android java.lang.IllegalStateException: System services not available to Activities before onCreate
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java.lang.IllegalStateException: System services not available to Activities before onCreate()
出现这种情况一般是因为 通过使用new关键字实例化Activity类,这样是错误的。因为Activity是系统通过
ActivityManagerService创建管理的。 new之后,创建了对象,但没有创建这个Activity,要知道Activity的对象和在Android中真正表示的东西,不是一样的。 对象创建完成后,需要系统对其进行一系列的init和管理。在这个创建的过程中,会回调Acitivity中的onCreate方法,这个方法调用之后,才能说明Activity是创建完成了。 所以就不能使用new关键字实例化Activity对象,要通过startActivity的方式,实例化这个Activity对象。
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