Flutter近距离屏幕锁定插件proximity_screen_lock_default的使用

proximity_screen_lock_default 是一个 Flutter 插件，可以用来将屏幕激活与接近传感器绑定。默认情况下，该插件假定设备上没有接近传感器。

要激活该行为，可以使用以下代码：

if (ProximityLockScreen.isProximityLockSupported()) {
  ProximityLockScreen.setActive(true);
}

ProximityLockScreen.isProximityLockAvailable() 将在不提供接近传感器的 Android 设备上返回 false。它也会在非移动设备上返回 false。

示例代码

以下是使用 proximity_screen_lock_default 插件的完整示例代码：

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:proximity_screen_lock_default/proximity_screen_lock_default.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _proximityScreenLock = ProximityScreenLockDefault();
  var isActive = false;

  [@override](/user/override)
  void initState() {
    super.initState();
    setProximitySensorActive();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> setProximitySensorActive() async {
    try {
      await _proximityScreenLock.setActive(isActive);
    } catch (e) {
      debugPrint('Something went wrong: $e');
    }
  }

  void toggle() {
    setState(() => isActive = !isActive);
    setActive(isActive);
  }

  void setActive(bool value) {
    _proximityScreenLock.setActive(value);
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: TextButton(
            onPressed: toggle,
            child: Text(
              isActive ? 'De-activate' : 'Activate',
            ),
          ),
        ),
      ),
    );
  }
}

代码说明

1. 导入必要的库：

   import 'dart:async';
   import 'package:flutter/material.dart';
   import 'package:proximity_screen_lock_default/proximity_screen_lock_default.dart';
   

2. 定义主应用类 MyApp：

   class MyApp extends StatefulWidget {
     const MyApp({Key? key}) : super(key: key);
   
     [@override](/user/override)
     State<MyApp> createState() => _MyAppState();
   }
   

3. 定义状态类 _MyAppState：

   class _MyAppState extends State<MyApp> {
     final _proximityScreenLock = ProximityScreenLockDefault();
     var isActive = false;
   

4. 初始化方法 initState：

   [@override](/user/override)
   void initState() {
     super.initState();
     setProximitySensorActive();
   }
   

5. 异步方法 setProximitySensorActive：

   Future<void> setProximitySensorActive() async {
     try {
       await _proximityScreenLock.setActive(isActive);
     } catch (e) {
       debugPrint('Something went wrong: $e');
     }
   }
   

6. 切换激活状态的方法 toggle 和 setActive：

   void toggle() {
     setState(() => isActive = !isActive);
     setActive(isActive);
   }
   
   void setActive(bool value) {
     _proximityScreenLock.setActive(value);
   }
   

7. 构建应用界面：

   [@override](/user/override)
   Widget build(BuildContext context) {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(
           title: const Text('Plugin example app'),
         ),
         body: Center(
           child: TextButton(
             onPressed: toggle,
             child: Text(
               isActive ? 'De-activate' : 'Activate',
             ),
           ),
         ),
       ),
     );
   }