Android：使用Gson投射字符串（proguard） [英] Android: Cast String with Gson (proguard)

问题描述

我使用下面的代码将一个字符串（包含json）转换为一个Object（Category）：

I use the below code to cast a string (containing json) into an Object (Category):

String jsonInfo = "{'id':'GAME','name':'game','subCategories':[{'subId':'ALL','subName':'All games'},{'subId':'SOCIAL','subName':'Social game'}]}";

Category xx = getCategory(jsonInfo);

//method for casting string into Category
public Category getCategory (String json){
    Category myObject ;
    myObject = new Gson().fromJson(json, Category.class);
}

我的分类类别：

My Category Class :

public class Category extends MasterDomain {

    public String id;
    public String name;
    public List<SubCategory> subCategories;

    public Category() {

    }

    public Category(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<SubCategory> getSubCategories() {
        return subCategories;
    }

    public void setSubCategories(List<SubCategory> subCategories) {
        subCategories = subCategories;
    }

}

当我使用密钥库导出应用程序，类别对象生成完美，应用程序工作。但是，使用proguard时，subCategories中填充了Object对象。

When I export application with the keystore, Category object is generated perfectly and application works. However, when using proguard, "subCategories" is filled with "Object" object.

日志文件：

Log file :

09-13 14:46:42.313: W/System.err(31631): java.lang.ClassCastException: java.lang.Object cannot be cast to jp.xxx.DB.domains.SubCategory

我的程序文件：

-optimizationpasses 2 
-dontusemixedcaseclassnames 
-dontskipnonpubliclibraryclasses 
-dontpreverify 
-verbose 
-dump class_files.txt 
-printseeds seeds.txt 
-printusage unused.txt 
-printmapping mapping.txt 

# The -optimizations option disables some arithmetic simplifications that Dalvik 1.0 and 1.5 can't handle. 
-optimizations !code/simplification/arithmetic 

# Basic elements 
-keep public class * extends android.app.Activity 
-keep public class * extends android.app.Application 
-keep public class * extends android.app.Service 
-keep public class * extends android.content.BroadcastReceiver 
-keep public class * extends android.content.ContentProvider 
-keep public class com.google.gson.Gson

# for views
-keep public class * extends View { 
public <init>(android.content.Context); 
public <init>(android.content.Context, android.util.AttributeSet); 
public <init>(android.content.Context, android.util.AttributeSet, int); 
public void set*(...); 
}

# Enumerations 
-keepclassmembers enum  * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
} 

# for gson (GSON @Expose annotation)
-keepattributes *Annotation*
-keep class sun.misc.Unsafe { *; }
-keep class com.google.gson.stream.** { *; }
-keep class com.google.gson.examples.android.model.** { *; }

-dontwarn org.w3c.dom.bootstrap.**
-dontwarn org.joda.**

# external libraries
-libraryjars   libs/android-support-v4.jar
-libraryjars   libs/gson-1.7.1.jar
-libraryjars   libs/jp.maru.mrd-1.1.1.jar
-libraryjars   libs/libGoogleAnalyticsV2.jar

# for google analytics & campaign tool
-keep class com.google.android.gms.analytics.**
-keep class com.google.analytics.tracking.**
-dontwarn com.google.android.gms.analytics.**
-dontwarn com.google.analytics.tracking.**

# for parcebable objects
-keep class jp.xxx.DB.domains.** {
    *;
}

-keepattributes SourceFile, LineNumberTable

我有保存我的类别和子类别类（在jp.xxx.DB.domains包中），但投射失败。

I have "kept" my Category and SubCategory classes (in the jp.xxx.DB.domains package) but cast failed.

任何想法？
谢谢

Any ideas ? Thank you

推荐答案

Json使用反射来检索getters和setters的通用签名。 ProGuard在默认情况下会丢弃这些内容，因此您应该告诉它以保留它们：

Json uses reflection to retrieve the generic signatures of the getters and setters. ProGuard discards those by default, so you should tell it to preserve them:

-keepattributes Signature

请注意，Android SDK的最新版本已弃用 proguard.cfg ，转而支持一个基本上为空的文件 proguard-project.txt ，其中大部分配置位于共享内部配置文件中（全部在 project.properties中指定）。

Note that recent versions of the Android SDK have deprecated proguard.cfg in favor of a file proguard-project.txt that is essentially empty, with the bulk of the configuration in a shared internal configuration file (all specified in project.properties).

此外，您不应该添加 -injars 或 -libraryjars 选项，因为标准的Ant / Eclipse / Gradle构建过程会自动为您指定这些选项。

Furthermore, you should not add -injars or -libraryjars options to your configuration, since the standard Ant/Eclipse/Gradle build processes automatically specify these for you.

这篇关于Android：使用Gson投射字符串（proguard）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！