PrototypeAndroid

A sample project which demostrates simple ways to prototype android apps without backend api's

Medium post related to this repo

Using json server

Provides quick explanation on using Json-server for prototyping android,and also addresses some gotchas.

Using OkHttp Interceptors.

Using OkHttp to intercept network requets and reply with the json response available in local file.

public Response intercept(Chain chain) throws IOException {
    final String url = chain.request().url().toString();
    switch (url) {
        case "http://10.42.0.1:3000/contacts": {
            final ResponseBody responseBody = ResponseBody
                    .create(MediaType.parse("application/json"), readFromFile("contacts_response.json"));
            final Response response = new Response
                    .Builder()
                    .body(responseBody)
                    .request(chain.request()).message("OK")
                    .protocol(Protocol.HTTP_1_1)
                    .code(200)
                    .build();
            return response;
        }
    }
    return chain.proceed(chain.request());
}

Using Network Behaviour with MockRetrofit.

Providing MockRetrofit

    @Provides
    public MockRetrofit provideMockRetrofit(Retrofit retrofit){
        final NetworkBehavior behavior = NetworkBehavior.create();
        behavior.setErrorPercent(50);
        behavior.setDelay(4, TimeUnit.SECONDS);
        behavior.setVariancePercent(10);
        final ExecutorService executor = Executors.newSingleThreadExecutor();
        final MockRetrofit mockRetrofit = new MockRetrofit.Builder(retrofit).backgroundExecutor(executor).networkBehavior(behavior).build();
        return mockRetrofit;
    }

Providing Network service wrapped with behaviour delegate.

 @Provides
    public static ContactListService provideContactListService(MockRetrofit retrofit, Context context){
        final BehaviorDelegate<ContactListService> mockContactsServiceBehaviorDelegate = retrofit.create(ContactListService.class);
        return new MockContactService(context,mockContactsServiceBehaviorDelegate);
    }