Java Can'；使用Quick Blox示例聊天示例无法解决类未找到异常

我正在努力解决找不到类的错误。 我在谷歌上搜索了两周，但无法解决这个错误。。 我试了所有的问题，但都帮不了我

06-18 17:42:32.171: E/AndroidRuntime(17161): FATAL EXCEPTION: main
06-18 17:42:32.171: E/AndroidRuntime(17161): java.lang.RuntimeException: Unableto      instantiate activity ComponentInfo{com.quickblox.sample.chat/com.quickblox.sample.chat.ui.activities.SplashActivity}: java.lang.ClassNotFoundException: Didn't find class "com.quickblox.sample.chat.ui.activities.SplashActivity" on path: /data/app/com.quickblox.sample.chat-1.apk
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2171)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2295)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.ActivityThread.access$700(ActivityThread.java:150)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1280)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.os.Looper.loop(Looper.java:137)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.ActivityThread.main(ActivityThread.java:5279)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at java.lang.reflect.Method.invokeNative(Native Method)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at java.lang.reflect.Method.invoke(Method.java:511)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at   com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at dalvik.system.NativeStart.main(Native Method)
06-18 17:42:32.171: E/AndroidRuntime(17161): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.quickblox.sample.chat.ui.activities.SplashActivity" on path: /data/app/com.quickblox.sample.chat-1.apk
06-18 17:42:32.171: E/AndroidRuntime(17161):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at  java.lang.ClassLoader.loadClass(ClassLoader.java:501)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.Instrumentation.newActivity(Instrumentation.java:1071)
06-18 17:42:32.171: E/AndroidRuntime(17161):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2162)
06-18 17:42:32.171: E/AndroidRuntime(17161):    ... 11 more

Menifest文件是一个咆哮文件

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

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="19" />

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

    <application
        android:name=".App"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"

        android:theme="@style/AppTheme">
        <activity
            android:name=".ui.activities.SplashActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:label="@string/app_name"
            android:screenOrientation="portrait">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".ui.activities.MainActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="portrait" />
        <activity
            android:name=".ui.activities.ChatActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:screenOrientation="portrait"
            android:windowSoftInputMode="adjustResize" />
        <activity
            android:name=".ui.activities.LoginActivity"
            android:label="Login" />
        <activity
            android:name=".ui.activities.RegistrationActivity"
            android:label="Registration" />
    </application>

</manifest>

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我在Manifest中添加了Acitivity，并将包名替换为

package="com.quickblox.sample.chat.ui.activities"

及

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试图用答案解决问题，但在更改包名后，我在导入com.quickblox.sample.chat.R时出错，原因是您忘记在manifest.xml中添加活动，或者您的项目中没有该类。我已在清单文件中添加了活动。您已在清单文件中添加了具有相应包名的活动。有时它属于另一个包。没有。它是正确的。我也检查它。什么是。ui。活动。在舱单上？请告诉我.Thnx以获得回复，但有六个不同的包“com.quickblox.sample.chat”、“com.quickblox.sample.chat.core”、“com.quickblox.sample.chat.model”、“com.quickblox.sample.chat.ui.activities”、“com.quickblox.sample.chat.ui.adapters”、“com.quickblox.sample.chat.ui.fragments”你在你的应用程序中添加了quickblox-android-1.2.2.jar的引用了吗？我从项目属性->java构建路径->添加外部jar中添加了库…然后从订单和导出中检查它…还将它添加到项目的libs文件夹中。从libs文件夹中删除并清理和构建应用程序。
<activity
            android:name=".SplashActivity"

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