android之在模拟器上启动时，Eclipse android 应用程序崩溃

你好 stackoverflow 社区，

我是android编程的新手。我创建的应用程序“加密”总是在模拟器上崩溃，并显示消息“不幸的是，加密已停止”。我正在学习本教程:https://www.sites.google.com/site/mobilesecuritylabware/3-data-location-privacy/lab-activity/cryptography/cryptography-mobile-labs/encryption-decryption/2-lab-activity/lab1 .谁能帮我找出问题所在？
非常感谢!

细节:
Mac OS X 10.7.5,
Eclipse SDK
版本:4.2.2
版本号:M20130204-1200

EncryptActivity.java 代码在上面给出的链接上。
应用名称:加密
Activity :加密 Activity
包名:Android.Encrypt

这是日志猫:

10-28 11:21:58.583: D/AndroidRuntime(1257): Shutting down VM 
10-28 11:21:58.583: W/dalvikvm(1257): threadid=1: thread exiting with uncaught exception (group=0x414c4700) 
10-28 11:21:58.603: E/AndroidRuntime(1257): FATAL EXCEPTION: main 
10-28 11:21:58.603: E/AndroidRuntime(1257): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{Android.Encrypt/Android.Encrypt.Android.Encrypt.EncryptActivity}: java.lang.ClassNotFoundException: Didn't find class "Android.Encrypt.Android.Encrypt.EncryptActivity" on path: DexPathList[[zip file "/data/app/Android.Encrypt-2.apk"],nativeLibraryDirectories=[/data/app-lib/Android.Encrypt-2, /system/lib]] 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.ActivityThread.access$600(ActivityThread.java:141) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.os.Handler.dispatchMessage(Handler.java:99) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.os.Looper.loop(Looper.java:137) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.ActivityThread.main(ActivityThread.java:5103) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at java.lang.reflect.Method.invokeNative(Native Method) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at java.lang.reflect.Method.invoke(Method.java:525) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at dalvik.system.NativeStart.main(Native Method) 
10-28 11:21:58.603: E/AndroidRuntime(1257): Caused by: java.lang.ClassNotFoundException: Didn't find class "Android.Encrypt.Android.Encrypt.EncryptActivity" on path: DexPathList[[zip file "/data/app/Android.Encrypt-2.apk"],nativeLibraryDirectories=[/data/app-lib/Android.Encrypt-2, /system/lib]] 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128) 
10-28 11:21:58.603: E/AndroidRuntime(1257):     ... 11 more 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="Android.Encrypt" 
    android:versionCode="1" 
    android:versionName="1.0" > 
 
    <uses-sdk 
        android:minSdkVersion="8" 
        android:targetSdkVersion="8" /> 
 
    <application 
        android:allowBackup="true" 
        android:icon="@drawable/ic_launcher" 
        android:label="@string/app_name" 
        android:theme="@style/AppTheme" > 
        <activity 
            android:name=".Android.Encrypt.EncryptActivity" 
            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> 

请您参考如下方法:

问题是你在 android:name 中指定了相关的类名 Activity 。并且 android 会将该名称附加到您指定的名称中，然后 android 得到 Android.Encrypt.Android.Encrypt.EncryptActivity而不是 Android.Encrypt.EncryptActivity just remove the dot of .Android.Encrypt.EncryptActivity` 在 Activity 元素中。