Android 软件包名称 Dex 问题

Question

我正在尝试创建一个包名称为“com.cvs.myapp”的应用程序。应用构建完美，但在运行时在设备中崩溃。

    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.cvs.myapp/com.cvs.myapp.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.cvs.myapp.MainActivity" on path: DexPathList[[zip file "/data/app/com.cvs.myapp-DG6fxWRjVXjsKQV_vwJwAw==/base.apk"],nativeLibraryDirectories=[/data/app/com.cvs.myapp-DG6fxWRjVXjsKQV_vwJwAw==/lib/x86, /system/lib]]
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2843)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.cvs.myapp.MainActivity" on path: DexPathList[[zip file "/data/app/com.cvs.myapp-DG6fxWRjVXjsKQV_vwJwAw==/base.apk"],nativeLibraryDirectories=[/data/app/com.cvs.myapp-DG6fxWRjVXjsKQV_vwJwAw==/lib/x86, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:69)
        at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:41)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1215)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2831)

这只是一个新项目，没有其他添加，仅包含一个 MainActivity 类。如果我将包重命名为“com.demo.myapp”，则相同的新项目将起作用。

使用Analyze APK，我可以看到classes.dex 文件不包含MainActivity。名称“cvs”是否会导致问题，因为它可以与任何其他名称完美配合？

gradle-wrapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip

build.gradle(项目)

classpath 'com.android.tools.build:gradle:3.6.3'

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cvs.myapp">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name="com.cvs.myapp.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Answer 1

正如您所提到的，当您使用当前为 3.6.3 的最新 Gradle 时会发生这种情况，它有一个新的打包工具 ZipFlinger，这可能是导致问题的原因，请尝试以下代码来禁用它

android.useNewApkCreator=false

另外我有一些相关的链接，请看一下。

https://issuetracker.google.com/issues/150198184

After upgrading to android 3.6.1 apk cant be installed on devices

Android App runtime crash after update gradle plugin 3.6

MultiDex problem with Android Studio 3.6 when implementing it the right way