在菲律宾做网站推广怎么样,源创派网站建设,建设网站需要备案,网站开发思路对于Zxing开源项目的简化上文已给出#xff0c;源码经过测试且不断修改。众所周知#xff0c;Zxing项目的扫描是横向的#xff0c;这么引用的用户体验确实不好#xff1b;然而盲目的修改会出现拉伸以及样本采集的偏离。所以这里说一下如何将横屏修改为竖屏扫描 解决办法引用… 对于Zxing开源项目的简化上文已给出源码经过测试且不断修改。众所周知Zxing项目的扫描是横向的这么引用的用户体验确实不好然而盲目的修改会出现拉伸以及样本采集的偏离。所以这里说一下如何将横屏修改为竖屏扫描 解决办法引用原文http://blog.csdn.net/aaawqqq/article/details/24804939 一、Zxing扫描框架竖屏切换 1、menifest.xml中Activitiy必须要设为竖屏的添加属性 android:screenOrientationportrait 2、camera扫描过程中有两个视图当前扫描view(取景框)和预览preview。为了修正预览的90度的偏离我们需要修正PreView。因此我们要修改CameraManager中的 getFramingRectInPreview的preView的边框 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; View Code 3、在CameraConfigurationManager中setDesiredCameraParameters设置我们需要设置的Camera参数设置preView大小因此我们我们需要在这里添加 setDisplayOrientation来设置camera旋转90度旋转调用位置setDesiredCameraParameters中camera.setParameters(parameters)之前 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 } View Code 4、在DecodeHandler中decode(byte[] data, int width, int height)在PlanarYUVLuminanceSource source activity.getCameraManager().buildLuminanceSource(data, width, height)之前添加以下代码防止转化的bitmap与取景框得到的扫描图不一致 1 byte[] rotatedData 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, thats the difference to #11
7 width height;
8 height tmp;
9 data rotatedData; View Code 5、在CameraConfigurationManager中initFromCameraParameters(Camera camera)替换为如下代码 1 void initFromCameraParameters(Camera camera) {2 Camera.Parameters parameters camera.getParameters();3 WindowManager manager (WindowManager) context4 .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*480
17 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 } View Code 非常感谢NDK-baozi的解决方法 二、解决自定义取景框的问题 Zxing中在取景框中央的红色扫描线或许跟我们需要的循环移动扫描还有些出入这就需要我们来自定义属于自己的取景框。实现自定义取景框我们需要改写ViewfinderView来绘制自 己的View。 首先需要确定一点在Zxing源代码中有两个Rect:一个是frame通过getFramingRect取得这是我们要的取景框的Rect;而另一个previewFrame则是预览视图。我们要做的是以frame为参照物进行我们自己的绘制。 1、绘制描述的文字也即取景框上方的提示消息 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.top
15 - statusPaddingTop, paint);
16
17 int textWidth2 (int) paint.measureText(statusText2);
18 canvas.drawText(statusText2, (width - textWidth2) / 2, frame.top
19 - statusPaddingTop 60, paint);
20 } View Code 2、绘制取景框边角也即四个角的蓝色拐角 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.top
17 corLength, paint);
18 canvas.drawRect(frame.left - corWidth, frame.top - corWidth, frame.left
19 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.left
29 corLength, frame.bottom corWidth, paint);
30 // 右下角
31 canvas.drawRect(frame.right, frame.bottom - corLength, frame.right
32 corWidth, frame.bottom, paint);
33 canvas.drawRect(frame.right - corLength, frame.bottom, frame.right
34 corWidth, frame.bottom corWidth, paint);
35 } View Code 3、绘制循环移动的扫描线 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 } View Code 通过以上的三步绘制我们就可以实现展示图的效果。整体的ViewfinderView代码 1 /**2 * This view is overlaid on top of the camera preview. It adds the viewfinder3 * rectangle and partial transparency outside it, as well as the laser scanner4 * 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 dswitkingoogle.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 ListResultPoint possibleResultPoints;27 private ListResultPoint lastPossibleResultPoints;28 // 扫描线移动的y29 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 every39 // 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 ArrayListResultPoint(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 Override60 public void onDraw(Canvas canvas) {61 if (cameraManager null) {62 return; // not ready yet, early draw before done configuring63 }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) darkened75 // 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_178 canvas.drawRect(0, frame.top, frame.left, frame.bottom 1, paint); // Rect_279 canvas.drawRect(frame.right 1, frame.top, width, frame.bottom 1,80 paint); // Rect_381 canvas.drawRect(0, frame.bottom 1, width, height, paint); // Rect_482 83 if (resultBitmap ! null) {84 // Draw the opaque result bitmap over the scanning rectangle85 // 如果有二维码结果的Bitmap在扫取景框内绘制不透明的result Bitmap86 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 show90 // decoding is active91 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 ListResultPoint currentPossible possibleResultPoints;
109 ListResultPoint currentLast lastPossibleResultPoints;
110 int frameLeft frame.left;
111 int frameTop frame.top;
112 if (currentPossible.isEmpty()) {
113 lastPossibleResultPoints null;
114 } else {
115 possibleResultPoints new ArrayListResultPoint(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(frameLeft
122 (int) (point.getX() * scaleX), frameTop
123 (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(frameLeft
135 (int) (point.getX() * scaleX), frameTop
136 (int) (point.getY() * scaleY), radius, paint);
137 }
138 }
139 }
140
141 // Request another update at the animation interval, but only
142 // 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 canvas
154 * param frame
155 */
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.top
172 corLength, paint);
173 canvas.drawRect(frame.left - corWidth, frame.top - corWidth, frame.left
174 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.left
184 corLength, frame.bottom corWidth, paint);
185 // 右下角
186 canvas.drawRect(frame.right, frame.bottom - corLength, frame.right
187 corWidth, frame.bottom, paint);
188 canvas.drawRect(frame.right - corLength, frame.bottom, frame.right
189 corWidth, frame.bottom corWidth, paint);
190 }
191
192 /**
193 * 绘制提示文字
194 *
195 * param canvas
196 * param frame
197 * param width
198 */
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.top
213 - statusPaddingTop, paint);
214
215 int textWidth2 (int) paint.measureText(statusText2);
216 canvas.drawText(statusText2, (width - textWidth2) / 2, frame.top
217 - statusPaddingTop 60, paint);
218 }
219
220 /**
221 * 绘制移动扫描线
222 *
223 * param canvas
224 * param frame
225 */
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 live
253 * scanning display.
254 *
255 * param barcode
256 * 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 ListResultPoint points possibleResultPoints;
265 synchronized (points) {
266 points.add(point);
267 int size points.size();
268 if (size MAX_RESULT_POINTS) {
269 // trim it
270 points.subList(0, size - MAX_RESULT_POINTS / 2).clear();
271 }
272 }
273 }
274
275 } View Code 转载于:https://www.cnblogs.com/kipMeister/p/4123676.html
