packages/shared_preferences/shared_preferences_android/lib/shared_preferences_android.dart

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:flutter/services.dart';
import 'package:shared_preferences_platform_interface/shared_preferences_platform_interface.dart';

const MethodChannel _kChannel =
    MethodChannel('plugins.flutter.io/shared_preferences_android');

/// The Android implementation of [SharedPreferencesStorePlatform].
///
/// This class implements the `package:shared_preferences` functionality for Android.
class SharedPreferencesAndroid extends SharedPreferencesStorePlatform {
  /// Registers this class as the default instance of [SharedPreferencesStorePlatform].
  static void registerWith() {
    SharedPreferencesStorePlatform.instance = SharedPreferencesAndroid();
  }

  static const String _defaultPrefix = 'flutter.';

  @override
  Future<bool> remove(String key) async {
    return (await _kChannel.invokeMethod<bool>(
      'remove',
      <String, dynamic>{'key': key},
    ))!;
  }

  @override
  Future<bool> setValue(String valueType, String key, Object value) async {
    return (await _kChannel.invokeMethod<bool>(
      'set$valueType',
      <String, dynamic>{'key': key, 'value': value},
    ))!;
  }

  @override
  Future<bool> clear() async {
    return clearWithPrefix(_defaultPrefix);
  }

  @override
  Future<bool> clearWithPrefix(String prefix) async {
    return (await _kChannel.invokeMethod<bool>(
      'clearWithPrefix',
      <String, dynamic>{'prefix': prefix},
    ))!;
  }

  @override
  Future<Map<String, Object>> getAll() async {
    return getAllWithPrefix(_defaultPrefix);
  }

  @override
  Future<Map<String, Object>> getAllWithPrefix(String prefix) async {
    return (await _kChannel.invokeMapMethod<String, Object>(
          'getAllWithPrefix',
          <String, dynamic>{'prefix': prefix},
        )) ??
        <String, Object>{};
  }
}