java.lang.NoClassDefFoundError: android.support.v4.app.NavUtilsJB 在 Android Studio 中添加新模块时出错

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问题描述

添加新模块时出现奇怪的错误 (https://github.com/lomza/android-color-picker) 到我的项目.没有这个模块项目运行良好，但如果将此项目作为模块添加到我的主项目并编译它 - 一切看起来都不错，但应用程序启动并立即强制关闭给我这个错误:

I have a strange error adding new module (https://github.com/lomza/android-color-picker) to my project. Without this module project runs fine, but if add this project as module to my main project and compile it - everything looks good, but app starts and force closes instantly giving me this error:

FATAL EXCEPTION: main
    java.lang.NoClassDefFoundError: android.support.v4.app.NavUtilsJB
            at android.support.v4.app.NavUtils$NavUtilsImplJB.getParentActivityName(NavUtils.java:125)
            at android.support.v4.app.NavUtils.getParentActivityName(NavUtils.java:302)
            at android.support.v4.app.NavUtils.getParentActivityName(NavUtils.java:281)
            at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:142)
            at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123)
            at app.user.views.ActivityWelcome.onCreate(ActivityWelcome.java:33)
            at android.app.Activity.performCreate(Activity.java:5133)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5103)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

ActivityWelcome.java 33 行是 super.onCreate(savedInstanceState);

如果我从项目中删除这个模块 - 一切都会再次正常运行.我在向我的项目中添加任何新模块时遇到同样的问题.问题出在哪里?

If I remove this module from project - everything runs fine again. I have same problem adding any new module to my project. Where is the problem?

我发现该项目在 API 21 上运行良好，但如果我在 API 18 上运行它，则会出现错误.

I find out that project runs fine on API 21, but if I run it on API 18, I am getting error.

推荐答案

我找到了这个问题的解决方案.我使用的是多索引，它仅在 Lolipop 设备中可用，因此，要在 Lolipop 之前的设备中使用它，我需要添加此行

I found solution for this problem. I was using multidexing and it is available only in Lolipop devices, so, to use it in pre-Lolipop devices I needed to add this line

编译'com.android.support:multidex:1.0.0'到 build.gradle 文件

还有这一行android:name="android.support.multidex.MultiDexApplication" 到 标签中的 AndroidManifest.xml.

and this one line android:name="android.support.multidex.MultiDexApplication" to AndroidManifest.xml in <appplication tag.

对我来说 - 现在一切正常.

For me - now everything works fine.

，而不是在清单中向 android:name 添加行，您可以将 multiDexEnabled = true 添加到 gradledefaultConfig 中的 code> 文件.

instead of adding line to android:name in manifest, you can add multiDexEnabled = true to gradle file in defaultConfig.

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