1 rect.left = rect.left * cameraResolution.y / screenResolution.x;2             rect.right = rect.right * cameraResolution.y / screenResolution.x;3             rect.top = rect.top * cameraResolution.x / screenResolution.y;4             rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;

 1 void setDisplayOrientation(Camera camera, int angle) { 2  3         Method method; 4         try { 5             method = camera.getClass().getMethod("setDisplayOrientation", 6                     new Class[] { int.class }); 7             if (method != null) 8                 method.invoke(camera, new Object[] { angle }); 9         } catch (Exception e1) {10             e1.printStackTrace();11         }12     }

1 byte[] rotatedData = http://www.mamicode.com/new byte[data.length];   2          for (int y = 0; y < height; y++) {   3          for (int x = 0; x < width; x++)   4          rotatedData[x * height + height - y - 1] = data[x + y * width];   5          }   6          int tmp = width; // Here we are swapping, that‘s the difference to #11   7          width = height;   8          height = tmp;   9          data = http://www.mamicode.com/rotatedData;  

 1 void initFromCameraParameters(Camera camera) { 2         Camera.Parameters parameters = camera.getParameters(); 3         WindowManager manager = (WindowManager) context 4                 .getSystemService(Context.WINDOW_SERVICE); 5         Display display = manager.getDefaultDisplay(); 6         Point theScreenResolution = new Point(display.getWidth(), 7                 display.getHeight()); 8         screenResolution = theScreenResolution; 9         Log.i(TAG, "Screen resolution: " + screenResolution);10 11         /************** 竖屏更改4 ******************/12         Point screenResolutionForCamera = new Point();13         screenResolutionForCamera.x = screenResolution.x;14         screenResolutionForCamera.y = screenResolution.y;15 16         // preview size is always something like 480*320, other 320*48017         if (screenResolution.x < screenResolution.y) {18             screenResolutionForCamera.x = screenResolution.y;19             screenResolutionForCamera.y = screenResolution.x;20         }21 22         cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(23                 parameters, screenResolutionForCamera);24         Log.i(TAG, "Camera resolution: " + cameraResolution);25 26     }

 1 private void drawStatusText(Canvas canvas, Rect frame, int width) { 2  3         String statusText1 = getResources().getString( 4                 R.string.viewfinderview_status_text1); 5         String statusText2 = getResources().getString( 6                 R.string.viewfinderview_status_text2); 7         int statusTextSize = 45; 8         int statusPaddingTop = 180; 9 10         paint.setColor(statusColor);11         paint.setTextSize(statusTextSize);12 13         int textWidth1 = (int) paint.measureText(statusText1);14         canvas.drawText(statusText1, (width - textWidth1) / 2, frame.top15                 - statusPaddingTop, paint);16 17         int textWidth2 = (int) paint.measureText(statusText2);18         canvas.drawText(statusText2, (width - textWidth2) / 2, frame.top19                 - statusPaddingTop + 60, paint);20     }

 1 private void drawFrameBounds(Canvas canvas, Rect frame) { 2  3         paint.setColor(Color.WHITE); 4         paint.setStrokeWidth(2); 5         paint.setStyle(Paint.Style.STROKE); 6  7         canvas.drawRect(frame, paint); 8  9         paint.setColor(Color.BLUE);10         paint.setStyle(Paint.Style.FILL);11 12         int corWidth = 15;13         int corLength = 45;14 15         // 左上角16         canvas.drawRect(frame.left - corWidth, frame.top, frame.left, frame.top17                 + corLength, paint);18         canvas.drawRect(frame.left - corWidth, frame.top - corWidth, frame.left19                 + corLength, frame.top, paint);20         // 右上角21         canvas.drawRect(frame.right, frame.top, frame.right + corWidth,22                 frame.top + corLength, paint);23         canvas.drawRect(frame.right - corLength, frame.top - corWidth,24                 frame.right + corWidth, frame.top, paint);25         // 左下角26         canvas.drawRect(frame.left - corWidth, frame.bottom - corLength,27                 frame.left, frame.bottom, paint);28         canvas.drawRect(frame.left - corWidth, frame.bottom, frame.left29                 + corLength, frame.bottom + corWidth, paint);30         // 右下角31         canvas.drawRect(frame.right, frame.bottom - corLength, frame.right32                 + corWidth, frame.bottom, paint);33         canvas.drawRect(frame.right - corLength, frame.bottom, frame.right34                 + corWidth, frame.bottom + corWidth, paint);35     }

 1 private void drawScanLight(Canvas canvas, Rect frame) { 2  3         if (scanLineTop == 0) { 4             scanLineTop = frame.top; 5         } 6  7         if (scanLineTop >= frame.bottom) { 8             scanLineTop = frame.top; 9         } else {10             scanLineTop += SCAN_VELOCITY;11         }12         Rect scanRect = new Rect(frame.left, scanLineTop, frame.right,13                 scanLineTop + 30);14         canvas.drawBitmap(scanLight, null, scanRect, paint);15     }

  1 /**  2  * This view is overlaid on top of the camera preview. It adds the viewfinder  3  * rectangle and partial transparency outside it, as well as the laser scanner  4  * animation and result points. 这是一个位于相机顶部的预览view,它增加了一个外部部分透明的取景框，以及激光扫描动画和结果组件  5  *   6  * @author dswitkin@google.com (Daniel Switkin)  7  */  8 public final class ViewfinderView extends View {  9  10     private static final int[] SCANNER_ALPHA = { 0, 64, 128, 192, 255, 192, 11             128, 64 }; 12     private static final long ANIMATION_DELAY = 80L; 13     private static final int CURRENT_POINT_OPACITY = 0xA0; 14     private static final int MAX_RESULT_POINTS = 20; 15     private static final int POINT_SIZE = 6; 16  17     private CameraManager cameraManager; 18     private final Paint paint; 19     private Bitmap resultBitmap; 20     private final int maskColor; // 取景框外的背景颜色 21     private final int resultColor;// result Bitmap的颜色 22     private final int laserColor; // 红色扫描线的颜色 23     private final int resultPointColor; // 特征点的颜色 24     private final int statusColor; // 提示文字颜色 25     private int scannerAlpha; 26     private List<ResultPoint> possibleResultPoints; 27     private List<ResultPoint> lastPossibleResultPoints; 28     // 扫描线移动的y 29     private int scanLineTop; 30     // 扫描线移动速度 31     private final int SCAN_VELOCITY = 5; 32     // 扫描线 33     Bitmap scanLight; 34  35     public ViewfinderView(Context context, AttributeSet attrs) { 36         super(context, attrs); 37  38         // Initialize these once for performance rather than calling them every 39         // time in onDraw(). 40         paint = new Paint(Paint.ANTI_ALIAS_FLAG); 41         Resources resources = getResources(); 42         maskColor = resources.getColor(R.color.viewfinder_mask); 43         resultColor = resources.getColor(R.color.result_view); 44         laserColor = resources.getColor(R.color.viewfinder_laser); 45         resultPointColor = resources.getColor(R.color.possible_result_points); 46         statusColor = resources.getColor(R.color.status_text); 47         scannerAlpha = 0; 48         possibleResultPoints = new ArrayList<ResultPoint>(5); 49         lastPossibleResultPoints = null; 50         scanLight = BitmapFactory.decodeResource(resources, 51                 R.drawable.scan_light); 52     } 53  54     public void setCameraManager(CameraManager cameraManager) { 55         this.cameraManager = cameraManager; 56     } 57  58     @SuppressLint("DrawAllocation") 59     @Override 60     public void onDraw(Canvas canvas) { 61         if (cameraManager == null) { 62             return; // not ready yet, early draw before done configuring 63         } 64  65         // frame为取景框 66         Rect frame = cameraManager.getFramingRect(); 67         Rect previewFrame = cameraManager.getFramingRectInPreview(); 68         if (frame == null || previewFrame == null) { 69             return; 70         } 71         int width = canvas.getWidth(); 72         int height = canvas.getHeight(); 73  74         // Draw the exterior (i.e. outside the framing rect) darkened 75         // 绘制取景框外的暗灰色的表面，分四个矩形绘制 76         paint.setColor(resultBitmap != null ? resultColor : maskColor); 77         canvas.drawRect(0, 0, width, frame.top, paint);// Rect_1 78         canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint); // Rect_2 79         canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, 80                 paint); // Rect_3 81         canvas.drawRect(0, frame.bottom + 1, width, height, paint); // Rect_4 82  83         if (resultBitmap != null) { 84             // Draw the opaque result bitmap over the scanning rectangle 85             // 如果有二维码结果的Bitmap，在扫取景框内绘制不透明的result Bitmap 86             paint.setAlpha(CURRENT_POINT_OPACITY); 87             canvas.drawBitmap(resultBitmap, null, frame, paint); 88         } else { 89             // Draw a red "laser scanner" line through the middle to show 90             // decoding is active 91             drawFrameBounds(canvas, frame); 92             drawStatusText(canvas, frame, width); 93  94             // 绘制扫描线 95             // paint.setColor(laserColor); 96             // paint.setAlpha(SCANNER_ALPHA[scannerAlpha]); 97             // scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length; 98             // int middle = frame.height() / 2 + frame.top; 99             // canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1,100             // middle + 2, paint);101 102             drawScanLight(canvas, frame);103 104             float scaleX = frame.width() / (float) previewFrame.width();105             float scaleY = frame.height() / (float) previewFrame.height();106 107             // 绘制扫描线周围的特征点108             List<ResultPoint> currentPossible = possibleResultPoints;109             List<ResultPoint> currentLast = lastPossibleResultPoints;110             int frameLeft = frame.left;111             int frameTop = frame.top;112             if (currentPossible.isEmpty()) {113                 lastPossibleResultPoints = null;114             } else {115                 possibleResultPoints = new ArrayList<ResultPoint>(5);116                 lastPossibleResultPoints = currentPossible;117                 paint.setAlpha(CURRENT_POINT_OPACITY);118                 paint.setColor(resultPointColor);119                 synchronized (currentPossible) {120                     for (ResultPoint point : currentPossible) {121                         canvas.drawCircle(frameLeft122                                 + (int) (point.getX() * scaleX), frameTop123                                 + (int) (point.getY() * scaleY), POINT_SIZE,124                                 paint);125                     }126                 }127             }128             if (currentLast != null) {129                 paint.setAlpha(CURRENT_POINT_OPACITY / 2);130                 paint.setColor(resultPointColor);131                 synchronized (currentLast) {132                     float radius = POINT_SIZE / 2.0f;133                     for (ResultPoint point : currentLast) {134                         canvas.drawCircle(frameLeft135                                 + (int) (point.getX() * scaleX), frameTop136                                 + (int) (point.getY() * scaleY), radius, paint);137                     }138                 }139             }140 141             // Request another update at the animation interval, but only142             // repaint the laser line,143             // not the entire viewfinder mask.144             postInvalidateDelayed(ANIMATION_DELAY, frame.left - POINT_SIZE,145                     frame.top - POINT_SIZE, frame.right + POINT_SIZE,146                     frame.bottom + POINT_SIZE);147         }148     }149 150     /**151      * 绘制取景框边框152      * 153      * @param canvas154      * @param frame155      */156     private void drawFrameBounds(Canvas canvas, Rect frame) {157 158         paint.setColor(Color.WHITE);159         paint.setStrokeWidth(2);160         paint.setStyle(Paint.Style.STROKE);161 162         canvas.drawRect(frame, paint);163 164         paint.setColor(Color.BLUE);165         paint.setStyle(Paint.Style.FILL);166 167         int corWidth = 15;168         int corLength = 45;169 170         // 左上角171         canvas.drawRect(frame.left - corWidth, frame.top, frame.left, frame.top172                 + corLength, paint);173         canvas.drawRect(frame.left - corWidth, frame.top - corWidth, frame.left174                 + corLength, frame.top, paint);175         // 右上角176         canvas.drawRect(frame.right, frame.top, frame.right + corWidth,177                 frame.top + corLength, paint);178         canvas.drawRect(frame.right - corLength, frame.top - corWidth,179                 frame.right + corWidth, frame.top, paint);180         // 左下角181         canvas.drawRect(frame.left - corWidth, frame.bottom - corLength,182                 frame.left, frame.bottom, paint);183         canvas.drawRect(frame.left - corWidth, frame.bottom, frame.left184                 + corLength, frame.bottom + corWidth, paint);185         // 右下角186         canvas.drawRect(frame.right, frame.bottom - corLength, frame.right187                 + corWidth, frame.bottom, paint);188         canvas.drawRect(frame.right - corLength, frame.bottom, frame.right189                 + corWidth, frame.bottom + corWidth, paint);190     }191 192     /**193      * 绘制提示文字194      * 195      * @param canvas196      * @param frame197      * @param width198      */199     private void drawStatusText(Canvas canvas, Rect frame, int width) {200 201         String statusText1 = getResources().getString(202                 R.string.viewfinderview_status_text1);203         String statusText2 = getResources().getString(204                 R.string.viewfinderview_status_text2);205         int statusTextSize = 45;206         int statusPaddingTop = 180;207 208         paint.setColor(statusColor);209         paint.setTextSize(statusTextSize);210 211         int textWidth1 = (int) paint.measureText(statusText1);212         canvas.drawText(statusText1, (width - textWidth1) / 2, frame.top213                 - statusPaddingTop, paint);214 215         int textWidth2 = (int) paint.measureText(statusText2);216         canvas.drawText(statusText2, (width - textWidth2) / 2, frame.top217                 - statusPaddingTop + 60, paint);218     }219 220     /**221      * 绘制移动扫描线222      * 223      * @param canvas224      * @param frame225      */226     private void drawScanLight(Canvas canvas, Rect frame) {227 228         if (scanLineTop == 0) {229             scanLineTop = frame.top;230         }231 232         if (scanLineTop >= frame.bottom) {233             scanLineTop = frame.top;234         } else {235             scanLineTop += SCAN_VELOCITY;236         }237         Rect scanRect = new Rect(frame.left, scanLineTop, frame.right,238                 scanLineTop + 30);239         canvas.drawBitmap(scanLight, null, scanRect, paint);240     }241 242     public void drawViewfinder() {243         Bitmap resultBitmap = this.resultBitmap;244         this.resultBitmap = null;245         if (resultBitmap != null) {246             resultBitmap.recycle();247         }248         invalidate();249     }250 251     /**252      * Draw a bitmap with the result points highlighted instead of the live253      * scanning display.254      * 255      * @param barcode256      *            An image of the decoded barcode.257      */258     public void drawResultBitmap(Bitmap barcode) {259         resultBitmap = barcode;260         invalidate();261     }262 263     public void addPossibleResultPoint(ResultPoint point) {264         List<ResultPoint> points = possibleResultPoints;265         synchronized (points) {266             points.add(point);267             int size = points.size();268             if (size > MAX_RESULT_POINTS) {269                 // trim it270                 points.subList(0, size - MAX_RESULT_POINTS / 2).clear();271             }272         }273     }274 275 }