flutter 調用攝像頭和照片

　　設置一個按鈕調用   打開showCupertinoModalPopup

FloatingActionButton(onPressed: (){
            _showDialog(context);
          },

            child: Text('aaaaaa'),),
　　打開底部彈出框

 void _showDialog(BuildContext cxt){
    showCupertinoModalPopup<int>(context: cxt, builder:(cxt){
      var dialog =CupertinoActionSheet(
        title: Text("請選擇"),
//        message: Text('上傳作業!'),
        cancelButton: CupertinoActionSheetAction(onPressed: (){
          Navigator.pop(cxt,0);
        }, child: Text("取消")),
        actions: <Widget>[
          CupertinoActionSheetAction(onPressed: (){
            showImagePicker(1);
            Navigator.pop(cxt,1);

          }, child: Text('相機')),

          CupertinoActionSheetAction(onPressed: (){
            showImagePicker(2);
            Navigator.pop(cxt,2);
          }, child: Text('相冊')),
        ],
      );
      return dialog;
    });
  }



　　根據選擇的設備進行調用相機或者相冊

showImagePicker(type) async{
　　

/// Specifies the source where the picked image should come from.
enum ImageSource {  這個是調用源碼
  /// Opens up the device camera, letting the user to take a new picture.
  camera,

  /// Opens the user's photo gallery.
  gallery,
}

  var image = await ImagePicker.pickImage(source: type ==1?ImageSource.camera: ImageSource.gallery);  枚舉類型 設置調用的類型camera 相機  另外一個是本地相冊

  setState(() {
    _image = image;
  });

}

需要引入的包：

import 'package:image_picker/image_picker.dart';
import 'package:flutter/cupertino.dart';