關於Android Camera2 API 的自動對焦的坑

https://www.jianshu.com/p/280e5301b7b9

正常：
2019-12-16 13:28:56.048 6880-6880/org.cv.usingcamera D/Camera2Activity: start lockFocusing
2019-12-16 13:28:56.081 6880-7032/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:28:56.082 6880-7032/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:28:56.156 6880-7032/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:28:56.156 6880-7032/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:28:56.202 6880-7032/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:28:56.202 6880-7032/org.cv.usingcamera V/Camera2Activity: afState = 5
2019-12-16 13:28:56.202 6880-7032/org.cv.usingcamera V/Camera2Activity: before captureStillPicture() 2 
2019-12-16 13:28:56.202 6880-7032/org.cv.usingcamera V/Camera2Activity: in captureStillPicture() mState = 4
2019-12-16 13:28:56.206 6880-7032/org.cv.usingcamera E/Camera2Activity: cf.orientation:1
2019-12-16 13:28:56.206 6880-7032/org.cv.usingcamera E/Camera2Activity: cf.orientation:1 rotation:0 landscape2
2019-12-16 13:28:56.206 6880-7032/org.cv.usingcamera E/Camera2Activity: rotation:0ORIENTATIONS.get:90mSensorOrientation:90f:90
2019-12-16 13:28:56.210 6880-7032/org.cv.usingcamera D/Camera2Activity: start capturing
2019-12-16 13:28:56.260 6880-7032/org.cv.usingcamera V/Camera2Activity: mState = 4
2019-12-16 13:28:56.389 6880-7032/org.cv.usingcamera V/Camera2Activity: finish saving /storage/emulated/0/usingCamera/20191216132856(20318069).jpg

異常：
2019-12-16 13:37:27.907 6880-6880/org.cv.usingcamera D/Camera2Activity: start lockFocusing
2019-12-16 13:37:27.947 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:27.948 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.027 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.028 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.090 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.091 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.147 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.147 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.207 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.208 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.256 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.257 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.320 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.321 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.384 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.385 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.441 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.442 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.503 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.503 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.560 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.561 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.629 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.631 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.673 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.674 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 1
2019-12-16 13:37:28.756 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.757 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:28.798 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.798 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:28.861 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.862 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:28.932 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:28.933 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.000 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.001 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.047 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.048 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.123 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.123 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.163 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.164 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.225 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.226 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.296 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.297 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.344 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.345 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.417 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.419 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.475 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.476 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.544 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.545 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.577 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.577 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.649 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.652 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.703 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.704 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.766 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.766 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.832 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.833 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.896 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.897 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:29.950 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1
2019-12-16 13:37:29.950 6880-7868/org.cv.usingcamera V/Camera2Activity: afState = 2
2019-12-16 13:37:30.017 6880-7868/org.cv.usingcamera V/Camera2Activity: mState = 1