为什么Android Studio Proguard mapping.txt文件为空（0 KB）？

Question

在上周，对于我的所有Android Studio项目，Proguard mapping.txt文件突然被创建为一个空文件（0 KB）。每次我创建一个构建文件时，都会正确生成该文件。每次创建构建文件时，都会生成以下文件：

seeds.txt
resources.txt
usage.txt
mapping.txt

每次创建构建时，都会正确生成除mapping.txt之外的所有文件。映射文件也已生成，但其中没有文本。

defaultConfig {
        applicationId "com.xxxxxxxx.xxxxxxxxxxxxx"
        minSdkVersion 19
        targetSdkVersion 26
        versionCode xxx
        versionName "x.xx.x.xxx"
        multiDexEnabled true
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        debug {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.config
            debuggable false
        }
    }

Android Studio中是否存在可能被无意间切换的设置，并且正在阻止正确生成mapping.txt文件？我已经为此工作了3天，甚至创建了几个新项目，这些项目也创建了一个空的映射文件。

非常感谢您能给我的帮助。如果您需要其他信息，请告诉我。预先谢谢你。

这是我的ProGuard-rules.pro文件：

-ignorewarnings
-keep class * {
    public private *;
}

-keep class android.support.v7.widget.ShareActionProvider { *; }

-dontwarn retrofit2.Platform$Java8
-dontwarn retrofit.Platform$Java8

-dontwarn okio.**
-keep class com.google.android.gms.** { *; }
-keepclassmembers class * implements android.os.Parcelable {
   static ** CREATOR;
}
-keepclassmembers class * implements com.google.android.gms.common.internal.ReflectedParcelable {
   static ** CREATOR;
}

-keep class com.fasterxml.jackson.databind.ObjectMapper {
    public <methods>;
    protected <methods>;
}
-keep class com.fasterxml.jackson.databind.ObjectWriter {
    public ** writeValueAsString(**);
}
-keepnames class com.fasterxml.jackson.** { *; }
-dontwarn com.fasterxml.jackson.databind.**
-dontwarn com.fasterxml.jackson.core.**
-dontwarn com.fasterxml.jackson.annotation.**

#MobFox Integration
-keep class com.mobfox.** { *; }
-keep class com.mobfox.adapter.** {*;}
-keep class com.mobfox.sdk.** {*;}

#Ad Colony Integration
-keepclassmembers class com.adcolony.sdk.ADCNative** {
    *;
}

# MoPub Integration
# Keep public classes and methods.
-keepclassmembers class com.mopub.** { public *; }
-keep public class com.mopub.**
-keep public class android.webkit.JavascriptInterface {}

# Explicitly keep any custom event classes in any package.
-keep class * extends com.mopub.mobileads.CustomEventBanner {}
-keep class * extends com.mopub.mobileads.CustomEventInterstitial {}
-keep class * extends com.mopub.nativeads.CustomEventNative {}
-keep class * extends com.mopub.nativeads.CustomEventRewardedAd {}

# Keep methods that are accessed via reflection
-keepclassmembers class ** { @com.mopub.common.util.ReflectionTarget *; }
-keepclassmembers class com.mopub.mobileads.CustomEventBannerAdapter {!private !public !protected *;}

# Viewability support
-keepclassmembers class com.integralads.avid.library.mopub.** { public *; }
-keep public class com.integralads.avid.library.mopub.**
-keepclassmembers class com.moat.analytics.mobile.mpub.** { public *; }
-keep public class com.moat.analytics.mobile.mpub.**

# Support for Android Advertiser ID.
-keep class com.google.android.gms.common.GooglePlayServicesUtil {*;}
-keep class com.google.android.gms.ads.identifier.AdvertisingIdClient {*;}
-keep class com.google.android.gms.ads.identifier.AdvertisingIdClient$Info {*;}

# Support for Google Play Services
# http://developer.android.com/google/play-services/setup.html
-keep class * extends java.util.ListResourceBundle {
    protected Object[][] getContents();
}

-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
    public static final *** NULL;
}

-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
    @com.google.android.gms.common.annotation.KeepName *;
}

-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}

# Support for GlideApp
-keep public class * implements com.bumptech.glide.module.GlideModule
-keep public class * extends com.bumptech.glide.AppGlideModule
-keep public enum com.bumptech.glide.load.resource.bitmap.ImageHeaderParser$** {
  **[] $VALUES;
  public *;
}
-dontwarn com.bumptech.glide.load.engine.bitmap_recycle.LruBitmapPool
-dontwarn com.bumptech.glide.load.resource.bitmap.Downsampler
-dontwarn com.bumptech.glide.load.resource.bitmap.HardwareConfigState

# Suppot for AerServ

# AerServ SDK
-keep class com.aerserv.** { *; }
-keepclassmembers class com.aerserv.** { *; }

# Moat
-keep class com.moat.** {*;}
-dontwarn com.moat.**

# For Adcolony
-dontwarn android.webkit.**
-dontwarn com.adcolony.**
-keep class com.adcolony.sdk.* { *; }

# For Admob
-keep class com.google.android.gms.ads.** { *; }

# For Applovin
-dontwarn com.applovin.**
-keep class com.applovin.** { *; }

# For AppNext
-keep class com.appnext.** { *; }
-dontwarn com.appnext.**

# For Chartboost
-dontwarn com.chartboost.sdk.**
-keep class com.chartboost.sdk.** { *; }

# For Facebook
-dontwarn com.facebook.ads.**
-keep class com.facebook.ads.** { *; }

# For Millennial Media
-dontwarn com.millennialmedia.**
-keep class com.millennialmedia.** { *; }

# For Mopub
-dontwarn com.mopub.**
-keep class com.mopub.** { *; }

# For myTarget
-dontwarn com.my.target.ads.**
-keep class com.my.target.ads.** { *; }

# For RhythmOne
-dontwarn com.rhythmone.ad.sdk.**
-keep class com.rhythmone.ad.sdk.** { *; }

# For Tremor
-dontwarn com.tremorvideo.sdk.**
-keep class com.tremorvideo.sdk.android.videoad.** { *; }

# For Unity Ads
-dontwarn com.unity3d.ads.**
-keep class com.unity3d.ads.** { *; }

# For Vungle
-dontwarn com.vungle.publisher.**
-keep class com.vungle.publisher.** { *; }

# For Flurry by Yahoo
-dontwarn android.support.customtabs.**
-dontwarn com.flurry.android.**
-dontwarn com.inmobi.**
-keep class com.flurry.** { *; }

# For InMobi by Yahoo
-keepattributes SourceFile,LineNumberTable
-keep class com.inmobi.** { *; }
-keep public class com.google.android.gms.**
-dontwarn com.google.android.gms.**
-dontwarn com.squareup.picasso.**
-keep class com.google.android.gms.ads.identifier.AdvertisingIdClient{
     public *;
}
-keep class com.google.android.gms.ads.identifier.AdvertisingIdClient$Info{
     public *;
}
# skip the Picasso library classes
-keep class com.squareup.picasso.** {*;}
-dontwarn com.squareup.picasso.**
-dontwarn com.squareup.okhttp.**

# Google Android Classes
-keep public class com.google.android.gms.* { public *; }
-dontwarn com.google.android.gms.**

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

-keep public class com.google.android.gms.common.internal.safeparcel.SafeParcelable {
    public static final *** NULL;
}

-keepnames @com.google.android.gms.common.annotation.KeepName class *
-keepclassmembernames class * {
    @com.google.android.gms.common.annotation.KeepName *;
}

-keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
}

# Mapbox
-dontwarn com.mapbox.mapboxsdk.plugins.locationlayer.**
-dontwarn okhttp3.internal.platform.ConscryptPlatform.**

Answer 1

这是由于第3方库阻止了映射文件的正确生成。我已经联系图书馆创建者，并且已经修复。