【Android】CameraUtil

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package com.rex.utils;import android.graphics.ImageFormat;import android.hardware.Camera;import android.util.Log;public class CameraUtil {    public static Camera mCamera = null;    public static Camera.Size openCamera(boolean isFront) {        if (mCamera != null) {            throw new RuntimeException("camera already initialized");        }        int mPosition;        if(isFront){            mPosition= Camera.CameraInfo.CAMERA_FACING_FRONT;        }else {            mPosition=Camera.CameraInfo.CAMERA_FACING_BACK;        }        mCamera=Camera.open(mPosition);        if (mCamera == null) {            Log.e("Visionin", "No front-facing camera found; opening default");            mCamera = Camera.open();    // opens first back-facing camera        }        Camera.Parameters parms = mCamera.getParameters();        return parms.getPreviewSize();    }    public static Camera.Size openCamera(int desiredWidth, int desiredHeight, boolean isFront) {        if (mCamera != null) {            throw new RuntimeException("camera already initialized");        }        int mPosition;        if(isFront){            mPosition= Camera.CameraInfo.CAMERA_FACING_FRONT;            mCamera = Camera.open(mPosition);        }else {            mPosition=Camera.CameraInfo.CAMERA_FACING_BACK;            mCamera=Camera.open(mPosition);        }        if (mCamera == null) {            Log.e("Visionin", "No front-facing camera found; opening default");            mCamera = Camera.open();    // opens first back-facing camera        }        Camera.Parameters parms = mCamera.getParameters();        Camera.Size ppsfv = parms.getPreferredPreviewSizeForVideo();        if (ppsfv != null) {            Log.e("Visionin", "Camera preferred preview size for video is " +                    ppsfv.width + "x" + ppsfv.height);            parms.setPreviewSize(ppsfv.width, ppsfv.height);        }        for (Camera.Size size : parms.getSupportedPreviewSizes()) {            if (size.width == desiredWidth && size.height == desiredHeight) {                parms.setPreviewSize(desiredWidth, desiredHeight);                break;            }        }        parms.setRecordingHint(true);        parms.setPreviewFormat(ImageFormat.NV21);        mCamera.setParameters(parms);        int[] fpsRange = new int[2];        parms.getPreviewFpsRange(fpsRange);        return parms.getPreviewSize();    }    public static void releaseCamera() {        if (mCamera != null) {            mCamera.stopPreview();            mCamera.release();            mCamera = null;            Log.d("Visionin", "releaseCamera -- done");        }    }}
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