Working with API
- 2. 丼仂 舒从仂亠 Retrofit Retrofit (仂亞仍舒仆仂 仂亳亳舒仍仆仂仄 舒亶) 亳仗仂弍亠亰仂仗舒仆亶 HTTP-从仍亳亠仆 亟仍 Android 亳 Java. 仆 磦仍磳 仆亠亰舒仄亠仆亳仄仄 亳仆仄亠仆仂仄 亟仍 舒弍仂 API 于 从仍亳亠仆- 亠于亠仆 仗亳仍仂亢亠仆亳. 舒从亳-仂 仍亠 5 仆舒亰舒亟 Android- 舒亰舒弍仂亳从舒仄 亟仍 舒弍仂 亠 仗亳仂亟亳仍仂 于仂仂亳 亞仂 从仂亟舒 仂弍舒仆仄亳 于亰仂于舒仄亳, AsyncTask'舒仄亳 亳 仗仂亳仄亳 束仆亳亰从仂仂于仆亠于仄亳損 于亠舒仄亳. 从仂仄仗舒仆亳 Square 于仗亳仍舒 舒从 亰舒仄亠舒亠仍仆 弍亳弍仍亳仂亠从 Retrofit.
- 3. 仂弍舒于仍磳仄 于 build.gradle compile 'com.squareup.retrofit2:retrofit:2.3.0' 亢亟亠仄 舒舒亠仄 Retrofit 亳 OkHttp
- 4. 舒亰舒 endpoint - 弌仂亰亟舒亠仄 从仍舒 亳仗舒 Interface 亳 仂仗亳于舒亠仄 于亠 仆舒亳 仆亟仗仂亳仆 public interface Endpoint { } 亳仄亠 仆舒 Kotlin
- 5. 个仂仄舒 亠仆亟仗仂亳仆仂于 仍亳 仆亢仆仂 亟仂弍舒于亳 亟亳仆舒仄亳亠从亳 仂仄亳仂于舒 仍 仂 亳仗仂仍亰亠仄 Path @GET("group/{id}/users") Call<List<User>> groupList(@Path("id") int groupId); 仍亳 仆亢仆仂 于舒于仍 仗舒舒仄亠 于 Get 亰舒仗仂 亳仗舒 ?sort=desc 仂 @Query("sort") String sort 仍亳 仗亳仂从 仗舒舒仄亠仂于 query 亟亳仆舒仄亳亠仆 仂 亳仗仂仍亰亠仄 @QueryMap Map<String, String> options
- 6. 丐舒从亢亠 仄 仄仂亢亠仄 仂仗舒于仍 仂弍亠从 从舒从 亠仍仂 亰舒仗仂舒. @POST("users/new") Call<User> createUser(@Body User user); 丐舒从亢亠 POST 亰舒仗仂 亟仂仍亢仆 弍 于 仂仄舒亠 Form-encoded @FormUrlEncoded @POST("user/edit") Call<User> updateUser(@Field("first_name") String first, @Field("last_name") String last); 仍亳 亢亠 仄 亟仂弍舒于仍磳仄 从舒仂仄仆亠 仂弍亠从 于 于亳亟亠 仂仂从 亳仍亳 舒亶仍仂于 仂 仆亠仂弍仂亟亳仄仂 亳仗仂仍亰仂于舒 MultiPart @Multipart @PUT("user/photo") Call<User> updateUser(@Part("photo") RequestBody photo, @Part("description") RequestBody description);
- 7. ApiClient.get().groupList(userId).enqueue(object: Callback<List<User>> { override fun onResponse(call: Call<ListDayWeather>?, response: Response<ListDayWeather>) { if (response.isSuccessful) { // viewInterface?.showUserList(response.body) } else { // viewInterface?.showAlert() } } override fun onFailure(call: Call<ListDayWeather>?, t: Throwable?) { viewInterface?.showNoInternet() } }) 亳仄亠 亰舒仗仂舒.
- 8. 亢仆仂 于 从舒亢亟亶 亰舒仗仂 亟仂弍舒于亳 亠亟亠? 丐舒仄 亞亟亠 弍亳仍亟亳仄 http 从仍亳亠仆 亟仂弍舒于仍磳仄 仍亠亟ﾑ亠亠 okBuilder.addInterceptor { chain -> val original = chain.request() val request = original.newBuilder() .header("lang", Storage.get().getLang()) .method(original.method(), original.body()) .build() chain.proceed(request) }
- 9. 仍亳 亠仍亳 仆亢仆仂 仗仂于仂亳 亰舒仗仂 仗仂仍亠 仆亠仗亠仆仂亞仂 于亰仂于舒. public static <T> void enqueueWithRetry(Call<T> call, final Callback<T> callback, MainActivityInterface activityInterface) { call.enqueue(new RetryableCallback<T>(call, activityInterface) { @Override public void onFinalResponse(Call<T> call, Response<T> response) { if (activityInterface != null) { activityInterface.onSuccess(); } callback.onResponse(call, response); } @Override public void onFinalFailure(Call<T> call, Throwable t) { if (activityInterface != null) { activityInterface.onErrorAfterRetry(); } callback.onFailure(call, t); } }); } 于亰于舒 仗亳 亰舒仗仂亠 ApiClient.get().groupList(userId).enqueue 仄亠仂 enqueue enqueueWithRetry
- 10. 弌舒仄 RetryableCallback public abstract class RetryableCallback<T> implements Callback<T> { private int totalRetries = 5; private static final String TAG = RetryableCallback.class.getSimpleName(); private final Call<T> call; private int retryCount = 0; MainActivityInterface activityInterface; public RetryableCallback(Call<T> call, MainActivityInterface activityInterface) { this.call = call; this.activityInterface = activityInterface; } @Override public void onResponse(Call<T> call, Response<T> response) { if (!isCallSuccess(response)) { if (retryCount++ < totalRetries) { Log.v(TAG, "Retrying API Call - (" + retryCount + " / " + totalRetries + ")"); if (activityInterface != null) { activityInterface.onErrorInRetry(); } retry(); } else { onFinalResponse(call, response); }
- 11. } else { onFinalResponse(call, response); } } @Override public void onFailure(Call<T> call, Throwable t) { Log.e(TAG, t.getMessage()); if (retryCount++ < totalRetries) { Log.v(TAG, "Retrying API Call - (" + retryCount + " / " + totalRetries + ")"); if (activityInterface != null) { activityInterface.onErrorInRetry(); } retry(); } else { onFinalFailure(call, t); } } public void onFinalResponse(Call<T> call, Response<T> response) { } public void onFinalFailure(Call<T> call, Throwable t) { } private void retry() { call.clone().enqueue(this); } public static boolean isCallSuccess(Response response) { int code = response.code(); return (code >= 200 && code < 400); } }
- 13. 亠仄 仗舒亳弍仂 !