修复停止扫描后内存泄漏 #472
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修复停止扫描后内存泄漏 #472
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如果外部扫描通过匿名类设置监听后，停止扫描后对象无法自动释放，
因为匿名类默认持有外部activity对象，然后单例持有匿名类形成循环引用，导致activity退出后无法gc