Hai I am new to the Android. I am using Android4 sdk. I can't enable webcam in Android emulator. Can anyone tell how enable it. Thanks.
There is a way to get this working use the Android Virtual Device Manager. You need to edit your AVD so that in the hardware section either "Configures camera facing front" or "Configures camera facing back" are available. One, but not both, of the values for these properties should be set to "webcam0" (or whatever is available). Then start your virtual device and use your webcam as an emulated camera.
If you have both properties set to "webcam0" then you'll get a warning when you start up the virtual device and the front/back control won't be available in the camera app.
Use emulator help to explore the available options
$ emulator -help 2>&1 | grep cam
-camera-back <mode> set emulation mode for a camera facing back
-camera-front <mode> set emulation mode for a camera facing front
-webcam-list lists web cameras available for emulation
and for example, use -webcam-list to list the recognized cameras
$ emulator -webcam-list @4.1
List of web cameras connected to the computer:
Camera 'webcam0' is connected to device '/dev/video0' on channel 0 using pixel format 'YUYV'
to see the emulation options for cameras
$ emulator -camera-front help @4.1
emulator: ERROR: Invalid value for -camera-front <mode> parameter: help
Valid values are: 'emulated', 'webcam<N>', or 'none'
来源：https://stackoverflow.com/questions/11857006/android-webcam-enable-in-emulator