android 自定义相机，Camera，相机遮罩层

初期化Camera

@Override

public void surfaceCreated(SurfaceHolder holder) {

    Camera.CameraInfo cameraInfo = new Camera.CameraInfo();

    for (int i = 0; i < Camera.getNumberOfCameras(); i++) {

        Camera.getCameraInfo(i, cameraInfo);

        if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {

            if (cameraId == 0) cameraId = i;

        }

    }



    mCamera = Camera.open(cameraId);

    mCamera.setDisplayOrientation(90);

    Camera.getCameraInfo(cameraId, cameraInfo);

    if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

// mFaceView.setFront(true);

    }

    Log.i(TAG, "surfaceCreated");

    try {

        mCamera.setPreviewDisplay(mView.getHolder());

    } catch (Exception e) {

        Log.e(TAG, "Could not preview the image.", e);

    }

}

### （2）、布局layout.xml添加SurfaceView预览相机

<SurfaceView

android:id="@+id/surfaceview"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_centerInParent="true"/>

mView = (SurfaceView) findViewById(R.id.surfaceview);

mCamera.setPreviewDisplay(mView.getHolder());

### （3）、启动相机Camera类

private void startPreview() {

if (mCamera != null) {

    Log.i(TAG, "startPreview0000");

    mCamera.startPreview();

    mCamera.setPreviewCallback(this);

}

}

@Override

protected void onPostCreate(Bundle savedInstanceState) {

super.onPostCreate(savedInstanceState);

// Check for the camera permission before accessing the camera.  If the

// permission is not granted yet, request permission.

SurfaceHolder holder = mView.getHolder();

holder.addCallback(this);

holder.setFormat(ImageFormat.NV21);

Log.i("lgq", "......onPostCreate");

}

### （4）、点击拍照获取照片



创建回Camera调接口

private Camera.PictureCallback mPicture = new Camera.PictureCallback() {



    @Override

    public void onPictureTaken(byte[] data, Camera camera) {

        // 获取Jpeg图片，并保存在sd卡上

// buff = data;

        bitmap = Bytes2Bimap(data);



        mHandler.sendEmptyMessageDelayed(REFRESH_COMPLETE, 0);

        

    }

};

点击拍照

imageView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

    mCamera.autoFocus(new Camera.AutoFocusCallback() {



        @Override

        public void onAutoFocus(boolean success, Camera camera) {

            // 从Camera捕获图片

            mCamera.takePicture(null, null, mPicture);

        }

    });

}

});

### 二、.camera2.CameraDevice，TextureView实现自定义拍照。API=21以下的手机不可用，



（1）、layout.xml文件添加TextureView

<TextureView

android:id="@+id/tv_textview"

android:layout_width="match_parent"

android:layout_height="match_parent" />

实现代码比较长篇。。。。。。。。



### demo链接：[https://download.youkuaiyun.com/download/meixi\_android/11168640]( )



### 1、创建自定义遮罩层view

/**

• 人脸检测区域View

*/

public class FaceDetectRoundView extends View {

private static final String TAG = FaceDetectRoundView.class.getSimpleName();



public static final float SURFACE_HEIGHT = 1000f;

public static final float SURFACE_RATIO = 0.75f;

public static final float WIDTH_SPACE_RATIO = 0.33f;

public static final float HEIGHT_RATIO = 0.1f;

public static final float HEIGHT_EXT_RATIO = 0.2f;

public static final int CIRCLE_SPACE = 5;

public static final int PATH_SPACE = 16;

public static final int PATH_SMALL_SPACE = 12;

public static final int PATH_WIDTH = 4;



public static final int COLOR_BG = Color.parseColor("#2F2F33");

public static final int COLOR_RECT = Color.parseColor("#FFFFFF");

public static final int COLOR_ROUND = Color.parseColor("#FFA800");



private PathEffect mFaceRoundPathEffect = null;

// new DashPathEffect(new float[]{PATH_SPACE, PATH_SPACE}, 1);

private Paint mBGPaint;

private Paint mPathPaint;

private Paint mFaceRectPaint;

private Paint mFaceRoundPaint;

private Rect mFaceRect;

private Rect mFaceDetectRect;



private float mX;

private float mY;

private float mR;

private boolean mIsDrawDash = true;



public FaceDetectRoundView(Context context) {

    this(context, null);



}



public FaceDetectRoundView(Context context, AttributeSet attrs) {

    super(context, attrs);



    setLayerType(View.LAYER_TYPE_SOFTWARE, null);



    DisplayMetrics dm = context.getResources().getDisplayMetrics();

    float pathSpace = dip2px(context, PATH_SPACE);

    float pathSmallSpace = dip2px(context, PATH_SMALL_SPACE);

    float pathWidth = dip2px(context, PATH_WIDTH);

    mFaceRoundPathEffect = new DashPathEffect(

            new float[]{pathSpace, dm.heightPixels < SURFACE_HEIGHT

                    ? pathSmallSpace : pathSpace}, 1);



    mBGPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

    mBGPaint.setColor(COLOR_BG);

    mBGPaint.setStyle(Paint.Style.FILL);

    mBGPaint.setAntiAlias(true);

    mBGPaint.setDither(true);



    mPathPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

    mPathPaint.setColor(COLOR_ROUND);

    mPathPaint.setStrokeWidth(pathWidth);

    mPathPaint.setStyle(Paint.Style.STROKE);

    mPathPaint.setAntiAlias(true);

    mPathPaint.setDither(true);



    mFaceRectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

    mFaceRectPaint.setColor(COLOR_RECT);

    mFaceRectPaint.setStrokeWidth(pathWidth);

    mFaceRectPaint.setStyle(Paint.Style.STROKE);

    mFaceRectPaint.setAntiAlias(true);

    mFaceRectPaint.setDither(true);



    mFaceRoundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);