android 慢动作触发区域对焦

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一、普通模式区域对焦

Android Camera2 实现触摸对焦功能(Touch to Focus) - 简书

关键代码

public void startControlAFRequest(MeteringRectangle rect,CameraCaptureSession.CaptureCallback captureCallback) {MeteringRectangle[] rectangle = new MeteringRectangle[]{rect};// 对焦模式必须设置为AUTOmPreviewBuilder.set(CaptureRequest.CONTROL_AF_MODE,CaptureRequest.CONTROL_AF_MODE_AUTO);//AEmPreviewBuilder.set(CaptureRequest.CONTROL_AE_REGIONS,rectangle);//AF 此处AF和AE用的同一个rect, 实际AE矩形面积比AF稍大, 这样测光效果更好mPreviewBuilder.set(CaptureRequest.CONTROL_AF_REGIONS,rectangle);try {// AE/AF区域设置通过setRepeatingRequest不断发请求mSession.setRepeatingRequest(mPreviewBuilder.build(), null, mHandler);} catch (CameraAccessException e) {e.printStackTrace();}//触发对焦mPreviewBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,CaptureRequest.CONTROL_AF_TRIGGER_START);try {//触发对焦通过capture发送请求, 因为用户点击屏幕后只需触发一次对焦mSession.capture(mPreviewBuilder.build(), captureCallback, mHandler);} catch (CameraAccessException e) {e.printStackTrace();}
}

//触发对焦通过capture发送请求, 因为用户点击屏幕后只需触发一次对焦
mSession.capture(mPreviewBuilder.build(), captureCallback, mHandler);

二、慢动作模式区域对焦

慢动作模式使用上述mSession.capture是无法完成对焦的，需要使用mSession.captureBurst来完成。

2.1 创建List<CaptureRequest>

    public List<CaptureRequest> createHighSpeedRequestList(CameraDevice cameraDevice, CameraConstrainedHighSpeedCaptureSession session,int templateType, Surface... surfaces) {CaptureRequest.Builder reqBuilder;List<CaptureRequest> list;try {reqBuilder = cameraDevice.createCaptureRequest(templateType);for (CaptureRequest.Key<?> key : mCaptureRequests.keySet()) {setRequest(reqBuilder, key);}addRequestParameter(reqBuilder);for (Surface surface : surfaces) {reqBuilder.addTarget(surface);}list = session.createHighSpeedRequestList(reqBuilder.build());} catch (CameraAccessException err) {err.printStackTrace();return null;}return list;}

2.2 进行一次对焦动作

List<CaptureRequest> requestList = createHighSpeedRequestList(...);
mSession.captureBurst(requestList, captureCallback, mHandler);

项目经验，仅供参考

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