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Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，WhatsApp的Push消息很不及时，体验非常差。
3. GCM研究
3.1 GCM特点
a）Android2.2以下的手机不支持GCM，2.2到3.0需要安装Google Store并设置Google帐号，4.04及以上版本不需要设置帐号也能支持。
b）GCM只传递数据（可以传递小于4kb的数...
Pure JavaScript Send POST Data Without a Form
...:
Object
Console log (firefox):
GET
http://XXXXX:8000/hello.html [HTTP/1.0 200 OK 0ms]
POST
XHR
http://XXXXX:8000/postman [HTTP/1.0 200 OK 0ms]
HELLO hello.html:13:3
{"req": {"value": "value"}} hello.html:14:3
Object { req: Object }
Console log (Edge):
HTML1300: Navigation occurred.
hello.h...
Generate Java classes from .XSD files…?
... Listing 3 item.xml file is created. It looks like this:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns1:item ns1:id="2" xmlns:ns1="http://blogs.sun.com/teera/ns/item">
<ns1:itemName>Foo</ns1:itemName>
<ns1:price>200</ns1:price>
</ns1:item>
...
What's the difference between “version number” in iTunes Connect, “bundle version”, “bundle version
...
I recently submitted a build with CFBundleVersion with "1.0.2 RC3" and it bounced with error message: "The bundle is invalid. The key CFBundleVersion in the Info.plist file must be a period-separated list of non-negative integers." I think the nn.n.nxnnn is the correct format to u...
How to create standard Borderless buttons (like in the design guideline mentioned)?
...like this:
res/drawable/selector_transparent_button.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
android:exitFadeDuration="@android:integer/config_shortAnimTime">
<item android:state_pressed="true"
...
Calculate the median of a billion numbers
...
Just tried on an Intel i5-4200M @3.1 GHz (4 cores). According to the time command applied to the whole pipeline, it took real=36m24s ("wall clock time"), user=113m15s ("parallel time", all cores added). The longest command, far ahead the others, was sort, e...
What are all the valid self-closing elements in XHTML (as implemented by the major browsers)?
...sue: the intention was to allow old
(HTML-only) browsers to accept XHTML 1.0 documents by following the
guidelines, and serving them as text/html. Therefore, documents served as
text/html should be treated as HTML and not as XHTML.
It's a very common pitfall, because W3C Validator largely ig...
is there a css hack for safari only NOT chrome?
...or:#0000FF;
background-color:#CCCCCC;
}
}}
One for Safari 11.0:
/* Safari 11.0 (not 11.1) */
html >> * .safari_only {
color:#0000FF;
background-color:#CCCCCC;
}
One for Safari 10.0:
/* Safari 10.0 (not 10.1) */
_::-webkit-:host:not(:root:root), .safari_only {
colo...
Android Studio with Google Play Services
...n 8
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
dependencies {
compile 'com.android.support:appcompat-v7:+'
compile 'com.google.android.gms:play-services:4.0.+'
}
Step 3:
android.manifest.xml
<uses-sdk
android:minSdkVersion="8" />
...
What's the difference between a Future and a Promise?
...s that the client cannot set the value of the future.
Both Spring and EJB 3.1 have an AsyncResult class, which is similar to the Scala/C++ promises. AsyncResult does implement Future but this is not the real future: asynchronous methods in Spring/EJB return a different, read-only Future object thro...