Why are APK files so small?

Android projects (in general) contain source code, which gets compiled to class files that end up in the APK. Compiled files are smaller than the source code – for example they strip all the comments out of the file (you do include comments in your source files don’t you!)

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How do I know the size of my APK?

Drag an APK or app bundle into the Editor window of Android Studio. Switch to the Project perspective in the Project window and then double-click the APK in the default build/output/apks/ directory. Select Build > Analyze APK in the menu bar and then select your APK or app bundle.

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What is APK size and download size?

Raw File Size represents the unzipped size of the entity on disk while Download Size represents the estimated compressed size of the entity as it would be delivered by Google Play . The % of Total Download Size indicates the percentage of the APK’s total download size the entity represents.

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