在Cyanogenmod 12中，你如何根据你的脸解锁？我去了"智能锁" 和训练有素的面部识别。现在我返回屏幕锁，仍然没有选择脸部解锁。
screenshot - 无面部解锁选项（点击放大图像）
In Cyanogenmod 12, how do you unlock based on your face? I went to "smart lock" and trained facial recognition. Now I go back to the Screen lock and there is still no option to unlock with the face.
Screenshot - No face unlock option(Click to enlarge image)
Just saw you were running lollipop. Give the above awnser a shot.
You need to reinstall a Gapps package. That isn't the pico or nano Step 1: Here is a link you might want Download gapps kitkat
Step 2: Reboot your phone into the custom recovery (which should already be installed).
Step 3: Press install from sdcard and locate the zip.
Step 4: Wait for it to install and then reboot the device. And once on it should appear...
If you can't overwrite the Gapps via this method the easiest way to get face unlock would be to get the apk somehow...