出这个异常的原因是在项目中添加了新lication类（public class Application extends lication）之后，没有在AndroidManifest.xml中添加该类的声明，所以编译器抛出异常： java.lang.ClassCastException: android.app.Application cannot be cast to 类名
<application android:icon="@drawable/icon" android:label="@string/app_name"
android:name=".你所新建的lication类名">
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