Migrate to null safety

analysis_options.yaml

@@ -0,0 +1,228 @@
+# Specify analysis options.
+#
+# Until there are meta linter rules, each desired lint must be explicitly enabled.
+# See: https://github.com/dart-lang/linter/issues/288
+#
+# For a list of lints, see: http://dart-lang.github.io/linter/lints/
+# See the configuration guide for more
+# https://github.com/dart-lang/sdk/tree/master/pkg/analyzer#configuring-the-analyzer
+#
+# There are other similar analysis options files in the flutter repos,
+# which should be kept in sync with this file:
+#
+#   - analysis_options.yaml (this file)
+#   - packages/flutter/lib/analysis_options_user.yaml
+#   - https://github.com/flutter/plugins/blob/master/analysis_options.yaml
+#   - https://github.com/flutter/engine/blob/master/analysis_options.yaml
+#
+# This file contains the analysis options used by Flutter tools, such as IntelliJ,
+# Android Studio, and the `flutter analyze` command.
+
+analyzer:
+  strong-mode:
+    implicit-casts: false
+  errors:
+    # treat missing required parameters as a warning (not a hint)
+    missing_required_param: warning
+    # treat missing returns as a warning (not a hint)
+    missing_return: warning
+    # allow having TODOs in the code
+    todo: ignore
+    # allow self-reference to deprecated members (we do this because otherwise we have
+    # to annotate every member in every test, assert, etc, when we deprecate something)
+    deprecated_member_use_from_same_package: ignore
+    # Ignore analyzer hints for updating pubspecs when using Future or
+    # Stream and not importing dart:async
+    # Please see https://github.com/flutter/flutter/pull/24528 for details.
+    sdk_version_async_exported_from_core: ignore
+    # Turned off until null-safe rollout is complete.
+    unnecessary_null_comparison: ignore
+  exclude:
+    - "bin/cache/**"
+  enable-experiment:
+    - non-nullable
+
+linter:
+  rules:
+    # these rules are documented on and in the same order as
+    # the Dart Lint rules page to make maintenance easier
+    # https://github.com/dart-lang/linter/blob/master/example/all.yaml
+    - always_declare_return_types
+    - always_put_control_body_on_new_line
+    # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    # - always_use_package_imports # we do this commonly
+    - annotate_overrides
+    # - avoid_annotating_with_dynamic # conflicts with always_specify_types
+    - avoid_bool_literals_in_conditional_expressions
+    # - avoid_catches_without_on_clauses # we do this commonly
+    # - avoid_catching_errors # we do this commonly
+    - avoid_classes_with_only_static_members
+    # - avoid_double_and_int_checks # only useful when targeting JS runtime
+    # - avoid_dynamic_calls # not yet tested
+    - avoid_empty_else
+    - avoid_equals_and_hash_code_on_mutable_classes
+    # - avoid_escaping_inner_quotes # not yet tested
+    - avoid_field_initializers_in_const_classes
+    - avoid_function_literals_in_foreach_calls
+    # - avoid_implementing_value_types # not yet tested
+    - avoid_init_to_null
+    # - avoid_js_rounded_ints # only useful when targeting JS runtime
+    - avoid_null_checks_in_equality_operators
+    # - avoid_positional_boolean_parameters # not yet tested
+    # - avoid_print # not yet tested
+    # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
+    # - avoid_redundant_argument_values # not yet tested
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    # - avoid_returning_null # there are plenty of valid reasons to return null
+    # - avoid_returning_null_for_future # not yet tested
+    - avoid_returning_null_for_void
+    # - avoid_returning_this # there are plenty of valid reasons to return this
+    # - avoid_setters_without_getters # not yet tested
+    - avoid_shadowing_type_parameters
+    - avoid_single_cascade_in_expression_statements
+    - avoid_slow_async_io
+    - avoid_type_to_string
+    - avoid_types_as_parameter_names
+    # - avoid_types_on_closure_parameters # conflicts with always_specify_types
+    - avoid_unnecessary_containers
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    # - avoid_web_libraries_in_flutter # not yet tested
+    - await_only_futures
+    - camel_case_extensions
+    - camel_case_types
+    - cancel_subscriptions
+    # - cascade_invocations # not yet tested
+    - cast_nullable_to_non_nullable
+    # - close_sinks # not reliable enough
+    # - comment_references # blocked on https://github.com/dart-lang/linter/issues/1142
+    # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
+    - control_flow_in_finally
+    # - diagnostic_describe_all_properties # not yet tested
+    - directives_ordering
+    # - do_not_use_environment # we do this commonly
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    - exhaustive_cases
+    - file_names
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    # - invariant_booleans # too many false positives: https://github.com/dart-lang/linter/issues/811
+    - iterable_contains_unrelated_type
+    # - join_return_with_assignment # not required by flutter style
+    - leading_newlines_in_multiline_strings
+    - library_names
+    - library_prefixes
+    # - lines_longer_than_80_chars # not required by flutter style
+    - list_remove_unrelated_type
+    # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
+    - missing_whitespace_between_adjacent_strings
+    - no_adjacent_strings_in_list
+    # - no_default_cases # too many false positives
+    - no_duplicate_case_values
+    - no_logic_in_create_state
+    # - no_runtimeType_toString # ok in tests; we enable this only in packages/
+    - non_constant_identifier_names
+    - null_check_on_nullable_type_parameter
+    - null_closures
+    # - omit_local_variable_types # opposite of always_specify_types
+    # - one_member_abstracts # too many false positives
+    # - only_throw_errors # https://github.com/flutter/flutter/issues/5792
+    - overridden_fields
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    # - parameter_assignments # we do this commonly
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    # - prefer_asserts_with_message # not required by flutter style
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    # - prefer_constructors_over_static_methods # far too many false positives
+    - prefer_contains
+    # - prefer_double_quotes # opposite of prefer_single_quotes
+    - prefer_equal_for_default_values
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
+    - prefer_final_fields
+    - prefer_final_in_for_each
+    - prefer_final_locals
+    - prefer_for_elements_to_map_fromIterable
+    - prefer_foreach
+    - prefer_function_declarations_over_variables
+    - prefer_generic_function_type_aliases
+    - prefer_if_elements_to_conditional_expressions
+    - prefer_if_null_operators
+    - prefer_initializing_formals
+    - prefer_inlined_adds
+    # - prefer_int_literals # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#use-double-literals-for-double-constants
+    # - prefer_interpolation_to_compose_strings # doesn't work with raw strings, see https://github.com/dart-lang/linter/issues/2490
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_is_not_operator
+    - prefer_iterable_whereType
+    # - prefer_mixin # https://github.com/dart-lang/language/issues/32
+    - prefer_null_aware_operators
+    # - prefer_relative_imports # incompatible with sub-package imports
+    - prefer_single_quotes
+    - prefer_spread_collections
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    - provide_deprecation_message
+    # - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
+    - recursive_getters
+    - sized_box_for_whitespace
+    - slash_for_doc_comments
+    # - sort_child_properties_last # not yet tested
+    - sort_constructors_first
+    # - sort_pub_dependencies # prevents separating pinned transitive dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    - tighten_type_of_initializing_formals
+    # - type_annotate_public_apis # subset of always_specify_types
+    - type_init_formals
+    # - unawaited_futures # too many false positives
+    - unnecessary_await_in_return
+    - unnecessary_brace_in_string_interps
+    - unnecessary_const
+    # - unnecessary_final # conflicts with prefer_final_locals
+    - unnecessary_getters_setters
+    # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    # - unnecessary_null_checks # not yet tested
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_nullable_for_final_variable_declarations
+    - unnecessary_overrides
+    - unnecessary_parenthesis
+    # - unnecessary_raw_strings # not yet tested
+    - unnecessary_statements
+    - unnecessary_string_escapes
+    - unnecessary_string_interpolations
+    - unnecessary_this
+    - unrelated_type_equality_checks
+    # - unsafe_html # not yet tested
+    - use_full_hex_values_for_flutter_colors
+    - use_function_type_syntax_for_parameters
+    # - use_if_null_to_convert_nulls_to_bools # not yet tested
+    - use_is_even_rather_than_modulo
+    - use_key_in_widget_constructors
+    - use_late_for_private_fields_and_variables
+    # - use_named_constants # not yet tested
+    - use_raw_strings
+    - use_rethrow_when_possible
+    # - use_setters_to_change_properties # not yet tested
+    # - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
+    # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
+    - valid_regexps
+    - void_checks

example/android/app/src/main/AndroidManifest.xml

@@ -30,6 +30,9 @@
             <meta-data
                 android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                 android:value="true" />
+            <meta-data
+                android:name="flutterEmbedding"
+                android:value="2" />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

example/android/app/src/main/java/com/realank/example/MainActivity.java

@@ -1,13 +1,15 @@
 package com.realank.example;
 
 import android.os.Bundle;
-import io.flutter.app.FlutterActivity;
+
+import io.flutter.embedding.android.FlutterActivity;
+import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.plugins.GeneratedPluginRegistrant;
 
 public class MainActivity extends FlutterActivity {
-  @Override
-  protected void onCreate(Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
-    GeneratedPluginRegistrant.registerWith(this);
-  }
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        GeneratedPluginRegistrant.registerWith(new FlutterEngine(this));
+    }
 }

example/android/build.gradle

@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.2'
+        classpath 'com.android.tools.build:gradle:4.1.3'
     }
 }
 

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Thu Nov 21 17:00:56 IST 2019
+#Thu Apr 01 12:53:12 HKT 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip

example/ios/Flutter/flutter_export_environment.sh

@@ -1,15 +1,13 @@
 #!/bin/sh
 # This is a generated file; do not edit or check into version control.
-export "FLUTTER_ROOT=/Users/liuyanbo/flutter"
-export "FLUTTER_APPLICATION_PATH=/Users/liuyanbo/Documents/GitHub/flutter_datetime_picker/example"
-export "FLUTTER_TARGET=/Users/liuyanbo/Documents/GitHub/flutter_datetime_picker/example/lib/main.dart"
+export "FLUTTER_ROOT=/Users/felixmo/flutter"
+export "FLUTTER_APPLICATION_PATH=/Users/felixmo/Desktop/trustME/sample/flutter_datetime_picker/example"
+export "FLUTTER_TARGET=lib/main.dart"
 export "FLUTTER_BUILD_DIR=build"
 export "SYMROOT=${SOURCE_ROOT}/../build/ios"
-export "OTHER_LDFLAGS=$(inherited) -framework Flutter"
-export "FLUTTER_FRAMEWORK_DIR=/Users/liuyanbo/flutter/bin/cache/artifacts/engine/ios"
 export "FLUTTER_BUILD_NAME=1.0.0"
 export "FLUTTER_BUILD_NUMBER=1"
 export "DART_OBFUSCATION=false"
-export "TRACK_WIDGET_CREATION=true"
+export "TRACK_WIDGET_CREATION=false"
 export "TREE_SHAKE_ICONS=false"
 export "PACKAGE_CONFIG=.packages"