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Retrofit2ͷΈ
Androidݚڀ&ൃදձ #2
2019/10/26
ʙΦϦδφϧConverterΛ࡞ͬͯΈΔʙ
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• Տຊ ହ(͔Θͱ ͔ͨ͢)
• ॴଐɿגࣜձࣾ tech vein
(େࡕࢢதԝ۠ຊொ)
• ϞόΠϧΞϓϦΤϯδχΞ
(AndroidଟΊɺiOSŧŔŕŪũƄŝſ)
• GitHub: kwmt ɺtwitter: kwmt27
• Google I/O2018 ॳࢀՃ
• Ԭग़
• ΫϥϑτϏʔϧ͖
2
ࣗݾհ
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• Squareࣾ
• JavaϥΠϒϥϦ
• HTTPΫϥΠΞϯτ
• Android or JavaͰॻ͔ΕͨαʔόʔͰಈ͘
Retrofitͱ
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interface ApiService {
}
RetrofitͷΞΠσΞ
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interface ApiService {
}
RetrofitͷΞΠσΞ
class HttpGitHubService : ApiService {
// …
}
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interface ApiService {
}
RetrofitͷΞΠσΞ
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No content
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implementation 'com.squareup.retrofit2:retrofit:2.6.2'
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interface GitHubService {
fun listRepos(user: String): List
}
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interface GitHubService {
fun listRepos(user: String): List
}
data class Repo(val name: String)
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interface GitHubService {
fun listRepos(user: String): List
}
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interface GitHubService {
@GET("users/{user}/repos")
fun listRepos(user: String): List
}
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interface GitHubService {
@GET("users/{user}/repos")
fun listRepos(@Path("user") user: String): List
}
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interface GitHubService {
@GET("users/{user}/repos")
fun listRepos(@Path("user") user: String): Call>
}
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val retrofit: Retrofit = Retrofit.Builder()
.baseUrl("https://api.github.com/")
.build()
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val retrofit: Retrofit = Retrofit.Builder()
.baseUrl("https://api.github.com/")
.build()
val gitHubService: GitHubService
= retrofit.create(GitHubService::class.java)
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val repos: Call> = gitHubService.listRepos("kwmt")
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val repos: Call> = gitHubService.listRepos("kwmt")
repos.enqueue(object : retrofit2.Callback> {
override fun onFailure(call: Call>, t: Throwable) {
Log.d("GitHubSample", t.message)
}
override fun onResponse(
call: Call>, response: Response>) {
Log.d("GitHubSample", response.toString())
}
})
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Caused by: java.lang.IllegalArgumentException:
Could not locate ResponseBody converter for
java.util.List.
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Ϋϥογϡ͠·͢ɻ
Caused by: java.lang.IllegalArgumentException:
Could not locate ResponseBody converter for
java.util.List.
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Ϋϥογϡ͠·͢ɻ
Caused by: java.lang.IllegalArgumentException:
Could not locate ResponseBody converter for
java.util.List.
ͳΜ͔ConverterབྷΈͰౖΒΕͯΔ༧͖ͭ·͕͢ɺ
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Ϋϥογϡ͠·͢ɻ
Caused by: java.lang.IllegalArgumentException:
Could not locate ResponseBody converter for
java.util.List.
val repos: Call> = gitHubService.listRepos("kwmt")
ͳΜ͔ConverterབྷΈͰౖΒΕͯΔ༧͖ͭ·͕͢ɺ
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Ϋϥογϡ͠·͢ɻ
Caused by: java.lang.IllegalArgumentException:
Could not locate ResponseBody converter for
java.util.List.
val repos: Call> = gitHubService.listRepos("kwmt")
͜͜ͰΫϥογϡ͍ͯ͠ΔΑ͏ͳͷͰɺਂ͘ݟͯΈ·͢ɻ
ͳΜ͔ConverterབྷΈͰౖΒΕͯΔ༧͖ͭ·͕͢ɺ
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retrofit.create(GitHubService::class.java)
public T create(final Class service) {
ɹ// লུ
return (T) Proxy.newProxyInstance(
service.getClassLoader(),
new Class[] { service },
new InvocationHandler() {
@Override public @Nullable
Object invoke(Object proxy,
Method method,
@Nullable Object[] args) throws Throwable {
ɹɹɹɹɹ // লུ
return loadServiceMethod(method)
.invoke(args != null ? args : emptyArgs);
}
});
}
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retrofit.create(GitHubService::class.java)
public T create(final Class service) {
ɹ// লུ
return (T) Proxy.newProxyInstance(
service.getClassLoader(),
new Class[] { service },
new InvocationHandler() {
@Override public @Nullable
Object invoke(Object proxy,
Method method,
@Nullable Object[] args) throws Throwable {
ɹɹɹɹɹ // লུ
return loadServiceMethod(method)
.invoke(args != null ? args : emptyArgs);
}
});
}
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retrofit.create(GitHubService::class.java)
public T create(final Class service) {
ɹ// লུ
return (T) Proxy.newProxyInstance(
service.getClassLoader(),
new Class[] { service },
new InvocationHandler() {
@Override public @Nullable
Object invoke(Object proxy,
Method method,
@Nullable Object[] args) throws Throwable {
ɹɹɹɹɹ // লུ
return loadServiceMethod(method)
.invoke(args != null ? args : emptyArgs);
}
});
}
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if (annotation instanceof DELETE) {
parseHttpMethodAndPath("DELETE", ((DELETE) annotation).value(),
false);
} else if (annotation instanceof GET) {
parseHttpMethodAndPath("GET", ((GET) annotation).value(), false);
} else if (annotation instanceof HEAD) {
parseHttpMethodAndPath("HEAD", ((HEAD) annotation).value(), false);
} else if (annotation instanceof PATCH) {
parseHttpMethodAndPath("PATCH", ((PATCH) annotation).value(), true);
} else if (annotation instanceof POST) {
parseHttpMethodAndPath("POST", ((POST) annotation).value(), true);
} else if (annotation instanceof PUT) {
parseHttpMethodAndPath("PUT", ((PUT) annotation).value(), true);
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if (annotation instanceof DELETE) {
parseHttpMethodAndPath("DELETE", ((DELETE) annotation).value(),
false);
} else if (annotation instanceof GET) {
parseHttpMethodAndPath("GET", ((GET) annotation).value(), false);
} else if (annotation instanceof HEAD) {
parseHttpMethodAndPath("HEAD", ((HEAD) annotation).value(), false);
} else if (annotation instanceof PATCH) {
parseHttpMethodAndPath("PATCH", ((PATCH) annotation).value(), true);
} else if (annotation instanceof POST) {
parseHttpMethodAndPath("POST", ((POST) annotation).value(), true);
} else if (annotation instanceof PUT) {
parseHttpMethodAndPath("PUT", ((PUT) annotation).value(), true);
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if (annotation instanceof DELETE) {
parseHttpMethodAndPath("DELETE", ((DELETE) annotation).value(),
false);
} else if (annotation instanceof GET) {
parseHttpMethodAndPath("GET", ((GET) annotation).value(), false);
} else if (annotation instanceof HEAD) {
parseHttpMethodAndPath("HEAD", ((HEAD) annotation).value(), false);
} else if (annotation instanceof PATCH) {
parseHttpMethodAndPath("PATCH", ((PATCH) annotation).value(), true);
} else if (annotation instanceof POST) {
parseHttpMethodAndPath("POST", ((POST) annotation).value(), true);
} else if (annotation instanceof PUT) {
parseHttpMethodAndPath("PUT", ((PUT) annotation).value(), true);
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if (annotation instanceof DELETE) {
parseHttpMethodAndPath("DELETE", ((DELETE) annotation).value(),
false);
} else if (annotation instanceof GET) {
parseHttpMethodAndPath("GET", ((GET) annotation).value(), false);
} else if (annotation instanceof HEAD) {
parseHttpMethodAndPath("HEAD", ((HEAD) annotation).value(), false);
} else if (annotation instanceof PATCH) {
parseHttpMethodAndPath("PATCH", ((PATCH) annotation).value(), true);
} else if (annotation instanceof POST) {
parseHttpMethodAndPath("POST", ((POST) annotation).value(), true);
} else if (annotation instanceof PUT) {
parseHttpMethodAndPath("PUT", ((PUT) annotation).value(), true);
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HTTPϝιουΛಓʹύʔε
if (annotation instanceof DELETE) {
parseHttpMethodAndPath("DELETE", ((DELETE) annotation).value(),
false);
} else if (annotation instanceof GET) {
parseHttpMethodAndPath("GET", ((GET) annotation).value(), false);
} else if (annotation instanceof HEAD) {
parseHttpMethodAndPath("HEAD", ((HEAD) annotation).value(), false);
} else if (annotation instanceof PATCH) {
parseHttpMethodAndPath("PATCH", ((PATCH) annotation).value(), true);
} else if (annotation instanceof POST) {
parseHttpMethodAndPath("POST", ((POST) annotation).value(), true);
} else if (annotation instanceof PUT) {
parseHttpMethodAndPath("PUT", ((PUT) annotation).value(), true);
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HTTPϝιου͕ࢦఆ͞Εͯͳ͚Εɺ
IllegalArgumentException͕εϩʔ͞Ε·͢
if (httpMethod == null) {
throw methodError(method,
"HTTP method annotation is required (e.g., @GET, @POST, etc.).");
}
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body͕ແͯ͘(PATCH,POST,PUTҎ֎)
@Multipart@FormUrlEncodedΛࢦఆͨ͠߹ɺ
IllegalArgumentException͕εϩʔ͞Ε·͢
if (!hasBody) {
if (isMultipart) {
throw methodError(method,
"Multipart can only be specified on HTTP methods with
request body (e.g., @POST).");
}
if (isFormEncoded) {
throw methodError(method, "FormUrlEncoded can only be specified
on HTTP methods with "
+ "request body (e.g., @POST).");
}
}
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int start = converterFactories.indexOf(skipPast) + 1;
for (int i = start,
count = converterFactories.size();
i < count; i++) {
Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
}
StringBuilder builder =
new StringBuilder("Could not locate ResponseBody converter for ")
.append(type)
.append(“.\n");
// লུ
throw new IllegalArgumentException(builder.toString());
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int start = converterFactories.indexOf(skipPast) + 1;
for (int i = start,
count = converterFactories.size();
i < count; i++) {
Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
}
StringBuilder builder =
new StringBuilder("Could not locate ResponseBody converter for ")
.append(type)
.append(“.\n");
// লུ
throw new IllegalArgumentException(builder.toString());
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Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
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Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
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Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
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Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
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Converter converter =
converterFactories.get(i)
.responseBodyConverter(type, annotations, this);
if (converter != null) {
return (Converter) converter;
}
responseBodyConverterϝιου͕
nullΛฦ͞ͳ͍Α͏ͳɺConverterFactory͕
converterFactoriesʹηοτͰ͖Εྑ͍
͜ͱ͕Θ͔ͬͨɻ
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
}
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val retrofit = Retrofit.Builder()
.baseUrl("https://api.github.com/")
.addConverterFactory(MyConverterFactory())
.build()
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repos.enqueue(object : retrofit2.Callback> {
override fun onFailure(call: Call>, t: Throwable) {
Log.d("GitHubSample", t.message)
}
override fun onResponse(
call: Call>, response: Response>) {
Log.d("GitHubSample", response.toString())
}
})
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repos.enqueue(object : retrofit2.Callback> {
override fun onFailure(call: Call>, t: Throwable) {
Log.d("GitHubSample", t.message)
}
override fun onResponse(
call: Call>, response: Response>) {
Log.d("GitHubSample", response.toString())
}
})
Ϋϥογϡ͠ͳ͘ͳ͕ͬͨɺ
΄͍͠ͷListͰ
StringͰͳ͍
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Retrofit͕ConverterΛ༻ҙ
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ConverterͰ ResponseBody ͔Β Listʹม
https://github.com/Kotlin/kotlinx.serialization
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data class Repo(val name: String)
ConverterͰ ResponseBody ͔Β Listʹม
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import kotlinx.serialization.Serializable
@Serializable
data class Repo(val name: String)
ConverterͰ ResponseBody ͔Β Listʹม
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class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
ConverterͰ ResponseBody ͔Β Listʹม
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class MyResponseBodyConverter : Converter> {
override fun convert(value: ResponseBody): List? {
// ResponseBody͔ΒStringͷม෦লུ
val json = Json { strictMode = false }
return json.parse(Repo.serializer().list, content))
}
}
class MyResponseBodyConverter : Converter {
override fun convert(value: ResponseBody): String? {
return "test"
}
}
ConverterͰ ResponseBody ͔Β Listʹม
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ListΛऔಘ
ConverterͰ ResponseBody ͔Β Listʹม
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
}
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class MyConverterFactory : Converter.Factory() {
override fun responseBodyConverter(
type: Type,
annotations: Array,
retrofit: Retrofit
): Converter? {
return MyResponseBodyConverter()
}
override fun requestBodyConverter(
type: Type,
parameterAnnotations: Array,
methodAnnotations: Array,
retrofit: Retrofit
): Converter<*, RequestBody>? {
return MyRequestBodyConverter()
}
}
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• RetrofitΞϊςʔγϣϯΛͬͯHTTPϝιουύε
Λࢦఆ͢Δ
• RetrofitProxy.newProxyInstanceΛͬͯΞϊςʔ
γϣϯΛύʔε͍ͯ͠Δ
• RepoΫϥεͷΑ͏ͳಠࣗͷܕʹม͢Δʹɺ
Converter͕ඞཁ
·ͱΊ
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࠷ޙʹ(1)
https://github.com/kwmt/RetrofitSample
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࠷ޙʹ(2)
https://github.com/JakeWharton/retrofit2-kotlinx-serialization-converter
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࠷ޙʹ(3)
DroidKaigi2020ͷCfSΛ
ʮৄࡉRetrofit2ʯͱ͍͏λΠτϧͰग़͠·ͨ͠ʂ
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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
@kwmt27