camera 自动对焦手动对焦

基础内容可参考

自动对焦系统概述|Camera

https://jingyan.baidu.com/article/22a299b5c882a29e19376aad.html

对焦框坐标基本概念：

Android Camera2之手动点击区域对焦 - 简书

Camera2点击对焦实现 - mydddfly - 博客园

本文主要总结自己开发过程中遇到的各个知识点

需求: Camera2 App开发:取消自动对焦，设置为触摸手动对焦,对焦完成后依然不允许自动对焦

思路：

触摸屏幕OnTouchListener监听--》根据坐标转换，计算对焦区域--》进行对焦--》显示对焦框

1、触摸屏幕，

private View.OnTouchListener mOntouchListener = new View.OnTouchListener() {@Overridepublic boolean onTouch(View view, MotionEvent event) {try {switch(event.getAction()){case MotionEvent.ACTION_DOWN:int[] location = new int[2];mTextureView[0].getLocationOnScreen(location);int tmpx = mTextureView[0].getWidth();int tmpy = mTextureView[0].getHeight();Log.d(TAG, "onTouch,TextureView.getWidth:" + tmpx +",TextureView.getHeight:" + tmpy + ",location[0]:" + location[0] +",location[1]" + location[1] + ",TextureView.getLeft:" + mTextureView[0].getLeft()+ ",TextureView.getTop:" + mTextureView[0].getTop()+", mTextureView[0].getRight():"+ mTextureView[0].getRight()+", mTextureView[0].getBottom():"+ mTextureView[0].getBottom());int focusWidth = mAutoFoucView.getLayoutParams().width;int focusHeight = mAutoFoucView.getLayoutParams().height;float x_raw = event.getRawX();//between screenfloat y_raw = event.getRawY();//between screenmAutoFoucView.setVisibility(View.VISIBLE);ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) mAutoFoucView.getLayoutParams();
//                        int left = (int) (event.getX() - focusWidth / 2 + location[0]);
//                        int top = (int) (event.getY() - focusHeight / 2 + location[1]);int left = (int) (event.getX() - focusWidth / 2);int top = (int) (event.getY() - focusHeight / 2);Log.d(TAG, "onTouch,focusWidth:" + focusWidth +",focusHeight:" + focusHeight + ",event.getX():" + event.getX() +",event.getY():" + event.getY() + ",event.getRawX():" + event.getRawX()+ ",event.getRawY():" + event.getRawY());layoutParams.leftMargin = left;layoutParams.topMargin = top;mAutoFoucView.setLayoutParams(layoutParams);mAutoFoucView.prepareFocus();int width = mTextureView[0].getWidth();int height = mTextureView[0].getHeight();meteringRectangle = getMeteringRectangles(event.getX(), event.getY(), width, height);Message msg = Message.obtain();msg.what = CameraOpt.MSG_SET_TOUCH_POINT_VALUE;msg.obj= meteringRectangle;msg.arg1 = mAutoFoucView.isFocusing()? 1 : 0;mCameraOpt[0].getHandler().sendMessage(msg);break;}return true;} catch (Exception e) {Log.v("onTouch", e.toString());return false;}}};

                case MSG_SET_TOUCH_POINT_VALUE:meteringRectangle =(MeteringRectangle[]) msg.obj;isFocusing = msg.arg1 != 0;//Log.i(TAG,"isFocusing="+isFocusing);onTouchFoucs(meteringRectangle);break;

    private void onTouchFoucs(MeteringRectangle[] meteringRectangle) {if(isFocusing){
//设置AF/AE对焦区域，开始对焦mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_REGIONS, meteringRectangle);mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_AUTO);mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_START);mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_REGIONS, meteringRectangle);//        mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);mPreviewRequest = mPreviewRequestBuilder.build();try {mCaptureSession.setRepeatingRequest(mPreviewRequest, mPreviewListener, mHandler);} catch (CameraAccessException e) {Log.e(TAG, "setRepeatingRequest failed, " + e.getMessage());}}}

private final CameraCaptureSession.CaptureCallback mPreviewListener = new CameraCaptureSession.CaptureCallback() {@Overridepublic void onCaptureCompleted(CameraCaptureSession session, CaptureRequest request, TotalCaptureResult result) {Log.d(TAG, "onCaptureCompleted begin isFocusing="+isFocusing);if (mPreviewRequestBuilder == null) {return;}if(isFocusing){Integer afState = result.get(CaptureResult.CONTROL_AF_STATE);//Log.d(TAG, "onCaptureCompleted begin afState="+afState);if (CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED == afState|| CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED == afState) {isFocusSucess = true;mCamLister.onFocusState(isFocusSucess);mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);//如果对焦完成后不允许自动对焦，注释掉如下几行。
//                    mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_IDLE);
//                    mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
//                    mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);mPreviewRequest = mPreviewRequestBuilder.build();try {mCaptureSession.setRepeatingRequest(mPreviewRequest, null, mHandler);//} catch (CameraAccessException e) {Log.e(TAG, "setRepeatingRequest failed, errMsg: " + e.getMessage());}}else {isFocusSucess = false;mCamLister.onFocusState(isFocusSucess);}}isFocusing = false;super.onCaptureCompleted(session, request, result);
//            Log.d(TAG, mCameraId + " onCaptureCompleted end");}@Overridepublic void onCaptureStarted(CameraCaptureSession session, CaptureRequest request, long timestamp, long frameNumber) {super.onCaptureStarted(session, request, timestamp, frameNumber);}@Overridepublic void onCaptureFailed(CameraCaptureSession session, CaptureRequest request, CaptureFailure failure) {super.onCaptureFailed(session, request, failure);}};

mPreviewListener是监听预览界面；

getMeteringRectangles函数后面补充

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