在android中构建项目时出现了什么错误？

我得到这个错误！！找不到类

请检查以下错误日志

06-29 09:09:59.384: ERROR/AndroidRuntime(545): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{s.s/s.s.MainActivity}: java.lang.ClassNotFoundException: s.s.MainActivity in loader dalvik.system.PathClassLoader[/data/app/s.s-2.apk]
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1544)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.os.Looper.loop(Looper.java:123)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.ActivityThread.main(ActivityThread.java:3647)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at java.lang.reflect.Method.invokeNative(Native Method)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at java.lang.reflect.Method.invoke(Method.java:507)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at dalvik.system.NativeStart.main(Native Method)
06-29 09:09:59.384: ERROR/AndroidRuntime(545): Caused by: java.lang.ClassNotFoundException: s.s.MainActivity in loader dalvik.system.PathClassLoader[/data/app/s.s-2.apk]
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1536)
06-29 09:09:59.384: ERROR/AndroidRuntime(545):     ... 11 more

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嗯，这意味着找不到该类：-）

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你们有一个叫做s.s.MainActivity的课程吗？您是否拼写错误（您的清单和来源之间的拼写不一致？）。您是否无意中使用ProGuard将其从apk中剥离？

查看您的文件。。。我认为不在那里添加活动会导致此问题

应该是这样的：

        <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

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您是否已将活动添加到Manifest.xml中？