1.Uri
通用资源标志符(Universal Resource Identifier, 简称"URI")。
Uri代表要操作的数据,Android上可用的每种资源 - 图像、视频片段等都可以用Uri来表示。
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URI一般由三部分组成:
访问资源的命名机制。<wbr></wbr>
存放资源的主机名。<wbr></wbr>
资源自身的名称,由路径表示。<wbr></wbr>
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Android的Uri由以下三部分组成: "content://"、数据的路径、标示ID(可选)
举些例子,如:<wbr></wbr>
所有联系人的Uri: content://contacts/people
某个联系人的Uri: content://contacts/people/5
所有图片Uri: content://media/external
某个图片的Uri:content://media/external/images/media/4
<wbr></wbr>
<wbr></wbr>
<wbr></wbr>
<wbr></wbr>
我们很经常需要解析Uri,并从Uri中获取数据。
Android系统提供了两个用于操作Uri的工具类,分别为UriMatcher 和ContentUris 。
虽然这两类不是非常重要,但是掌握它们的使用,会便于我们的开发工作。
下面就一起看一下这两个类的作用。
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<wbr></wbr>
2.UriMatcher
UriMatcher 类主要用于匹配Uri.
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使用方法如下。
首先第一步,初始化:
-
UriMatcher<wbr>matcher<wbr>=<wbr></wbr></wbr></wbr>new<wbr>UriMatcher(UriMatcher.NO_MATCH);<wbr><wbr></wbr></wbr></wbr>
<wbr><p>第二步注册需要的Uri:</p>
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<span><span>matcher.addURI(</span><span>"com.yfz.Lesson"</span><span>,<wbr></wbr></span><span>"people"</span><span>,<wbr>PEOPLE);<wbr><wbr></wbr></wbr></wbr></span></span>
</li>
<li>
<span>matcher.addURI(</span><span>"com.yfz.Lesson"</span><span>,<wbr></wbr></span><span>"person/#"</span><span>,<wbr>PEOPLE_ID);<wbr><wbr></wbr></wbr></wbr></span>
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<textarea style="DISPLAY: none" name="code" rows="15" cols="50">matcher.addURI("com.yfz.Lesson", "people", PEOPLE);
matcher.addURI("com.yfz.Lesson", "person/#", PEOPLE_ID);
</textarea><wbr><p><wbr></wbr></p>
<p>第三部,与已经注册的Uri进行匹配:</p>
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<span><span>Uri<wbr>uri<wbr>=<wbr>Uri.parse(</wbr></wbr></wbr></span><span>"content://"</span><span><wbr>+<wbr></wbr></wbr></span><span>"com.yfz.Lesson"</span><span><wbr>+<wbr></wbr></wbr></span><span>"/people"</span><span>);<wbr><wbr></wbr></wbr></span></span>
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<span>int</span><span><wbr>match<wbr>=<wbr>matcher.match(uri);<wbr><wbr></wbr></wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>switch</span><span><wbr>(match)<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>case</span><span><wbr>PEOPLE:<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>return</span><span><wbr></wbr></span><span>"vnd.android.cursor.dir/people"</span><span>;<wbr><wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>case</span><span><wbr>PEOPLE_ID:<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>return</span><span><wbr></wbr></span><span>"vnd.android.cursor.item/people"</span><span>;<wbr><wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>default</span><span>:<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>return</span><span><wbr></wbr></span><span>null</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
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<textarea style="DISPLAY: none" name="code" rows="15" cols="50">Uri uri = Uri.parse("content://" + "com.yfz.Lesson" + "/people");
int match = matcher.match(uri);
switch (match)
{
case PEOPLE:
return "vnd.android.cursor.dir/people";
case PEOPLE_ID:
return "vnd.android.cursor.item/people";
default:
return null;
}
</textarea><wbr><p>match方法匹配后会返回一个匹配码Code,即在使用注册方法addURI时传入的第三个参数。</p>
<p><wbr></wbr></p>
<p>上述方法会返回"vnd.android.cursor.dir/person".</p>
<p><wbr></wbr></p>
<p><span style="color:#0000ff">总结:<wbr></wbr></span></p>
<p><span style="color:#0000ff">--常量 UriMatcher.NO_MATCH 表示不匹配任何路径的返回码</span></p>
<p><span style="color:#0000ff">--# 号为通配符</span></p>
<p><span style="color:#0000ff">--* 号为任意字符</span></p>
<p><wbr></wbr></p>
<p><wbr></wbr></p>
<p>另外说一下,官方SDK说明中关于Uri的注册是这样写的:</p>
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<span><span>private</span><span><wbr></wbr></span><span>static</span><span><wbr></wbr></span><span>final</span><span><wbr>UriMatcher<wbr>sURIMatcher<wbr>=<wbr></wbr></wbr></wbr></wbr></span><span>new</span><span><wbr>UriMatcher();<wbr><wbr></wbr></wbr></wbr></span></span>
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<span><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></span><span>static</span><span><wbr><wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/people"</span><span>,<wbr>PEOPLE);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/people/#"</span><span>,<wbr>PEOPLE_ID);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/people/#/phones"</span><span>,<wbr>PEOPLE_PHONES);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/people/#/phones/#"</span><span>,<wbr>PEOPLE_PHONES_ID);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/people/#/contact_methods"</span><span>,<wbr>PEOPLE_CONTACTMETHODS);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/people/#/contact_methods/#"</span><span>,<wbr>PEOPLE_CONTACTMETHODS_ID);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/deleted_people"</span><span>,<wbr>DELETED_PEOPLE);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/phones"</span><span>,<wbr>PHONES);<wbr><wbr></wbr></wbr></wbr></span>
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<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/phones/filter/*"</span><span>,<wbr>PHONES_FILTER);<wbr><wbr></wbr></wbr></wbr></span>
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<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/phones/#"</span><span>,<wbr>PHONES_ID);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/contact_methods"</span><span>,<wbr>CONTACTMETHODS);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"contacts"</span><span>,<wbr></wbr></span><span>"/contact_methods/#"</span><span>,<wbr>CONTACTMETHODS_ID);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"call_log"</span><span>,<wbr></wbr></span><span>"/calls"</span><span>,<wbr>CALLS);<wbr><wbr></wbr></wbr></wbr></span>
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<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"call_log"</span><span>,<wbr></wbr></span><span>"/calls/filter/*"</span><span>,<wbr>CALLS_FILTER);<wbr><wbr></wbr></wbr></wbr></span>
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<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"call_log"</span><span>,<wbr></wbr></span><span>"/calls/#"</span><span>,<wbr>CALLS_ID);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr>}<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
</ol>
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<textarea style="DISPLAY: none" name="code" rows="15" cols="50">private static final UriMatcher sURIMatcher = new UriMatcher();
static
{
sURIMatcher.addURI("contacts", "/people", PEOPLE);
sURIMatcher.addURI("contacts", "/people/#", PEOPLE_ID);
sURIMatcher.addURI("contacts", "/people/#/phones", PEOPLE_PHONES);
sURIMatcher.addURI("contacts", "/people/#/phones/#", PEOPLE_PHONES_ID);
sURIMatcher.addURI("contacts", "/people/#/contact_methods", PEOPLE_CONTACTMETHODS);
sURIMatcher.addURI("contacts", "/people/#/contact_methods/#", PEOPLE_CONTACTMETHODS_ID);
sURIMatcher.addURI("contacts", "/deleted_people", DELETED_PEOPLE);
sURIMatcher.addURI("contacts", "/phones", PHONES);
sURIMatcher.addURI("contacts", "/phones/filter/*", PHONES_FILTER);
sURIMatcher.addURI("contacts", "/phones/#", PHONES_ID);
sURIMatcher.addURI("contacts", "/contact_methods", CONTACTMETHODS);
sURIMatcher.addURI("contacts", "/contact_methods/#", CONTACTMETHODS_ID);
sURIMatcher.addURI("call_log", "/calls", CALLS);
sURIMatcher.addURI("call_log", "/calls/filter/*", CALLS_FILTER);
sURIMatcher.addURI("call_log", "/calls/#", CALLS_ID);
}
</textarea><wbr><p><wbr></wbr></p>
<p>这个说明估计已经是Google官方没有更新,首先是初始化方法,没有传参,那么现在初始化时,实际是必须传参的。可以看一下Android2.2的源码,无参数的构造方法已经是private的了。</p>
<p>另外就是addURI这个方法,第二个参数开始时不需要"/", 否则是无法匹配成功的。</p>
<p><wbr></wbr></p>
<p><strong><span style="color:#ff0000">3.ContentUris</span></strong></p>
<p>ContentUris 类用于获取Uri路径后面的ID部分</p>
<p>1)为路径加上ID: withAppendedId(uri, id)</p>
<p>比如有这样一个Uri</p>
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<a title="view plain" href="http://blog.sina.com.cn/s/blog_821e2bb10100spxv.html#">view plain</a><a title="copy to clipboard" href="http://blog.sina.com.cn/s/blog_821e2bb10100spxv.html#">copy to clipboard</a><a title="print" href="http://blog.sina.com.cn/s/blog_821e2bb10100spxv.html#">print</a><a title="?" href="http://blog.sina.com.cn/s/blog_821e2bb10100spxv.html#">?</a>
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<ol><li>
<span><span>Uri<wbr>uri<wbr>=<wbr>Uri.parse(</wbr></wbr></wbr></span><span>"content://com.yfz.Lesson/people"</span><span>)<wbr><wbr></wbr></wbr></span></span>
</li></ol>
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<textarea style="DISPLAY: none" name="code" rows="15" cols="50">Uri uri = Uri.parse("content://com.yfz.Lesson/people")
</textarea><wbr><p>通过withAppendedId方法,为该Uri加上ID</p>
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</div>
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<ol><li>
<span><span>Uri<wbr>resultUri<wbr>=<wbr>ContentUris.withAppendedId(uri,<wbr></wbr></wbr></wbr></wbr></span><span>10</span><span>);<wbr><wbr></wbr></wbr></span></span>
</li></ol>
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<textarea style="DISPLAY: none" name="code" rows="15" cols="50">Uri resultUri = ContentUris.withAppendedId(uri, 10);
</textarea><wbr><p>最后resultUri为: content://com.yfz.Lesson/people/10</p>
<p><wbr></wbr></p>
<p>2)从路径中获取ID: parseId(uri)</p>
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<div>
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<li>
<span><span>Uri<wbr>uri<wbr>=<wbr>Uri.parse(</wbr></wbr></wbr></span><span>"content://com.yfz.Lesson/people/10"</span><span>)<wbr><wbr></wbr></wbr></span></span>
</li>
<li>
<span>long</span><span><wbr>personid<wbr>=<wbr>ContentUris.parseId(uri);<wbr><wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
</ol>
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<textarea style="DISPLAY: none" name="code" rows="15" cols="50">Uri uri = Uri.parse("content://com.yfz.Lesson/people/10")
long personid = ContentUris.parseId(uri);
</textarea><wbr><p>最后personid 为 :10</p>
<p><wbr></wbr></p>
<p>附上实验的代码:</p>
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<ol>
<li>
<span><span>package</span><span><wbr>com.yfz;<wbr><wbr></wbr></wbr></wbr></span></span> </li>
<li>
<span>import</span><span><wbr>com.yfz.log.Logger;<wbr><wbr></wbr></wbr></wbr></span> </li>
<li>
<span>import</span><span><wbr>android.app.Activity;<wbr><wbr></wbr></wbr></wbr></span> </li>
<li>
<span>import</span><span><wbr>android.content.ContentUris;<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span>import</span><span><wbr>android.content.UriMatcher;<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span>import</span><span><wbr>android.net.Uri;<wbr><wbr></wbr></wbr></wbr></span> </li>
<li>
<span>import</span><span><wbr>android.os.Bundle;<wbr><wbr></wbr></wbr></wbr></span> </li>
<li>
<span>public</span><span><wbr></wbr></span><span>class</span><span><wbr>Lesson_14<wbr></wbr></wbr></span><span>extends</span><span><wbr>Activity<wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>private</span><span><wbr></wbr></span><span>static</span><span><wbr></wbr></span><span>final</span><span><wbr>String<wbr>AUTHORITY<wbr>=<wbr></wbr></wbr></wbr></wbr></span><span>"com.yfz.Lesson"</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>private</span><span><wbr></wbr></span><span>static</span><span><wbr></wbr></span><span>final</span><span><wbr></wbr></span><span>int</span><span><wbr>PEOPLE<wbr>=<wbr></wbr></wbr></wbr></span><span>1</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>private</span><span><wbr></wbr></span><span>static</span><span><wbr></wbr></span><span>final</span><span><wbr></wbr></span><span>int</span><span><wbr>PEOPLE_ID<wbr>=<wbr></wbr></wbr></wbr></span><span>2</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>//NO_MATCH表示不匹配任何路径的返回码</span>
<span><wbr><wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>private</span><span><wbr></wbr></span><span>static</span><span><wbr></wbr></span><span>final</span><span><wbr>UriMatcher<wbr>sURIMatcher<wbr>=<wbr></wbr></wbr></wbr></wbr></span><span>new</span><span><wbr>UriMatcher(UriMatcher.NO_MATCH);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>static</span><span><wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(AUTHORITY,<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"people"</span><span>,<wbr>PEOPLE);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>//这里的#代表匹配任意数字,另外还可以用*来匹配任意文本</span>
<span><wbr><wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>sURIMatcher.addURI(AUTHORITY,<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"people/#"</span><span>,<wbr>PEOPLE_ID);<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>@Override</span><span><wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>protected</span><span><wbr></wbr></span><span>void</span><span><wbr>onCreate(Bundle<wbr>savedInstanceState)<wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>super</span><span>.onCreate(savedInstanceState);<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.d(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"------<wbr>Start<wbr>Activity<wbr>!!!<wbr>------"</wbr></wbr></wbr></wbr></span><span>);<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Uri<wbr>uri1<wbr>=<wbr>Uri.parse(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"content://"</span><span><wbr>+<wbr>AUTHORITY<wbr>+<wbr></wbr></wbr></wbr></wbr></span><span>"/people"</span><span>);<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.e(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"Uri:"</span><span><wbr>+<wbr>uri1);<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.d(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"Match<wbr>1"</wbr></span><span><wbr>+<wbr>getType(uri1));<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Uri<wbr>uri2<wbr>=<wbr>Uri.parse(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"content://"</span><span><wbr>+<wbr>AUTHORITY<wbr>+<wbr></wbr></wbr></wbr></wbr></span><span>"/people"</span><span><wbr>+<wbr></wbr></wbr></span><span>"/2"</span><span>);<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.e(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"Uri:"</span><span><wbr>+<wbr>uri2);<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.d(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"Match<wbr>2"</wbr></span><span><wbr>+<wbr>getType(uri2));<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>//拼接Uri</span>
<span><wbr><wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Uri<wbr>cUri<wbr>=<wbr>ContentUris.withAppendedId(uri1,<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>15</span><span>);<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.e(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"Uri:"</span><span><wbr>+<wbr>cUri);<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>//获取ID</span>
<span><wbr><wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>long</span><span><wbr>id<wbr>=<wbr>ContentUris.parseId(cUri);<wbr><wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Logger.d(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>"Uri<wbr>ID:<wbr>"</wbr></wbr></span><span><wbr>+<wbr>id);<wbr><wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>private</span><span><wbr>String<wbr>getType(Uri<wbr>uri)<wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>int</span><span><wbr>match<wbr>=<wbr>sURIMatcher.match(uri);<wbr><wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>switch</span><span><wbr>(match)<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>{<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>case</span><span><wbr>PEOPLE:<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>return</span><span><wbr></wbr></span><span>"vnd.android.cursor.dir/person"</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>case</span><span><wbr>PEOPLE_ID:<wbr><wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>return</span><span><wbr></wbr></span><span>"vnd.android.cursor.item/person"</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>default</span><span>:<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span><span>return</span><span><wbr></wbr></span><span>null</span><span>;<wbr><wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span>
</li>
<li>
<span><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></span> </li>
<li>
<span>}<wbr><wbr></wbr></wbr></span> </li>
</ol>
</div>
<textarea style="DISPLAY: none" name="code" rows="15" cols="50">package com.yfz;
import com.yfz.log.Logger;
import android.app.Activity;
import android.content.ContentUris;
import android.content.UriMatcher;
import android.net.Uri;
import android.os.Bundle;
public class Lesson_14 extends Activity {
private static final String AUTHORITY = "com.yfz.Lesson";
private static final int PEOPLE = 1;
private static final int PEOPLE_ID = 2;
//NO_MATCH表示不匹配任何路径的返回码
private static final UriMatcher sURIMatcher = new UriMatcher(UriMatcher.NO_MATCH);
static
{
sURIMatcher.addURI(AUTHORITY, "people", PEOPLE);
//这里的#代表匹配任意数字,另外还可以用*来匹配任意文本
sURIMatcher.addURI(AUTHORITY, "people/#", PEOPLE_ID);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Logger.d("------ Start Activity !!! ------");
Uri uri1 = Uri.parse("content://" + AUTHORITY + "/people");
Logger.e("Uri:" + uri1);
Logger.d("Match 1" + getType(uri1));
Uri uri2 = Uri.parse("content://" + AUTHORITY + "/people" + "/2");
Logger.e("Uri:" + uri2);
Logger.d("Match 2" + getType(uri2));
//拼接Uri
Uri cUri = ContentUris.withAppendedId(uri1, 15);
Logger.e("Uri:" + cUri);
//获取ID
long id = ContentUris.parseId(cUri);
Logger.d("Uri ID: " + id);
}
private String getType(Uri uri) {
int match = sURIMatcher.match(uri);
switch (match)
{
case PEOPLE:
return "vnd.android.cursor.dir/person";
case PEOPLE_ID:
return "vnd.android.cursor.item/person";
default:
return null;
}
}
}
</textarea><wbr><p><wbr></wbr></p>
<p>好了,就讲这么多。</p>
<p><wbr></wbr></p>
<p><strong>附:Android Uri命名格式:</strong></p>
<p>ContentProvider进行数据交互时就需要用到URI。为了让客户端程序能够使用你的数据,你必须要定义一个公开的URI,它由一些固定格式的文字组成,可以分成下面几个部分:</p>
<p><strong>content://</strong></p>
<p>一个标准的URI前缀,它用来指示Android必须从ContentProvider中挑出一个来处理这个URI。</p>
<p><strong>authority</strong></p>
<p>一个唯一的标识符,标示这个URI需要查找的ContentProvider是由哪个组织开发的,一般用跟java包命名规范相似的方式来署名这个开发组织。如果是Android内置的provider,则这个authority可以省略掉,否则authority是必须的,Google建议使用用户自定义的继承ContentProvider的类的全名来作为,这个ContentProvider所要处理的URI的authority</p>
<p><strong>path(路径)</strong></p>
<p>ContentProvider根据这个路径信息来判断要返回什么类型的数据,所以这个后缀路径可以自由定义,但是有一些条件限制:</p>
<p>如果一个ContentProvider能查询返回很多种不同类型的数据,URI后缀要设置不同类型的数据所对应不同的URI后缀如内置的Contact ContentProvider就是用来处理名片夹,它可以返回很多种类型的数据:联系人、电话、联系方式等。所以对应这些不同类型的数据就有不同的URI后缀匹配:</p>
<div>
<div>
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr>
<td>
<div>1</div>
</td>
<td>
<div>
<div><code>content://contacts/people/1</code></div>
</div>
</td>
</tr></tbody></table>
</div>
</div>
<p>上面是返回一个人员</p>
<div>
<div>
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr>
<td>
<div>1</div>
</td>
<td>
<div>
<div><code>content://contacts/people/1/phone/3</code></div>
</div>
</td>
</tr></tbody></table>
</div>
</div>
<p>返回一个电话号码。</p>
<p>而且我们要为不同的数据类型设置不同的MIME类型,第一个MIME类型是:vnd.android.cursor.item/person第二个MIME类型是:vnd.android.cursor.item/phone。</p>
<p>同时ContentProvider不仅可以返回单条数据,也可能以目录的形式返回多条数据。以上面2个URI来说,后缀的结尾都是数字,这表示查询对应某条记录,所以返回的数据是单条的,而如果是查询目录的形式就要去掉后面的数字如:</p>
<div>
<div>
<table cellspacing="0" cellpadding="0" border="0"><tbody><tr>
<td>
<div>1</div>
<div>2</div>
</td>
<td>
<div>
<div><code>content://contacts/people/1/phone</code></div>
<div><code>content://contacts/people</code></div>
</div>
</td>
</tr></tbody></table>
</div>
</div>
<p>上面就是目录形式,对应他们的MIME类型也不同,所以我们将单条的MIME类型中的item改为dir,所以MIME类型是:vnd.android.cursor.dir/phone和vnd.android.cursor.dir/person。</p>
<p><a href="http://www.android777.com/wp-content/uploads/2011/03/content_uri.png"><img title="content_uri" height="80" alt="" src="http://www.android777.com/wp-content/uploads/2011/03/content_uri.png" width="528"></a></p>
<p>A: 标准前缀,表达的意思是使用ContentProvider来处理信息。</p>
<p>B: authority</p>
<p>C: 后缀1,一般用来表示请求需要获取的是哪种类型的数据(确定MIME类型的功能)。</p>
<p>D:定位记录。确定对应类型的数据中的哪条记录。</p>
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