开启minifyEnabled后Android应用调用AWS DynamoDB崩溃，求补充ProGuard规则

从你的崩溃日志和配置来看，问题核心在于ProGuard混淆了DynamoDB实体类的关键注解或字段名，导致DynamoDBMapper无法识别查询所需的哈希键（Hash Key），从而抛出IllegalArgumentException: Illegal query expression: No hash key condition is found in the query错误。

你当前的ProGuard规则仅保留了AWS相关类的名称（-keepnames），但没有覆盖实体类的字段、方法以及DynamoDB核心注解的保留，这是导致崩溃的关键缺失。以下是需要补充的规则：

必须添加的ProGuard规则 #

1. 保留你的DynamoDB实体类及其注解/字段
   把com.yourpackage.dynamodb.models替换成你项目中实际存放DynamoDB实体类的包路径（比如com.icefield.eventtruly.db.entities）：

   # Keep all DynamoDB entity classes, their fields, annotations and constructors
   -keep class com.yourpackage.dynamodb.models.** {
       @com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.* <fields>;
       @com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.* <methods>;
       <init>(...);
   }
   

   这条规则确保实体类的字段、带DynamoDB注解的方法，以及构造函数不会被混淆或移除——DynamoDBMapper正是通过这些信息识别哈希键和数据映射关系。

2. 保留DynamoDBMapper核心类与注解
   添加以下规则防止核心映射类和注解被ProGuard处理：

   # Keep DynamoDB mapper and related expression classes
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper {
       public <methods>;
   }
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBQueryExpression
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBScanExpression
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBHashKey
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBRangeKey
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBIndexHashKey
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBAttribute
   -keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBTable
   

3. 优化原有基础规则
   将你原有的-keepnames class com.amazonaws.**和-keepnames class com.amazon.**替换为更严格的-keep规则，同时保留所有注解：

   # Keep AWS SDK classes and annotations required for reflection
   -keep class com.amazonaws.** { *; }
   -keep class com.amazon.** { *; }
   -keepattributes *Annotation*
   

   -keepattributes *Annotation*是关键，它确保所有注解不会被ProGuard移除，而DynamoDB的映射逻辑完全依赖这些注解。

修改后的完整proguard-rules.pro示例 #

# Keep AWS SDK classes and annotations required for reflection
-keep class com.amazonaws.** { *; }
-keep class com.amazon.** { *; }
-keepattributes *Annotation*

# Keep DynamoDB entity classes, their fields, annotations and constructors
-keep class com.yourpackage.dynamodb.models.** {
    @com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.* <fields>;
    @com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.* <methods>;
    <init>(...);
}

# Keep DynamoDB mapper and related expression classes
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBMapper {
    public <methods>;
}
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBQueryExpression
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBScanExpression
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBHashKey
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBRangeKey
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBIndexHashKey
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBAttribute
-keep class com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.DynamoDBTable

# Enums are not obfuscated correctly in combination with Gson
-keepclassmembers enum * { *; }

# Request handlers defined in request.handlers
-keep class com.amazonaws.services.**.*Handler

# The following are referenced but aren't required to run
-dontwarn com.fasterxml.jackson.**
-dontwarn org.apache.http.**
-dontwarn com.amazonaws.http.**
-dontwarn com.amazonaws.metrics.**

验证步骤 #

1. 将规则中的com.yourpackage.dynamodb.models替换为你项目的实际实体类包路径
2. 确保build.gradle中minifyEnabled = true
3. 重新构建并运行应用，测试DynamoDB查询功能，确认崩溃不再发生

内容的提问来源于stack exchange，提问作者icefield