NullPointerException:... java.lang.String.equals(java.lang.Object)' on a null object reference空指标报错

a.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.frameview/com.example.frameview.NewsContentActivity}: android.view.InflateException: Binary XML file line #6: Binary XML file line #21: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference

 

xml布局文件导致的空指标，需要检查xml布局文件里的控件标签是否使用正确

View标签使用错误，View写错成view