与Proguard

时间：2017-01-26 15:55:10

标签： android android-fragments exception proguard obfuscation

我有一个Android应用程序，其调试版本完美运行。然而，它的发布版本（包括使用ProGuard进行模糊处理（配置如下所示））不起作用，并且始终在以下日志中崩溃：

01-26 15:33:34.048 E/AndroidRuntime: FATAL EXCEPTION: main
                                 Process: com.alxdroiddev.cameragear, PID: 6551
                                 co: Fragment FragmentIntro{13af572c id=0x7f100177 android:switcher:2131755383:0} did not call through to super.onAttach()
                                     at android.support.v4.app.FragmentManagerImpl.a(SourceFile:1232)
                                     at android.support.v4.app.FragmentManagerImpl.v(SourceFile:2323)
                                     at android.support.v4.app.FragmentManagerImpl.a(SourceFile:2136)
                                     at android.support.v4.app.FragmentManagerImpl.b(SourceFile:2092)
                                     at android.support.v4.app.FragmentManagerImpl.b(SourceFile:1969)
                                     at bu.commitNowAllowingStateLoss(SourceFile:620)
                                     at android.support.v4.app.FragmentPagerAdapter.finishUpdate(SourceFile:143)
                                     at android.support.v4.view.ViewPager.populate(SourceFile:1268)
                                     at android.support.v4.view.ViewPager.populate(SourceFile:1116)
                                     at android.support.v4.view.ViewPager.onMeasure(SourceFile:1642)
                                     at android.view.View.measure(View.java:17430)
                                     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727)
                                     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463)
                                     at android.view.View.measure(View.java:17430)
                                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
                                     at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
                                     at android.support.v7.widget.ContentFrameLayout.onMeasure(SourceFile:139)
                                     at android.view.View.measure(View.java:17430)
                                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
                                     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
                                     at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
                                     at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
                                     at android.view.View.measure(View.java:17430)
                                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
                                     at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
                                     at android.view.View.measure(View.java:17430)
                                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
                                     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
                                     at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
                                     at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
                                     at android.view.View.measure(View.java:17430)
                                     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
                                     at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
                                     at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560)
                                     at android.view.View.measure(View.java:17430)
                                     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001)
                                     at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166)
                                     at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372)
                                     at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
                                     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
                                     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
                                     at android.view.Choreographer.doCallbacks(Choreographer.java:580)
                                     at android.view.Choreographer.doFrame(Choreographer.java:550)
                                     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
                                     at android.os.Handler.handleCallback(Handler.java:739)
                                     at android.os.Handler.dispatchMessage(Handler.java:95)
                                     at android.os.Looper.loop(Looper.java:135)
                                     at android.app.ActivityThread.main(ActivityThread.java:5221)
                                     at java.lang.reflect.Method.invoke(Native Method)
                                     at java.lang.reflect.Method.invoke(Method.java:372)
                                     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
                                     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

我尝试添加所需的调用（在错误的片段中覆盖onAttach()），但这没有任何区别。有问题的片段位于下面的代码中，它与库AppIntro一起使用。这是FragmentIntro.java的代码：


    public class FragmentIntro extends Fragment implements ISlideBackgroundColorHolder {

        /*    Static stuff     */
        private static final String ARG_LAYOUT_TITLE_ID = "titleId";
        private static final String ARG_LAYOUT_MESSAGE_ID = "messageId";
        private static final String ARG_LAYOUT_DRAWABLE_ID = "drawableId";
        private static final String ARG_LAYOUT_COLOR_ID = "colorId";
        //private static final int layoutResId = R.layout.intro_fragment;

        /*    Private instance variables     */
        private int titleRedId, messageResId, drawableId, colorResId, colorCode;
        private RelativeLayout mainLayout;

        public static FragmentIntro newInstance(@StringRes  int titleId, @StringRes int messageId, @DrawableRes int drawableId, @ColorRes int colorId) {

            FragmentIntro fragSlide = new FragmentIntro();

            Bundle args = new Bundle();
            args.putInt(ARG_LAYOUT_TITLE_ID, titleId);
            args.putInt(ARG_LAYOUT_MESSAGE_ID , messageId);
            args.putInt(ARG_LAYOUT_DRAWABLE_ID , drawableId );
            args.putInt(ARG_LAYOUT_COLOR_ID, colorId );

            fragSlide.setArguments(args);

            return fragSlide;
        }

        @Override
        public void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            if (getArguments() != null) {
                this.titleRedId = getArguments().getInt(ARG_LAYOUT_TITLE_ID);
                this.messageResId = getArguments().getInt(ARG_LAYOUT_MESSAGE_ID);
                this.drawableId = getArguments().getInt(ARG_LAYOUT_DRAWABLE_ID);
                this.colorResId = getArguments().getInt(ARG_LAYOUT_COLOR_ID);
            }
        }

        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            //super.onCreateView(inflater, container, savedInstanceState);
            //if (container == null) return null;

            View view = inflater.inflate(R.layout.intro_fragment, container, false);

            Utils.globalAppContext = getContext().getApplicationContext();

            colorCode = ContextCompat.getColor(getContext().getApplicationContext(), colorResId);

            mainLayout = (RelativeLayout) view.findViewById(R.id.introLayout);
            mainLayout.setBackgroundColor(colorCode);
            ((TextView) view.findViewById(R.id.textViewIntroTitle)).setText(titleRedId);
            ((TextView) view.findViewById(R.id.textViewIntroMessage)).setText(messageResId);
            ((ImageView) view.findViewById(R.id.imageViewIntro)).setImageDrawable(Utils.getDrawableFromResource(drawableId));

            return view;
        }

        @Override
        public void onSaveInstanceState(Bundle outState) {
            outState.putInt(ARG_LAYOUT_TITLE_ID, titleRedId);
            outState.putInt(ARG_LAYOUT_MESSAGE_ID, messageResId);
            outState.putInt(ARG_LAYOUT_DRAWABLE_ID, drawableId);
            outState.putInt(ARG_LAYOUT_COLOR_ID, colorResId);
            super.onSaveInstanceState(outState);
        }

        @Keep
        @TargetApi(23)
        @Override
        public void onAttach(Context context) {
            super.onAttach(context);
        }

        @Keep
        @SuppressWarnings("deprecation")
        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
        }

        @Override
        public void onPause() {
            super.onPause();
        }

        @Override
        public void onResume() {
            super.onResume();
        }

        @Override
        public void onStart() {
            super.onStart();
        }

        @Override
        public void onStop() {
            super.onStop();
        }


        // Implementation of ISlideBackgroundColorHolder

        @Override
        public int getDefaultBackgroundColor() {
            return colorCode;
        }

        @Override
        public void setBackgroundColor(@ColorInt int backgroundColor) {
            mainLayout.setBackgroundColor(backgroundColor);
        }
    }

我正在使用的proguard配置文件就是这个（只有这个）：


    ####################################################################  GENERAL OPTIONS

    -optimizationpasses 5
    -dontusemixedcaseclassnames
    -dontskipnonpubliclibraryclasses
    -dontskipnonpubliclibraryclassmembers
    -verbose
    -dontpreverify
    -repackageclasses ''
    -allowaccessmodification
    -mergeinterfacesaggressively
    -overloadaggressively
    -keepattributes *Annotation*,Signature,EnclosingMethod,InnerClasses


    -assumenosideeffects class com.alxdroiddev.cameragear.FragmentQueryRunner { *; }
    -assumenosideeffects class com.alxdroiddev.cameragear.FragmentCards { *; }
    -assumenosideeffects class com.alxdroiddev.cameragear.db.InitialSampleData { *; }

    # Required for Firebase Database (Models and POJOs)
    -keepclassmembers class com.alxdroiddev.cameragear.models.** {
      *;
    }


    ####################################################################  REMOVE LOGGING

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

    -assumenosideeffects class com.alxdroiddev.utils.CLog { *; }


    ####################################################################  IMAGECROPPER

    -keepnames class com.theartofdev.edmodo.cropper.** { *; }

    ####################################################################  APPINTRO

    -keep class com.github.paolorotolo.** {*;}
    -keep public class com.alxdroiddev.cameragear.utils.FragmentIntro
    -keepclassmembers public class com.alxdroiddev.cameragear.utils.FragmentIntro {*;}
    -keep public class com.alxdroiddev.cameragear.ActivityIntro
    -keepclassmembers public class com.alxdroiddev.cameragear.ActivityIntro {*;}

    ####################################################################  METADATA-EXTRACTOR

    -keep class com.drew.imaging.** { *; }
    -keep class com.drew.metadata.** { *; }
    -keep class com.drew.lang.** { *; }

    ####################################################################  MISC STUFF


    -keep class * extends java.util.ListResourceBundle {
        protected java.lang.Object[][] getContents();
    }

    # Needed for Parcelable/SafeParcelable Creators to not get stripped
    -keepnames class * implements android.os.Parcelable {
        public static final ** CREATOR;
    }

    -keepclassmembers class * implements android.os.Parcelable {
        static ** CREATOR;
    }

    # Needed when building against pre-Marshmallow SDK.
    -dontwarn android.security.NetworkSecurityPolicy


    -keep class android.support.customtabs.** { *; }
    -dontwarn android.support.customtabs.** 

    -keep class com.google.android.gms.** { *; }
    -dontwarn com.google.android.gms.**

    #################################################################### IN-APP BILLING

    -keep public interface com.android.vending.licensing.ILicensingService
    -keep public class com.google.vending.licensing.ILicensingService
    -keep public class com.android.vending.licensing.ILicensingService

    ####################################################################  KEEP ANDROID SUPPORT V7 AND DESIGN

    -dontwarn android.support.design.**
    -keep class android.support.design.** { *; }
    -keep interface android.support.design.** { *; }
    -keep public class android.support.design.R$** { *; }

    -keep public class android.support.v7.widget.** { *; }
    -keep public class android.support.v7.internal.widget.** { *; }
    -keep public class android.support.v7.internal.view.menu.** { *; }

    -keep public class * extends android.support.v4.view.ActionProvider {
        public (android.content.Context);
    }

    -keep public class android.support.v14.preference.** { *; }
    -keep public class android.support.v7.app.** { *; }
    -keep public class android.support.v7.preference.** { *; }
    -keep public class android.support.v4.app.** { *; }



    -dontwarn android.support.**
    -keep interface android.support.v4.** { *; }
    -keep interface android.support.v7.** { *; }
    -keep interface android.support.v13.** {*; }
    -keep interface android.support.v14.** {*; }

    ####################################################################  ORG.APACHE.HTTP

    -keep class org.apache.http.** { *; }
    -keep interface org.apache.http.**
    -dontwarn org.apache.**

    ####################################################################  GOOGLE PLAY SERVICES LIB - ADS

    -keep public class com.google.android.gms.** { public *; }
    #-keep class com.google.android.gms.**

    # For Google Play Services
    -keep public class com.google.android.gms.ads.**{
       public *;
    }

    ####################################################################  FIREBASE

    -keep public class com.google.firebase.** { *; }
    -keep public class com.google.firebase.analytics.** { *; }
    -keep public class com.google.firebase.provider.** { *; }
    -keep public class com.google.firebase.auth.** { *; }
    -keep interface com.google.firebase.** {*; }
    -keep class com.firebase.** { *; }


    #################################################################### SUGGESTED OPTIMIZATIONS BY GOOGLE


    # For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
    -keepclasseswithmembernames class * {
        native ;
    }

    # keep setters in Views so that animations can still work.
    # see http://proguard.sourceforge.net/manual/examples.html#beans
    -keepclassmembers public class * extends android.view.View {
       void set*(***);
       *** get*();
    }

    # We want to keep methods in Activity that could be used in the XML attribute onClick
    -keepclassmembers class * extends android.app.Activity {
       public void *(android.view.View);
    }

    # For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
    -keepclassmembers enum * {
        public static **[] values();
        public static ** valueOf(java.lang.String);
    }

    -keepclassmembers class **.R$* {
        public static ;
    }

    # Understand the @Keep support annotation.
    -keep class android.support.annotation.Keep

    -keep @android.support.annotation.Keep class * {*;}

    -keepclasseswithmembers class * {
        @android.support.annotation.Keep ;
    }

    -keepclasseswithmembers class * {
        @android.support.annotation.Keep ;
    }

    -keepclasseswithmembers class * {
        @android.support.annotation.Keep (...);
    }

我已经忘记了我花了多少时间试图解决这个问题，特别是因为所有内容都在调试模式下运行，并且没有对super.onAttach()的抱怨。只有在使用上面的配置进行模糊处理后它才会失败。

非常感谢您的关注，感谢任何帮助。

最好的问候。

3 个答案:

答案 0 :(得分：1)

正如您在调试中所做的那样，问题可能只与模糊处理有关，而与实际代码无关。

您是否尝试将整个课程保留在proguard中：

-keep class com.alxdroiddev.cameragear.utils.FragmentIntro { *; }

答案 1 :(得分：1)

您是否尝试过删除这些行：

@Keep
@TargetApi(23)
@Override
public void onAttach(Context context) {
    super.onAttach(context);
}

@Keep
@SuppressWarnings("deprecation")
@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
}

答案 2 :(得分：1)

我得到了它的工作。就像Doron所说的那样，它可能与混淆有关，而与代码本身无关。

我将在这里发布我的方法和最终的proguard.cfg文件，只是为了面对同样问题的人们以及如何[可能]解决它的参考（注意：它涉及大量的肘部油脂！ ）。

因为我还怀疑它与类或代码无关，所以我做的第一件事就是删除所有不必要的覆盖，让两个类都被混淆并禁用所有优化。这是通过我的ProGuard配置中的这些设置完成的：

-optimizations no_optimizations

说明：no_optimizations只是一个空的占位符。它对ProGuard没有任何意义。你可以很好地使用＆＃34;黄瓜＆＃34;在那里它会产生同样的效果。这只意味着不会运行任何选择。它与不指定-optimizations指令不同，这意味着将运行所有优化。

我还评论了-keep类和FragmentIntro的所有ActivityIntro。我做了一个发布编译和测试。它优雅地跑了！上面文件中显示的所有其他混淆选项（在OP中）都已打开并保持不变。

然后肘部油脂开始了：我创建了一条线，每一个ProGuard优化都被明确否定：

-optimizations !class/marking/final,!class/unboxing/enum,!class/merging/vertical,!class/merging/horizontal,!field/removal/writeonly,!field/marking/private,!field/propagation/value,!method/marking/private,!method/marking/static,!method/marking/final,!method/removal/parameter,!method/propagation/parameter,!method/propagation/returnvalue,!method/inlining/short,!method/inlining/unique,!method/inlining/tailrecursion,!code/merging,!code/simplification/variable,!code/simplification/arithmetic,!code/simplification/cast,!code/simplification/field,!code/simplification/branch,!code/simplification/string,!code/simplification/advanced,!code/removal/advanced,!code/removal/simple,!code/removal/variable,!code/removal/exception,!code/allocation/variable

然后我开始允许一次进行1次优化，每次我进行发布版本，安装在模拟器上，看看应用程序是否运行。

如果该优化导致正在运行的应用程序，我将其留下没有感叹号（！），这意味着它将被允许，否则我将感叹号放回并继续进行下一个优化：删除标记，发布构建，安装，测试。

我做了29次，每次优化一次，只是为了弄清楚哪些优化使我的代码崩溃。

最后，我得到了所有不需要的优化，并得到了这个：

-optimizations class/marking/final,class/unboxing/enum,class/merging/vertical,class/merging/horizontal,!field/removal/writeonly,field/marking/private,field/propagation/value,method/marking/private,!method/marking/static,method/marking/final,!method/removal/parameter,method/propagation/parameter,method/propagation/returnvalue,method/inlining/short,method/inlining/unique,method/inlining/tailrecursion,code/merging,code/simplification/variable,code/simplification/arithmetic,code/simplification/cast,code/simplification/field,code/simplification/branch,code/simplification/string,code/simplification/advanced,!code/removal/advanced,code/removal/simple,code/removal/variable,code/removal/exception,!code/allocation/variable

上面一行，清理并且仅拒绝（感叹号）不需要的选择，相当于：

-optimizations !field/removal/writeonly,!method/marking/static,!method/removal/parameter,!code/removal/advanced,!code/allocation/variable

上面的优化没有完成，我的代码编译并运行正常。另一方面，如果我允许上面的任何优化，它将在启动时崩溃。

这是我清理后的工作proguard.cfg文件的结果：

####################################################################  GENERAL OPTIONS

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-verbose
-dontpreverify
-repackageclasses ''
-allowaccessmodification
-mergeinterfacesaggressively
-overloadaggressively
-keepattributes *Annotation*,Signature,EnclosingMethod,InnerClasses


-optimizations !field/removal/writeonly,!method/marking/static,!method/removal/parameter,!code/removal/advanced,!code/allocation/variable


-assumenosideeffects class com.alxdroiddev.cameragear.FragmentQueryRunner { *; }
-assumenosideeffects class com.alxdroiddev.cameragear.FragmentCards { *; }
-assumenosideeffects class com.alxdroiddev.cameragear.db.InitialSampleData { *; }

# Required for Firebase Database (Models and POJOs)
-keepclassmembers class com.alxdroiddev.cameragear.models.** {
  *;
}


####################################################################  REMOVE LOGGING

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

-assumenosideeffects class com.alxdroiddev.utils.CLog { *; }


####################################################################  IMAGECROPPER

-keepnames class com.theartofdev.edmodo.cropper.** { *; }

####################################################################  APPINTRO

-keep class com.github.paolorotolo.** {*;}

####################################################################  METADATA-EXTRACTOR

-keep class com.drew.imaging.** { *; }
-keep class com.drew.metadata.** { *; }
-keep class com.drew.lang.** { *; }

####################################################################  MISC STUFF


-keep class * extends java.util.ListResourceBundle {
    protected java.lang.Object[][] getContents();
}

# Needed for Parcelable/SafeParcelable Creators to not get stripped
-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}

-keepclassmembers class * implements android.os.Parcelable {
    static ** CREATOR;
}

# Needed when building against pre-Marshmallow SDK.
-dontwarn android.security.NetworkSecurityPolicy


-keep class android.support.customtabs.** { *; }
-dontwarn android.support.customtabs.** 

-keep class com.google.android.gms.** { *; }
-dontwarn com.google.android.gms.**

#################################################################### IN-APP BILLING

-keep public interface com.android.vending.licensing.ILicensingService
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService

####################################################################  KEEP ANDROID SUPPORT V7 AND DESIGN

-dontwarn android.support.design.**
-keep class android.support.design.** { *; }
-keep interface android.support.design.** { *; }
-keep public class android.support.design.R$** { *; }

-keep public class android.support.v7.widget.** { *; }
-keep public class android.support.v7.internal.widget.** { *; }
-keep public class android.support.v7.internal.view.menu.** { *; }

-keep public class * extends android.support.v4.view.ActionProvider {
    public <init>(android.content.Context);
}

-keep public class android.support.v14.preference.** { *; }
-keep public class android.support.v7.app.** { *; }
-keep public class android.support.v7.preference.** { *; }
-keep public class android.support.v4.app.** { *; }



-dontwarn android.support.**
-keep interface android.support.v4.** { *; }
-keep interface android.support.v7.** { *; }
-keep interface android.support.v13.** {*; }
-keep interface android.support.v14.** {*; }

####################################################################  ORG.APACHE.HTTP

-keep class org.apache.http.** { *; }
-keep interface org.apache.http.**
-dontwarn org.apache.**

####################################################################  GOOGLE PLAY SERVICES LIB - ADS

-keep public class com.google.android.gms.** { public *; }

# For Google Play Services
-keep public class com.google.android.gms.ads.**{
   public *;
}

####################################################################  FIREBASE

-keep public class com.google.firebase.** { *; }
-keep public class com.google.firebase.analytics.** { *; }
-keep public class com.google.firebase.provider.** { *; }
-keep public class com.google.firebase.auth.** { *; }
-keep interface com.google.firebase.** {*; }
-keep class com.firebase.** { *; }


#################################################################### SUGGESTED OPTIMIZATIONS BY GOOGLE


# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
-keepclasseswithmembernames class * {
    native <methods>;
}

# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
-keepclassmembers public class * extends android.view.View {
   void set*(***);
   *** get*();
}

# We want to keep methods in Activity that could be used in the XML attribute onClick
-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

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

# Understand the @Keep support annotation.
-keep class android.support.annotation.Keep

-keep @android.support.annotation.Keep class * {*;}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep <methods>;
}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep <fields>;
}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep <init>(...);
}

我没有明确的想法为什么提到的标记优化会破坏我的代码，尽管我怀疑它在v4.app.Fragment相关类（特别是v4.app.FragmentManager，在第1230行中）中进行了优化它从正确调用onAttach（）并将f.mCalled设置为true）。顺便说一句，我使用的是Android支持库25.1.0。

无论如何，谢谢你的时间和关注，我希望上面解决这个令人讨厌的问题的方法对某人有所帮助。

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