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NullPointerException accessing views in onCreate()
...d-generated code.
The view is in the fragment layout (fragment_main.xml) and not in the activity layout (activity_main.xml). onCreate() is too early in the lifecycle to find it in the activity view hierarchy, and a null is returned. Invoking a method on null causes the NPE.
The preferred solution...
What is the default access modifier in Java? [duplicate]
... modifier or no modifier (package-private) just as with top-level classes, and with the same meaning.
Full story you can read here (Which I wrote recently):
http://codeinventions.blogspot.com/2014/09/default-access-modifier-in-java-or-no.html
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不同品牌的防火墙组成高可靠性集群 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...设备 ASG 425 支持OSPF BGP PIM路由协议
第二台设备SSG 520
支持BGP OSPF PIM RIP 路由协议
第一种方法
说明：两个防火墙属于不同品牌HA 等技术想都不用想了，想通过VRRP实现主备切换， juniper 我只发现了NSRP 的选项 Astarto 根本...
How to fix “no valid 'aps-environment' entitlement string found for application” in Xcode 4.3?
...doing this is to establish a procedure for some other team members to use, and have not been able to find an up to date, working version of such instructions elsewhere on the web. Our shop is fairly new to iOS dev, I personally am completely inexperienced with iOS dev and Xcode. I've stumbled thro...
Java: How to convert List to Map
...gue about what would be the optimal way to convert List to Map in Java and if there any specific benefits of doing so.
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How to prevent line break at hyphens on all browsers
...words” (sequences of non-whitespace characters separated by whitespace) and wrapping each “word” that contains a hyphen inside nobr markup. So input data like bla bla foo-bar bla bla would be turned to bla bla <nobr>foo-bar</nobr> bla bla.
You might even consider inserting nobr ma...
“unmappable character for encoding” warning in Java
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Absolutely. (This is better handled in C#, where unicode escaping is only applied in certain contexts - but then there's the dangerous \x escape sequence as well, which is awful.)
– Jon Skeet
Jan 21 '09 at 11:38
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Install a Python package into a different directory using pip?
I know the obvious answer is to use virtualenv and virtualenvwrapper, but for various reasons I can't/don't want to do that.
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In Django, how do I check if a user is in a certain group?
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then user.groups.all() returns [<Group: Editor>].
Alternatively, and more directly, you can check if a a user is in a group by:
if django_user.groups.filter(name = groupname).exists():
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Note that groupname can also be the actual Django Group object.
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How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and
I've generated key pairs using PuTTYgen and been logging in using Pageant, so that I have to enter my pass-phrase only once when my system boots.
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