记录一个自定义dialog时遇见的空指针异常

 android.view.InflateException: Binary XML file line #21: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:768)
        at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:734)
        at android.view.LayoutInflater.rInflate(LayoutInflater.java:867)
        at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:828)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:519)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:427)
        at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
        at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:418)
        at android.app.Dialog.setContentView(Dialog.java:528)
        at com.ccl.keyassistant.view.CustomDialog.<init>(CustomDialog.java:50)
        at com.ccl.keyassistant.view.CustomDialog.<init>(CustomDialog.java:35)
        at com.ccl.keyassistant.view.CustomDialog.<init>(CustomDialog.java:41)
        at com.ccl.keyassistant.view.CustomDialog.<init>(CustomDialog.java:31)
        at com.ccl.keyassistant.activity.GuideActivity.onClick(GuideActivity.java:140)
        at android.view.View.performClick(View.java:6266)
        at android.view.View$PerformClick.run(View.java:24730)
        at android.os.Handler.handleCallback(Handler.java:793)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:176)

自定义dialog代码

public CustomDialog(Context context,int layout,int themeResId,int height,int width,int gravity,int anim){
        super(context,themeResId);
        //设置显示布局
        //此处报空指针异常
       setContentView(layout);}
        //设置宽高
        Window window = getWindow();
        WindowManager.LayoutParams attributes = window.getAttributes();
        attributes.width = width;
        attributes.height = height;
        attributes.gravity = gravity;
        window.setAttributes(attributes);
        window.setWindowAnimations(anim);
    }

//此处报空指针异常
setContentView(layout)

原因在于layout布局文件中的View写成了view，大小写导致的错误。