Android的摄像机2 API - 检测时，我们有重点 [英] Android Camera2 API - Detect when we have focus

问题描述

所以，我设法创造我想用老相机，我想它的方式的功能。

So, I managed to create the functionality i wanted with the old camera the way I wanted it.

使用mCamera.autoFocus（autoFocusCallback）;我发现，当我有重点和运行所需的code，而在preVIEW模式。

With mCamera.autoFocus(autoFocusCallback); i detect when I have focus and run the required code while in preview-mode.

现在我有一个很难把握如何做同样的摄像机2 API。
我的第一个想法是，我会使用

Now I have a hard time grasping how to do the same in camera2 API. My first idea was that i'd use

        private void process(CaptureResult result) {
        switch (mState) {
            case STATE_PREVIEW: {
                // We have nothing to do when the camera preview is working normally.
                int afState = result.get(CaptureResult.CONTROL_AF_STATE);
                //if (CaptureResult.CONTROL_AF_STATE == afState) {
                    Log.d("SOME KIND OF FOCUS", "WE HAVE");
                //}

                break;
            }
}

但我无法找到某种状态，告诉我，我们已经得到了关注的焦点。是否有人有任何想法如何这可以用摄像机2 API做什么？

but I fail to find some kind of state that tells me we have gotten focus. Does someone have any idea how this can be done with Camera2 API?

推荐答案

您已经基本上得到了它。状态列表您可以检查和过渡，可以发现<一个href=\"https://developer.android.com/reference/android/hardware/camera2/CaptureResult.html#CONTROL_AF_STATE\"相对=nofollow>这里。

You've basically got it. The list of states you can check for and their transitions can be found here.

这要看是什么 CONTROL_AF_MODE 你使用，但一般你检查 FOCUSED_LOCKED 或者 PASSIVE_FOCUSED ，虽然你可能想为 NOT_FOCUSED_LOCKED 和的情况下， PASSIVE_UNFOCUSED 案例相机的只是不能的重点放在现场。

It depends on what CONTROL_AF_MODE you are using, but generally you check for FOCUSED_LOCKED or perhaps PASSIVE_FOCUSED, though you may want to have cases for NOT_FOCUSED_LOCKED and PASSIVE_UNFOCUSED in case the camera just cannot focus on the scene.

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