Flutter: What are the factors of app size? (FAQ) - flutter

Question

I'm working on my flutter app, and the most recent size report I got is: 219 MB,
by running this command:
flutter build apk --analyze-size --target-platform=android-arm64
clearly, 219 MB size is TOO BIG for me, although I did checked out some tutorials online to reduce the app size, but none of seem effective, so I decided to REALLY dive into this topic, and here are my questions:
Does adding more packages to my app really increase my app size?
If the packages are the same, but I import them to more files, does that effect my app size?
If I increase my widgets and screens, does that increase the app size?
If numbers of widgets are the same, but I sperate (extract widget) them into different files, will the app size increase?
Does the app size that the command returns (above) really reflect my app size in the real world when I publish it?
What are the factors of app size (numbers of widgets, files, or packages)
And here is the analysis:
✓ Built build/app/outputs/flutter-apk/app-release.apk (219.5MB).
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
app-release.apk (total compressed) 219 MB
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
res/
interpolator 1 KB
drawable-hdpi-v4 21 KB
drawable-xxhdpi-v4 33 KB
drawable 16 KB
drawable-xhdpi-v4 25 KB
drawable-mdpi-v4 16 KB
drawable-xxxhdpi-v4 26 KB
color-v23 2 KB
color 3 KB
anim 8 KB
layout 21 KB
drawable-anydpi-v21 2 KB
drawable-ldrtl-xxxhdpi-v17 2 KB
layout-v21 2 KB
drawable-v21 2 KB
drawable-ldrtl-xhdpi-v17 1 KB
drawable-ldrtl-xxhdpi-v17 1 KB
layout-watch-v20 1020 B
mipmap-xxxhdpi-v4 1 KB
raw 1 MB
META-INF/
CERT.SF 34 KB
kotlin-stdlib.kotlin_module 1 KB
CERT.RSA 1016 B
MANIFEST.MF 31 KB
lib/
x86 45 MB
armeabi-v7a 58 MB
arm64-v8a 59 MB
Dart AOT symbols accounted decompressed size 8 MB
package:flutter 3 MB
package:cheese 605 KB
dart:core 389 KB
package:rive 320 KB
dart:io 278 KB
dart:typed_data 265 KB
dart:ui 247 KB
dart:collection 189 KB
dart:async 177 KB
package:flutter_svg 143 KB
package:just_audio/
just_audio.dart 77 KB
dart:convert 76 KB
package:sqflite_common 70 KB
package:vector_math 66 KB
package:petitparser 65 KB
package:photo_view 59 KB
package:source_span 58 KB
package:xml 52 KB
package:cloud_firestore_platform_interface 51 KB
package:rxdart 46 KB
x86_64 52 MB
kotlin/
reflect 2 KB
collections 1 KB
kotlin.kotlin_builtins 4 KB
assets/
flutter_assets 237 KB
IAgoraMediaEngine.h 7 KB
AgoraBase.h 8 KB
IAgoraRtcEngine.h 85 KB
IAgoraRtcChannel.h 16 KB
google/
protobuf 21 KB
resources.arsc 405 KB
okhttp3/
internal 33 KB
AndroidManifest.xml 4 KB
classes2.dex 747 KB
classes.dex 3 MB
I have tons of widgets but I have no idea how to reduce any of them, so PLEASE HELP!!!