Android模型视图控制器实现给出错误

【Android模型视图控制器实现给出错误】蹉跎莫遣韶光老，人生唯有读书好。这篇文章主要讲述Android模型视图控制器实现给出错误相关的知识，希望能为你提供帮助。
我有一个项目正在进行中，一切都是正确的，因为我在android studio中使用一个Activity（登录活动）创建项目。后来因为我想在项目上实现MVC，我创建了另外三个包（app，activity）在原始软件包com.otemainc.smartmenu中，然后我将LoginActivity.java文件移动到了活动包中。然后将R类导入其中，将打包的声明行更改为正确的，但当我在手机上运行时，它会给我以下错误

12-16 13:07:27.352 4608-4608/com.otemainc.smartmenu E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.otemainc.smartmenu, PID: 4608 java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.otemainc.smartmenu/com.otemainc.smartmenu.LoginActivity}: java.lang.ClassNotFoundException: Didn't find class "com.otemainc.smartmenu.LoginActivity" on path: DexPathList[[zip file "/data/app/com.otemainc.smartmenu-1/base.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]] at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2426) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595) at android.app.ActivityThread.access$800(ActivityThread.java:178) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5631) 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:959) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754) Caused by: java.lang.ClassNotFoundException: Didn't find class "com.otemainc.smartmenu.LoginActivity" on path: DexPathList[[zip file "/data/app/com.otemainc.smartmenu-1/base.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.otemainc.smartmenu-1/split_lib_slice_9_apk.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:1071) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595) at android.app.ActivityThread.access$800(ActivityThread.java:178) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:194) at android.app.ActivityThread.main(ActivityThread.java:5631) 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:959) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754) Suppressed: java.lang.ClassNotFoundException: com.otemainc.smartmenu.LoginActivity at java.lang.Class.classForName(Native Method) at java.lang.BootClassLoader.findClass(ClassLoader.java:781) at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) at java.lang.ClassLoader.loadClass(ClassLoader.java:504) ... 13 more Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

答案此错误是因为未找到您的活动类，因为您将其移动到另一个文件夹，您需要更改清单文件中的活动名称。你会看起来像这样

< activity android:name=".LoginActivity" android:label="@string/app_name"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity>

这意味着正在原始根包中查找活动文件。您需要将名称变为activity.LoginActivity。代码看起来像这样

< activity android:name=".activity.LoginActivity" android:label="@string/app_name"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity>