Custom AppComponentFactory无法实例化应用程序

Posted 2023-01-15

我正在尝试使用非零arg构造函数（基于Dagger的构造函数依赖注入）来实现自定义AppComponentFactory以创建我的Application和Activity实例，但是我的应用无法启动，因为我的自定义Application子类型没有零arg构造函数，并且堆栈跟踪表明未使用我的自定义AppComponentFactory。

E/androidRuntime: FATAL EXCEPTION: main
    Process: com.domain.app, PID: 32670
    java.lang.RuntimeException: Unable to instantiate application com.domain.app.CustomApplication: java.lang.InstantiationException: java.lang.Class<com.domain.app.CustomApplication> has no zero argument constructor
        at android.app.LoadedApk.makeApplication(LoadedApk.java:1226)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6431)
        at android.app.ActivityThread.access$1300(ActivityThread.java:219)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1859)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
     Caused by: java.lang.InstantiationException: java.lang.Class<com.domain.app.CustomApplication> has no zero argument constructor
        at java.lang.Class.newInstance(Native Method)
        at android.app.AppComponentFactory.instantiateApplication(AppComponentFactory.java:76)
        at android.app.Instrumentation.newApplication(Instrumentation.java:1155)
        at android.app.LoadedApk.makeApplication(LoadedApk.java:1218)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6431) 
        at android.app.ActivityThread.access$1300(ActivityThread.java:219) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1859) 
        at android.os.Handler.dispatchMessage(Handler.java:107) 
        at android.os.Looper.loop(Looper.java:214) 
        at android.app.ActivityThread.main(ActivityThread.java:7356) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930) 

UPDATE：进一步检查后，Logcat中出现另一个错误，表明系统无法找到我的自定义AppComponentFactory。

E/LoadedApk: Unable to instantiate appComponentFactory
    java.lang.ClassNotFoundException: Didn't find class "com.domain.app.appname.CustomAppComponentFactory" on path: DexPathList[[zip file "/data/app/com.domain.app.appname-8VLkpKFTUtW8k-xEHX-oMQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.domain.app.appname-8VLkpKFTUtW8k-xEHX-oMQ==/lib/arm64, /system/lib64, /system/product/lib64]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.LoadedApk.createAppFactory(LoadedApk.java:256)
        at android.app.LoadedApk.createOrUpdateClassLoaderLocked(LoadedApk.java:855)
        at android.app.LoadedApk.getClassLoader(LoadedApk.java:950)
        at android.app.LoadedApk.getResources(LoadedApk.java:1188)
        at android.app.ContextImpl.createAppContext(ContextImpl.java:2462)
        at android.app.ContextImpl.createAppContext(ContextImpl.java:2454)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6343)
        at android.app.ActivityThread.access$1300(ActivityThread.java:219)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1859)
        at android.os.Handler.dispatchMessage(Handler.java:107)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

答案

在我的情况下，这是由于清单中未使用完全限定的类名引起的。看来，当对.ClassName属性使用简写android:appComponentFactory语法时，系统会预先加上applicationId而不是清单元素中声明的包。为了使系统识别我的CustomAppComponentFactory，我必须从此更改清单：

<application
    android:appComponentFactory=".CustomAppComponentFactory"
    ....
    >

对此：

<application
    android:appComponentFactory="com.domain.app.CustomAppComponentFactory"
    ....
    >

[请注意，我还必须在清单中的tools:replace="appComponentFactory"元素上添加application才能完成所有这些工作，但是有一个明确的错误消息，涉及与androidx.core.app.CoreComponentFactory的清单合并错误，建议添加replace属性。