java.lang.NoClassDefFoundError的：Android Studio中添加新的模块时，android.support.v4.app.NavUtilsJB错误 [英] java.lang.NoClassDefFoundError: android.support.v4.app.NavUtilsJB error when adding new module in Android Studio

问题描述

我有一个奇怪的错误添加新的模块（ https://github.com/lomza/android - 颜色选取器）到我的项目。如果没有这个模块项目运行良好，但如果这个项目作为模块添加到我的主要项目，并编译它 - 一切看起来不错，但应用程序启动和关闭的力量瞬间给我这个错误：

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该模块 - 再次一切运行正常。我有添加任何新的模块到我的项目相同的问题。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?

编辑：我发现，项目运行在21 API罚款，但如果我在18 API运行它，我得到错误

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

我发现这个问题的解决方案。我是用multidexing，这是只有在棒棒糖设备可用，因此，在pre-棒棒糖设备使用它，我需要加入这一行

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
到的build.gradle 文件

和这一行
 的android：NAME =android.support.multidex.MultiDexApplication到的Andr​​oidManifest.xml 在 ＆LT;参加办法标记。

对于我 - 现在一切正常。

For me - now everything works fine.

编辑：而不是添加行的android：名称清单中，你可以添加 multiDexEnabled = TRUE 到 gradle这个文件中的 defaultConfig 。

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

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