在Android设备上判断设备是否支持摄像头

private boolean hasCamera(){
        boolean hasCamera=false;
        PackageManager pm=getActivity().getPackageManager();
        hasCamera=pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)||pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)||
                Build.VERSION.SDK_INT<Build.VERSION_CODES.GINGERBREAD||Camera.getNumberOfCameras()>0;
        return hasCamera;
    }