How to detect no of camera's available in android device? and also if the device has front camera how to use it?

How to detect no of camera's available in android device? and also i开发者_如何学编程f the device has front camera how to use it?

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What I would suggest is similar to doc_180's answer, but should be able to detect both front and back facing cameras even for Froyo, though if I'm not mistaken, Froyo never supported front-facing cameras, so you'll always get a false response for frontCam on Froyo.

PackageManager pm = getPackageManager();
boolean frontCam, rearCam;

//Must have a targetSdk >= 9 defined in the AndroidManifest
frontCam = pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT);
rearCam = pm.hasSystemFeature(PackageManager.FEATURE_CAMERA);

EDIT: Just realized this is a really, really old question. Oh well, hopefully it helps someone in the future.

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Use packagemanager to check if the device supports the Intent. In this case Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

public static boolean isIntentAvailable(Context context, String action) {
    final PackageManager packageManager = context.getPackageManager();
    final Intent intent = new Intent(action);
    List<ResolveInfo> list =
            packageManager.queryIntentActivities(intent,
                    PackageManager.MATCH_DEFAULT_ONLY);
    return list.size() > 0;
}

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    CameraInfo cameraInfo = new CameraInfo();
    for (int i = 0; i < numberOfCameras; i++) {
        Camera.getCameraInfo(i, cameraInfo);
        if (cameraInfo.facing == CameraInfo.CAMERA_FACING_FRONT) {              

        }
    }

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The quickest way I've found to check if a (backfacing) camera exists is to check if Camera.open() returns null.

Camera cam = Camera.open();
if(null == cam){
   //no camera exists
}

This should be available for earlier versions of android as well.

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you can use this static method if you just want to know how many cameras there are: Camera.getNumberOfCameras(); (api 9)

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/** Check if this device has a camera */
private boolean checkCameraHardware(Context context) {
    if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
        // this device has a camera
        return true;
    } else {
        // no camera on this device
        return false;
    }
}

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I am using this method to get the count of the available camera

 public int getCameraCount(){
    CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
    try {
        String[] strings = manager.getCameraIdList();
        return strings.length;
    } catch (CameraAccessException e) {
        e.printStackTrace();
        return 0;
    }
}

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Try this, this worked for me in a Moto RAZR HD:

public static Camera open (int cameraId)

Example usage:

mCamera = Camera.open(1);