Unity 4.6+ How to reduce .apk size

Hello,

I have just downloaded Android SDK, and tried to build a simple app, so I created new project, saved the default scene and made a build. The scene contains just the camera and nothing more, there are no assets or scripts in the project, just basic empty project without any packages imported. What I got was 14,1MB .apk file… I tried doing the same in older version of unity (4.2) and got 7,82MB .apk file.

So my questions is, how can I reduce .apk size in latest(as for now it’s 4.6.2f1) version of unity, apparently there were changes in engine since v4.2 but 14MB is way too much.

Output logs from different versions:

Unity 4.2

Textures      0.0 kb	 0.0% 
Meshes        0.0 kb	 0.0% 
Animations    0.0 kb	 0.0% 
Sounds        0.0 kb	 0.0% 
Shaders       0.0 kb	 0.0% 
Other Assets  0.0 kb	 0.0% 
Levels        8.9 kb	 0.2% 
Scripts       0.0 kb	 0.0% 
Included DLLs 3.7 mb	 99.5% 
File headers  8.1 kb	 0.2% 
Complete size 3.7 mb	 100.0% 

Unity 4.6.2f1

Textures      0.0 kb	 0.0% 
Meshes        0.0 kb	 0.0% 
Animations    0.0 kb	 0.0% 
Sounds        0.0 kb	 0.0% 
Shaders       0.0 kb	 0.0% 
Other Assets  0.0 kb	 0.0% 
Levels        9.6 kb	 0.2% 
Scripts       170.9 kb	 4.1% 
Included DLLs 3.9 mb	 95.5% 
File headers  8.2 kb	 0.2% 
Complete size 4.1 mb	 100.0% 

Used Assets, sorted by uncompressed size:
 3.4 kb	 0.1% D:/Program Files (x86)/Unity/Editor/Data/UnityExtensions/Unity/GUISystem/4.6.2/UnityEngine.UI.dll
AndroidSDKTools:

	root          : D:/android-sdk

	tools         : D:/android-sdk	ools

	platform-tools: D:/android-sdk\platform-tools

	build-tools   : D:\android-sdk\build-tools\21.1.2

	adb      : D:/android-sdk\platform-tools\adb.exe

	aapt     : D:\android-sdk\build-tools\21.1.2\aapt.exe

	zipalign : D:\android-sdk\build-tools\21.1.2\zipalign.exe

	java     : java.exe

Both output logs say that complete size is about 4MB.
I know that Unity Engine and Player files take some space but where additional 10MB come from?

Ok …Just go to Project Setting–>Player

Make sure you have selected Device Filter to ARM 7 only

Because in unity 4.6 the build supports both x86 and ARM 7 by default . So its a bit fat.

Select ARM 7 and you are good to go

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Hope this helps you

you can get some points regarding to optimization from this video :