blocks|key|922010|text|好吧，你有一个java.lang.ClassNotFoundException。这意味着应用程序运行时中缺少一个类。您应该检查是否已将所有库添加到构建路径中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922011|右键单击您的项目->属性->+java+build+path+->库，添加您的库或创建一个包含您的类的库，并为您的库启用订单导出。|922012|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Well you have a java.lang.ClassNotFoundException. That means a class is missing in the application runtime. You should check wheather you have added all your libs to the build path.

Right click on your project -> properties -> java build path -> libraries, add your libs or create one containing your classes and enable order export for your libs.

blocks|key|1136597|text|是的，我也遇到了同样的问题。这是因为我在清单文件的应用程序节点中指定了android:name属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1136598|您的Android+Manifest文件可能如下所示：|1136599|+++<application+
+++++++android:name="Novak+ESC+Track+guide"+
+++++++android:icon="@drawable/icon"+
+++++++android:label="@string/app_name"+
+++++++android:description="@string/help_text"+>|code-block|syntax|javascript|1136600|不要使用android:name属性！除非你已经实现了一个自定义的Application对象。|1136601|application:name属性与应用程序的名称无关。这是要作为Application实例加载的特定类的名称。这就是为什么如果那个类不存在，你会得到ClassNotFoundException的原因。|1136602|对于应用程序的名称，请使用同一应用程序节点上的android:label属性。|1136603|去掉它，它就可以工作了：|1136604|<application+
++++android:icon="@drawable/icon"+
++++android:label="@string/app_name"+
++++android:description="@string/help_text"+>|1136605|entityMap^0|Z|C|0|0|0|4|C|0|0|G|Y|B|24|M|0|N|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|O|3|P|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1G|8|@]|D|@]|E|$]]|$1|U|3|V|5|J|7|1H|8|@]|D|@]|E|$K|L]]|$1|W|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|X|$]]

Yep, I had this exact same problem. It was because I specified the <code>android:name</code> attribute in the application node in the manifest file.
Your Android Manifest file probably looks something like this:
<pre><code> &lt;application 
 android:name=&quot;Novak ESC Track guide&quot; 
 android:icon=&quot;@drawable/icon&quot; 
 android:label=&quot;@string/app_name&quot; 
 android:description=&quot;@string/help_text&quot; &gt;
</code></pre>
<h1>Do not use the <code>android:name</code> attribute! unless you've implemented a custom Application object.</h1>
The <code>application:name</code> attribute has nothing to do with the name of your app. This is the name of a specific class to load as your <code>Application</code> instance. That's why you would get the <code>ClassNotFoundException</code> if that class wouldn't exist.
<h2>For the name of the app use the <code>android:label</code> attribute on this same application node instead.</h2>
Remove it and it should work:
<pre><code>&lt;application 
 android:icon=&quot;@drawable/icon&quot; 
 android:label=&quot;@string/app_name&quot; 
 android:description=&quot;@string/help_text&quot; &gt;
</code></pre>

blocks|key|922106|text|我知道这个问题已经得到了回答，但事实可能并非如此。但我收到了这个错误，我想我应该把原因发布出来，以防对其他人有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922107|所以我收到了这个错误，几个小时后，我羞涩地意识到我没有选中'Project+>+Build+Automatically‘。所以，虽然我没有编译错误，但这就是我得到这个错误的原因。当我意识到我实际上并没有在部署之前构建项目时，一切都开始正常工作:-/|922108|好吧，这就是我的故事:-)|922109|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I know this question has been answered, and it likely wasn't the case. But I was getting this error, and figured I'd post why in case it can be helpful to anyone else.

So I was getting this error, and after several hours sheepishly realized that I had unchecked 'Project > Build Automatically'. So although I had no compilation errors, this is why I was getting this error. Everything started working as soon as I realized that I wasn't actually building the project before deploying :-/

Well, that's my story :-)

blocks|key|1136680|text|你是否在不同的环境中使用你的代码，比方说，使用Dropbox或类似的东西？你使用任何库或类似的库吗？在共享工作区文件后，我遇到了很多麻烦，我修复了它，并重新配置了依赖项。希望对某些人有帮助！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1136681|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Are you using your code in different enviroments, let's say, by using Dropbox or something like that? Do you use any library or similar? I had a lot of troubles after sharing the workspace files and I fixed it reconfiguring dependences. Hope it helps somebody!

blocks|key|1136822|text|在我的例子中，我必须在主活动的清单文件中添加android:name=".activity.SkeletonAppActivity"而不是android:name=".SkeletonAppActivity"。SkeletonAppActivity与应用程序类位于不同的包中。祝好运!|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1136823|entityMap^0|M|18|1X|Z|2X|J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

In my case I had to add <code>android:name=".activity.SkeletonAppActivity"</code>
instead of <code>android:name=".SkeletonAppActivity"</code> in the manifest file for the main activity.
<code>SkeletonAppActivity</code> was in a different package from the application class. Good luck!

blocks|key|922373|text|在升级到最新的ADT/SDK后，今天遇到了这样的问题。我花了很长时间。检查我是否使用了google-apis+(用于地图)，used+library，清理了项目等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922374|删除.project并添加一个新的项目(创建新的android项目)最终解决了这个问题。|922375|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Had this sort of problem today after upgrading to latest ADT/SDK. Took me quite a while. Checked that i used google-apis (for maps), uses-library, cleaned the project etc.

Deleting the .project and adding a fresh one (create new android project) finally solved it.

blocks|key|1136927|text|确保清单文件中的android:hasCode未设置为false。这就解决了我的问题！|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1136928|entityMap^0|8|F|R|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Make sure that <code>android:hasCode</code> is not set to <code>false</code> in your manifest file. This is what solved the problem for me!

blocks|key|922474|text|检查类中的包名是否与清单文件中的包名匹配。这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922475|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Check if the package name in the class matches the package name in the manifest file. This worked for me

blocks|key|922523|text|当我将构建目标更改为3.2时，发生了类似的事情。在深入研究之后，我发现a将jar库文件夹命名为"+lib“，而不是"libs”。我只是将其重命名为libs，并更新了Java构建路径上的引用，一切都恢复正常。也许这会帮助一些人..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922524|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Something like this happened when I changed the build target to 3.2. After digging around I found that a had named the jar lib folder "lib" instead of "libs". I just renamed it to libs and updated the references on the Java build path and everything was working again. Maybe this will help someone...

blocks|key|1137075|text|当我在android的早期版本上运行我的应用程序时，我得到了这个错误。我认为SearchView向后兼容Android1.5，但它是在3.0版本中创建的。我从代码中删除了它的引用，它起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1137076|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/widget/SearchView.html^0|12|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I got this error when I ran my app on earlier versions of android. I thought <a href="http://developer.android.com/reference/android/widget/SearchView.html" rel="nofollow">SearchView</a> was backwards compatible to Android 1.5, but it was created in 3.0. I removed its reference from the code and it worked.

blocks|key|1137191|text|我使用了一个在我的一个活动中声明为'final‘的超类型方法(特别是'isResumed()’方法)。只有在重启我的开发设备之后，LogCat中才会显示实际的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1137192|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I used a supertype method that was declared 'final' in one of my Activities (specifically the 'isResumed()' method). The actual error showed in LogCat only after restarting my development device.

blocks|key|1137280|text|有相同的错误:+java.lang.RuntimeException:+Unable+to+instantiate+activity+(classnotfound)+FIRST+try+to+change+the+build+platform+(2.3.3+->+2.2+->+2.3.3)+FIRST+try+to+change+the+build+platform(2.3.3->2.2->2.3.3)为我工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1137281|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Had the same error: java.lang.RuntimeException: Unable to instantiate activity (classnotfound)
FIRST try to change the build platform (2.3.3 -> 2.2 -> 2.3.3) worked for me.

blocks|key|1137364|text|在我的例子中，当我将我的启动器活动移动到不同的包而没有更新清单文件时，就会发生这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1137365|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case it happen when i moved my launcher activity to different package without updating manifest file.

blocks|key|922907|text|对我来说，从Eclipse“关闭”应用程序，然后“重新打开”项目，就解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|922908|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me, 'closing' the application from Eclipse and 'reopening' of the project, resolved the issue.

blocks|key|1137440|text|我在android+os版本4.1.2中也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1137441|将以下行添加到应用程序标记中android:label="@string/app_name"下的AndroidManifest.xml|offset|length|style|CODE|1137442|android:name="android.support.multidex.MultiDexApplication"|code-block|syntax|javascript|1137443|这可能会帮助一些有同样问题的人。|1137444|entityMap^0|0|E|W|1C|J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

I have same problem in android os version 4.1.2

add below line to your <code>AndroidManifest.xml</code> below <code>android:label="@string/app_name"</code> in application tag

<pre><code>android:name="android.support.multidex.MultiDexApplication"
</code></pre>

This may help some one with same problem.

blocks|key|1137480|text|在我的build.gradle文件中将minifyEnabled设置为false为我修复了这个问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1137481|release+{
++++minifyEnabled+false
}|code-block|syntax|javascript|1137482|entityMap^0|3|C|J|D|Z|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

Setting <code>minifyEnabled</code> to <code>false</code> in my <code>build.gradle</code> file fixed the issue for me. 

<pre><code>release {
 minifyEnabled false
}
</code></pre>

I have created and published my first Android app. It's very simple. It works fine on simulator and some phones, but I am getting this error:

<pre><code>java.lang.RuntimeException: Unable to instantiate application cz.teamnovak.droid.Novak ESC Track guide: java.lang.ClassNotFoundException: cz.teamnovak.droid.Novak ESC Track guide in loader dalvik.system.PathClassLoader[/data/app/cz.teamnovak.droid-1.apk]
 at android.app.ActivityThread$PackageInfo.makeApplication(ActivityThread.java:649)
 at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4232)
 at android.app.ActivityThread.access$3000(ActivityThread.java:125)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2071)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loop(Looper.java:123)
 at android.app.ActivityThread.main(ActivityThread.java:4627)
 at java.lang.reflect.Method.invokeNative(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:521)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
 at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: cz.teamnovak.droid.Novak ESC Track guide in loader dalvik.system.PathClassLoader[/data/app/cz.teamnovak.droid-1.apk]
 at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
 at android.app.Instrumentation.newApplication(Instrumentation.java:942)
 at android.app.ActivityThread$PackageInfo.makeApplication(ActivityThread.java:644)
 ... 11 more
</code></pre>

Any idea what can cause this?

java.lang.ClassNotFoundException on working app

Android

Eclipse

Java

我已经创建并发布了我的第一个Android应用程序。这很简单。它在模拟器和一些手机上工作得很好，但我得到了这个错误：java.lang.RuntimeException: Unable to instantiate application cz.teamnovak.droid.Novak ESC Track guide...

问工作应用上的java.lang.ClassNotFoundException
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