Docs: Fixed an invalid initialization of ExampleProvider member in Content URI

patterns docs sample

Bug: 28679030
Change-Id: Ia8f30fa82dbbced9c177e39a61834f25d5b331b2

docs/html/guide/topics/providers/content-provider-creating.jd

@@ -409,25 +409,27 @@ page.title=Creating a Content Provider
 public class ExampleProvider extends ContentProvider {
 ...
     // Creates a UriMatcher object.
-    private static final UriMatcher sUriMatcher;
-...
-    /*
-     * The calls to addURI() go here, for all of the content URI patterns that the provider
-     * should recognize. For this snippet, only the calls for table 3 are shown.
-     */
-...
-    /*
-     * Sets the integer value for multiple rows in table 3 to 1. Notice that no wildcard is used
-     * in the path
-     */
-    sUriMatcher.addURI("com.example.app.provider", "table3", 1);
+    private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
 
-    /*
-     * Sets the code for a single row to 2. In this case, the "#" wildcard is
-     * used. "content://com.example.app.provider/table3/3" matches, but
-     * "content://com.example.app.provider/table3 doesn't.
-     */
-    sUriMatcher.addURI("com.example.app.provider", "table3/#", 2);
+    static {
+        /*
+         * The calls to addURI() go here, for all of the content URI patterns that the provider
+         * should recognize. For this snippet, only the calls for table 3 are shown.
+         */
+
+        /*
+         * Sets the integer value for multiple rows in table 3 to 1. Notice that no wildcard is used
+         * in the path
+         */
+        sUriMatcher.addURI("com.example.app.provider", "table3", 1);
+    
+        /*
+         * Sets the code for a single row to 2. In this case, the "#" wildcard is
+         * used. "content://com.example.app.provider/table3/3" matches, but
+         * "content://com.example.app.provider/table3 doesn't.
+         */
+        sUriMatcher.addURI("com.example.app.provider", "table3/#", 2);
+    }
 ...
     // Implements ContentProvider.query()
     public Cursor query(