UriMatcher Classe

Definição

[Android.Runtime.Register("android/content/UriMatcher", DoNotGenerateAcw=true)]
public class UriMatcher : Java.Lang.Object

[<Android.Runtime.Register("android/content/UriMatcher", DoNotGenerateAcw=true)>]
type UriMatcher = class
    inherit Object

Herança

Object

Object

UriMatcher

Atributos

RegisterAttribute

Comentários

Classe de utilitário para auxiliar na correspondência de URIs em provedores de conteúdo.

Para usar essa classe, crie uma árvore de UriMatcher objetos. Por exemplo:

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);
                }

A partir do nível android.os.Build.VERSION_CODES#JELLY_BEAN_MR2da API, os caminhos podem começar com uma barra à esquerda. Por exemplo:

sURIMatcher.addURI("contacts", "/people", PEOPLE);

Em seguida, quando você precisar corresponder a um URI, chame #match, fornecendo a URL que você recebeu. Você pode usar o resultado para criar uma consulta, retornar um tipo, inserir ou excluir uma linha ou o que precisar, sem duplicar toda a lógica if-else que você precisaria de outra forma. Por exemplo:

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;
                    }
                }

Em vez de:

public String getType(Uri url)
                {
                    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 (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;
                }

Java documentação para android.content.UriMatcher.

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