I use camera.getParameters() to get all camera parameters of the smart phone, and camera.getParameters.set(key, value) to control the target parameters.
When I choose MX4 as my test phone, the parameters contain two parameters as follows: shutter-value = 0 and shutter-value-supported = 0, 125, 250, 500, 1000, ... , 10000000 of millisecond. Then I set the shutter-value = 125 and take a picture, I find it works.
Let's go on. Then I choose MI6 as my next text phone, not as the same as MX4, the parameters contain three parameters about exposure time as follows: manual-exposure-modes = off, exp-time-priority, iso-priority, user-seting, max-exposure-time = 459.592350, min-exposure-time = 0.019681. It puzzles me a lot that there is not a parameter like exposure-time-value. I set 'exposure-time = 100 or 0.1' myself, the camera works but I didn't observe the difference. Then, I set 'exposure-time = 0.01', smaller than 0.019681, the camera didn't work, looks like this parameters did work. But this parameter 'exposure-time' is set by myself.
So, can you give me an answer that how to control the exposure-time with camera API not camera 2 API.
Thanks a lot.