效果：

可以直接引用：disable_screenshots: ^0.2.0
但是有时候直接引用会报错，可以不引用插件直接把下面的源码工具类放在项目里面
工具类源码：

import 'dart:io';
import 'dart:math';import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';class DisableScreenshots {DisableScreenshots.private(this._methodChannel, this._eventChannel);static   DisableScreenshots? _instance/* = DisableScreenshots.private()*/;factory DisableScreenshots() {if (_instance == null) {final MethodChannel methodChannel = const MethodChannel("com.devlxx.DisableScreenshots/disableScreenshots");final EventChannel eventChannel =const EventChannel('com.devlxx.DisableScreenshots/observer');_instance = DisableScreenshots.private(methodChannel, eventChannel);}return _instance!;}final MethodChannel _methodChannel;final EventChannel _eventChannel;Stream<void>? _onScreenShots=null;OverlayEntry? _overlayEntry;void addWatermark(BuildContext context, String watermark,{int rowCount = 3, int columnCount = 10, TextStyle? textStyle}) async {if (_overlayEntry != null) {_overlayEntry!.remove();}OverlayState? overlayState = Overlay.of(context);_overlayEntry = OverlayEntry(builder: (context) => DisableScreenshotsWatarmark(rowCount: rowCount,columnCount: columnCount,text: watermark,textStyle: textStyle ??const TextStyle(color: Color(0x08000000),fontSize: 18,decoration: TextDecoration.none),));overlayState?.insert(_overlayEntry!);// return await _methodChannel.invokeMethod<void>("addWatermark", ['我是水印']);}void addCustomWatermark(BuildContext context, Widget widget) {if (_overlayEntry != null) {_overlayEntry!.remove();}OverlayState? overlayState = Overlay.of(context);_overlayEntry = OverlayEntry(builder: (context) => widget);overlayState?.insert(_overlayEntry!);}void removeWatermark() async {if (_overlayEntry != null) {_overlayEntry!.remove();_overlayEntry = null;}}Stream<void> get onScreenShots {if (_onScreenShots == null) {_onScreenShots = _eventChannel.receiveBroadcastStream();}return _onScreenShots!;}/// 只支持安卓Future<void> disableScreenshots(bool disable) async {if (Platform.isAndroid) {return await _methodChannel.invokeMethod("disableScreenshots", {"disable": disable});} else {print('仅Android平台支持禁用屏幕截图');}}
}class DisableScreenshotsWatarmark extends StatelessWidget {final int rowCount;final int columnCount;final String text;final TextStyle textStyle;const DisableScreenshotsWatarmark({Key? key,required this.rowCount,required this.columnCount,required this.text,required this.textStyle,}) : super(key: key);@overrideWidget 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))));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;}
}

使用：

初始化

waterMarkerPlugin 要创建为全局的

  // 初始化水印插件static  DisableScreenshots waterMarkerPlugin = DisableScreenshots();

添加水印

//添加水印Params.waterMarkerPlugin.addWatermark(context,'默认水印',rowCount: 4,columnCount: 8);

取消水印

  //取消水印Params.waterMarkerPlugin.removeWatermark();