Android Taipei - Aug 2018 Talk about GraphQL integration with Android

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 : )