Retrofit + Kotlin + Android jetpack

InSide Sample :

1. Get data from API by using retrofit

2. Parse data from retrofit

3. Showing all data in androidx jetpack

4. All code in KOTLIN

API : https://reqres.in/api/users?page=1

1. All dependencies :

    dependencies {
        implementation fileTree(dir: 'libs', include: ['*.jar'])
        implementation 'androidx.appcompat:appcompat:1.1.0-alpha05'

      // app compact
      implementation "androidx.appcompat:appcompat:1.1.0-alpha05"

      // constraint layout
      implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

      // recycle view
      implementation 'androidx.recyclerview:recyclerview:1.1.0-alpha05'

      // glide
      implementation 'com.github.bumptech.glide:glide:4.9.0'
      annotationProcessor 'com.github.bumptech.glide:compiler:4.9.0'

      // retrofit
      implementation 'com.squareup.retrofit2:retrofit:2.5.0'
      implementation 'com.squareup.okhttp3:logging-interceptor:3.11.0'
      // gson convertor
      implementation 'com.squareup.retrofit2:converter-gson:2.5.0'

      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'androidx.test:runner:1.2.0-beta01'
      androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0-beta01'
      implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
      }

2. Retrofit Network Client:

object NetworkClient{

private val BASE_URL = " https://reqres.in"
private val TIMEOUT = 10
var retrofit: Retrofit? = null
/*
This public static method will return Retrofit client
anywhere in the appplication
*/
val retrofitClient: Retrofit
    get() {
        if (retrofit == null) {
            val okHttpClientBuilder = OkHttpClient.Builder()
            okHttpClientBuilder.connectTimeout(TIMEOUT.toLong(), TimeUnit.SECONDS)
            retrofit = Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .client(okHttpClientBuilder.build())
                    .build()
        }
        return retrofit!!
    }

 }

3. API End User

    /**
     * API for getting weather from https://darksky.net/
     */
    interface APIUser {

        @GET("api/users?")
        fun getUserList(@QueryMap options: Map<String, String>): Call<BaseUser>
    }

4. Now Hit API

val retrofit = NetworkClient.retrofitClient
        mApiUser = retrofit.create<APIUser>(APIUser::class.java)

    val data = HashMap<String, String>()
    data["page"] = "1"

    val apiUserCall = mApiUser!!.getUserList(data)
    /*
    This is the line which actually sends a network request. Calling enqueue() executes a call asynchronously. It has two callback listeners which will invoked on the main thread
    */

    apiUserCall.enqueue(object : Callback<BaseUser> {

        override fun onResponse(call: Call<BaseUser>?, response: Response<BaseUser>?) {
            /*This is the success callback. Though the response type is JSON, with Retrofit we get the response in the form of WResponse POJO class
             */
            if (response?.body() != null) {
                retrofitEventListener.onSuccess(call, response?.body())
            }
        }
        override fun onFailure(call: Call<BaseUser>?, t: Throwable?) {
            /*
            Error callback
            */
            retrofitEventListener.onError(call, t)
        }
    })

License

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

lucheng2 / RetrofitKotlin