Android Networking: Fundamentals

Sep 6 2022 · Kotlin 1.6, Android 12, Android Studio Chipmunk | 2021.2.1 Patch 1

Part 2: Implement Retrofit Basics

15. Add Queries to Calls

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Previous episode: 14. Challenge: Create Retrofit Calls Next episode: 16. Implement the Moshi Parser

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Notes: 15. Add Queries to Calls

The student materials have been reviewed and are updated as of July 2022.

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Up until now, you only sent data as the body parameter, when you had a whole object to send. But sometimes, you don’t need entire objects, you just need to filter or search by one or two parameters. In that case, you often use queries.

@POST("/api/note/complete")
fun completeTask(
    @Header("Authorization") token: String,
    @Query("id") noteId: String): Call<ResponseBody>

@POST("/api/note")
fun addTask(
    @Header("Authorization") token: String,
    @Body request: RequestBody): Call<ResponseBody>

class CompleteNoteResponse(val message: String?)

apiService.completeTask(App.getToken(), taskId).enqueue(object : Callback<ResponseBody> {
  override fun onFailure(call: Call<ResponseBody>, error: Throwable) {
    onTaskCompleted(error)
  }

  override fun onResponse(call: Call<ResponseBody>, response: Response<ResponseBody>) {
    val jsonBody = response.body()?.string()

    if (jsonBody == null) {
      onTaskCompleted(NullPointerException("No response!"))
      return
    }

    val completeNoteResponse = gson.fromJson(jsonBody, CompleteNoteResponse::class.java)
    if (completeNoteResponse?.message == null) {
      onTaskCompleted(NullPointerException("No response!"))
    } else {
      onTaskCompleted(null)
    }
  }
})

val body = RequestBody.create(
    MediaType.parse("application/json"), gson.toJson(addTaskRequest)
)

apiService.addTask(App.getToken(), body).enqueue(object : Callback<ResponseBody> {
  override fun onFailure(call: Call<ResponseBody>, error: Throwable) {
    onTaskCreated(null, error)
  }

  override fun onResponse(call: Call<ResponseBody>, response: Response<ResponseBody>) {
    val jsonBody = response.body()?.string()

    if (jsonBody == null) {
      onTaskCreated(null, NullPointerException("No response!"))
      return
    }

    val data = gson.fromJson(jsonBody, Task::class.java)

    if (data == null) {
      onTaskCreated(null, NullPointerException("No response!"))
      return
    } else {
      onTaskCreated(data, null)
    }
  }
})