Android的活动了ClassNotFoundException - 尝试一切 [英] Android Activity ClassNotFoundException - tried everything

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问题描述

我刚刚重构一个应用程序到一个框架库和应用程序，但现在当我试着开始在模拟器中，我得到了下面的错误堆栈跟踪应用程序：

I've just refactored an app into a framework library and an application, but now when I try and start the app in the emulator I get the following error stack trace:

06-02 18:22:35.529: E/AndroidRuntime(586): FATAL EXCEPTION: main
06-02 18:22:35.529: E/AndroidRuntime(586): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.matthewrathbone.eastersays/com.matthewrathbone.eastersays.EasterSimonSaysActivity}: java.lang.ClassNotFoundException: com.matthewrathbone.eastersays.EasterSimonSaysActivity in loader dalvik.system.PathClassLoader[/data/app/com.matthewrathbone.eastersays-1.apk]
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.os.Looper.loop(Looper.java:123)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-02 18:22:35.529: E/AndroidRuntime(586):  at java.lang.reflect.Method.invokeNative(Native Method)
06-02 18:22:35.529: E/AndroidRuntime(586):  at java.lang.reflect.Method.invoke(Method.java:521)
06-02 18:22:35.529: E/AndroidRuntime(586):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-02 18:22:35.529: E/AndroidRuntime(586):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-02 18:22:35.529: E/AndroidRuntime(586):  at dalvik.system.NativeStart.main(Native Method)
06-02 18:22:35.529: E/AndroidRuntime(586): Caused by: java.lang.ClassNotFoundException: com.matthewrathbone.eastersays.EasterSimonSaysActivity in loader dalvik.system.PathClassLoader[/data/app/com.matthewrathbone.eastersays-1.apk]
06-02 18:22:35.529: E/AndroidRuntime(586):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
06-02 18:22:35.529: E/AndroidRuntime(586):  at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
06-02 18:22:35.529: E/AndroidRuntime(586):  at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
06-02 18:22:35.529: E/AndroidRuntime(586):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
06-02 18:22:35.529: E/AndroidRuntime(586):  ... 11 more

通常这意味着清单文件是错误的，在某种程度上，但我已经双重检查一切我能想到的。

Usually this means that the manifest file is wrong in some way, but I've double checked everything I can think of.

下面是我的活动类：

package com.matthewrathbone.eastersays;

import android.os.Bundle;

import com.rathboma.simonsays.Assets.Season;
import com.rathboma.simonsays.SeasonPicker;
import com.rathboma.simonsays.SimonSaysActivity;

    public class EasterSimonSaysActivity extends SimonSaysActivity {

      @Override
      protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
      }

      @Override
      protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
      }

      @Override
      public SeasonPicker getSeasonPicker() {
       return new SeasonPicker(){
        @Override
        public Season getSeason() {
          // TODO Auto-generated method stub
          return Season.EASTER;
        }
       };
      }
    }

正如你所看到的，它的上市在正确的清单：

As you can see, it's listed correctly in the manifest:

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

    <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".EasterSimonSaysActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我不知道如何解决这一问题，并且将AP preciate任何帮助。我已经扫描的就这么多类似的问题，没有看到这个特定的行为。

I have no idea how to fix this, and would appreciate any help. I've scanned many similar questions on SO without seeing this particular behavior.

更多信息：

  • 我已经生成APK内检查和类有一个条目 该classes.dex文件
  • 在我试过清洁/建设项目 日食
  • 在我使用的是全新的设备的图像不具有试过 在APK的上一个副本已
  • 在我的库项目变成 一个普通的Java，然后又变成一个Android项目，没有 差异
  • 添加抽象SimonSaysActivity到清单没什么区别。
  • 在我试图使每个依赖一个Android库项目，并同步他们需要的Andr​​oid版本，它并没有帮助
  • I've checked inside the generated APK and the class has an entry in the classes.dex file
  • I've tried cleaning/building the project in eclipse
  • I've tried using a totally new device image that doesn't have a copy of the APK on it already
  • I've changed the library project into a regular java, then changed back into an android project, no difference
  • Adding the abstract SimonSaysActivity to the manifest makes no difference.
  • I've tried making every dependency an android library project, and syncing the android version that they require, it did not help

实测值的溶液（见下文）。为了大家公布答案/评论：你所有的岩石，感谢您帮助我工作，通过问题

Found the solution (see below). To everyone that posted an answer / comment: You all rock, thanks for helping me work through the problems!

看起来这是一个由SDK工具升级推出。由于下面@Nick在该链接的评论： <一href="http://iqadd.com/item/noclassdeffounderror-adt-fix">http://iqadd.com/item/noclassdeffounderror-adt-fix

Looks like this is introduced by an SDK tools upgrade. Thanks to @Nick below in the comments for this link: http://iqadd.com/item/noclassdeffounderror-adt-fix

推荐答案

我用我自己的项目的一些时间玩了，我可以复制你的问题，并得到完全相同的异常堆栈跟踪尝试运行我的主要项目时， ，所以我觉得这可能是原因：

I spent some time play with my own project, and I am able to replicate your problem and get exactly the same exception stack trace when trying to run my main project, so I think this could be the cause:

就像我的想法，这是所有关于你如何引用您的Andr​​oid库项目在Android主体工程，一个简单的Eclipse配置设置。

Just like what I thought, it is all about how you reference your Android library project in the Android main project, a simple Eclipse configuration settings.

错误的方式：
右击主项目，选择属性 - ＆GT; Java构建路径 - ＆GT;项目 - ＆GT;添加... ，这个附加了Android库项目作为Android的主要项目的构建路径依赖的项目，这是行不通的。如果所有必需的Andr​​oid相关的资源，在主要项目中定义的，你不会得到任何错误在编译时，但是运行应用程序的时候，你在问题中描述的异常。

The Wrong Way:
Right click main project, choose Properties -> Java Build Path -> Projects -> Add..., this add the Android library Project as a dependency project in Android main project's build path, this does not work. If all required Android-related resources are defined in main project, you will not get any error at compile time, but when run the application, you get the exception described in the question.

的正确方法：
右击主项目，选择属性 - ＆GT;安卓，在图书馆部分，在这里添加你的Andr​​oid库项目。查看官方开发指南<一href="http://developer.android.com/guide/developing/projects/projects-eclipse.html#ReferencingLibraryProject">Referencing库项目。这应该可以解决所有的问题。另外请注意，你必须使用相对路径引用实际的Andr​​oid库项目，如图书馆计划说明 - 发展的考虑

The Correct Way:
Right click main project, choose Properties -> Android, in the Library section, add your Android library project here. Check out official dev guide Referencing a library project. This should fix all your problem. Also note that you have to use relative path reference the actual Android library project, as stated in the Library Project - Development considerations.

希望这有助于。

这篇关于Android的活动了ClassNotFoundException - 尝试一切的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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