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How to center the content inside a linear layout?

I'm trying to center an ImageView inside a LinearLayout horizontally and vertically, but I just can't do it. The main reason why I'm not using a RelativeLayout for that is because I need the layout_weight (my Activity consists of four columns that should be equally divided, and also respon...
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top命令使用详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...交互式命令或者在个人定制文件中进行设定. top [-] [d delay] [p pid] [q] [c] [C] [S] [s] [i] [n iter] [b] p 仅监视进程给定的进程ID d 指定每两次屏幕信息刷新之间的时间间隔。当然用户可以使用s交互命令来改变之。 q 该选项将使top没有...
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How do you implement an async action delegate method?

I am learning the Web API stack and I am trying to encapsulate all data in the form of a "Result" object with parameters such as Success and ErrorCodes. ...
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Fastest method of screen capturing on Windows

I want to write a screencasting program for the Windows platform, but am unsure of how to capture the screen. The only method I'm aware of is to use GDI, but I'm curious whether there are other ways to go about this, and, if there are, which incurs the least overhead? Speed is a priority. ...
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Difference between doseq and for in Clojure

What's the difference between doseq and for in Clojure? What are some examples of when you would choose to use one over the other? ...
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SQL to determine minimum sequential days of access?

The following User History table contains one record for every day a given user has accessed a website (in a 24 hour UTC period). It has many thousands of records, but only one record per day per user. If the user has not accessed the website for that day, no record will be generated. ...
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Difference between Iterator and Listiterator?

We can use Iterator to traverse a Set or a List or a Map . But ListIterator can only be used to traverse a List , it can't traverse a Set . Why? ...
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What is a Proxy in Doctrine 2?

I just finished reading all the Doctrine 2 documentation, I started my own sandbox, I understood most of the principes, but there is still a question and I couldn't find any complete explanation in the doc. ...
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onNewIntent() lifecycle and registered listeners

I'm using a singleTop Activity to receive intents from a search-dialog via onNewIntent() . 2 Answers ...
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Perl flags -pe, -pi, -p, -w, -d, -i, -t?

I have seen lots of ways of running Perl code or scripts, with different flags. However, when I try to google for what each flag means, I mainly get results to generic Perl sites and no specific information regarding the flags or their use is found there. ...