Retrofit Tutorial Part 3 - POST REQUEST & FORM URLENCODED - Android Studio Tutorial

Veröffentlicht am: 21 Oktober 2018
auf dem Kanal: Coding in Flow

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In part 3 of the Retrofit tutorial, we will learn how to make HTTP POST requests on a REST API to create new resources.
For this we use the @POST annotation in our interface, define the relative URL endpoint and pass the object that we want to send to the server as an argument that we annotate with @Body. The GSON converter will then serialize this object into the JSON format before it is uploaded to the server. If we want to serialize the object into another format (like XML or String), we can use a different ConverterFactory.
The same as in a GET request, the POST method returns a Call object that we can enqueue to execute it asynchronously. A successful POST request will return a 201 (Created) response code together with a response body in the onResponse callback.
Retrofit also supports form-urlencoded format (application/x-www-form-urlencoded). For this we have to annotate a POST method with @FormUrlEncoded and pass either single @Field arguments or a @FieldMap.

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