Proguard在Android应用程序中使用R类进行反射不再有效

Question

我已经在我的项目中激活了proguard,因为我试图在Google Play上发布它.即使proguard-android.txt有

-keepclassmembers class **.R$* {
public static <fields>;

}

这意味着它不应该混淆我需要的R.raw类,我发现在运行这段代码时

import headwayEnt.Blackhole_Darksun.R;

private static final String RES_PATH = "headwayEnt.Blackhole_Darksun.R";

public static int getFileHandle(String fileName, String path) {
    String fullPath = RES_PATH + '$' + path;
    if (subClass == null) {
        Class<headwayEnt.Blackhole_Darksun.R> c = null;     
        try {
            c = (Class<R>)Class.forName(RES_PATH);
        } catch(ClassNotFoundException e) {
            e.printStackTrace();
        } catch(ClassCastException e) {
            e.printStackTrace();
        }
        subClass = c.getDeclaredClasses();
    }
    int fileHandle = 0;
    try {
        int i = 0;
        System.out.println("fullPath: " + fullPath + " subclass len: " +
                subClass.length);
        for (; i < subClass.length; ++i) {
            String name = subClass[i].getName();
            if (subClass[i].getName().equals(fullPath)) {
                break;
            }
        }
        System.out.println("found i: " + i);
        Field[] f = subClass[i].getDeclaredFields();
        for (i = 0; i < f.length; ++i) {
            if (f[i].getName().equals(fileName)) {
                break;
            }
        }

        try {
            fileHandle = f[i].getInt(null);
        } catch(IllegalAccessException e) {

        }
    } catch (RuntimeException e) {
        System.out.println("Could not find filename: " + fileName + 
                " with path: " + path);
        throw e;
    }
    return fileHandle;
}

例如,路径原始和文件名从那里我得到一个ArrayIndexOutOfBoundsException行

Field[] f = subClass[i].getDeclaredFields();

因为subClass.length是0.

如果没有混淆,这个东西工作正常,所以我认为问题在于proguard.

我尝试用不同的方法来使它不像这样混淆R类:

-keep public class headwayEnt.HotshotEngine.Resource.ENG_Resource { *; }
-keep class headwayEnt.HotshotEngine.** { *; }
-keep class **.R$*
-keep public class headwayEnt.Blackhole_Darksun.R { *; }
-keep public class headwayEnt.Blackhole_Darksun_Full.R { *; }
-repackageclasses ''
-keep public class **.R {
  public *;
}
-keep public class **.R$* {
  public *;
}

仍然无法正常工作.

我必须提到我的所有代码都在一个库(headwayEnt.Blackhole_Darksun)中,并且我在headwayEnt.Blackhole_Darksun_Full中引用该库.基本上我从相同的代码构建两个版本,一个用于完整版,一个用于免费演示.所有这些混淆都发生在应用程序中,而不是在引用的库中(只是为了清楚).

Answer 1

这应该工作:

-keepattributes InnerClasses

-keep class **.R
-keep class **.R$* {
    <fields>;
}

该InnerClasses属性是获取任何内容所必需的Class$getDeclaredClasses().-keep选项是保持相关类和字段及其原始名称所必需的.