How to use Android Camera in Background in Flutter?

Question

I need to create an examination application in Flutter, where we need to take photograph and video of a user at some intervals, And while doing this we don't want to show the camera screen.

I tried to use Camera plugin of Flutter, but I am not able to find any way to capture image and video without camera preview.

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:camera/camera.dart';

List<CameraDescription> cameras;

Future<void> main() async {
  cameras = await availableCameras();
  runApp(CameraApp());
}

class CameraApp extends StatefulWidget {
  @override
  _CameraAppState createState() => _CameraAppState();
}

class _CameraAppState extends State<CameraApp> {
  CameraController controller;

  @override
  void initState() {
    super.initState();
    controller = CameraController(cameras[0], ResolutionPreset.medium);
    controller.initialize().then((_) {
      if (!mounted) {
        return;
      }
      setState(() {});
    });
  }

  @override
  void dispose() {
    controller?.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (!controller.value.isInitialized) {
      return Container();
    }
    return AspectRatio(
        aspectRatio:
        controller.value.aspectRatio,
        child: CameraPreview(controller));
  }
}

I want not to show the preview screen and take the images or videos at some interval

I doubt that Android or iOS would let you do that due to privacy issues. — Daniel Eberl, Jul 15 '19 at 10:07
In Android it is possible by directing the output to SurfaceTexture https://stackoverflow.com/a/25769551/3493655 — Pawanpreet Singh, Jul 15 '19 at 10:12
Try to overay the cameraPreview with Container with help of Stack — Navin Kumar, Sep 19 '19 at 09:00

score 3 · Accepted Answer · answered Nov 10 '21 at 05:43

3

While accessing the Camera in the background was possible on earlier iterations of Android. Since Android P, accessing sensors like Camera and Mic can only be done while the app is in the foreground. More details can be read here.

answered Nov 10 '21 at 05:43

Omatt

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How to use Android Camera in Background in Flutter?

1 Answers1