Camera access in Flutter - Cheat Sheet & Quick Revision

Recall & Review

beginner

What permission is required to access the camera on a mobile device in Flutter?

You need to request the camera permission in the app's manifest (Android) or Info.plist (iOS) to access the camera.

beginner

Which Flutter package is commonly used to access the device camera?

The camera package is commonly used to access and control the device camera in Flutter apps.

intermediate

How do you display a live camera preview in Flutter?

Use the CameraController to initialize the camera and then display the preview using CameraPreview(controller) widget.

intermediate

What is the purpose of CameraController.initialize() in Flutter camera usage?

It prepares the camera for use by initializing the hardware and setting up the stream for preview and capture.

beginner

Why should you dispose the CameraController when done?

Disposing the controller frees up the camera resource and avoids memory leaks or app crashes.

Which Flutter widget shows the live camera feed?

A Container

B CameraPreview

C VideoPlayer

D Image

The CameraPreview widget displays the live camera feed controlled by CameraController.

Before using the camera, what must you do with the CameraController?

A Call start()

B Call dispose()

C Call initialize()

D Call stop()

You must call initialize() to prepare the camera hardware before showing preview or taking pictures.

Where do you declare camera permission for Android in Flutter?

A Info.plist

B MainActivity.kt

C pubspec.yaml

D AndroidManifest.xml

Android requires camera permission declared in AndroidManifest.xml.

What happens if you don't dispose the CameraController?

A Camera resource may stay locked

B App will run faster

C Nothing happens

D Camera preview shows twice

Not disposing the controller can keep the camera locked, causing resource leaks or crashes.

Which package do you add to pubspec.yaml to use the camera?

A camera

B video_player

C image_picker

D flutter_camera

The official package for camera access is named camera.

Explain the steps to show a live camera preview in a Flutter app.

Think about permissions, setup, UI, and cleanup.

Why is it important to handle camera permissions and resource management carefully in mobile apps?

Consider user trust and app performance.