Setup retrofit For Action

Lets set the Retrofit for Action 

 

Let's Start Our retrofit setup 

retrofit = "2.11.0"

retrofit = { group ="com.squareup.retrofit2" , name = "retrofit", version.ref = "retrofit" }

Also add the gson converter 

retrofit-converter-gson = { group ="com.squareup.retrofit2" , name = "converter-gson", version.ref = "retrofit" }

Now implement in build.gradle 

implementation(libs.retrofit)
implementation(libs.retrofit.converter.gson)

Done !!

Lets create a interface 

interface ApiInterface {

    @GET("/posts")
    suspend fun getPosts() : List <Post>


    @GET("posts/{id}")
    suspend fun getPostById(@Path("id") id: Int): Post

    @POST("posts")
    suspend fun createPost(@Body newPost: Post): Post

    @PUT("posts/{id}")
    suspend fun updatePost(@Path("id") id: Int, @Body updatedPost: Post): Post

    @DELETE("posts/{id}")
    suspend fun deletePost(@Path("id") id: Int): Response<Unit>



}

Also create its usage now 

class MainViewModel : ViewModel() {
    private val _posts = MutableStateFlow<List<Post>?>(null)
    val post = _posts.asStateFlow()


    companion object {
        private fun getRetrofitService(): ApiInterface {
            val retrofit = Retrofit
                .Builder()
                .baseUrl("https://jsonplaceholder.typicode.com")
                .addConverterFactory(GsonConverterFactory.create())
                .build()

            return retrofit.create(ApiInterface::class.java)
        }
    }


    init {
        getPosts()
    }


    fun getPosts() {
        viewModelScope.launch(
            Dispatchers.IO
        ) {
           _posts.update {
               getRetrofitService().getPosts()
           }
        }
    }


}

Done !! test it with your compsable !!

lets have some special cases 

Query Parameters

To pass query parameters, use @Query:

............