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编辑：仍然需要帮助 >:( 添加了 Logcat，以及我只能用于模拟器但不能用于物理设备的清单修复。如果我将文件传输到 APK 并加载到我的设备上，该项目的 manifest.xml 文件将恢复为manifest.xml 文件的第二个副本。

5 分钟前，我让这段代码工作，整个应用程序将运行一个欢迎屏幕、6 个不同的“闪存卡”和一个带有按钮转换的退出屏幕。现在突然间，如果我按下任何按钮，应用程序就会崩溃。只是说应用程序意外停止工作。我会放 logcat，但错误消息总是处理清单中缺少的活动。我越来越沮丧，只想睡觉。

logcat 我得到了它总是去的底部清单文件。如果它手动添加其他人，那么我不明白。将项目转换为 APK 格式时不起作用

11-04 05:29:01.912: D/gralloc_goldfish(819): Emulator without GPU emulation detected.
11-04 05:29:04.302: D/AndroidRuntime(819): Shutting down VM
11-04 05:29:04.302: W/dalvikvm(819): threadid=1: thread exiting with uncaught exception (group=0x41465700)
11-04 05:29:04.382: E/AndroidRuntime(819): FATAL EXCEPTION: main
11-04 05:29:04.382: E/AndroidRuntime(819): android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.androidassignment2/com.example.androidassignment2.MainActivity}; have you declared this activity in your AndroidManifest.xml?
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1628)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.app.Activity.startActivityForResult(Activity.java:3390)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.app.Activity.startActivityForResult(Activity.java:3351)
11-04 05:29:04.382: E/AndroidRuntime(819):  at com.example.androidassignment2.Startup$1.onClick(Startup.java:22)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.view.View.performClick(View.java:4240)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.view.View$PerformClick.run(View.java:17721)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.os.Handler.handleCallback(Handler.java:730)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.os.Looper.loop(Looper.java:137)
11-04 05:29:04.382: E/AndroidRuntime(819):  at android.app.ActivityThread.main(ActivityThread.java:5103)
11-04 05:29:04.382: E/AndroidRuntime(819):  at java.lang.reflect.Method.invokeNative(Native Method)
11-04 05:29:04.382: E/AndroidRuntime(819):  at java.lang.reflect.Method.invoke(Method.java:525)
11-04 05:29:04.382: E/AndroidRuntime(819):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
11-04 05:29:04.382: E/AndroidRuntime(819):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-04 05:29:04.382: E/AndroidRuntime(819):  at dalvik.system.NativeStart.main(Native Method)

工作清单文件修复

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidassignment2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.androidassignment2.Startup"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.androidassignment2.DisplayMessageActivity"
            android:label="@string/title_activity_display_message"
            android:parentActivityName="com.example.AndroidAssignment2.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.example.AndroidAssignment2.MainActivity" />
        </activity>

        <activity
            android:name="com.example.androidassignment2.AndroidAssignment2_1" >

        </activity>
                <activity
            android:name="com.example.androidassignment2.AndroidAssignment2_2" >

        </activity>
                <activity
            android:name="com.example.androidassignment2.AndroidAssignment2_3" >

        </activity>
                <activity
            android:name="com.example.androidassignment2.AndroidAssignment2_4" >

        </activity>
                <activity
            android:name="com.example.androidassignment2.AndroidAssignment2_5" >

        </activity>

                        <activity
            android:name="com.example.androidassignment2.AndroidAssignment2" >

        </activity>

                               <activity
            android:name="com.example.androidassignment2.MainActivity" >

        </activity>
    </application>

</manifest>

一旦放入 apk，所有活动都会消失，这会在将项目放入 apk 后发生在清单文件中

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidassignment2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.androidassignment2.Startup"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.androidassignment2.DisplayMessageActivity"
            android:label="@string/title_activity_display_message"
            android:parentActivityName="com.example.AndroidAssignment2.MainActivity" >
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.example.AndroidAssignment2.MainActivity" />
        </activity>
    </application>

</manifest>

编辑：清单之前和之后。

LOGCAT 只是说活动没有在清单中声明

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