douyin_demo/lib/pages/FaceDetection.dart

import 'dart:io';
import 'package:firebase_ml_vision/firebase_ml_vision.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

class FaceDetectionView extends StatefulWidget {
  FaceDetectionView({Key key}) : super(key: key);

  @override
  _FaceDetectionViewState createState() => _FaceDetectionViewState();
}

class _FaceDetectionViewState extends State<FaceDetectionView> {
  File filePath;

  @override
  void initState() {
    super.initState();
  }

  chooseImage() async {
    filePath = await ImagePicker.pickImage(
        source: ImageSource.gallery,
        imageQuality: 100,
        maxWidth: MediaQuery.of(context).size.width);
    var availableImage = filePath;
    // final FirebaseVisionImageMetadata metadata = FirebaseVisionImageMetadata(
    //     rawFormat: availableImage.format.raw,
    //     size: Size(
    //         availableImage.width.toDouble(), availableImage.height.toDouble()),
    //     planeData: availableImage.planes
    //         .map((currentPlane) => FirebaseVisionImagePlaneMetadata(
    //             bytesPerRow: currentPlane.bytesPerRow,
    //             height: currentPlane.height,
    //             width: currentPlane.width))
    //         .toList(),
    //     rotation: ImageRotation.rotation90);
    final FirebaseVisionImage visionImage =
        FirebaseVisionImage.fromFile(filePath);
    final FaceDetector detector = FirebaseVision.instance.faceDetector();
    final List<Face> faces = await detector.processImage(visionImage);

    print(faces[0].boundingBox);

    setState(() {
      filePath = filePath;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Stack(children: [
      RaisedButton(
        child: Text("选择图片"),
        onPressed: () {
          chooseImage();
        },
      ),
      filePath == null
          ? Container()
          : Container(
              child: Image.file(
                filePath,
                fit: BoxFit.fitWidth,
              ),
            )
    ]);
  }
}

class FaceMain extends StatelessWidget {
  const FaceMain({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FaceDetectionView(),
    );
  }
}