Android 自定义相机

检测Android设备是否支持照相机

    /**     * 检测设备是否支持相机     *     * @param context     * @return     */    private boolean checkCameraHardware(Context context) {        if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {            return true;        }        return false;    }

定制拍照程序的步骤：

1、打开相机：Camera.open()；
2、创建SurfaceView对象；
3、添加回调监听器（SurfaceHolder.Callback）；
4、预览（mCamera.startPreview）；
5、拍照（mCamera.takePicture）；

网上资料：

网上写的挺详细的具体自定义操作请查阅以下资料：

Android 自定义Camera相机
https://blog.csdn.net/qq_38001118/article/details/81871564

Android: Camera相机开发详解(上) —— 知识储备
https://www.jianshu.com/p/f8d0d1467584
Android: Camera相机开发详解(中) ——实现预览、拍照、保存照片等功能
https://www.jianshu.com/p/e20a2ad6ad9a
Android: Camera相机开发详解(下) —— 实现人脸检测功能
https://www.jianshu.com/p/3bb301c302e8
Android:Camera2开发详解(上)：实现预览、拍照、保存照片等功能
https://www.jianshu.com/p/0ea5e201260f

项目中遇到的问题：

魔镜项目中人脸识别需要一个宽高为630x780px的框而相机中给的预览和图片尺寸没有给定与项目接近的值

07-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-0: width:1280--height:72007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-1: width:1920--height:108007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-2: width:208--height:14407-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-3: width:176--height:14407-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-4: width:352--height:28807-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-5: width:320--height:24007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-6: width:480--height:32007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-7: width:640--height:48007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-8: width:800--height:48007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-9: width:960--height:54407-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-10: width:960--height:72007-19 17:29:58.280 24520-24520/com.hzy.exampledemo D/mPreviewSizes-11: width:720--height:72007-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-0: width:320--height:24007-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-1: width:640--height:48007-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-2: width:1280--height:72007-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-3: width:1920--height:108007-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-4: width:2432--height:243207-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-5: width:3264--height:244807-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-6: width:4160--height:233607-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-7: width:5152--height:289607-19 17:36:17.400 24520-24520/com.hzy.exampledemo D/mPictureSizes-8: width:5152--height:3888

解决思路：

1、我们设置图片尺寸和预览尺寸为1920x1080px；
2、在布局中添加一个同样大小位置的蒙层，其中中间通过计算留出630x780px;
3、对拍照的图片通过位置计算进行截取；

1、我们设置图片尺寸和预览尺寸为1920x1080px；

        parameters.setPreviewSize(1920, 1080);        parameters.setPictureSize(1920, 1080);

2、在布局中添加一个同样大小位置的蒙层，其中中间通过计算留出630x780px;

package com.yx.mirror.third.camera.view;import android.content.Context;import android.content.res.Resources;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Path;import android.graphics.RectF;import android.util.AttributeSet;import android.view.View;import androidx.annotation.Nullable;import com.yx.mirror.R;/** * Description 遮挡的View * * @author hzy * Create on 2019/7/23 10:13 */public class OcclusionView extends View {    private Paint mPaint;    private int mMaskColor; // 取景框外的背景颜色    private int mCameraWidth;    private int mCameraHeight;    private int mPicWidth;    private int mPicHeight;    /**     * 中点距离和marginTop的差值，由于横向是居中，所以不用计算     */    private int marginDifference;    private OcclusionView mOcclusionView;    public OcclusionView(Context context) {        super(context);        initView();    }    public OcclusionView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        initView();    }    private void initView() {        Resources resources = getResources();        mMaskColor = resources.getColor(R.color.black_back);        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        // 绘制取景框外的暗灰色的表面，分四个矩形绘制        mPaint.setColor(mMaskColor);    }    public void setOcclusionView(OcclusionView mOcclusionView, int mCameraWidth, int mCameraHeight, int mPicWidth, int mPicHeight, int marginDifference) {        this.mOcclusionView = mOcclusionView;        this.mCameraWidth = mCameraWidth;        this.mCameraHeight = mCameraHeight;        this.mPicWidth = mPicWidth;        this.mPicHeight = mPicHeight;        this.marginDifference = marginDifference;    }    @Override    public void onDraw(Canvas canvas) {        if (mOcclusionView == null) {            return; // not ready yet, early draw before done configuring        }        // 黑色区域        Path path1 = new Path();        path1.addRect(new RectF(0, 0, mCameraWidth, mCameraHeight), Path.Direction.CW);        //透明区域        Path path2 = new Path();        path2.addRect(new RectF((mCameraWidth - mPicWidth) / 2, (mCameraHeight - mPicHeight) / 2 + marginDifference, (mCameraWidth + mPicWidth) / 2, (mCameraHeight + mPicHeight) / 2 + marginDifference), Path.Direction.CW);        //DIFFERENCE，path1减去path1和path2相交部分        path1.op(path2, Path.Op.DIFFERENCE);        canvas.drawPath(path1, mPaint);    }}

3、对拍照的图片通过位置计算进行截取；

    /**     * 人脸照片处理     *     * @param bmp     */    private void showFragment(Bitmap bmp) {        translateAnimation.cancel();//动画取消        mImvLine.setVisibility(View.GONE);        Matrix matrix = new Matrix();        //镜子效果        matrix.setScale(-1, 1);        matrix.postTranslate(bmp.getWidth(), 0);        //旋转图片        Bitmap rotateBitmap = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);        //截图至当前图片的大小        Bitmap bitmap = cropBitmap(rotateBitmap, 630, 780);        photoPath = "/qimg/report/" + DateUtil.getDateYmd() + "/" + System.currentTimeMillis() + ".png";        writeBitmapToFile(bitmap, photoPath);        mCameraContainer.setVisibility(View.GONE);        mPhotoIv.setImageBitmap(bitmap);        mPhotoIv.setVisibility(View.VISIBLE);        postImg(bitmap);    }    /**     * 裁剪     * https://blog.csdn.net/qunqunstyle99/article/details/87869018     *     * @param bitmap 原图     * @return 裁剪后的图像     */    private Bitmap cropBitmap(Bitmap bitmap, int picWidth, int picHeight) {        int w = bitmap.getWidth();        int h = bitmap.getHeight();        int x = 0;        int y = 0;        if (bitmap.getWidth() < picWidth) {            Toast.makeText(this, "x + width must be <= bitmap.width()", Toast.LENGTH_SHORT).show();            return bitmap;        }        if (bitmap.getHeight() < picHeight) {            Toast.makeText(this, "y + height must be <= bitmap.height()", Toast.LENGTH_SHORT).show();            return bitmap;        }        x = (w - picWidth) / 2;        y = (h - picHeight) / 2;        return Bitmap.createBitmap(bitmap, x, y, picWidth, picHeight, null, false);    }