android 因为没有赋null，报以下错：has already been added to the window manager

private static ProgressDialog progressDialog;

 

 

public static void progressDialogClose() {
        if (progressDialog != null) {
            progressDialog.dismiss();
            progressDialog = null;
        }
    }

 

关闭的时候，也将成赋成null，就可以了。