Flutter禁用截图插件disable_screenshots的使用

在Flutter开发中，有时我们需要对App的内容进行管控，避免敏感信息暴露，所以开发了这个插件。此插件提供三个禁用截屏的相关功能，分别是：截屏监控行为、全局添加水印、禁用截屏（仅支持Android）。

Getting Started

Add dependency

在你的pubspec.yaml文件中添加依赖：

dependencies:
  disable_screenshots: 0.0.1 #latest version

功能演示

使用样例

import 'dart:math';

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

import 'package:disable_screenshots/disable_screenshots.dart';

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

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(home: RootApp());
  }
}

class RootApp extends StatefulWidget {
  [@override](/user/override)
  _RootAppState createState() => _RootAppState();
}

class _RootAppState extends State<RootApp> {
  // 初始化插件
  DisableScreenshots _plugin = DisableScreenshots();
  // 监控截屏行为的stream
  late StreamSubscription<void> _screenshotsSubscription;
  int _screenshotsCount = 0;
  bool _disableScreenshots = false;

  [@override](/user/override)
  void initState() {
    super.initState();
    _screenshotsSubscription = _plugin.onScreenShots.listen((event) {
      // 监控到截屏行为会回调到这里
      setState(() {
        _screenshotsCount++;
      });
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('禁止截屏'),
      ),
      body: Column(
        children: <Widget>[
          SizedBox(height: 100), // 增加间距
          Center(
            child: Text("监控到截屏次数：$_screenshotsCount"),
          ),
          Center(
            child: Text(_disableScreenshots ? "禁止截屏状态" : "允许截屏状态"),
          ),
          RaisedButton(
              onPressed: () {
                // 添加默认样式的水印
                _plugin.addWatermark(context, "默认水印",
                    rowCount: 4, columnCount: 8);
              },
              child: Text("添加默认水印")),
          RaisedButton(
              onPressed: () {
                // 添加自定义widget当做水印
                _plugin.addCustomWatermark(context,
                    Watarmark(rowCount: 3, columnCount: 10, text: "自定义水印"));
              },
              child: Text("添加自定义水印")),
          RaisedButton(
              onPressed: () {
                // 移除水印
                _plugin.removeWatermark();
              },
              child: Text("删除水印")),
          RaisedButton(
              onPressed: () async {
                bool flag = !_disableScreenshots;
                // 禁用或允许截屏（只支持iOS）
                await _plugin.disableScreenshots(flag);
                setState(() {
                  _disableScreenshots = flag;
                });
              },
              child: Text(_disableScreenshots
                  ? "允许截屏（仅android适用）"
                  : "禁用截屏（仅android适用)")),
          RaisedButton(
              onPressed: () {
                Navigator.of(context).push(MaterialPageRoute(
                    builder: (_) => Scaffold(
                          appBar: AppBar(
                            title: Text("我是新页面"),
                          ),
                          body: Center(child: Text("new page")),
                        )));
              },
              child: Text("进入新页面"))
        ],
      ),
    );
  }

  [@override](/user/override)
  void dispose() {
    super.dispose();
    // 取消截屏监控可以调用cancel()方法
    if (_screenshotsSubscription != null) {
      _screenshotsSubscription.cancel();
    }
  }
}

class Watarmark extends StatelessWidget {
  final int rowCount;
  final int columnCount;
  final String text;

  const Watarmark(
      {Key? key,
      required this.rowCount,
      required this.columnCount,
      required this.text})
      : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return IgnorePointer(
      child: Container(
          child: Column(
        children: creatColumnWidgets(),
      )),
    );
  }

  List<Widget> creatRowWdiges() {
    List<Widget> list = [];
    for (var i = 0; i < rowCount; i++) {
      final widget = Expanded(
          child: Center(
              child: Transform.rotate(
        angle: pi / 10,
        child: Text(
          text,
          style: TextStyle(
              color: Color(0x08000000),
              fontSize: 18,
              decoration: TextDecoration.none),
        ),
      )));
      list.add(widget);
    }
    return list;
  }

  List<Widget> creatColumnWidgets() {
    List<Widget> list = [];
    for (var i = 0; i < columnCount; i++) {
      final widget = Expanded(
          child: Row(
        children: creatRowWdiges(),
      ));
      list.add(widget);
    }
    return list;
  }
}