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import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:app/common/toast.dart';// 从底部弹出CupertinoActionSheet使用showCupertinoModalPopupvoid _handleTap() { // 某个GestureDetector的事件if (operateType == 'add' || operateType == 'Edit') {showCupertinoModalPopup(context: context,builder: (BuildContext context) => actionSheet(),).then((value) {});}}// 底部弹出菜单actionSheetWidget actionSheet() {return new CupertinoActionSheet(title: new Text('菜单',style: descriptiveTextStyle,),actions: <Widget>[CupertinoActionSheetAction(child: const Text('打开相机拍照',style: TextStyle(fontSize: 14.0,fontFamily: 'PingFangRegular',),),onPressed: () {// 打开相机拍照_getCameraImage();// 关闭菜单Navigator.of(context).pop();},),CupertinoActionSheetAction(child: const Text('打开相册，选取照片',style: TextStyle(fontSize: 14.0,fontFamily: 'PingFangRegular',),),onPressed: () {// 打开相册，选取照片_getGalleryImage();// 关闭菜单Navigator.of(context).pop();},)],cancelButton: CupertinoActionSheetAction(child: new Text('取消',style: TextStyle(fontSize: 13.0,fontFamily: 'PingFangRegular',color: const Color(0xFF666666),),),onPressed: () {// 关闭菜单Navigator.of(context).pop();},),);}

image_picker : ^lastest_version

<!-- 相册 -->   <key>NSPhotoLibraryUsageDescription</key>   <string>App需要您的同意,才能访问相册</string>   <!-- 相机 -->   <key>NSCameraUsageDescription</key>   <string>App需要您的同意,才能访问相机</string>

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />

// 声明一个list，存放image WidgetList<Widget> imageList = List();List<String> _imgUrls = []; // 存放图片路径File _cameraImage;File _galleryImage;Future _getCameraImage() async {print('调用了: 打开相机');var image = await ImagePicker.pickImage(source: ImageSource.camera); // 使用相机setState(() {_cameraImage = image;print('_cameraImage: ' + _cameraImage.toString());_uploadPic(_cameraImage);});}Future _getGalleryImage() async {print('调用了: 打开相册');var image =await ImagePicker.pickImage(source: ImageSource.gallery); // 使用图库setState(() {_galleryImage = image;print('_galleryImage: ' + _galleryImage.toString());_uploadPic(_galleryImage);});}// 上传图片void _uploadPic(File imgfile) async {showLoading(context, '上传中，请等待......');try {String path = imgfile.path;// print('Image path: ' + path);var str = path.split('-');var filename = str[str.length - 1];String uploadServer = BaseUrl.uploadServer;FormData formData = FormData.fromMap({"file": await MultipartFile.fromFile(path, filename: filename),});Response response = await dio.post(uploadServer, data: formData);// print(response);setState(() {dynamic rtn = jsonDecode(response.toString()); // 解析接口返回的json数据// print(rtn);String imgUrl = rtn['data'];_imgUrls.add(imgUrl);// print(" _imgUrls：" + _imgUrls.toString());var isUrl = imgUrl.startsWith('http');if (!isUrl) {imgUrl = BaseUrl.url + imgUrl;}imageList..add(Image.network(imgUrl,height: 50,width: 50,fit: BoxFit.fitWidth, // 显示可能拉伸，可能裁剪，宽度充满));// print(" imageList：" + imageList.toString());});} on DioError catch (e) {//catch 提示print('catch 提示: ' + e.toString());if (e.response != null) {print(e.response.data);} else {showToast("数据加载失败");print(e.request);print(e.message);}} finally {// 隐藏loading框Navigator.of(context).pop();}}

Widget _buildGridViewList() {return new Container(width: MediaQuery.of(context).size.width - 40,color: const Color(0xFFFFFFFF),padding: EdgeInsets.only(left: 8.0),child: GridView.builder(shrinkWrap: true, //是否根据子widget的总长度来设置GridView的长度，默认值为falsegridDelegate: SliverGridDelegateWithFixedCrossAxisCount(mainAxisSpacing: 3,crossAxisSpacing: 3,crossAxisCount: 3, //每行三列childAspectRatio: 1.0, //显示区域宽高相等),itemCount: imageList.length,itemBuilder: (context, index) {// print("调用了 imageList[" + index.toString() + "]" + imageList[index].toString());return new Stack(// 堆叠组件children: <Widget>[Container(alignment: Alignment.center,height: 54,// width: 54.0,color: const Color(0xFFFFFFFF),padding: EdgeInsets.only(left: 8.0),child: imageList[index],),Container(height: 54,// width: 54.0,padding: new EdgeInsets.fromLTRB(0, 10, 0, 0),alignment: Alignment.bottomRight,child: GestureDetector(onTap: () => _handleTapDelePic(index),child: Padding(padding: const EdgeInsets.only(right: 5),child: new Text('删除'),),),),],);},),);}void _handleTapDelePic(int index) {// print('点击删除 ' + index.toString());setState(() {imageList.removeAt(index); //删除位置为index的元素_imgUrls.removeAt(index); //删除位置为index的元素});}