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Ͱ͖Δʂ 
 Android Framework 
 Code Reading DroidKaigi 2021 Day 3

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• Shinobu Okano • @operandoOS / shinobu.dart • 10X, Inc. / Software Engineer • Flutter / Dart / Android / Automation ࣗݾ঺հ

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10X, Inc. - Stailer https://stailer.jp/

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We are waiting for YOU! https://jobs.10x.co.jp/

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͜ͷηογϣϯͷΰʔϧ • Android Frameworkͷίʔυ͕ͳΜͱͳ͘ಡΊΔΑ͏ʹͳΔ • πʔϧΛར༻ͯ͠ಡΈ͍ͨίʔυΛݟ͚ͭΒΕΔΑ͏ʹͳΔ • Android Frameworkͷίʔυ͕ಡΈͨ͘ͳΔʂ

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Android Framework 
 ͬͯͳʹʁ

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Android software stack • ͬ͘͟ΓݴͬͯAndroid OSΛߏ੒͍ͯ͠Δ΋ͷ • ͍͔ͭ͘ͷLayerͰ෼͔Ε͍ͯΔ • Android system architectureͱදݱ͞ΕΔ͜ͱ΋͋Δ • ͱʹ͔͘޿͍ɾͰ͔͍ɾਂ͍ɾ΍͹͍

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https://source.android.com/index.html https://source.android.com/setup/intro Android software stack

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• શLayerͷιʔείʔυ͕΄΅OSSͱͯ͠ެ։͞Ε͍ͯΔͷͰಡΊΔ • Kotlin/JavaͰΞϓϦ։ൃ͍ͯ͠Δਓ͕ؾܰʹಡΊΔͷ͸ Android Framework Layer • Android Framework Layer͸͓͓͔ͨJavaͰॻ͔Ε͍ͯΔ • ͦΕΑΓԼͷLayer͸C/C++ɺRustͳͲͰॻ͔Ε͍ͯΔ Android software stack

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ຊࢿྉʹ͓͚ΔAndroid Framework • Android Framework = Android software stack ͱ͍͏ 
 Ґஔ͚ͮͰॻ͍͍ͯ·͢ • ͨͩ͠ຊࢿྉͰ঺հ͢Δ͜ͱ͸্ҐϨΠϠʔ޲͚ͷ 
 Code ReadingΛϝΠϯλʔήοτͱ͍ͯ͠·͢

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Android FrameworkͷίʔυΛಡΉཧ༝ • ಡΉ͜ͱͰ಺෦ͷ࢓૊ΈΛཧղ͠ɺΞϓϦ։ൃ౳ʹ໾ཱͯΔ • ͳΜͱͳ͘಺෦ͷ࢓૊Έ஌Γ͍ͨͳʔͱ͍͏ڵຯ͕༙͍ͯ 
 ͠·͏͔Β • ָ͍͔͠Β☺

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Android Framework 
 Code ReadingΛ͢Δ্Ͱ 
 ศརͳαΠτɾπʔϧͷ঺հ

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Android Code Search “Code Search with Cross References for the Android Open Source Project” https://android-developers.googleblog.com/2019/12/code- search-with-cross-references-for-aosp.html

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Android Code Search https://cs.android.com/

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Android Code Search(ACS) • ϒϥ΢β্ͰAndroid FrameworkͷίʔυΛݕࡧɾӾཡ 
 Ͱ͖ΔαΠτ • ίʔυྔ͕๲େͳAndroid FrameworkͷίʔυΛಡΉ্Ͱ ඞਢπʔϧ • Google͕ӡӦΛ͍ͯ͠Δ

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Android Code Searchͷ͍͢͝ͱ͜Ζ • ݕࡧͷϑΟϧλʔ͕๛෋ • ߦ਺͕ଟ͍ίʔυͰ΋αΫαΫදࣔ͞ΕΔ • ϒϥϯνͷ੾Γସ͕͑Ͱ͖Δ • ૬ޓࢀরͷϦϯΫ͕షΒΕ͍ͯΔ • ϝιουͷ֊૚ݺͼग़͠ɺࢀর͕Θ͔Δ • Ξ΢τϥΠϯΊͪΌศརʂ

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ݕࡧͷϑΟϧλʔ͕๛෋ • ໨తͷίʔυΛ୳ͨ͢Ίʹ໾ཱͭϑΟϧλʔ͕͍ͬͺ͍ • ݕࡧ૭ͰϑΟϧλʔͷSyntaxΛิ׬ͯ͘͠ΕΔ • Syntax reference • https://developers.google.com/code-search/reference

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ߦ਺͕ଟ͍ίʔυͰ΋αΫαΫදࣔ͞ΕΔ • 1ສߦ͘Β͍ͷίʔυͳΒಡΈࠐΈ΋දࣔ΋αΫαΫ • ࢼ͠ʹIntent.javaΛ։͍ͯΈͯʂ • https://cs.android.com/android/platform/ superproject/+/master:frameworks/base/core/java/ android/content/Intent.java

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ϒϥϯνͷ੾Γସ͕͑Ͱ͖Δ • ಛఆOSόʔδϣϯͷಈ࡞Λௐ΂͍ͨ࣌ʹศར • ݹ͍OSόʔδϣϯͷϒϥϯν΋͋Δ • ίʔυΛ։͍ͨ··ϒϥϯν੾Γସ͑Ͱɺ੾Γସ͑ઌͷ 
 όʔδϣϯͷίʔυʹมΘΔ • ͦͷ͏ͪAndroid 12ͷϒϥϯν΋ग़Δ͸ͣ

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ϒϥϯνͷ੾Γସ͕͑Ͱ͖Δ

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૬ޓࢀরͷϦϯΫ͕షΒΕ͍ͯΔ • ϝιουɾΫϥεͳͲ΁ͷδϟϯϓ͕Ͱ͖Δ • ίʔυʹϦϯΫ͕షΒΕ͍ͯΔͷͰͦΕΛΫϦοΫ͢Δ͚ͩ • ͢΂ͯͷίʔυʹ૬ޓࢀরͷϦϯΫ͕͋ΔΘ͚͡Όͳ͍ 
 ͷͰ஫ҙ

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૬ޓࢀরͷϦϯΫ͕షΒΕ͍ͯΔ https://cs.android.com/android/platform/superproject/+/android-11.0.0_r40:frameworks/base/core/java/android/app/ Activity.java;l=5070

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૬ޓࢀরͷϦϯΫ͕షΒΕ͍ͯΔ https://cs.android.com/android/platform/superproject/+/android-11.0.0_r40:frameworks/base/core/java/android/app/ Activity.java;drc=55d98d2ba142d6c35894b1092397e2b5a70bc2e8;l=3440

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ϝιουͷ֊૚ݺͼग़͠ɺࢀর͕Θ͔Δ https://cs.android.com/android/platform/superproject/+/android-11.0.0_r40:frameworks/base/core/java/android/database/ sqlite/SQLiteDatabase.java;l=830;bpv=1;bpt=1

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ఆ਺΋ࢀর͞Ε͍ͯΔՕॴ͕Θ͔Δ https://cs.android.com/android/platform/superproject/+/android-11.0.0_r40:frameworks/base/core/java/android/database/ sqlite/SQLiteGlobal.java;l=46;bpv=1;bpt=0

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• Ϋϥεʹఆٛͯ͋͠Δ 
 ఆ਺ɺϝιουͳͲ͕ 
 ҰཡͰݟΕΔ Ξ΢τϥΠϯΊͪΌศརʂ

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• ϑΟϧλʔ΋Ͱ͖Δʂ Ξ΢τϥΠϯΊͪΌศརʂ

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• ΩʔϘʔυૢ࡞͚ͩͰ΋ ͋Δఔ౓࢖͑ΔΑ͏ʹ 
 ߟྀ͞Εͯͦ͏ ΩʔϘʔυγϣʔτΧοτ

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• ৭ʑม͑ΒΕΔ • ݕࡧ݁Ռ݅਺૿΍͢ͷ 
 ͓͢͢Ί • ࣗ෼ʹ߹ͬͨίʔυͷ 
 ϑΥϯταΠζʹมߋ͢Δ Android Code Searchͷઃఆ

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Android Code Search ૢ࡞σϞ • ࣮ࡍʹૢ࡞ͯ͠Δͱ͜ΖΛσϞ͠·͢ • ͥͻΈͳ͞Μ΋͓ࢼ͍ͩ͘͠͞ʂʂ • https://cs.android.com/

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“Code Search for Google open source projects” https://opensource.googleblog.com/2020/04/code-search-for- google-open-source.html Code Search͸Android͚ͩ͡Όͳ͍ʂ

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͜Μͳʹ͍ͬͺ͍ʂʂ https://cs.opensource.google/

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Chromium΋͋Δ https://source.chromium.org/chromium

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AOSP WebαΠτ • AOSP(Android Open Source Project) • https://source.android.com/index.html • Androidͷ৭Μͳ͜ͱ͕υΩϡϝϯτͰ·ͱ·ͬͯΔ • ڵຯ͋ΔςʔϚΛݟ͚ͭͯಡΜͰΈΔͷ͕͓͢͢Ί

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adb(Android Debug Bridge) • ৭ʑศརͳadbίϚϯυ • ୺຤ͷঢ়ଶΛ೺Ѳɾૢ࡞͢Δ্Ͱඞਢͳπʔϧ • ࠓճ͸Code Reading͢Δࡍʹɺݸਓతʹར༻ස౓͕ 
 ߴ͍ίϚϯυͷΈ঺հ

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adb(Android Debug Bridge) • adbͷৄࡉ΍ઃఆͳͲ͸ҎԼͷϦϯΫΛݟ͍ͯͩ͘͞ • https://developer.android.com/studio/command-line/ adb

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Logcat • AndroidγεςϜ͕ॻ͖ग़ͨ͠ϩάΛग़ྗ͢Δπʔϧ • ϩά͸Code Readingʹ໾ཱͭૉࡐͷҰͭ

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“Android Logging System” https://elinux.org/Android_Logging_System Logcat

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• جຊ͜ΕɻΦϓγϣϯ͸ඞཁʹͳͬͨΒ࢖͏ɻ Α͘࢖ͬͯΔLogcatίϚϯυྫ > ~ adb logcat -v time

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• mainҎ֎ͷϩά͕ݟ͍ͨ৔߹ʹ͸ -b Α͘࢖ͬͯΔLogcatίϚϯυྫ > ~ adb logcat -v time -b system

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LogcatΛදࣔͭͭ͠ϑΝΠϧʹॻ͖ࠐΉ • ϩάΛޙʑ·ͨݟ͍ͨ৔߹ʹศར • aliasʹ͓ͯ͘͠ͱ͍͍ > ~ adb logcat -v time | tee logcat_main_$ (date +"%Y%m%d-%H%M%S").log

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“Logcat command-line tool” https://developer.android.com/studio/command-line/logcat LogcatͷΦϓγϣϯʹ͍ͭͯৄ͘͠

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• ϩάόοϑΝͷαΠζΛ 
 େ͖͘͢Δ • ϩά͕ྲྀΕͯফ͑ͯ͠·͏ ͷΛܰݮͰ͖Δ • ։ൃऀ޲͚Φϓγϣϯ͔Β มߋͰ͖Δ Logcatͷ͓͢͢Ίઃఆ

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Logcatͷ࣮૷ • ͜͜ • https://cs.android.com/android/platform/ superproject/+/master:system/logging/logcat/

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dumpsys • γεςϜαʔϏεͷঢ়ଶΛग़ྗ͢Δπʔϧ • γεςϜαʔϏεؔ࿈ͷCode ReadingΛ͢Δࡍʹศར • ΞϓϦ։ൃ࣌ʹ΋໾ཱͭ • https://developer.android.com/studio/command-line/ dumpsys

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dumpsys • جຊతʹग़ྗ͍ͨ͠γεςϜαʔϏεΛࢦఆ͢Δ > ~ adb shell dumpsys

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“pecoΛ࢖ͬͯಛఆͷγεςϜαʔϏεͷ dumpsysΛ؆୯ʹ͢Δ” https://qiita.com/operandoOS/items/ 15bc6d1053d3ab31b300 dumpsys

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bugreport • ৭Μͳϩά͔ΒCode ReadingͷώϯτΛಘΔ৔߹ʹศར • औಘͰ͖Δϩάͷ਺͸ΊͬͪΌଟ͍ > ~ adb bugreport

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“Reading Bug Reports” https://source.android.google.cn/setup/contribute/read-bug- reports bugreport

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• DroidKaigi 2017Ͱͻͨ͢ Βadbʹ͍ͭͯ࿩ͨ͠ͷͰ ڵຯ͋Δํ͸ͥͻʂ • https://speakerdeck.com/ operando/ komantonasitehokuhaan droidkai-fa-tekinaihua-1 ͦͷଞͷadbίϚϯυʹ͍ͭͯ

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ಡΈ͍ͨ໨తͷίʔυʹ 
 ͨͲΓணٕ͘ज़

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ಡΈ͍ͨ໨తͷίʔυʹͨͲΓணٕ͘ज़ • Android Framework͸ίʔυྔ͕๲େͳͷͰద౰ʹ୳ͯ͠ ΋ಡΈ͍ͨ໨తͷίʔυʹͨͲΓண͚ͳ͍😭 • ͖͞΄Ͳ঺հͨ͠αΠτ΍πʔϧΛར༻ͯ͠ 
 ಡΈ͍ͨ໨తͷίʔυʹͨͲΓண͘ํ๏ͷྫΛ঺հ

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ಡΈ͍ͨ໨తͷίʔυʹͨͲΓணٕ͘ज़ • Android Code SearchͷݕࡧΛ࢖͏ • LogcatͳͲγεςϜ͕ग़ྗ͢ΔϩάΛ࢖͏ • ΞϓϦ্ʹදࣔ͞ΕΔจࣈྻΛ࢖͏

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ಡΈ͍ͨ໨తͷίʔυʹͨͲΓணٕ͘ज़ • Android Code SearchͷݕࡧΛ࢖͏ • LogcatͳͲγεςϜ͕ग़ྗ͢ΔϩάΛ࢖͏ • ΞϓϦ্ʹදࣔ͞ΕΔจࣈྻΛ࢖͏

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Android Code SearchͷݕࡧΛ࢖͏ • ಡΈ͍ͨ໨తͷίʔυʹؔ࿈ͦ͠͏ͳϫʔυͰݕࡧ͢Δ • ͳΜͱͳ͘໨తͷίʔυͷ໨੕͕෇͍ͯΔ৔߹͸ 
 ͜Ε͕Ұ൪ૣ͍͔΋ • ݕࡧ݁Ռ͕ଟ͗͢Δ৔߹͸ɺݕࡧϑΟϧλʔΛ׆༻ͯ͠ 
 ݅਺Λߜ͍ͬͯ͘

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• ͖͞΄Ͳ঺հͨ͠Logcat ͷϩάόοϑΝαΠζΛ 
 ม͑Δ࣮૷Λ୳ͨ͠ྫ • languageϑΟϧλʔ͸ 
 ͓͢͢Ί ݕࡧϑΟϧλʔΛ׆༻ͯ݅͠਺ΛߜΔ

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“Rust in the Android platform” https://security.googleblog.com/2021/04/rust-in-android- platform.html AndroidͷRustͬͯͲ͜Ͱ࢖ΘΕͯΔͷʁ

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AndroidͷRustͬͯͲ͜Ͱ࢖ΘΕͯΔͷʁ

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ಡΈ͍ͨ໨తͷίʔυʹͨͲΓணٕ͘ज़ • Android Code SearchͷݕࡧΛ࢖͏ • LogcatͳͲγεςϜ͕ग़ྗ͢ΔϩάΛ࢖͏ • ΞϓϦ্ʹදࣔ͞ΕΔจࣈྻΛ࢖͏

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LogcatͳͲγεςϜ͕ग़ྗ͢ΔϩάΛ࢖͏ • खࠒͳͷ͸Logcatͷग़ྗΛ࢖͏΍Γํ • γεςϜ͕ग़ྗ͢Δϩά = ϩάग़ྗͷίʔυ͕ଘࡏ͢Δ • ग़ྗ͍ͯ͠ΔίʔυʹͨͲΓண͖ɺͦͷपลͷίʔυ͔Β ໨తͷίʔυ΁ͨͲΓண͚Δ͔୳͢

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͜ΜͳखॱͰϩάΛ࢖ͬͯίʔυΛ୳͢ 1. ಡΈ͍ͨ໨తͷίʔυʹؔ࿈͢Δૢ࡞Λߦ͏ 2. ૢ࡞1ʹΑΓग़ྗ͞ΕͨLogcat͔ΒಡΈ͍ͨίʔυʹ 
 ؔ࿈͢ΔϩάΛ୳͢ 3. ݟ͚ͭͨϩά͔ΒݻఆจࣈྻΛ୳͢ 4. ݟ͚ͭͨจࣈྻΛAndroid Code Search(ACS)Ͱݕࡧ͢Δ

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͜ΜͳखॱͰϩάΛ࢖ͬͯίʔυΛ୳͢ • ʮΞϓϦ͕ΞϯΠϯετʔϧ͞ΕΔ࣌ʹߦΘΕ͍ͯΔ͜ͱʯ ΛಡΈ͍ͨ໨తͷίʔυͱͯ͠ɺ۩ମతʹखॱΛઆ໌ • ࢿྉΛݟͳ͕ΒΈͳ͞ΜͷखݩͰ࣮ࡍʹ΍ͬͯΈΔ͜ͱΛ 
 ͓͢͢Ί͠·͢

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1. ಡΈ͍ͨ໨తͷίʔυʹؔ࿈͢Δૢ࡞Λߦ͏ • ૢ࡞࣌ͷϩά͕ݟ͍ͨͷͰɺLogcatίϚϯυΛ࣮ߦ͓ͯ͘͠ > ~ adb logcat -v time

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• ʮΞϓϦ͕ΞϯΠϯετʔϧ͞ ΕΔ࣌ʹߦΘΕ͍ͯΔ͜ͱʯΛ ஌Γ͍ͨͷͰɺ୺຤͔Βద౰ʹ ΞϓϦΛΞϯΠϯετʔϧ͢Δ • ͜Ε͕ʮಡΈ͍ͨ໨తͷίʔυ ʹؔ࿈͢Δૢ࡞ʯͰ͢ 1. ಡΈ͍ͨ໨తͷίʔυʹؔ࿈͢Δૢ࡞Λߦ͏

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2. ಡΈ͍ͨίʔυʹؔ࿈͢ΔϩάΛ୳͢ • ૢ࡞1ʹΑΓग़ྗ͞ΕͨLogcat͔ΒಡΈ͍ͨίʔυʹ 
 ؔ࿈͢ΔϩάΛ୳͢ • ஍ຯʹ໨grepྗ͕໰ΘΕΔ • ϩάग़ྗͷྔ͕ଟ͍ૢ࡞ͷ৔߹͸ϑΝΠϧʹॻ͖ग़্ͨ͠Ͱ ୳͢ํ͕͍͍

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• ؔ࿈ͦ͠͏ͳϩάൃݟ 2. ಡΈ͍ͨίʔυʹؔ࿈͢ΔϩάΛ୳͢

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UninstallerActivity(19960):Uninstallingextras=Bundle[{com.an droid.packageinstaller.extra.APP_LABEL=DroidKaigi2021,com. android.packageinstaller.applicationInfo=ApplicationInfo{5f5c cecio.github.droidkaigi.feeder.debug},android.intent.extra.UN INSTALL_ALL_USERS=false, com.android.packageinstaller.extra.UNINSTALL_ID=-2147483 643}] 
 I/ActivityManager( 1424): Force stopping io.github.droidkaigi.feeder.debug appid=10666 user=0: deletePackageX I/ActivityManager( 1424): Killing 23256:io.github.droidkaigi.feeder.debug/u0a666 (adj 940): stop io.github.droidkaigi.feeder.debug due to deletePackageX • ԫ৭෦෼͸ݻఆจࣈྻͬΆ͍ งғؾ • tagʢUninstallerActivityͷ ෦෼ʣ͸ݻఆจࣈྻͰίʔυ ্ʹఆٛ͞Ε͍ͯΔ͜ͱ͕ଟ ͍ͷͰݕࡧʹ࢖͍΍͍͢ 3. ݟ͚ͭͨϩά͔ΒݻఆจࣈྻΛ୳͢

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• ظ଴Ͳ͓Γ͍͍ײ͡ʹݕࡧ ʹҾ͔͔ͬΓ·ͨ͠ • ݕࡧʹώοτͨ͠ίʔυΛ ى఺ʹಡΈ͍ͨ໨తͷ 
 ίʔυΛ஍ಓʹ୳͢ 4. ݟ͚ͭͨจࣈྻΛACSͰݕࡧ͢Δ

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γεςϜ͕ग़ྗ͢ΔϩάͰ࢖͑ͦ͏ͳ΋ͷ • γεςϜαʔϏεͷίʔυΛಡΉͳΒdumpsysͷϩάΛ 
 ࢖͏ͷ͕͓͢͢Ί • ৭Μͳϩά͔Β୳͢ͳΒbugreportΛ࢖͏ͷ͕͓͢͢Ί • ಡΈ͍ͨίʔυʹΑͬͯ࢖͑Δϩά͸ଞʹ΋৭ʑ͋Δ

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ಡΈ͍ͨ໨తͷίʔυʹͨͲΓணٕ͘ज़ • Android Code SearchͷݕࡧΛ࢖͏ • LogcatͳͲγεςϜ͕ग़ྗ͢ΔϩάΛ࢖͏ • ΞϓϦ্ʹදࣔ͞ΕΔจࣈྻΛ࢖͏

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ΞϓϦ্ʹදࣔ͞ΕΔจࣈྻΛ࢖͏ 1. ಡΈ͍ͨ໨తͷίʔυʹؔ࿈͢ΔΞϓϦΛ୳͢ 2. ૢ࡞1Ͱݟ͚ͭͨΞϓϦͰಡΈ͍ͨίʔυʹ 
 ɹؔ࿈͢Δը໘Λ୳͢ 3. ݟ͚ͭͨը໘͔ΒݻఆจࣈྻΛ୳͢ 4. ݟ͚ͭͨจࣈྻΛAndroid Code Search(ACS)Ͱݕࡧ͢Δ

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• ʮΞϓϦ͕ڧ੍ఀࢭ͞ΕΔ࣌ʹߦΘΕΔ͜ͱʯ 
 ΛಡΈ͍ͨ໨తͷίʔυͱͯ͠ɺ۩ମతͳखॱΛઆ໌ • ࢿྉΛݟͳ͕ΒΈͳ͞ΜͷखݩͰ࣮ࡍʹ΍ͬͯΈΔ͜ͱΛ 
 ͓͢͢Ί͠·͢ ΞϓϦ্ʹදࣔ͞ΕΔจࣈྻΛ࢖͏

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• ʮΞϓϦ͕ڧ੍ఀࢭ͞ΕΔ࣌ʹߦΘΕΔ͜ͱʯ͕஌Γ͍ͨͷ ͰɺઃఆΞϓϦ͕ྑͦ͞͏ 1. ಡΈ͍ͨ໨తͷίʔυʹؔ࿈͢ΔΞϓϦΛ୳͢

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• ʮΞϓϦ͕ڧ੍ఀࢭ͞ΕΔ ࣌ʹߦΘΕΔ͜ͱʯ͕஌Γ ͍ͨͷͰɺઃఆΞϓϦͷ 
 ͜ͷը໘͕ྑͦ͞͏ 2. ಡΈ͍ͨίʔυʹؔ࿈͢Δը໘Λ୳͢

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• ʮڧ੍ఀࢭ͠·͔͢ʁʯ͸ ݻఆจࣈྻͬΆ͍ͷͰ 
 ݕࡧͷૉࡐʹ͠·͠ΐ͏ 3. ݟ͚ͭͨը໘͔ΒݻఆจࣈྻΛ୳͢

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• ݕࡧͯ͠ແࣄώοτ͠·ͨ͠ • ACS೔ຊޠͷݕࡧ΋໰୊ͳ͘ಈ͘ͷΑ͍ʂ 4. ݟ͚ͭͨจࣈྻΛACSͰݕࡧ͢Δ

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• ΞϓϦจݴ͸ݕࡧ͢Δͱߴ֬཰Ͱstrings.xml͕ώοτ͢Δ • ώοτͨ͠stringͷnameͰ͞Βʹݕࡧ͢Δ • nameͰݕࡧ͢Δͱදࣔͯ͠Δ࣮૷ʹͨͲΓண͘ • ͔ͦ͜ΒपลͷίʔυΛಡΜͰ͍͘ 4. ݟ͚ͭͨจࣈྻΛACSͰݕࡧ͢Δ

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• ͍͍ײ͡ʹݕࡧʹώοτͨ͠ • language:javaΛ͚ͭͯ stirngs.xml͕ݕࡧ݁Ռʹ 
 Ҿ͔͔ͬΒͳ͍Α͏ʹͯ͠Δ • ݕࡧʹώοτͨ͠ίʔυΛى఺ ʹಡΈ͍ͨ໨తͷ 
 ίʔυΛ஍ಓʹ୳͢ 4. ݟ͚ͭͨจࣈྻΛACSͰݕࡧ͢Δ

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Android FrameworkͰ 
 ΞϓϦ։ൃऀ͕खܰʹ 
 ಡΊͦ͏ͳίʔυͷ঺հ

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frameworks/ • Android Framework Layerશൠͷίʔυ • https://cs.android.com/android/platform/ superproject/+/master:frameworks/

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frameworks/base/services/core/ • γεςϜαʔϏεͷίʔυ • https://cs.android.com/android/platform/ superproject/+/master:frameworks/base/services/ core/

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frameworks/base/core/java/ • Android SDKશൠͷίʔυ • https://cs.android.com/android/platform/ superproject/+/master:frameworks/base/core/java/

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packages/apps/ • γεςϜΞϓϦશൠͷίʔυ • https://cs.android.com/android/platform/ superproject/+/master:packages/apps/

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ΞϓϦ։ൃऀ͕खܰʹಡΊͦ͏ͳίʔυ • Android Framework Layer͸C/C++ͷίʔυ΋Ұ෦͋Γ ·͕͢ɺJavaͷίʔυ΋ΊͬͪΌ͋ΔͷͰಡΈ๞͖Δ͜ͱ ͸ͳ͍ͱࢥ͍·͢ʂ

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Code Readingͷ݁ՌΛ 
 ·ͱΊΔ

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Code Readingͷ݁ՌΛ·ͱΊΔ • ·ͱΊͨ݁Ռ͸͖ͬͱ୭͔ͷ໾ʹཱͪ·͢☺ • ·ͱΊ͓ͯ͘ͱࣗ෼͕ݟฦ࣌͢ʹศར👍 • ·ͱΊͯͲ͔͜ʹެ։͓ͯ͘͠ͷ͕͓͢͢ΊͰ͢✨

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ • Code Readingͨ͠ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ • ॏཁͳ࣮૷෦෼͸ίʔυ෇͖ͰϝϞΔ + ίʔυͷϦϯΫΛ͚ͭΔ • ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛషΔ • Code Reading࠷தϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • ͦΕͧΕͷ޻ఔʹ͍ͭͯɺࢲ͕ҎલCode Readingͯ͠ 
 ݁ՌΛ·ͱΊͨهࣄΛྫʹઆ໌͠·͢ • ·ͱΊΔࡍͷࢀߟʹͳΕ͹ͱ✨

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“Android11͔Βಋೖ͞ΕͨAuto-reset permissionsΛௐ΂ͯΈͯΘ͔ͬͨ͜ͱ” https://hack-it-iron.hatenablog.com/entry/ 2020/12/14/081217 Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ • Code Readingͨ͠ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ • ॏཁͳ෦෼͸ίʔυͱίʔυ΁ͷϦϯΫΛهࡌ͢Δ • ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛهࡌ͢Δ • Code Reading࠷தϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ

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• ର৅͕ಛఆͷػೳͰ͋Ε͹ 
 ͦͷػೳͷ֓ཁΛهࡌ͢Δ • ֓ཁ͕ॻ͍ͯ͋ΔͱCode Readingͨ݁͠Ռͷ·ͱΊ ΋ཧղ͠΍͘͢ͳΔ Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ • Code Readingͨ͠ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ • ॏཁͳ෦෼͸ίʔυͱίʔυ΁ͷϦϯΫΛهࡌ͢Δ • ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛهࡌ͢Δ • Code Reading࠷தϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ

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• ཧ༝Λॻ͘ͱ໨తʹ͋ͬͨ 
 ίʔυΛಡΉ͜ͱʹ 
 ूதͰ͖Δ • Θ͔ͬͨ͜ͱͷཁ໿Λ 
 ॻ͘ͱ·ͱΊΛಡΈฦ͢ 
 ࡍʹศར ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ • Code Readingͨ͠ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ • ॏཁͳ෦෼͸ίʔυͱίʔυ΁ͷϦϯΫΛهࡌ͢Δ • ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛهࡌ͢Δ • Code Reading࠷தϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ

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• Code Readingͷ·ͱΊจ ষ͚ͩͰ఻͑Δͷ͸೉͍͠ • ࣮૷෦෼ͷίʔυ΋ަ͑ͯ ·ͱΊΔͷ͕͓͢͢Ί • ίʔυ΁ͷϦϯΫ΋Ұॹʹ ͋Δͱͳ͓Α͍👍 ίʔυͱίʔυ΁ͷϦϯΫΛهࡌ͢Δ

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ • Code Readingͨ͠ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ • ॏཁͳ෦෼͸ίʔυͱίʔυ΁ͷϦϯΫΛهࡌ͢Δ • ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛهࡌ͢Δ • Code Reading࠷தϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ

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• Code Reading͍ͯ͠Δத ͰࢀߟʹͳΓͦ͏ͳυΩϡ ϝϯτ͋Ε͹ɺඞཁͳͱ͜ ΖͰهࡌ͢Δ • ࢀߟϦϯΫूΈ͍ͨͳܗͰ ࠷ޙͷํʹ·ͱΊͯهࡌ 
 ͢Δͷ΋͋Γ ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛهࡌ͢Δ

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Code Readingͷ݁ՌΛͲ͏·ͱΊΔ͔ • Code Readingͨ͠ର৅ͷ֓ཁΛهࡌ͢Δ • Code Readingͨ͠ཧ༝ͱΘ͔ͬͨ͜ͱͷཁ໿Λهࡌ͢Δ • ॏཁͳ෦෼͸ίʔυͱίʔυ΁ͷϦϯΫΛهࡌ͢Δ • ࢀߟʹͳΔυΩϡϝϯτͷϦϯΫΛهࡌ͢Δ • Code ReadingதϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ

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• Code Reading͢Δ্Ͱ 
 ϝϞ͸େࣄ • ͪΐͬͱͨ͠ϝϞͰ΋ফͣ͞ ʹ࢒͓ͯ͘͠ • ·ͱΊͷ࠷ޙͷํʹϝϞΛ 
 ͦͷ··ࡶʹॻ͍͓͚ͯͩ͘ Ͱ΋Ձ஋͸͋Δ ϝϞΛ࢒͠ɺͦΕ΋ͬ͟ͱهࡌ͢Δ https://github.com/operando/JobScheduler-Code-Reading

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·ͱΊ

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·ͱΊ • Android Frameworkͷίʔυ͸ಡΉςΫχοΫΛ਎ʹ 
 ͚ͭΕ͹ɺΘΓͱ͢ΜͳΓಡΊΔΑ͏ʹͳΓ·͢💪 • ͨͩίʔυྔ͕๲େͳͷͰࠜؾڧ͞͸ඞཁͰ͢😅 • ಡΜͩΒ·ͱΊΛॻ͍ͯ஌ݟΛڞ༗͠·͠ΐ͏👍

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Thank you!

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͜ΕҎ߱͸ొஃ࣌ؒͷ౎߹Ͱ ࡟ͬͨεϥΠυू ʢ͓·͚ʣ

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Android Framework Code Readingͷ 
 ώϯτʹͳΔॻ੶ • AndroidΛࢧ͑Δٕज़ʪⅠʫ,ʪⅡʫ • Androidͷͳ͔Έ InsideAndroid

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Android FrameworkͷίʔυΛμ΢ϯϩʔυ͢Δ • Repoͱ͍͏πʔϧΛ࢖͏͜ͱͰμ΢ϯϩʔυͰ͖Δ • Android OSΛ։ൃ͢Δ্Ͱ͸ඞਢͳπʔϧ • ৭ʑେมͳͷͰຊฤͰͷ঺հΛආ͚ͨ😂 • https://source.android.google.cn/setup/build/ downloading

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adb-peco • ෳ਺AndroidσόΠε͕PCʹ઀ଓ͞Ε͍ͯΔ࣌ʹ 
 σόΠεબ୒Λࢧԉͯ͘͠ΕΔπʔϧ • https://github.com/tomorrowkey/adb-peco

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AIDEGen • Android Frameworkͷ։ൃΛIDEͰߦ͏ͨΊʹ৭ʑ΍ͬͯ ͘ΕΔπʔϧͬΆ͍ • https://android.googlesource.com/platform/tools/ asuite/+/refs/heads/master/aidegen/README.md • ࢖ͬͨ͜ͱͳ͍͚ͲɺࢿྉΛ࡞ͬͯΔաఔͰݟ͚ͭͨ

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AIDEGen https://codechacha.com/ja/android-aidegen/ “AIDEGenʹIDEͰAndroid Framework։ൃ”

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Session Buddy • Chrome Extension • https://sessionbuddy.com/ • ։͍ͯΔλϒΛλϒɾ΢Οϯυ΢ͷঢ়ଶΛอଘͰ͖Δ • Code Readingͯ͠ΔͱΊͬͪΌλϒ։͖·͘Δ • ಡΜͰΔঢ়ଶΛҰ୴อଘ͓͖͍ͯͨ͠৔߹ʹศར

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πϦʔܕλϒ • Firefox Add-ons • https://addons.mozilla.org/ja/ fi refox/addon/tree- style-tab/ • ಡΜͰ͍Δίʔυͷϝιουݺͼग़͠ͷ֊૚ͱ͔ΛπϦʔ ܕͷλϒͰ؅ཧ͢Δͷʹศར

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ͪΐͬͱੲ࿩ͱײँͷؾ࣋ͪ • ACS͕ެ։͞ΕΔલ͸༗ࢤʹΑΔӡӦͰɺOpenGrokͱ͍ ͏ιϑτ΢ΣΞΛ࢖ͬͯࣅͨ΋ͷ͕ߏங͞Ε͍ͯͨ • https://sites.google.com/site/devcollaboration/ codesearch • ͱͯ΋͓ੈ࿩ʹͳΓ·ͨ͠🙏͘͢͝ײँ͍ͯ͠·͢ʂ

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·ͬͨΓAndroid Framework Code Reading • AndroidͷιʔείʔυΛಡΜͰɺ։ൃ౳ʹ໾ཱͯΔษڧձΛ 
 ਺೥લ ࢲ͕ओ࠵ऀͰ΍͍ͬͯͨ • ࢀՃऀͷΈͳ͞Μ͕ಡΜͩίʔυΛ·ͱΊͨͷ͕GitHubʹ·ͱ·ͬͯΔ • Կ͔ͷࢀߟʹͳΕ͹ͱʂ • https://github.com/AndroidFrameworkCodeReading/ CodeReadingHistory