Dart: Migrate to null safety

[manjotsidhu]

Describe the bug
We should be migrating to null safety which was introduced in Dart 2.0. But before that, we need to make sure that first our dependencies are migrated to null safety according to this Guide: https://dart.dev/null-safety/migration-guide

Wait for the packages that you depend on to migrate.
Migrate your package’s code, preferably using the interactive migration tool.
Statically analyze your package’s code.
Test to make sure your changes work.
If the package is already on pub.dev, publish the null-safe version as a prerelease version.

This Issue serves as a checklist of all the packages which have been migrated to null safety.

• animations
• cupertino_icons
• datetime_picker_formfield
• flutter_facebook_auth
• flutter_html
• [Null Safety] swap flutter_icons with fluttericon #119
• flutter_keyboard_visibility
• flutter_summernote (published on 21st June)
• flutter_svg
• flutter_typeahead
• get
• get_it
• google_sign_in
• html
• http
• intl
• mockito
• oauth2_client
• photo_view
• provider
• share
• shared_preferences
• theme_provider
• timeago
• transparent_image
• url_launcher

Once this list is complete which means all our packages are sound null safety. We should use migration tool to migrate to null safety.

[manjotsidhu]

@Nitish145 flutter_icons is not maintained anymore, can we switch to fluttericon:https://pub.dev/packages/fluttericon ?

[Nitish145]

Go Ahead @manjotsidhu

[manjotsidhu]

@Nitish145 flutter_icons is not maintained anymore, can we switch to fluttericon:https://pub.dev/packages/fluttericon ?

@ShreyaPrasad1209 this can also be considered as #good-first-issue.

[Mobasherah12]

@manjotsidhu @ShreyaPrasad1209 Hi, I'm an Open Source Day participant, willing to work on this. Please do assign me.

[manjotsidhu]

@manjotsidhu @ShreyaPrasad1209 Hi, I'm an Open Source Day participant, willing to work on this. Please do assign me.

Go ahead!

[prasadsunny1]

What more needs to be done in this issue?

[manjotsidhu]

What more needs to be done in this issue?

https://dart.dev/null-safety/migration-guide

[prasadsunny1]

Let me try migrating

[prasadsunny1]

#156
I have started working but am stuck at some errors in migrating testcases

[aman-singh7]

@manjotsidhu can I work on this?