手动对焦在camera2，android [英] Manual focus in camera2, android

问题描述

我在寻找手机焦点的例子在camera2在Android。
我试图获得最小焦距和可用焦距如下所示，但它没有帮助。如何控制焦距？

i am looking for an example of manual focus in camera2 in android. I tried to get minimum focus distance and available focal lengths shown below, but it didn't help. How to control the focus distance ?

float minimumLens = characteristics.get(CameraCharacteristics.LENS_INFO_MINIMUM_FOCUS_DISTANCE);

float[] lensDistances = characteristics.get(CameraCharacteristics.LENS_INFO_AVAILABLE_FOCAL_LENGTHS); 

我需要用seekbar控制它。
提前感谢。

I need to control it with seekbar. Thanks in advance.

推荐答案

 switch (seekBar.getId()) {
            case R.id.sb_focus:
                float minimumLens = mCameraCharacteristics.get(CameraCharacteristics.LENS_INFO_MINIMUM_FOCUS_DISTANCE);
                float num = (((float) i) * minimumLens / 100);
                mPreviewBuilder.set(CaptureRequest.LENS_FOCUS_DISTANCE, num);
                int showNum = (int) num;
                mSeekBarTextView.setText("focus：" + showNum);
                break;}

注意，CONTROL_AF_MODE应该为OFF。

https://github.com/pinguo-yuyidong/Camera2/blob/master/app/src/main/java/us/yydcdut/androidltest/ui/DisplayFragment.java


行1109中的代码

be careful ,CONTROL_AF_MODE should be OFF.
https://github.com/pinguo-yuyidong/Camera2/blob/master/app/src/main/java/us/yydcdut/androidltest/ui/DisplayFragment.java
code in Line 1109

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