Android之URI
转于:
http://blog.csdn.net/lxgwm2008/article/details/8710955
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一、URI简介
URI包含如下几个部分:
content://usrname:password@com.google.com:80/person/10
1、红色部分:访问资源的命名机制
2、绿色部分:存放资源的主机名,或称为authority
3、蓝色部分:资源本省的名称,由路径表示
二、URI类
android的URI类提供了几个使用接口来处理一个URI路径
1、public static final Uri EMPTY
一个空的URI对象,相等于""
2、public abstract String getAuthority ()
获取URI的authority部分,即usrname:password@com.google.com:80
3、public abstract String getHost ()
获取URI的主机部分,即com.google.com
4、public abstract int getPort ()
获取URI的端口,即80
5、、public abstract String getScheme ()
获取URI的scheme,即content://
6、public abstract String getUserInfo ()
获取URI的用户信息,即usrname:password
三、UriMatcher类
android为URI提供了一个UriMatcher类,用来对URI进行各种匹配。其主要接口如下:
voidaddURI(String authority, String path, int code)
向该UriMatcher中添加一条匹配规则.authority如前所述;path为资源的路径,其中"*"可表示匹配任何字符,"#"表示匹配一个数字;code为当某一URI匹配该规则时,返回的匹配码
intmatch(Uri uri)
开始匹配一个URI,成功则返回前面设定的code,否则返回UriMatcher.NO_MATCH常量。
以下摘自android:
private static final int PEOPLE = 1;
private static final int PEOPLE_ID = 2;
private static final int PEOPLE_PHONES = 3;
private static final int PEOPLE_PHONES_ID = 4;
private static final int PEOPLE_CONTACTMETHODS = 7;
private static final int PEOPLE_CONTACTMETHODS_ID = 8;
private static final int DELETED_PEOPLE = 20;
private static final int PHONES = 9;
private static final int PHONES_ID = 10;
private static final int PHONES_FILTER = 14;
private static final int CONTACTMETHODS = 18;
private static final int CONTACTMETHODS_ID = 19;
private static final int CALLS = 11;
private static final int CALLS_ID = 12;
private static final int CALLS_FILTER = 15;
private static final UriMatcher sURIMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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);
}
四、ContentUris类 ContentUris类是android提供的又一个URI的工具类,其作用主要是操作使用"content://"的URI路径后面的ID部分。其主要接口如下: 1、static Uri.BuilderappendId(Uri.Builder builder, long id)
将一个id添加到URI的后面.
2、static longparseId(Uri contentUri)
获取URI后面的路径id.
3、static UriwithAppendedId(Uri contentUri, long id)
类似于appendId,同样是将id添加到URI的后面.
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