How to add templates

  1. Open Settings → Editor → Live Templates → Dart.
  2. Copy an XML template below, select the Dart group in the template list, and paste it with ⌘V on macOS or Ctrl+V on Windows/Linux. Click Apply.
  3. In an empty .dart file, type the abbreviation and press Tab. Enter ClassName; class_name is calculated with snakeCase(ClassName).

Dart live templates in Android Studio settings

The examples use Dart 3.13+ and Freezed 4. The BLoC and Freezed DTO templates use primary constructors. Events and states use abbreviated factory constructors. The project needs bloc, freezed_annotation, and json_annotation, with build_runner, freezed, and json_serializable as dev dependencies, depending on the templates you use.

For BLoC, create all three files below in the same directory and use the same ClassName in each template.

Freezed BLoC — frzbloc

<template name="frzbloc" value="import 'package:bloc/bloc.dart';&#10;import 'package:freezed_annotation/freezed_annotation.dart';&#10;&#10;part '$class_name$_bloc.freezed.dart';&#10;part '$class_name$_event.dart';&#10;part '$class_name$_state.dart';&#10;&#10;final class $ClassName$Bloc() extends Bloc&lt;$ClassName$Event, $ClassName$State&gt; {&#10;  this : super(const $ClassName$State.idle()) {&#10;    on&lt;_$ClassName$Started&gt;(_start);&#10;  }&#10;&#10;  void _start(_$ClassName$Started event, Emitter&lt;$ClassName$State&gt; emitter) {}&#10;}" description="Freezed BLoC" toReformat="true" toShortenFQNames="true">
  <variable name="ClassName" expression="" defaultValue="" alwaysStopAt="true" />
  <variable name="class_name" expression="snakeCase(ClassName)" defaultValue="" alwaysStopAt="false" />
  <context>
    <option name="DART_TOPLEVEL" value="true" />
  </context>
</template>

Result: ClassName = Counter, counter_bloc.dart.

import 'package:bloc/bloc.dart';
import 'package:freezed_annotation/freezed_annotation.dart';

part 'counter_bloc.freezed.dart';
part 'counter_event.dart';
part 'counter_state.dart';

final class CounterBloc() extends Bloc<CounterEvent, CounterState> {
  this : super(const CounterState.idle()) {
    on<_CounterStarted>(_start);
  }

  void _start(_CounterStarted event, Emitter<CounterState> emitter) {}
}

Freezed BLoC event — frzevent

<template name="frzevent" value="part of '$class_name$_bloc.dart';&#10;&#10;@Freezed(copyWith: false)&#10;sealed class $ClassName$Event with _$$$ClassName$Event {&#10;  const factory start() = _$ClassName$Started;&#10;}" description="Freezed BLoC event" toReformat="true" toShortenFQNames="true">
  <variable name="ClassName" expression="" defaultValue="" alwaysStopAt="true" />
  <variable name="class_name" expression="snakeCase(ClassName)" defaultValue="" alwaysStopAt="false" />
  <context>
    <option name="DART_TOPLEVEL" value="true" />
  </context>
</template>

Result: ClassName = Counter, counter_event.dart.

part of 'counter_bloc.dart';

@Freezed(copyWith: false)
sealed class CounterEvent with _$CounterEvent {
  const factory start() = _CounterStarted;
}

Freezed BLoC state — frzstate

<template name="frzstate" value="part of '$class_name$_bloc.dart';&#10;&#10;@Freezed()&#10;sealed class $ClassName$State with _$$$ClassName$State {&#10;  const factory idle() = $ClassName$Idle;&#10;&#10;  const factory processing() = $ClassName$Processing;&#10;&#10;  const factory success() = $ClassName$Success;&#10;&#10;  const factory failure() = $ClassName$Failure;&#10;}" description="Freezed BLoC state" toReformat="true" toShortenFQNames="true">
  <variable name="ClassName" expression="" defaultValue="" alwaysStopAt="true" />
  <variable name="class_name" expression="snakeCase(ClassName)" defaultValue="" alwaysStopAt="false" />
  <context>
    <option name="DART_TOPLEVEL" value="true" />
  </context>
</template>

Result: ClassName = Counter, counter_state.dart.

part of 'counter_bloc.dart';

@Freezed()
sealed class CounterState with _$CounterState {
  const factory idle() = CounterIdle;

  const factory processing() = CounterProcessing;

  const factory success() = CounterSuccess;

  const factory failure() = CounterFailure;
}

Freezed DTO — frzdto

<template name="frzdto" value="import 'package:freezed_annotation/freezed_annotation.dart';&#10;&#10;part '$class_name$.freezed.dart';&#10;part '$class_name$.g.dart';&#10;&#10;@Freezed(fromJson: false, toJson: false)&#10;@JsonSerializable(explicitToJson: true)&#10;class const $ClassName$({&#10;  required final String id,&#10;  final String? name,&#10;}) with _$$$ClassName$ {&#10;  factory $ClassName$.fromJson(Map&lt;String, Object?&gt; json) =&gt;&#10;      _$$$ClassName$FromJson(json);&#10;&#10;  Map&lt;String, Object?&gt; toJson() =&gt; _$$$ClassName$ToJson(this);&#10;}" description="Freezed DTO" toReformat="true" toShortenFQNames="true">
  <variable name="ClassName" expression="" defaultValue="" alwaysStopAt="true" />
  <variable name="class_name" expression="snakeCase(ClassName)" defaultValue="" alwaysStopAt="false" />
  <context>
    <option name="DART_TOPLEVEL" value="true" />
  </context>
</template>

Result: ClassName = UserDto, user_dto.dart.

import 'package:freezed_annotation/freezed_annotation.dart';

part 'user_dto.freezed.dart';
part 'user_dto.g.dart';

@Freezed(fromJson: false, toJson: false)
@JsonSerializable(explicitToJson: true)
class const UserDto({
  required final String id,
  final String? name,
}) with _$UserDto {
  factory UserDto.fromJson(Map<String, Object?> json) =>
      _$UserDtoFromJson(json);

  Map<String, Object?> toJson() => _$UserDtoToJson(this);
}

json_serializable DTO — jsondto

<template name="jsondto" value="import 'package:json_annotation/json_annotation.dart';&#10;&#10;part '$class_name$.g.dart';&#10;&#10;@JsonSerializable(explicitToJson: true)&#10;class $ClassName$ {&#10;  const $ClassName$({&#10;    required this.id,&#10;    this.name,&#10;  });&#10;&#10;  factory $ClassName$.fromJson(Map&lt;String, Object?&gt; json) =&gt;&#10;      _$$$ClassName$FromJson(json);&#10;&#10;  final String id;&#10;  final String? name;&#10;&#10;  Map&lt;String, Object?&gt; toJson() =&gt; _$$$ClassName$ToJson(this);&#10;}" description="json_serializable DTO" toReformat="true" toShortenFQNames="true">
  <variable name="ClassName" expression="" defaultValue="" alwaysStopAt="true" />
  <variable name="class_name" expression="snakeCase(ClassName)" defaultValue="" alwaysStopAt="false" />
  <context>
    <option name="DART_TOPLEVEL" value="true" />
  </context>
</template>

Result: ClassName = UserDto, user_dto.dart.

import 'package:json_annotation/json_annotation.dart';

part 'user_dto.g.dart';

@JsonSerializable(explicitToJson: true)
class UserDto {
  const UserDto({
    required this.id,
    this.name,
  });

  factory UserDto.fromJson(Map<String, Object?> json) =>
      _$UserDtoFromJson(json);

  final String id;
  final String? name;

  Map<String, Object?> toJson() => _$UserDtoToJson(this);
}

After creating the files, generate the .freezed.dart and .g.dart parts:

dart run build_runner build