<data> | Android Developers  https://developer.android.com/guide/topics/manifest/data-element.html

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<data>

SYNTAX:

<data android:scheme="string"      android:host="string"      android:port="string"      android:path="string"      android:pathPattern="string"      android:pathPrefix="string"      android:mimeType="string" />

CONTAINED IN:

<intent-filter>

DESCRIPTION:

Adds a data specification to an intent filter. The specification can be just a data type (the mimeType attribute), just a URI, or both a data type and a URI. A URI is specified by separate attributes for each of its parts:

<scheme>://<host>:<port>[<path>|<pathPrefix>|<pathPattern>]

These attributes that specify the URL format are optional, but also mutually dependent:

• If a scheme is not specified for the intent filter, all the other URI attributes are ignored.
• If a host is not specified for the filter, the port attribute and all the path attributes are ignored.

All the <data> elements contained within the same <intent-filter> element contribute to the same filter. So, for example, the following filter specification,

<intent-filter . . . >    <data android:scheme="something" android:host="project.example.com" />    . . .</intent-filter>

is equivalent to this one:

<intent-filter . . . >    <data android:scheme="something" />    <data android:host="project.example.com" />    . . .</intent-filter>

You can place any number of <data> elements inside an <intent-filter> to give it multiple data options. None of its attributes have default values.

Information on how intent filters work, including the rules for how Intent objects are matched against filters, can be found in another document,Intents and Intent Filters. See also the Intent Filters section in the manifest file overview.

ATTRIBUTES:

android:scheme

The scheme part of a URI. This is the minimal essential attribute for specifying a URI; at least one scheme attribute must be set for the filter, or none of the other URI attributes are meaningful.

A scheme is specified without the trailing colon (for example, http, rather than http:).

If the filter has a data type set (the mimeType attribute) but no scheme, the content: and file: schemes are assumed.

Note: Scheme matching in the Android framework is case-sensitive, unlike the RFC. As a result, you should always specify schemes using lowercase letters.

android:host

The host part of a URI authority. This attribute is meaningless unless a scheme attribute is also specified for the filter. To match multiple subdomains, use an asterisk (*) to match zero or more characters in the host. For example, the host *.google.com matcheswww.google.com, .google.com, and developer.google.com.

The asterisk must be the first character of the host attribute. For example, the host google.co.* is invalid because the asterisk wildcard is not the first character.

Note: host name matching in the Android framework is case-sensitive, unlike the formal RFC. As a result, you should always specify host names using lowercase letters.

android:port

The port part of a URI authority. This attribute is meaningful only if the scheme and host attributes are also specified for the filter.

android:path 
android:pathPrefix 
android:pathPattern

The path part of a URI which must begin with a /. The path attribute specifies a complete path that is matched against the complete path in an Intent object. The pathPrefix attribute specifies a partial path that is matched against only the initial part of the path in the Intent object. The pathPattern attribute specifies a complete path that is matched against the complete path in the Intent object, but it can contain the following wildcards:

• An asterisk (‘*‘) matches a sequence of 0 to many occurrences of the immediately preceding character.
• A period followed by an asterisk (".*") matches any sequence of 0 to many characters.

Because ‘\‘ is used as an escape character when the string is read from XML (before it is parsed as a pattern), you will need to double-escape: For example, a literal ‘*‘ would be written as "\\*" and a literal ‘\‘ would be written as "\\\\". This is basically the same as what you would need to write if constructing the string in Java code.

For more information on these three types of patterns, see the descriptions of PATTERN_LITERAL, PATTERN_PREFIX, andPATTERN_SIMPLE_GLOB in the PatternMatcher class.

These attributes are meaningful only if the scheme and host attributes are also specified for the filter.

android:mimeType

A MIME media type, such as image/jpeg or audio/mpeg4-generic. The subtype can be the asterisk wildcard (*) to indicate that any subtype matches.

It‘s common for an intent filter to declare a <data> that includes only the android:mimeType attribute.

Note: MIME type matching in the Android framework is case-sensitive, unlike formal RFC MIME types. As a result, you should always specify MIME types using lowercase letters.

INTRODUCED IN:

API Level 1

SEE ALSO:

<action> 
<category>

w

体会“协议”

http://stackoverflow.com/questions/3469908/make-a-link-in-the-android-browser-start-up-my-app

http://stackoverflow.com/questions/2958701/launch-custom-android-application-from-android-browser

更新：通过浏览器直接打开Android应用程序 - Cundong‘s log  https://my.oschina.net/liucundong/blog/354029

Android实现通过浏览器点击链接打开本地应用（APP）并拿到浏览器传递的数据 - 被艺术搞，哥很享受！ - 博客频道 - CSDN.NET  http://blog.csdn.net/jiangwei0910410003/article/details/23940445

<a href="[scheme]://[host]/[path]?[query]">启动应用程序</a> 

各个项目含义如下所示：

scheme：判别启动的App。 ※详细后述

host：适当记述

path：传值时必须的key     ※没有也可以

query：获取值的Key和Value  ※没有也可以