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Android OS Architecture @Alex_Zhukovich

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https://en.wikipedia.org/wiki/Andy_Rubin https://www.gv.com/team/rich-miner http://www.seriousbiz.com https://andro4all.com/2018/03/creadores-android-actualidad

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https://en.wikipedia.org/wiki/Google_logo https://opensource.org https://en.wikipedia.org/wiki/Open_Handset_Alliance

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Android versions ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●

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Android Architecture

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Kernel level

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Hardware abstraction layer

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Native libraries

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Android Runtime

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Application framework

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Application layer

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Dalvik vs ART

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Why do we need a Virtual Machine? VM

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Compilation JVM vs DVM Java Compiler (javac) Java Source Code (*.java) Java Bytecode (*.class) Java Virtual Machine Java Source Code (*.java) Java Bytecode (*.class) Dalvik Virtual Machine Dalvik Bytecode (*.dex) DEX Compiler Java Compiler (javac)

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Dalvik (Just In Time) vs ART (Ahead of Time) Installing Run Running... Compile Installing Run Running... Compile

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ART Benefits: ● ● ● Drawbacks: ● ●

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Security

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UID/GID - Linux

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UID/GID - Linux

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UID/GID - Android https://android.googlesource.com/platform/frameworks/base/+/master/data/etc/platform.xml

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Resources

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Sharing data and resources between applications

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Sharing data and resources between applications android:sharedUserId="com.example.test.sharedUID"

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Sharing data and resources between applications android:sharedUserId="com.example.test.sharedUID"

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SharedPreferences isolation

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SharedPreferences isolation /data/data/package_name/shared_prefs/

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/data/data/package_name/shared_prefs/prefs val sharedPreferences = getSharedPreferences( "prefs", Context.MODE_PRIVATE) sharedPreferences .edit() .putInt( "theme", 0) .apply()

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Database isolation /data/data/package_name/databases/

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Trends

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Q&A 1. 2.