错误：expo-camera.isAvailableAsync 和 expo-camera.getAvailableCameraTypesAsync 在 android 上不可用

Question

expo-camera: "^8.0.0"

sdkVersion: "36.0.0"

Hello people, when i try:

    import { Camera } from 'expo-camera';
    ...
    const cameraIsAvailable = await Camera.isAvailableAsync()
    const availablesCameraTypes = await Camera.getAvailableCameraTypesAsync()
    console.log("cameraIsAvailable: ", cameraIsAvailable)
    console.log("availablesCameraTypes: ", availablesCameraTypes)

i get the fallowing errors:

1. expo-camera.isAvailableAsync is not available on android, are you sure you've linked all the native dependencies properly?

2. The method or property expo-camera.getAvailableCameraTypesAsync is not available on android, are you sure you've linked all the native dependencies properly?

the problem just disappear when i remove:

state = {
    ...
    cameraType: Camera.Constants.Type.front,
  };
... 
<Camera
            type={this.state.cameraType}
            flashMode={flashMode}
            style={styles.preview}
            ref={camera => this.camera = camera}
          />

and change it by:

state = {
    ...
    cameraType: Camera.Constants.Type.back,
  };

and i change "cameraType" by

componentDidMount = () => {
    this.props.navigation.addListener('didFocus', async () => {
      await setTimeout(() => {
        this.setState({ cameraType: Camera.Constants.Type.front })
      }, 100)
    });
  }

it seems its an error from expo-camera... so when i try to call these methods:

const cameraIsAvailable = await Camera.isAvailableAsync()
    const availablesCameraTypes = await Camera.getAvailableCameraTypesAsync()

i get following errors: errors: expo-camera.isAvailableAsync and expo-camera.getAvailableCameraTypesAsync is not available on android

Answer 1

The methods you're trying to use, Camera.isAvailableAsync and Camera.getAvailableCameraTypesAsync are marked in the documentation as Web only , so calling them will only work, well, on Web.

In code run in react-native context (as opposed to browser context) just check permissions and you should be good to go!