropriate; Android keep rules do not solve this .NET behavior.
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Validate the transformed artifact
Test a release-like build made with the same shrinker or obfuscator settings used for release. Tests against an untransformed debug build do not establish that reflection or serialization still works after transformation.
Quick Recap
- Build with the intended release configuration and tool mode.
- Exercise serialization and deserialization, including round trips for relevant models and generic types.
- Exercise reflective class discovery, constructor invocation, and member access, plus optional dependency or plugin loading and framework callbacks used by the app.
- If a path fails, inspect shrinker diagnostics and mapping or removal outputs to determine what was removed or renamed. Adjust the narrow rule for that contract and rebuild.
- Keep tests tied to the actual transformed artifact and dynamic paths the application uses. Passing tests provide evidence for those paths and settings, not a guarantee for every runtime path.
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