Fixes Issue 7907 in the public bugs database (http://code.google.com/p/android/issues/detail?id=7907).

The Javadoc comment for class `android.content.UriMatcher` had four issues:
1. The example calls to `addURI` should not be using a leading forward slash in
   the path parameter (reported by Ester Ytterbrink).
2. The sample code to construct a `UriMatcher` was incorrect because the
   `UriMatcher` constructor takes a parameter (reported by Ross Light).
3. The code example for using `match` was incorrect because it showed two
   parameters being passed, when `match` only takes one (reported by
   Ross Light).
4. The sample `getType` implementations were incorrect because `getType` takes
   a `Uri` object, not an array of `String`s.

Change-Id: I560bff6f021c13cabf736f40ff0f47a205074291

Author: dtrebbien

core/java/android/content/UriMatcher.java

@@ -25,8 +25,8 @@
 /**
 Utility class to aid in matching URIs in content providers.
 
-<p>To use this class, build up a tree of UriMatcher objects.
-Typically, it looks something like this:
+<p>To use this class, build up a tree of <code>UriMatcher</code> objects.
+For example:
 <pre>
     private static final int PEOPLE = 1;
     private static final int PEOPLE_ID = 2;
@@ -48,36 +48,35 @@
     private static final int CALLS_ID = 12;
     private static final int CALLS_FILTER = 15;
 
-    private static final UriMatcher sURIMatcher = new UriMatcher();
+    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);
+        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);
     }
 </pre>
-<p>Then when you need to match match against a URI, call {@link #match}, providing
-the tokenized url you've been given, and the value you want if there isn't
-a match.  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 you'd otherwise need.  Like this:
+<p>Then when you need to match against a URI, call {@link #match}, 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:
 <pre>
-    public String getType(String[] url)
+    public String getType(Uri url)
     {
-        int match = sURIMatcher.match(url, NO_MATCH);
+        int match = sURIMatcher.match(url);
         switch (match)
         {
             case PEOPLE:
@@ -93,19 +92,20 @@ public String getType(String[] url)
         }
     }
 </pre>
-instead of
+instead of:
 <pre>
-    public String getType(String[] url)
+    public String getType(Uri url)
     {
-        if (url.length >= 2) {
-            if (url[1].equals("people")) {
-                if (url.length == 2) {
+        List<String> pathSegments = url.getPathSegments();
+        if (pathSegments.size() >= 2) {
+            if ("people".equals(pathSegments.get(1))) {
+                if (pathSegments.size() == 2) {
                     return "vnd.android.cursor.dir/person";
-                } else if (url.length == 3) {
+                } else if (pathSegments.size() == 3) {
                     return "vnd.android.cursor.item/person";
 ... snip ...
                     return "vnd.android.cursor.dir/snail-mail";
-                } else if (url.length == 3) {
+                } else if (pathSegments.size() == 3) {
                     return "vnd.android.cursor.item/snail-mail";
                 }
             }