Can't access to camera through react-native-webview

I am using react-native-webview version 4.0.2 . So I have a webview that contains an add button that allows us to take picture with the camera but when clicking at that button nothing is shown and no camera permission shown : this is on android side but working very well on ios (i can see permission and access to camera ) . In my AndroidManifest.xml i do have :

<uses-permission android:name="android.permission.CAMERA" /><uses-feature android:name="android.hardware.camera"      android:required="false"/><uses-feature android:name="android.hardware.camera.autofocus"     android:required="false"/> 

So please do you have any suggestion ?