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default_focus只能让view初始化的时候，控件获得光标，但是如何在执行一段程序后，让某一个控件获得光标呢？我现在扫描barcode后，光标就自动消失了，我想让barcode扫描后，还有有一个控件可以获得光标，请问有什么办法吗？谢谢！