This document provides an introduction to GraphQL, including how to write queries and mutations, define schemas and types, and integrate GraphQL with Android applications. It discusses key GraphQL concepts like queries, mutations, schemas, types and code generation. It also provides examples of initializing Apollo Client and making GraphQL requests from Android apps using callbacks or RxJava. Potential issues like handling multiple schemas and mocking API responses are also briefly mentioned.

1. Exploring GraphQL
Kami

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Outline
• Introduction
• Queries & Mutations
• Schemas & Types
• Integrate with Android
• Coming issues
• Reference

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What is GraphQL ?
• A query language for APIs
• Specification for server-side to execute queries
• Single endpoint

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Why GraphQL ?
• Ask for what you need, get exactly that
• Get many resources in a single request

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GraphQL Example

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Queries & Mutations

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Fields

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Arguments

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Aliases

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Fragments

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Queries

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Variables

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Mutations

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Schemas & Types

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Object types

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Arguments

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Query & Mutation types

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Scalar types
• Int
• Float
• String
• Boolean
• ID

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Enum types

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Interfaces

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Union types

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Input types

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Integrate with Android

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Gradle
• build.gradle
classpath 'com.apollographql.apollo:apollo-gradle-plugin:1.0.0-alpha'
• app/build.gradle
apply plugin: 'com.apollographql.android'
implementation 'com.apollographql.apollo:apollo-runtime:1.0.0-alpha'
implementation 'com.apollographql.apollo:apollo-android-support:1.0.0-alpha'

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Codegen
• Use Apollo GraphQL code generator
$ apollo-codegen introspect-schema https://{ip}/graphql --output schema.json

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OkHttp Support
val okHttpClient = OkHttpClient.Builder()
.addNetWorkInterceptor(interceptor)
.build()

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Apollo Client
val apolloClient = ApolloClient.builder()
.serverUrl(BASE_URL)
.okHttpClient(okHttpClient)
.build()

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Query Request
val trendQuery = TrendQuery.builder()
.first(25)
.query("Android Taipei")
.type(SearchType.REPOSITORY)
.build()

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ApolloCall & execute
val apolloCall = apolloClient.query(trendQuery)
apolloCall.enqueue(object : ApolloCall.Callback<TrendQuery.Data>() {
override fun onResponse(response: Response<TrendQuery.Data>) {}
override fun onFailure(e: ApolloException) {}
})

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RxJava Support
Rx2Apollo.from(apolloClient.query(trendQuery))
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe()

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Coming issues
• Multiple schemas ?
• Mock API response

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Multiple schemas ?

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Mock API response

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Reference
• https://graphql.org/
• https://github.com/apollographql/apollo-cli/tree/apollo-codegen
• https://github.com/apollographql/apollo-android
• https://developer.github.com/v4/

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Thank you : )