你对android camera的对焦模式相熟吗？
晓得什么场景下该设置哪种对焦模式吗？
本文针对上面2点开展介绍，和大家一起学习~
一、有哪几种对焦模式？二、如何应用各种对焦模式？一、有哪几种对焦模式？
1）获取设施反对的对焦模式
Google为咱们提供了查问以后设施反对的对焦模式的接口~
Camera1获取对焦模式接口：
----- Camera.java public String getFocusMode() { return get(KEY_FOCUS_MODE); }Camera2获取对焦模式接口：
----- CameraCharacteristics.java @PublicKey public static final Key<int[]> CONTROL_AF_AVAILABLE_MODES = new Key<int[]>("android.control.afAvailableModes", int[].class);2）各种对焦模式的介绍
这里只介绍罕用的几种对焦模式，详解的介绍，能够查看文末附的源码内容。
咱们罕用的也就上面4种对焦模式。
public static final String FOCUS_MODE_AUTO = "auto"; public static final String FOCUS_MODE_FIXED = "fixed"; public static final String FOCUS_MODE_CONTINUOUS_VIDEO = "continuous-video"; public static final String FOCUS_MODE_CONTINUOUS_PICTURE = "continuous-picture"; FOCUS_MODE_AUTO：主动对焦，这个只会触发一次对焦，并且是须要在预览开启后，调用autoFocus接口后才会触发，像触点对焦、和拍照对焦都能够用到该模式； FOCUS_MODE_FIXED：定焦，有些摄像头自身不反对对焦； FOCUS_MODE_CONTINUOUS_VIDEO：录像的时候，能够采纳该模式，会继续对焦，设置parameter参数后就会失效； FOCUS_MODE_CONTINUOUS_PICTURE ：拍照的时候，能够采纳该模式，会继续对焦，设置parameter参数后就会失效，对焦速度绝对 FOCUS_MODE_CONTINUOUS_VIDEO 会快点；三、如何应用各种对焦模式？
下面第二点针对4种常见的对焦模式，做了简略的介绍，咱们也晓得，除了auto模式，像 FOCUS_MODE_CONTINUOUS_VIDEO、FOCUS_MODE_CONTINUOUS_PICTURE 模式，是在设置camera parameter参数后就失效。
上面来看下google给咱们提供了哪些调用接口：
1）Camera1
public final void autoFocus(AutoFocusCallback cb) { ... } public void setFocusMode(String value) { ... } public void setParameters(Parameters params) { ... } public final void cancelAutoFocus() { ... }2）Camera2
request.set(CaptureRequest.CONTROL_AF_MODE, int focusMode);附：
各种对焦模式的介绍？（贴的Android源码外面的介绍，写的够具体）
/** * Auto-focus mode. Applications should call {@link * #autoFocus(AutoFocusCallback)} to start the focus in this mode. */ public static final String FOCUS_MODE_AUTO = "auto"; /** * Focus is set at infinity. Applications should not call * {@link #autoFocus(AutoFocusCallback)} in this mode. */ public static final String FOCUS_MODE_INFINITY = "infinity"; /** * Macro (close-up) focus mode. Applications should call * {@link #autoFocus(AutoFocusCallback)} to start the focus in this * mode. */ public static final String FOCUS_MODE_MACRO = "macro"; /** * Focus is fixed. The camera is always in this mode if the focus is not * adjustable. If the camera has auto-focus, this mode can fix the * focus, which is usually at hyperfocal distance. Applications should * not call {@link #autoFocus(AutoFocusCallback)} in this mode. */ public static final String FOCUS_MODE_FIXED = "fixed"; /** @hide * Normal focus mode. Applications should call * {@link #autoFocus(AutoFocusCallback)} to start the focus in this * mode. */ public static final String FOCUS_MODE_NORMAL = "normal"; /** * Extended depth of field (EDOF). Focusing is done digitally and * continuously. Applications should not call {@link * #autoFocus(AutoFocusCallback)} in this mode. */ public static final String FOCUS_MODE_EDOF = "edof"; /** * Continuous auto focus mode intended for video recording. The camera * continuously tries to focus. This is the best choice for video * recording because the focus changes smoothly . Applications still can * call {@link #takePicture(Camera.ShutterCallback, * Camera.PictureCallback, Camera.PictureCallback)} in this mode but the * subject may not be in focus. Auto focus starts when the parameter is * set. * * <p>Since API level 14, applications can call {@link * #autoFocus(AutoFocusCallback)} in this mode. The focus callback will * immediately return with a boolean that indicates whether the focus is * sharp or not. The focus position is locked after autoFocus call. If * applications want to resume the continuous focus, cancelAutoFocus * must be called. Restarting the preview will not resume the continuous * autofocus. To stop continuous focus, applications should change the * focus mode to other modes. * * @see #FOCUS_MODE_CONTINUOUS_PICTURE */ public static final String FOCUS_MODE_CONTINUOUS_VIDEO = "continuous-video"; /** * Continuous auto focus mode intended for taking pictures. The camera * continuously tries to focus. The speed of focus change is more * aggressive than {@link #FOCUS_MODE_CONTINUOUS_VIDEO}. Auto focus * starts when the parameter is set. * * <p>Applications can call {@link #autoFocus(AutoFocusCallback)} in * this mode. If the autofocus is in the middle of scanning, the focus * callback will return when it completes. If the autofocus is not * scanning, the focus callback will immediately return with a boolean * that indicates whether the focus is sharp or not. The apps can then * decide if they want to take a picture immediately or to change the * focus mode to auto, and run a full autofocus cycle. The focus * position is locked after autoFocus call. If applications want to * resume the continuous focus, cancelAutoFocus must be called. * Restarting the preview will not resume the continuous autofocus. To * stop continuous focus, applications should change the focus mode to * other modes. * * @see #FOCUS_MODE_CONTINUOUS_VIDEO */ public static final String FOCUS_MODE_CONTINUOUS_PICTURE = "continuous-picture";自己从事Android Camera相干开发已有5年
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---- 2020.01.04 深圳