Android错误：unable to find explicit activity class
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没有找到明确的活动项！！！
在Android两个实体间切换中出现这个错误，是因为在AndroidManifest.xml没有定义另外一个实体。只需加入第二个实体即可。所有用到的Activity都必须在AndroidManifest.xml中注册，否则会报空指针错误。
<activity android:name=".HomePage"></activity>
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