public class UriMatcher extends Object
To use this class, build up a tree of UriMatcher
objects.
For example:
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); }
Then when you need to match against a URI, call match(android.net.Uri)
, providing
the URL that you have been given. You can use the result to build a query,
return a type, insert or delete a row, or whatever you need, without duplicating
all of the if-else logic that you would otherwise need. For example:
public String getType(Uri url) { int match = sURIMatcher.match(url); switch (match) { case PEOPLE: return "vnd.android.cursor.dir/person"; case PEOPLE_ID: return "vnd.android.cursor.item/person"; ... snip ... return "vnd.android.cursor.dir/snail-mail"; case PEOPLE_ADDRESS_ID: return "vnd.android.cursor.item/snail-mail"; default: return null; } }instead of:
public String getType(Uri url) { ListpathSegments = url.getPathSegments(); if (pathSegments.size() >= 2) { if ("people".equals(pathSegments.get(1))) { if (pathSegments.size() == 2) { return "vnd.android.cursor.dir/person"; } else if (pathSegments.size() == 3) { return "vnd.android.cursor.item/person"; ... snip ... return "vnd.android.cursor.dir/snail-mail"; } else if (pathSegments.size() == 3) { return "vnd.android.cursor.item/snail-mail"; } } } return null; }
Modifier and Type | Field and Description |
---|---|
static int |
NO_MATCH |
Constructor and Description |
---|
UriMatcher(int code)
Creates the root node of the URI tree.
|
public static final int NO_MATCH
public UriMatcher(int code)
code
- the code to match for the root URIpublic void addURI(String authority, String path, int code)
authority
- the authority to matchpath
- the path to match. * may be used as a wild card for
any text, and # may be used as a wild card for numbers.code
- the code that is returned when a URI is matched
against the given components. Must be positive.public int match(Uri uri)
uri
- The url whose path we will match against.