Add Android Support

[pentazoe]

Thank You for sharing such a nice and awaited feature

Description of the issue :
Currently it seems that it doesn't support Android
It doesn't let change "Animation Export Directory" of the "Animation Retargeting" Node from res:// which is not accessable when exported to Mobile Platform

[smix8]

I have to admit I have zero Android experience. I don't use it at all and have not a single android device to test so I never considered Android support.

That said, this doesn't mean that I wouldn't support it, if other people test it and tell me what is required to make it work for them.

Animation Export Directory is currently hardcoded to be a "res://" path but this can be changed. Is there any use case with exporting animations at runtime on Android? Last time I tested animations stored outside of the "res://" system they wouldn't work correctly on the exported game (the reason why "res://" path was hardcoded).

[smix8]

Removed the hardcoded Animation Export Directory restrictions.
godot_3.x commit ef9a376
godot_4.x commit b9b10c5
godot_3.x_gdscript commit 8378848

[pentazoe]

Getting few errors on Android

04-27 04:04:17.617  5899  6002 E godot   : **ERROR**: Condition "!p_dst" is true. Returned: -1
04-27 04:04:17.617  5899  6002 E godot   :    At: platform/android/file_access_android.cpp:128:get_buffer() - Condition "!p_dst" is true. Returned: -1
04-27 04:04:17.872  5899  6002 E godot   : **ERROR**: Condition "!p_dst" is true. Returned: -1
04-27 04:04:17.872  5899  6002 E godot   :    At: platform/android/file_access_android.cpp:128:get_buffer() - Condition "!p_dst" is true. Returned: -1
04-27 04:04:17.876  5899  6002 E godot   : **ERROR**: Cannot get class 'AnimationRetargeting'.
04-27 04:04:17.876  5899  6002 E godot   :    At: core/class_db.cpp:1342:is_class_enabled() - Condition "!ti" is true. Returned: false
04-27 04:04:17.876  5899  6002 E godot   : **WARNING**: Node AnimationRetargeting of type AnimationRetargeting cannot be created. A placeholder will be created instead.
04-27 04:04:17.876  5899  6002 E godot   :    At: scene/resources/packed_scene.cpp:168:instance() - Node AnimationRetargeting of type AnimationRetargeting cannot be created. A placeholder will be created instead.
04-27 04:04:22.803  2059 10263 I PackageManager.DexOptimizer: Running dexopt (dexoptNeeded=1) on: /data/app/org.godotengine.test-HLE9AYJjjV8zP1jMc0oTJA==/base.apk pkg=org.godotengine.test isa=arm64 dexoptFlags=boot_complete,debuggable,public,enable_hidden_api_checks targetFilter=quicken oatDir=/data/app/org.godotengine.test-HLE9AYJjjV8zP1jMc0oTJA==/oat classLoaderContext=PCL[]
04-27 04:04:22.804  1280  2240 V installd: DexInv: --- BEGIN '/data/app/org.godotengine.test-HLE9AYJjjV8zP1jMc0oTJA==/base.apk' ---
04-27 04:04:22.863  6206  6206 I dex2oat : /apex/com.android.runtime/bin/dex2oat --input-vdex-fd=-1 --output-vdex-fd=11 --call-from-installd=1 --resolve-startup-const-strings=true --max-image-block-size=524288 --compiler-filter=quicken -j6 --debuggable --classpath-dir=/data/app/org.godotengine.test-HLE9AYJjjV8zP1jMc0oTJA== --class-loader-context=PCL[] --generate-mini-debug-info --compilation-reason=unknown
04-27 04:04:24.060  1280  2240 V installd: DexInv: --- END '/data/app/org.godotengine.test-HLE9AYJjjV8zP1jMc0oTJA==/base.apk' (success) ---
04-27 04:04:24.061  2059 10263 I PackageManagerServiceInjector: FirstUseActivity Pinning optimized code org.godotengine.test

[smix8]

Android seems to require different build parameters. So far I couldn't find something valuable for this error or how to fix it. Maybe if someone from the Android crowd moves by and knows what to do that would be great.

[smix8]

Added to the feature tracker.