Android中的Proguard和反射

Question

我刚刚使用了proguard，但是我试图通过反射实例化的类不起作用。

我有一个界面

Algorithm

我通过这样的课程

AlgorithmFactory.SomeClassThatExtendsAlgorithmImpl.class

该类实例化如下

public ArrayList<Algorithm> getAlgorithms(Context cnx) {
ArrayList<Algorithm> list = new ArrayList<Algorithm>();

for(Class<? extends Algorithm> alg: algorithms) {

    try {
        Constructor<? extends Algorithm> c = alg.getConstructor(Context.class);
        list.add(c.newInstance(cnx));
    } catch (IllegalArgumentException e) {
        Log.e(TAG, "IllegalArgumentException", e);
        throw new IllegalStateException("There was a problem creating the Algorithm class");
    } catch (InvocationTargetException e) {
        Log.e(TAG, "InvocationTargetException", e);
        throw new IllegalStateException("There was a problem creating the Algorithm class");
    } catch (InstantiationException e) {
        Log.e(TAG, "InstantiationException", e);
        throw new IllegalStateException("There was a problem creating the Algorithm class");
    } catch (IllegalAccessException e) {
        Log.e(TAG, "IllegalAccessException", e);
        throw new IllegalStateException("There was a problem creating the Algorithm class");
    } catch (SecurityException e) {
        Log.e(TAG, "SecurityException", e);
        throw new IllegalStateException("There was a problem creating the Algorithm class");
    } catch (NoSuchMethodException e) {
        Log.e(TAG, "NoSuchMethodException", e);
        throw new IllegalStateException("There was a problem creating the Algorithm class");
    }
}
return list;
}

这是我的proguard.cnf

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-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.android.vending.licensing.ILicensingService


-keepclasseswithmembernames class * {
    native <methods>;
}

-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}

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

-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

-assumenosideeffects class android.util.Log {
    public static *** d(...);
    public static *** v(...);
    public static *** i(...);
    public static *** w(...);
    public static *** e(...);
}

Answer 1

解决了

对于遇到此问题的其他人，您需要将以下内容添加到proguard.cnf

-keep public class * extends com.yoursite.android.yourappname.YourClassName

-keepclassmembers class * extends com.yoursite.android.yourappname.YourClassName{
 public <init>(android.content.Context);
}

第一个keep告诉proguard不要混淆扩展YourClassName的类名

第二个说保持构造函数名称（ <init>表示构造函数）未混淆，它具有Context的单个参数并扩展YourClassName

此外，对于在XML布局文件中使用onClick属性的 android开发人员，您还需要在proguard.cnf文件中添加该函数的名称。

-keepclassmembers class * {
 public void myClickHandler(android.view.View);
}

这表示在所有类中使用单个参数View保留名为myClickHandler所有方法。 您可以通过使用上面的extends关键字进一步限制这一点。

希望这可以帮助。

Answer 2

对于on click fix，您不必列出每个方法名称。 你可以做：

-keepclassmembers class * {
   public void *(android.view.View);
}

查找具有View作为参数的所有方法。

Answer 3

因为编译过程将删除未使用的方法，所以即使在编译过程中使用反射来调用构造函数方法也将被删除。

您可以在项目的usage.txt中看到编译过程中删除的方法。

所以你应该把构造函数方法保存在proguard文件中。

-keepclassmembers class * extends com.yoursite.android.yourappname.YourClassName{
 public <init>(android.content.Context);
}