java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()'
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使用Document创建xml文档时，element.setAttribute(String arg1, String arg2)，其中的arg1、arg2一定不能为null，否则报错：
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()'
自己犯的这个错误，折腾了半天，在此记一笔
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- java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()'
- java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Integer.intValue()'
- Attempt to invoke virtual method 'int java.lang.Integer.intValue()
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- error: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getIm
- java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getImportant
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