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使用Activity启动器组件 · App Inventor 2 中文网
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启动相机
启动网络搜索
使用预先指定的消息启动邮件程序
显示某个位置的地图
播放在线视频
选择联系人
启动其他外部应用程序
了解如何设置 ActivityStarter 属性
在应用程序之间传...
How can I give eclipse more memory than 512M?
...e's that section on my Linux box:
-vmargs
-Dosgi.requiredJavaVersion=1.5
-XX:MaxPermSize=512m
-Xms512m
-Xmx1024m
And here's that section on my Windows box:
-vmargs
-Xms256m
-Xmx1024m
But, I've failed at setting it higher than 1024 megs. If anybody knows how to make that work, I'd love to know....
微博为什么限制140字(附短信70字限制考) - 闲聊区 - 清泛IT社区，为创新赋能！
...思。当时Hellebrand正在参与一个允许手机发送及显示文字消息的标准制定计划，他们考虑到无线网络的带宽限制，消息越短越好。最终，Hillebrand坚持认为160字是最好的长度限制，短信长度的限制也由此而来。关于160字的限制，洛...
Java Garbage Collection Log messages
...
I just wanted to mention that one can get the detailed GC log with the
-XX:+PrintGCDetails
parameter. Then you see the PSYoungGen or PSPermGen output like in the answer.
Also -Xloggc:gc.log seems to generate the same output like -verbose:gc but you can specify an output file in the first.
Ex...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
...思。当时Hellebrand正在参与一个允许手机发送及显示文字消息的标准制定计划，他们考虑到无线网络的带宽限制，消息越短越好。最终，Hillebrand坚持认为160字是最好的长度限制，短信长度的限制也由此而来。
关于160字的限制，...
What's the difference between UTF-8 and UTF-8 without BOM?
...anness of JSON, examining the first four bytes for the NUL byte:
00 00 00 xx - UTF-32BE
00 xx 00 xx - UTF-16BE
xx 00 00 00 - UTF-32LE
xx 00 xx 00 - UTF-16LE
xx xx xx xx - UTF-8
Now, if the file starts with BOM it will look like this:
00 00 FE FF - UTF-32BE
FE FF 00 xx - UTF-16BE
FF FE 00 00 - UT...
Split a string by another string in C#
... a string you'll have to use the string array overload.
string data = "THExxQUICKxxBROWNxxFOX";
return data.Split(new string[] { "xx" }, StringSplitOptions.None);
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Resizing an image in an HTML5 canvas
....PI;
if (Math.abs(x) < 1e-16)
return 1;
var xx = x / lobes;
return Math.sin(x) * Math.sin(xx) / x / xx;
};
}
// elem: canvas element, img: image element, sx: scaled width, lobes: kernel radius
function thumbnailer(elem, img, sx, lobes) {
this.canvas = ...
REST API error return good practices [closed]
...n-http-status-code.html
An excerpt from the article:
Where to start:
2XX/3XX:
4XX:
5XX:
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400 BAD request HTTP error code meaning?
...ition.
Rules are as following:
If request was successful, then return 2xx code (3xx for redirect). If there was an internal logic error on a server, then return 5xx. If there is anything wrong in client request, then return 4xx code.
Look through available response code from selected category. I...