当程序报错：java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportantForAccessibility()' on a null object reference
如图：
其实不管是LIstView还是GridView都会可能出现这种报错，原因都是：对应的Adapter的getView方法返回为空，出现的这个空指针现象
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