Flutter 常用

Flutter 发布模式判断

//发布模式
const bool kReleaseMode = bool.fromEnvironment('dart.vm.product')

空值处理

// User below
title ??= "Title";

// instead of
if (title == null) {
  title = "Title";
}

flutter 图片拍摄

插件:

https://pub.dev/packages/permission_handler

await Permission.camera.request().isGranted //获取拍照权限

https://pub.dev/packages/image_picker

final pickedFile = await picker.getImage(

​     source: ImageSource.camera,//开启摄像头

​     maxWidth: 600.w,//图片宽高

​     maxHeight: 600.w,

​     imageQuality: 80);//图片质量

苹果手机配置 info

<key>NSCameraUsageDescription</key>
<string>it is used to write one question and answer one question</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>it is used to write one question and answer one question</string>
<key>NSMicrophoneUsageDescription</key>
<string>it is used to record a video for publish in the third part</string>

银行卡识别

https://pub.dev/packages/flutter_tencent_ocr

排坑指南

腾讯云识别对图像大小有限制

  Future bankOCR() async {
    if (await Permission.camera.request().isGranted) {
      final pickedFile = await picker.getImage(
          source: ImageSource.camera,
          maxWidth: 600.w,
          maxHeight: 600.w,
          imageQuality: 80);

      if (pickedFile != null) {
        _image = File(pickedFile.path);
        BotToast.showLoading();
        FlutterTencentOcr.bankCardOCR(
          SecretId,
          SecretKey,
          GeneralOCRRequest.fromParams(
              imageBase64: base64Encode(_image.readAsBytesSync())),
        ).then((onValue) {
          if (onValue.bankInfo != null) {
            setState(() {
              bank = onValue.bankInfo;
              cardNumber = onValue.cardNo;
            });
          } else {
            BotToast.closeAllLoading();
            BotToast.showText(
                text: onValue.error.message, align: Alignment.center);
          }
        }).catchError(
          (error) {
            BotToast.closeAllLoading();
            BotToast.showText(text: error, align: Alignment.center);
          },
        );
      }
    } else {
      BotToast.showText(text: '未开启拍照权限', align: Alignment.center);
    }
  }

封装dio请求

全局拦截器(日志拦截器,错误拦截)

Flutter 安卓后台运行

插件:

https://pub.dev/packages/app_background_utils