Android Studio：如何在模拟器中调试显示错误“Unfortunetly，App has stopped working”的Android应用程序？

Question

当我尝试在Android Studio模拟器中运行我的应用程序时出现以下错误“不幸的是，应用程序已停止工作”。最初，我的Manifest文件中出现了一些问题，其中android：主题未设置为AppCompat，而我的活动路径不正确。然而，解决了那些问题之后，我发现了以下异常在我的logcat：

 --------- beginning of crash 
FATAL EXCEPTION: main 
                      Process: PID: 2437 
                      java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.android.MyApp/main.AuthenticationActivity}: java.lang.ClassNotFoundException: Didn't find class "main.AuthenticationActivity" on path: DexPathList[[zip file "/data/app/com.android.MyApp-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2236) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
                       at android.app.ActivityThread.access$800(ActivityThread.java:151) 
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
                       at android.os.Handler.dispatchMessage(Handler.java:102) 
                       at android.os.Looper.loop(Looper.java:135) 
                       at android.app.ActivityThread.main(ActivityThread.java:5254) 
                       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:903) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
                       Caused by: java.lang.ClassNotFoundException: Didn't find class "main.AuthenticationActivity" on path: DexPathList[[zip file "/data/app/com.android.MyApp-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] 
                       at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
                       at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
                       at java.lang.ClassLoader.loadClass(ClassLoader.java:469) 
                       at android.app.Instrumentation.newActivity(Instrumentation.java:1066) 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2226) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)  
                       at android.app.ActivityThread.access$800(ActivityThread.java:151)  
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)  
                       at android.os.Handler.dispatchMessage(Handler.java:102)  
                       at android.os.Looper.loop(Looper.java:135)  
                       at android.app.ActivityThread.main(ActivityThread.java:5254)  
                       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:903)  
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)  

这是我AndroidManifest文件：

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


    <uses-permission android:name="android.permission.GET_ACCOUNTS"/> 
    <uses-permission android:name="android.permission.READ_PROFILE"/> 
    <uses-permission android:name="android.permission.READ_CONTACTS"/> 
    <uses-permission android:name="android.permission.INTERNET"/> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/Theme.AppCompat"> 
     <activity android:name="main.AuthenticationActivity" 
        android:label="@string/app_name"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN"/> 

       <category android:name="android.intent.category.LAUNCHER"/> 
      </intent-filter> 
     </activity> 
     <activity android:name="main.HomeActivity" 
        android:label="@string/app_name"> 
     </activity> 
    </application> 

</manifest> 

我经历了所有与该网站，并试图岗位去我最好清楚地形成我的问题。我仍然对此感到陌生，所以我愿意接受所有建设性的批评。

从我所了解的情况来看，它无法找到主要活动的文件路径，并且我仔细检查了是否在我的所有文件中输入了正确的文件路径。任何帮助将非常感激。

Answer 1

将您的代码在manifest：“main.AuthenticationActivity”中更改为“.main.AuthenticationActivity”。