ClassNotFoundException的上课的时候​​有没有？ [英] ClassNotFoundException when the class is there?

问题描述

我有点坚持这一点。 Android是抛出一个的ClassNotFoundException 即使有这样一类。

I'm a bit stuck on this. Android is throwing a ClassNotFoundException even though there is such a class.

04-20 09:07:50.179: E/AndroidRuntime(525): FATAL EXCEPTION: main
04-20 09:07:50.179: E/AndroidRuntime(525): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.company.app/com.company.app.Main}: java.lang.ClassNotFoundException: com.company.app.Main
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.os.Handler.dispatchMessage(Handler.java:99)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.os.Looper.loop(Looper.java:137)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.ActivityThread.main(ActivityThread.java:4424)
04-20 09:07:50.179: E/AndroidRuntime(525):  at java.lang.reflect.Method.invokeNative(Native Method)
04-20 09:07:50.179: E/AndroidRuntime(525):  at java.lang.reflect.Method.invoke(Method.java:511)
04-20 09:07:50.179: E/AndroidRuntime(525):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-20 09:07:50.179: E/AndroidRuntime(525):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-20 09:07:50.179: E/AndroidRuntime(525):  at dalvik.system.NativeStart.main(Native Method)
04-20 09:07:50.179: E/AndroidRuntime(525): Caused by: java.lang.ClassNotFoundException: com.company.app.Main
04-20 09:07:50.179: E/AndroidRuntime(525):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
04-20 09:07:50.179: E/AndroidRuntime(525):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
04-20 09:07:50.179: E/AndroidRuntime(525):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.Instrumentation.newActivity(Instrumentation.java:1023)
04-20 09:07:50.179: E/AndroidRuntime(525):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
04-20 09:07:50.179: E/AndroidRuntime(525):  ... 11 more

有这样叫主 A类 Main.java 。

公共类主要扩展FragmentActivity 这是在包 com.company.app <​​/ code>。

public class Main extends FragmentActivity which is in the package com.company.app.

这是以前的工作，但是当我回到今天的应用工作，它只是停止工作。我不知道发生了什么。

It was working before but when I went back to work on the app today it just stopped working. I don't know what happened.

这是在清单中正确定义。

It is defined correctly in the Manifest.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.company.app"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="4" />
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" 
        android:theme="@android:style/Theme.Light" >
        <activity
            android:label="@string/app_name"
            android:name=".Main" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

几件事我已经试过：

• 重新启动Eclipse的


• 重新启动模拟器


• 卸载并重新安装应用程序在模拟器中


• 清洁项目。


• 检查是否根和的src 是来源构建路径的标签。

• Restarting Eclipse
• Restarting the emulator
• Uninstalling and reinstalling the app in the emulator
• Cleaning the project.
• Checking if gen and src is in the Source tab of the build path.

因为它看起来现在，我可能会放弃目前的项目，并从头开始。

As it looks right now, I may have to abandon the current project and start from scratch.

任何帮助将是非常美联社preciated。

Any help would be much appreciated.

更新：

该应用程序工作，如果主扩展活动而不是 FragmentActivity 。也许是一些与Android的支持包？

The app works if Main extends Activity instead of FragmentActivity. Perhaps it is something with the Android Support package?

更新2：

我是pretty肯定是。当我不使用的支持包，我用正常的片段班的Andr​​oid 3.0及以上版本，应用程序工作正常。

I'm pretty sure it is. When I don't use the support package and I use the normal Fragment classes in Android 3.0 and up, the app works fine.

问题已经得到解决。 ：）

The problem is now fixed. :)

由于某些原因，Android的支持包从删除自身在项目/库目录，它是从外部位置引用它（工作区目录）。

For some reason the Android support package removed itself from the /libs directory in the project and it was referencing it from an external location (outside the workspace directory).

我将迎来阿卜杜伊盖尔的第一个答案是正确的，他指示我在正确的轨道上。

I will mark Abdu Egal's first answer as correct as he directed me on the right track.

推荐答案

似乎没有在您的主要活动的OnCreate错误。你有没有提供的onCreate（捆绑savedInstance）如果是这样，请试着清除它，看看它是否工作呢。

It seems that there is an error in the onCreate of your main activity. Did you provide an onCreate(Bundle savedInstance) if so , try to clear it and see if it works then.

如果不工作，尝试使用扩展活动，而不是延长FrameActivity。

If that does not work, try to use extend Activity instead of extend FrameActivity.

好运气

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