根据说明,EditText的getText()方法返回值Editable,这有什么特别的用处么?能不能用返回string类型代替?官方对editable的说明:This is the interface for text whose content and markup can be changed (as opposed to immutable text like Strings).实现不可修改功能,为什么不用StringBuilder或者StringBuffer代替?
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