Your Android Open Source Library

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Your Android   Open Source Library Think, Build, Ship and Tweak Sangsoo Nam [email protected]

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Sangsoo Nam Senior Android Engineer at Spotify sangsoonam.github.io @sangsoonam

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Open Source

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Open Source Show your work

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Open Source Show your work Teach others

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Open Source Show your work Teach others Lower bugs

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Open Source Show your work Teach others Lower bugs Upstream improvement

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Open Source Show your work Teach others Lower bugs Great advertising Upstream improvement

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Open Source Show your work Teach others Lower bugs It’s fun! Great advertising Upstream improvement

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https:/ /spotify.github.io/

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https:/ /spotify.github.io/

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https:/ /spotify.github.io/

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Open Source Library

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Open Source Library Dagger2

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Open Source Library Dagger2 Picasso

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Open Source Library Dagger2 Picasso RxJava

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Open Source Library Dagger2 Picasso RxJava OkHttp

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Open Source Library Dagger2 Picasso RxJava OkHttp Guava

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Open Source Library Dagger2 Picasso RxJava AutoValue OkHttp Guava

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Open Source Library Dagger2 Picasso RxJava AutoValue OkHttp Guava compile ‘xxx:xxx:0.1.0’

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Java Library

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Think Build Ship

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{ "items": [ ... { "uri": "spotify:track:7MHN1aCFtLXjownGhvEQlF", "attributes": { "format_attributes": [ { "key": "status", "value": "UP" }, ... ] } }, { "uri": "spotify:track:7nKBxz47S9SD79N086fuhn", "attributes": { "format_attributes": [ { "key": "status", "value": "DOWN" }, ... ] } }, { "uri": "spotify:track:3rOSwuTsUlJp0Pu0MkN8r8", "attributes": { "format_attributes": [ { "key": "status", "value": "EQUAL" }, ... ] ≈ ≈ ≈

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if ("UP".equals(status)) { showIcon(iconUp); } else if("DOWN".equals(status)) { showIcon(iconDown); } else if("EQUAL".equals(status)) { showIcon(iconEqual); }

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if ("UP".equals(status)) { showIcon(iconUp); } else if("DOWN".equals(status)) { showIcon(iconDown); } else if("EQUAL".equals(status)) { showIcon(iconEqual); } • Every time string comparison with “equals” method • Typo error (e.g Upper or lower case)

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if (Status.UP == status) { showIcon(iconUp); } else if(Status.DOWN == status) { showIcon(iconDown); } else if(Status.EQUAL == status) { showIcon(iconEqual); } • No need to compare strings

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Think Avoid comparing strings every time   for JSON data Build Ship

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Ignore Case "UP" "DOWN" "EQUAL" Status.UP Status.DOWN Status.EQUAL "Up" "up" "DoWn" "down" “equaL"

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Edge Cases "ALIEN" return null throw new EnumConstantNotPresentException()

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Edge Cases "ALIEN" return null throw new EnumConstantNotPresentException() "SHUFFLE-PLAY" Mode.SHUFFLE_PLAY • Enum doesn’t allow “_” • Support conversion

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EnumParser public enum Status { UP, DOWN, EQUAL; } @Test public void testEnumParser() { assertThat(EnumParser.forClass(Status.class).parse("UP")).isSameAs(Status.UP); assertThat(EnumParser.forClass(Status.class).parse("up")).isSameAs(Status.UP); assertThat(EnumParser.forClass(Status.class).parse("uP")).isSameAs(Status.UP); assertThat(EnumParser.forClass(Status.class).parse("DOWN")).isSameAs(Status.DOWN); assertThat(EnumParser.forClass(Status.class).parse("EQUAL")).isSameAs(Status.EQUAL); }

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EnumParser @Test public void testEnumParser() { assertThat(EnumParser.forClass(Status.class).parse("ALIEN")).isNull(); } @Test(expected = EnumConstantNotPresentException.class) public void testEnumParserStrict() { EnumParser.forClass(Status.class).parseStrict("ALIEN") } @Test public void testEnumParserVariation() { EnumParser enumParser = EnumParser.forClass(Mode.class).withVariation( (mode) -> mode.name().replaceAll("_", "-") ); assertThat(enumParser.parse("SHUFFLE_PLAY")).isSameAs(Mode.SHUFFLE_PLAY); assertThat(enumParser.parse("SHUFFLE-PLAY")).isSameAs(Mode.SHUFFLE_PLAY); }

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Think Avoid comparing strings every time   for JSON data Build EnumParser:   Case insensitive parser   from string to Enum Ship

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Open Source Library

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Open Source Library

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“Is this open source project?”

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Licenses Exclusive copyright by default. Have to say what others can do with it.

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MIT Apache 2.0 GPLv3 Permissions • Commercial use • Distribution • Modification • Private use • Commercial use • Distribution • Modification • Private use • Patent use • Commercial use • Distribution • Modification • Private use • Patent use Conditions • License and copyright notice • License and copyright notice • State changes • License and copyright notice • State changes • Disclose source • Same license Limitations • Liability • Warranty • Liability • Warranty • Trademark use • Liability • Warranty Weaker Stronger https:/ /choosealicense.com/licenses/

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Document What is this project? How to use it? Is it open source? Which license? How can I contribute?

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https:/ /www.udacity.com/course/writing-readmes--ud777

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CI Badges Make sure every thing works after any change. Show your project is stable and well tested.

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Build Status

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.travis.yml language: java

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Test Coverage

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https:/ /coveralls.io/

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build.gradle plugins { id 'jacoco' id 'com.github.kt3k.coveralls' version '2.8.1' } … jacocoTestReport { reports { xml.enabled = true // coveralls plugin depends on xml format report html.enabled = true } }

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.travis.yml language: java after_success: - ./gradlew test jacocoTestReport coveralls

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Open Source Library

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Open Source Library

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compile 'com.google.dagger:dagger:2.11' compile 'com.squareup.picasso:picasso:2.5.2' compile 'com.squareup.okhttp3:okhttp:3.8.1'

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Library Repository Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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Library Repository compile ’xxx:xxx:0.1.0’ Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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Library Repository compile ’xxx:xxx:0.1.0’ Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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Library Repository compile ’xxx:xxx:0.1.0’ JFrog Bintray   jcenter Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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Library Repository compile ’xxx:xxx:0.1.0’ Sonatype  Maven Central JFrog Bintray   jcenter Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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Library Repository compile ’xxx:xxx:0.1.0’ Sonatype  Maven Central JFrog Bintray   jcenter Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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jcenter Maven repository hosted by JFrog Bintray. Deliver library though CDN. Largest Java Repository. Support easy way to upload  Maven Central

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https:/ /bintray.com

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Maven A project management and comprehension tool providing a way to help with managing: • Builds • Dependencies • Releases • Distributions  group_id:artifact_id:version POM(Project Object Model) file describes the project. 'com.google.dagger:dagger:2.11'

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build.gralde apply plugin: 'maven-publish' ... ext { PUBLISH_GROUP_ID = 'io.github.sangsoonam' PUBLISH_VERSION = '0.1.0' }   publishing { publications { MyPublication(MavenPublication) { from components.java groupId = PUBLISH_GROUP_ID version = PUBLISH_VERSION } } }

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Command ~/enumparser> ./gradlew publishToMavenLocal :enumparser:generatePomFileForMyPublicationPublication :enumparser:compileJava UP-TO-DATE :enumparser:processResources UP-TO-DATE :enumparser:classes UP-TO-DATE :enumparser:jar :enumparser:publishMyPublicationPublicationToMavenLocal :enumparser:publishToMavenLocal BUILD SUCCESSFUL Total time: 5.307 secs ~/enumparser> ls -al ~/.m2/repository/io/github/sangsoonam/enumparser/0.1.0 total 16 drwxr-xr-x 4 sangsoo staff 136 Aug 8 21:36 . drwxr-xr-x 5 sangsoo staff 170 Aug 8 21:36 .. -rw-r--r-- 1 sangsoo staff 2174 Aug 8 21:37 enumparser-0.1.0.jar -rw-r--r-- 1 sangsoo staff 613 Aug 8 21:37 enumparser-0.1.0.pom

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pom.xml ~/enumparser> cat ~/.m2/repository/io/github/sangsoonam/enumparser/0.1.0/enumparser-0.1.0.pom 4.0.0 io.github.sangsoonam enumparser 0.1.0 com.google.guava guava 11.0.1 runtime

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Don’t release it manually!

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build.gralde plugins { id "com.jfrog.bintray" version "1.7" } ... bintray { user = System.getenv('BINTRAY_USER') key = System.getenv('BINTRAY_API_KEY') publications = ['MyPublication'] publish = true pkg { repo = PUBLISH_ARTIFACT_ID name = PUBLISH_ARTIFACT_ID version { name = 'v' + PUBLISH_VERSION released = new Date() } } }

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Command ~/enumparser> ./gradlew bintrayUpload :enumparser:generatePomFileForMyPublicationPublication :enumparser:compileJava UP-TO-DATE :enumparser:processResources UP-TO-DATE :enumparser:classes UP-TO-DATE :enumparser:jar UP-TO-DATE :enumparser:javadoc UP-TO-DATE :enumparser:javadocJar UP-TO-DATE :enumparser:sourceJar UP-TO-DATE :enumparser:publishMyPublicationPublicationToMavenLocal :enumparser:bintrayUpload BUILD SUCCESSFUL Total time: 6.62 secs

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build.gralde repositories { maven { url "http://dl.bintray.com/sangsoonam/enumparser" }  jcenter() } dependencies { compile 'io.github.sangsoonam:enumparser:0.1.0' }

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Artifact Repository

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Artifact Repository Maven Release .jar + pom.xml JFrog Bintray   jcenter

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Artifact Repository Maven Release .jar + pom.xml JFrog Bintray   jcenter Your Bintray Upload

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Artifact Repository Maven Release .jar + pom.xml JFrog Bintray   jcenter Your Bintray Upload Sync

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Maven Central Maven repository hosted by Sonatype. Well known. Quite hard to start but   have good guidelines for releasing.

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https:/ /issues.sonatype.org/

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https:/ /issues.sonatype.org/

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https:/ /issues.sonatype.org/

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Artifact Repository Maven Release .jar + pom.xml JFrog Bintray   jcenter Your Bintray Upload Sync

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Artifact Repository Maven Release .jar + pom.xml JFrog Bintray   jcenter Your Bintray Upload Sync Sonatype  Maven Central Sync

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Maven Central Requirements Have source and javadoc artifacts. POM(Project Object Model) should have enough information for the project. • Project Name • Project Description • Project URL • License • SCM URL • Developer information Artifacts should be signed for validation.

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pom.xml ~/enumparser> cat ~/.m2/repository/io/github/sangsoonam/enumparser/0.1.0/enumparser-0.1.0.pom 4.0.0 io.github.sangsoonam enumparser 0.1.0 com.google.guava guava 11.0.1 runtime

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build.gradle task javadocJar (type: Jar, dependsOn: javadoc) { classifier "sources" from javadoc.destinationDir } task sourceJar(type: Jar) { classifier "javadoc" from sourceSets.main.allJava } publishing { publications { MyPublication(MavenPublication) { from components.java groupId = PUBLISH_GROUP_ID version = PUBLISH_VERSION artifact sourceJar artifact javadocJar } } }

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build.gradle publishing { publications { MyPublication(MavenPublication) { from components.java groupId = PUBLISH_GROUP_ID version = PUBLISH_VERSION artifact sourceJar artifact javadocJar pom.withXml { asNode().children().last() + pomConfig } } } } ≈ def pomConfig = { description(PUBLISH_DESCRIPTION){} name PUBLISH_ARTIFACT_ID url GITHUB_URL licenses { license { name 'MIT License' url ‘http://www.opensource.org/...' } } scm { url GITHUB_URL } developers { developer { name DEVELOPER_NAME } } }

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pom.xml ~/enumparser> cat ~/.m2/repository/io/github/sangsoonam/enumparser/0.1.0/enumparser-0.1.0.pom ... Utility for parsing a string to Enum constant. enumparser https://github.com/SangsooNam/enumparser MIT License http://www.opensource.org/licenses/mit-license.php https://github.com/SangsooNam/enumparser Sangsoo Nam

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Don’t release it manually!

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Don’t release it manually!

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build.gralde plugins { id "com.jfrog.bintray" version "1.7" } bintray { user = System.getenv('BINTRAY_USER') key = System.getenv('BINTRAY_API_KEY') publications = ['MyPublication'] publish = true pkg { repo = PUBLISH_ARTIFACT_ID name = PUBLISH_ARTIFACT_ID version { name = 'v' + PUBLISH_VERSION released = new Date() mavenCentralSync { user = System.getenv('OSS_USER') password = System.getenv('OSS_PASSWORD') } } } }

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“jcenter should be enough to release, but good to follow   Maven Central requirements”

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Android Library

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AAR Android Archive Library. Includes resources such as layouts, drawables, strings and etc. 

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Think Build Ship

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Duotone Image A half-tone illustration made from a single original image with two different colours.

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Duotone Image A half-tone illustration made from a single original image with two different colours.

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Build Ship Think Convert images as a duotone

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Sample Code

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Build DuotoneImageView:  Custom ImageView for Android Ship Think Convert images as a duotone

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CI Badges Make sure every thing works after any change. Show your project is stable and well tested.

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Build Status

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.travis.yml language: android jdk: oraclejdk8 android: components: - tools - platform-tools - build-tools-25.0.1 - android-25 - extra-android-m2repository

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Test Coverage

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build.gradle buildscript { dependencies { classpath 'com.dicedmelon.gradle:jacoco-android:0.1.1' } } plugins { id 'jacoco-android' id 'com.github.kt3k.coveralls' version '2.5.0-x' } android { ... testOptions { unitTests.all { jacoco { // To include Robolectric tests includeNoLocationClasses = true } } } } coveralls { jacocoReportPath = "${buildDir}/reports/jacoco/jacocoTestDebugUnitTestReport/jacocoTestDebugUnitTestReport.xml" }

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.travis.yml language: android ... after_success: - ./gradlew testDebugUnitTest jacocoTestReport coveralls

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Artifact Repository compile ’xxx:xxx:0.1.0’ Sonatype  Maven Central JFrog Bintray   jcenter Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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Artifact Repository compile ’xxx:xxx:0.1.0’ Sonatype  Maven Central JFrog Bintray   jcenter Icons made by Freepik from www.flaticon.com is licensed by CC 3.0 BY

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build.gralde apply plugin: 'maven-publish' ext { PUBLISH_GROUP_ID = 'io.github.sangsoonam' PUBLISH_VERSION = '0.1.1' } publishing { publications { MyPublication(MavenPublication) { groupId = PUBLISH_GROUP_ID version = PUBLISH_VERSION artifact "${project.buildDir}/outputs/aar/${project.name}-release.aar" } } } ≈

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Command ~/duotoneimageview> ./gradlew publishToMavenLocal :duotoneimageview:generatePomFileForMyPublicationPublication :duotoneimageview:javadoc :duotoneimageview:javadocJar :duotoneimageview:sourceJar :duotoneimageview:publishMyPublicationPublicationToMavenLocal :duotoneimageview:publishToMavenLocal BUILD SUCCESSFUL Total time: 7.791 secs ~/duotoneimageview> ls -al ~/.m2/repository/io/github/sangsoonam/duotoneimageview/0.1.0 total 96 drwxr-xr-x 6 sangsoo staff 204 Aug 9 09:51 . drwxr-xr-x 4 sangsoo staff 136 Aug 9 09:51 .. -rw-r--r-- 1 sangsoo staff 16749 Aug 9 08:43 duotoneimageview-0.1.0.aar -rw-r--r-- 1 sangsoo staff 925 Aug 9 09:51 duotoneimageview-0.1.0.pom

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Command ~/duotoneimageview> ./gradlew bintrayUpload :duotoneimageview:generatePomFileForMyPublicationPublication :duotoneimageview:javadoc UP-TO-DATE :duotoneimageview:javadocJar UP-TO-DATE :duotoneimageview:sourceJar UP-TO-DATE :duotoneimageview:publishMyPublicationPublicationToMavenLocal :duotoneimageview:bintrayUpload BUILD SUCCESSFUL Total time: 9.842 secs

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build.gradle task sourceJar(type: Jar) { classifier = 'sources' from android.sourceSets.main.java.srcDirs } task javadoc(type: Javadoc) { source = android.sourceSets.main.java.srcDirs classpath += project.files(android.getBootClasspath().join(File.pathSeparator)) } task javadocJar(type: Jar, dependsOn: javadoc) { classifier = 'javadoc' from javadoc.destinationDir } publishing { publications { MyPublication(MavenPublication) { groupId = PUBLISH_GROUP_ID version = PUBLISH_VERSION artifact "${project.buildDir}/outputs/aar/${project.name}-release.aar" artifact sourceJar artifact javadocJar } } }

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build.gradle publishing { publications { MyPublication(MavenPublication) { groupId = PUBLISH_GROUP_ID version = PUBLISH_VERSION ... artifact sourceJar artifact javadocJar pom.withXml { asNode().children().last() + pomConfig } } } } ≈ def pomConfig = { description(PUBLISH_DESCRIPTION){} name PUBLISH_ARTIFACT_ID url GITHUB_URL licenses { license { name 'MIT License' url ‘http://www.opensource.org/...' } } scm { url GITHUB_URL } developers { developer { name DEVELOPER_NAME } } }

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build.gralde plugins { id "com.jfrog.bintray" version "1.7" } bintray { user = System.getenv('BINTRAY_USER') key = System.getenv('BINTRAY_API_KEY') publications = ['MyPublication'] publish = true pkg { repo = PUBLISH_ARTIFACT_ID name = PUBLISH_ARTIFACT_ID version { name = PUBLISH_VERSION released = new Date() mavenCentralSync { user = System.getenv('OSS_USER') password = System.getenv('OSS_PASSWORD') } } } } ≈

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Summary • Your code is valuable for other developers. Open your code. • Don’t forget the license • Document, document and document. • Continuous Integration: building and unit testing. • Release your library: jcenter or Maven central • Tweak if you have requests or pull request. Lib App Lib Lib

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Open source repositories • https://github.com/SangsooNam/enumparser • https://github.com/SangsooNam/duotoneimageview Questions Sangsoo Nam [email protected]

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