Java Android Studio无法找到显式活动类

我有一个应用程序，允许我从mysql数据库中修改/添加/删除。当我运行该应用程序时，它可以很好地打开，但是当我尝试单击“ViewAllEmployee”按钮时，我不断收到一个错误，说它找不到显式活动类。我在网上查找并尝试了所有以前对有此问题的人有效的解决方案。我已经将它添加到我的AndroidManifest中，但它仍然不想工作。有人能帮忙吗？事实上，我已经花了好几个小时试图解决这个问题了

AndroidManifest.xml

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

<uses-permission android:name="android.permission.INTERNET" />

<uses-sdk
android:minSdkVersion="18"
android:targetSdkVersion="21" />

<application
android:allowBackup="true"
android:label="@string/app_name" >
<activity
    android:name="com.example.assignment.androidassignment.MainActivity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Dialog" >

<intent-filter>
        <action android:name="android.intent.action.MAIN" />

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

    <activity
            android:name="com.example.assignment.androidassignment.ViewAllEmployee"
        />
</activity>
</application>

</manifest>

从

到

从

到

请更改上述内容，这是因为清单中嵌套了活动

您正在清单中嵌套

标记。把它们拆开：

<activity
    android:name="com.example.assignment.androidassignment.MainActivity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Dialog" >

    <intent-filter>
        <action android:name="android.intent.action.MAIN" />    
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
<activity
     android:name="com.example.assignment.androidassignment.ViewAllEmployee"/>

真管用！这么简单的事情会让人发疯哈哈。谢谢@Manojkumar:）没问题，我还有一个问题在过去几个小时里一直困扰着我，可以吗，还是你很忙？不管怎样，我都会把它贴出来，给你贴上标签。如果你很忙，那么不要担心。我感谢你迄今为止所给予的帮助：）@MrsEdyes这将是一个新的帖子，不久将为你贴上标签@MrsEd

12-09 03:34:46.634 2489-2489/? E/AndroidRuntime: FATAL EXCEPTION: main
 =Process: com.example.assignment.androidassignment, PID: 2489
 android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.assignment.androidassignment/com.example.assignment.androidassignment.ViewAllEmployee}; have you declared this activity in your AndroidManifest.xml?
 at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1628)
 at android.app.Instrumentation.execStartActivity(Instrumentation.java:1424)
 at android.app.Activity.startActivityForResult(Activity.java:3424)
 at android.app.Activity.startActivityForResult(Activity.java:3385)
 at android.app.Activity.startActivity(Activity.java:3627)
 at android.app.Activity.startActivity(Activity.java:3595)
 at com.example.assignment.androidassignment.MainActivity.onClick(MainActivity.java:91)
 at android.view.View.performClick(View.java:4438)
 at android.view.View$PerformClick.run(View.java:18422)
 at android.os.Handler.handleCallback(Handler.java:733)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:136)
 at android.app.ActivityThread.main(ActivityThread.java:5001)
 at java.lang.reflect.Method.invokeNative(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:515)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
 at dalvik.system.NativeStart.main(Native Method)

if(v == buttonView){
    startActivity(new Intent(this,com.example.assignment.androidassignment.ViewAllEmployee.class));
}

if(v == buttonView){
    startActivity(new Intent(MainActivity.this,ViewAllEmployee.class));
}

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

<uses-permission android:name="android.permission.INTERNET" />

<uses-sdk
android:minSdkVersion="18"
android:targetSdkVersion="21" />

<application
android:allowBackup="true"
android:label="@string/app_name" >
<activity
    android:name="com.example.assignment.androidassignment.MainActivity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Dialog" >

<intent-filter>
        <action android:name="android.intent.action.MAIN" />

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

    <activity
            android:name="com.example.assignment.androidassignment.ViewAllEmployee"
        />
</activity>
</application>

</manifest>

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

<uses-permission android:name="android.permission.INTERNET" />

<uses-sdk
android:minSdkVersion="18"
android:targetSdkVersion="21" />

<application
android:allowBackup="true"
android:label="@string/app_name" >
<activity
    android:name="com.example.assignment.androidassignment.MainActivity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Dialog" >

<intent-filter>
        <action android:name="android.intent.action.MAIN" />

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


</activity>
 <activity
            android:name="com.example.assignment.androidassignment.ViewAllEmployee"
        />
</application>

</manifest>

<activity
    android:name="com.example.assignment.androidassignment.MainActivity"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Holo.Dialog" >

    <intent-filter>
        <action android:name="android.intent.action.MAIN" />    
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>
<activity
     android:name="com.example.assignment.androidassignment.ViewAllEmployee"/>