android-已签名的APK中的ClassNotFoundException

如果我在Android设备上安装并运行签名的APK,则会收到此错误.如果仅编译一个应用程序并直接在设备上运行,则不会出现此错误.

似乎丢失的Fragment在项目的代码中,而不是在任何外部库中.

我该如何调查该错误？我试图重新整理,清理项目等.如果在其中创建缺少的类,我能以某种方式在APK中找到吗？

hier是错误消息：

E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity

ComponentInfo{qua.com.bix/qua.com.bix.main.MainActivity}:
android.support.v4.app.q: Unable to instantiate fragment
qua.com.bix.main.MainLoadingFragment:
make sure class name exists, is public, and has an empty constructor that is public at Android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
    ....
    ....
    Caused by: android.support.v4.app.q: Unable to instantiate fragment qua.com.bix.main.MainLoadingFragment: make sure class name exists, is public, and has an empty constructor that is public
    ....
    ....
    Caused by: java.lang.ClassNotFoundException: Didn't find class "qua.com.bix.main.MainLoadingFragment" on path: /data/app/qua.com.bix-1.apk
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:64)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
    at android.support.v4.app.o.a(Unknown Source) 
    at android.support.v4.app.o.a(Unknown Source) 

这是我的build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "qua.com.bix"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
    }
    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/NOTICE'
    }
    dexOptions{
        incremental true
        javaMaxHeapSize "4g"
    }
    useLibrary 'org.apache.http.legacy'
}

dependencies {
    compile 'com.android.support:multidex:1.0.1'
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.quadriq.qlib:qlib@aar'
    compile 'com.google.code.gson:gson:2.4'
    compile 'com.google.guava:guava:18.0'
    compile 'com.google.code.findbugs:jsr305:2.0.2'
    compile 'com.google.android.gms:play-services:8.3.0'
    compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
    compile 'com.koushikdutta.ion:ion:2.+'
    compile 'joda-time:joda-time:2.9.1'
    compile 'com.github.michaelye.easydialog:easydialog:1.1'
}

更新：目前有用的是禁用proguard,还向proguard-rules.pro添加了-dontobfuscate.但是,以这种方式执行此操作是否是一种好习惯？

proguard-rules.pro现在是：

-dontobfuscate
-dontwarn org.apache.lang.**
-dontwarn com.google.common.**
-dontwarn org.joda.**

更新2：佩蒂回答了我的问题.

解决方法:

Proguard混淆了您至关重要的应用程序类别.

将以下行添加到您的proguard配置文件中,以使proguard不会与扩展Activity,Application,BroadcastReceiver,ContentProvider,Preference和&片段(支持和正常).

# Base Android exclusions, required for proper function of various components
-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 * extends android.preference.Preference
-keep public class * extends android.support.v4.app.Fragment
-keep public class * extends android.app.Fragment

(如果您不愿意使用其中一些内容,则可以删除这些行)

然后删除此行

-dontobfuscate

What helped for now, is disabling proguard, also adding -dontobfuscate
to proguard-rules.pro. But is it a good practice to do this in that
way?

仅当您不关心有人在反编译您的应用程序时,这才是最佳实践.所以不行.通常是因为您想在生产/发布版本中尽可能地执行这样的任务.尤其是当您拥有应用内购买(IAP)或处理敏感数据时.

标签：android-gradle,android-studio,android
来源： https://codeday.me/bug/20191027/1945512.html