@Override	public void onDraw(Canvas canvas) {		// 中间的扫描框，你要修改扫描框的大小，去CameraManager里面修改		Rect frame = CameraManager.get().getFramingRect();		int top = frame.top;		int left = frame.left;		int right = frame.right;		int bottom = frame.bottom;		frame = new Rect(left , top, right , bottom );		// 初始化中间线滑动的最上边和最下边		if (!isFirst) {			isFirst = true;			slideTop = frame.top;			slideBottom = frame.bottom;		}		// 获取屏幕的宽和高		int width = canvas.getWidth();		int height = canvas.getHeight();		// 画出扫描框外面的阴影部分，共四个部分，扫描框的上面到屏幕上面，扫描框的下面到屏幕下面		// 扫描框的左边面到屏幕左边，扫描框的右边到屏幕右边		// Draw the exterior (i.e. outside the framing rect) darkened		paint.setColor(resultBitmap != null ? resultColor : maskColor);		canvas.drawRect(0, 0, width, frame.top, paint);		canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);		canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,				paint);		canvas.drawRect(0, frame.bottom + 1, width, height, paint);		if (resultBitmap != null) {			// Draw the opaque result bitmap over the scanning rectangle			paint.setAlpha(OPAQUE);			canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);		} else {			// 画扫描框边上的角，总共8个部分			paint.setColor(Color.GREEN);			canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,					frame.top + CORNER_WIDTH, paint);			canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top					+ ScreenRate, paint);			canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,					frame.top + CORNER_WIDTH, paint);			canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top					+ ScreenRate, paint);			canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left					+ ScreenRate, frame.bottom, paint);			canvas.drawRect(frame.left, frame.bottom - ScreenRate,					frame.left + CORNER_WIDTH, frame.bottom, paint);			canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,					frame.right, frame.bottom, paint);			canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,					frame.right, frame.bottom, paint);						//绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE						slideTop += SPEEN_DISTANCE;			if(slideTop >= frame.bottom){				slideTop = frame.top;			}			Rect lineRect = new Rect();              lineRect.left = frame.left;              lineRect.right = frame.right;              lineRect.top = slideTop;              lineRect.bottom = slideTop + 18;              canvas.drawBitmap(((BitmapDrawable)(getResources().getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null, lineRect, paint); 			        	//画扫描框下面的字//            paint.setColor(Color.WHITE);    //            paint.setTextSize(TEXT_SIZE * density);    //            paint.setAlpha(0x40);    //            paint.setTypeface(Typeface.create("System", Typeface.BOLD));   //            String text = "将二维码放入框内, 即可自动扫描";  //            float textWidth = paint.measureText(text);  //              //            canvas.drawText(text, (width - textWidth)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint); 									Collection<ResultPoint> currentPossible = possibleResultPoints;			Collection<ResultPoint> currentLast = lastPossibleResultPoints;			if (currentPossible.isEmpty()) {				lastPossibleResultPoints = null;			} else {				possibleResultPoints = new HashSet<ResultPoint>(5);				lastPossibleResultPoints = currentPossible;				paint.setAlpha(OPAQUE);				paint.setColor(resultPointColor);				for (ResultPoint point : currentPossible) {					canvas.drawCircle(frame.left + point.getX(), frame.top							+ point.getY(), 6.0f, paint);				}			}			if (currentLast != null) {				paint.setAlpha(OPAQUE / 2);				paint.setColor(resultPointColor);				for (ResultPoint point : currentLast) {					canvas.drawCircle(frame.left + point.getX(), frame.top							+ point.getY(), 3.0f, paint);				}			}						//只刷新扫描框的内容，其他地方不刷新			postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,					frame.right, frame.bottom);					}	}

public Rect getFramingRect() {    Point screenResolution = configManager.getScreenResolution();    if (framingRect == null) {      if (camera == null) {        return null;      }      /* 确定在固定比例分辨率下二维码扫描框的宽高*/        int width = screenResolution.x * 3 / 4;      if (width < MIN_FRAME_WIDTH) {        width = MIN_FRAME_WIDTH;      } else if (width > MAX_FRAME_WIDTH) {        width = MAX_FRAME_WIDTH;      }      int height = screenResolution.y * 3 / 4;      if (height < MIN_FRAME_HEIGHT) {        height = MIN_FRAME_HEIGHT;      } else if (height > MAX_FRAME_HEIGHT) {        height = MAX_FRAME_HEIGHT;      }      //计算x轴y轴坐标,可在此调整二维码框的位置      int leftOffset = (screenResolution.x - width) / 2 ;      int topOffset = ((screenResolution.y) /2 - height) / 2 ;      framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);      Log.d(TAG, "Calculated framing rect: " + framingRect);    }    return framingRect;  }

3、框中图片变形

/**	 * Sets the camera up to take preview images which are used for both preview	 * and decoding. We detect the preview format here so that	 * buildLuminanceSource() can build an appropriate LuminanceSource subclass.	 * In the future we may want to force YUV420SP as it's the smallest, and the	 * planar Y can be used for barcode scanning without a copy in some cases.	 */	void setDesiredCameraParameters(Camera camera) {		// Camera.Parameters parameters = camera.getParameters();		// Log.d(TAG, "Setting preview size: " + cameraResolution);		// parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);		// setFlash(parameters);		// setZoom(parameters);		// //setSharpness(parameters);		// //modify here		// camera.setDisplayOrientation(90);		// camera.setParameters(parameters);		Camera.Parameters parameters = camera.getParameters();		List<Size> supportedPreviewSizes = parameters				.getSupportedPreviewSizes();		int position = 0;		if (supportedPreviewSizes.size() > 2) {			position = supportedPreviewSizes.size() / 2 + 1;// supportedPreviewSizes.get();		} else {			position = supportedPreviewSizes.size() / 2;		}		int width = supportedPreviewSizes.get(position).width;		int height = supportedPreviewSizes.get(position).height;		Log.d(TAG, "Setting preview size: " + cameraResolution);		camera.setDisplayOrientation(90);		cameraResolution.x = width;		cameraResolution.y = height;		parameters.setPreviewSize(width, height);		setFlash(parameters);		setZoom(parameters);		// setSharpness(parameters);		camera.setParameters(parameters);	}

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