Cannot refer to a non-final variable image inside an inner class 关于android 的final
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在方法中定义的变量是局部变量时，当方法返回时，局部变量对应的栈就被回收了，当方法内部类去访问局部变量时就会发生错误。当在变量前加上final时，变量就不在是真的变量了，成了常量，这样在编译器进行编译时(即编译阶段)就会用变量的值来代替变量，这样就不会出现变量清除后，再访问变量的错误。
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