android ClassNotFoundException:没有'；找不到类错误

我得到了与java.lang.ClassNotFoundException相同的错误：未找到类，但仅在版本4.4中

我试过各种方法，但都解决不了

有没有办法解决这个问题

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.sinwho.timer/com.sinwho.timer.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.sinwho.timer.MainActivity" on path: DexPathList[[zip file "/data/app/com.sinwho.timer-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.sinwho.timer-1, /vendor/lib, /system/lib]]
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2131)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255)
        at android.app.ActivityThread.access$800(ActivityThread.java:142)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5118)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606)
        at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.sinwho.timer.MainActivity" on path: DexPathList[[zip file "/data/app/com.sinwho.timer-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.sinwho.timer-1, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
        at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2122)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2255) 
        at android.app.ActivityThread.access$800(ActivityThread.java:142) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1203) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:136) 
        at android.app.ActivityThread.main(ActivityThread.java:5118) 
        at java.lang.reflect.Method.invokeNative(Native Method) 
        at java.lang.reflect.Method.invoke(Method.java:515) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:606) 
        at dalvik.system.NativeStart.main(Native Method) 

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在android4.4中，我们面临的问题是：在主DEX文件中声明所需的类。这里提到：（）

从Gradle 2.2.0（2016年9月发布）开始，您可以使用multiDexKeepFile api

android {
buildTypes {
    debug {
        ...
        multiDexEnabled true
        multiDexKeepFile file('multidex_keep_file.txt')
    }
}

}

其中，multidex_keep_file.txt是每行包含一个类的文件，需要显式添加到主索引中

 com/test/TestClass.class
 com/test/TestClass.class

另一种方法是：使用multiDexKeepProguard保存整个包

-keep class com.test.** { *; }

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什么的4.4版？安卓的？这已经快6年了。你启用多重索引了吗？是的，它是Android版本4.4i添加的多重索引，可能会重复