Flutter：Remove.bg 去背APP

開發這個APP最困難的地方是研究如何使用http去串接Remove.bg的API，花了很多時間研究。

記得先到https://www.remove.bg/註冊帳號申請api

參考資料：

[1] flutter download an Image from url

[2] Swift iOS App 的圖片上傳，以 remove.bg & Imgur API 為例

程式運作流程：

啟動APP -> 點擊拍照 -> 保存拍攝圖片 -> 用http套件串接去背API -> post圖片(普通圖片轉成base64Image格式) -> 下載去背後圖片(response.bodyBytes) ->預覽成果

程式碼：

main.dart

CameraTaken.dart

preview_screen.dart

串接API關鍵處：

以下程式進行了HTTP API的POST(圖片上傳，base64格式)、去背成功圖片下載(response.bodyBytes)

initState() {
   _asyncMethod();
   super.initState();
}
_asyncMethod()async{
List<int> imageBytes = File(widget.imagePath).readAsBytesSync();
print(imageBytes);
String base64Image = base64Encode(imageBytes);
final body = {"image_file_b64": base64Image, "size": "auto"};
final headers = {"X-API-Key": "put_API_Key_Here"};
final response = await http.post('https://api.remove.bg/v1.0/removebg', 
            body: body,
            headers: headers);
if (response.statusCode == 200) {
   var documentDirectory = await getApplicationDocumentsDirectory();
   var firstPath = documentDirectory.path + "/images";
   var filePathAndName = documentDirectory.path + '/images/pic.jpg'; 
   await Directory(firstPath).create(recursive: true);
   File file2 = new File(filePathAndName);
   file2.writeAsBytesSync(response.bodyBytes);
   setState(() {
    imageData = filePathAndName;
    dataLoaded = true;
   });
   } else {
        throw Exception('Failed to do network requests: Error Code: ${response.statusCode}\nBody: ${response.body}');
          }
      }
   String imageData;
   bool dataLoaded = false;