概述：

? 如果你下載了ZXing的源碼和ZXing的core.jar包，那么你現在就可以進行如下的一系列修改來自定義你的二維碼掃描了。

本文鏈接：http://blog.csdn.net/lemon_tree12138/article/details/47088951 -- Coding-Naga
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?--轉載請注明出處

1.修改橫豎屏

? 這一步其實是相對來說還是比較復雜的。因為這里需要針對兩個不同方面進行修改，一個是橫豎屏的切換，另一個是圖像伸縮的修改。

? (1)修改Manifest中CaptureActivity類的屬性為android:screenOrientation="sensor"

? (2)修改CaptureActivity類，在onResume方法中調用下面的代碼：

private void setOrientation() {WindowManager manager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);mRotation = manager.getDefaultDisplay().getRotation();boolean orientationFlag = true;int screenState = CaptureActivity.this.getResources().getConfiguration().orientation;if (screenState == Configuration.ORIENTATION_LANDSCAPE){orientationFlag = false;mOrientationFlag = false;} else if (screenState ==Configuration.ORIENTATION_PORTRAIT) {orientationFlag = true;mOrientationFlag = true;}EventBus.getDefault().post(orientationFlag, RESET_ORIENTATION);}

? (3)修改DecodeHandler類

? 在如下代碼

<span style="font-family:Courier New;font-size:14px;">PlanarYUVLuminanceSource source = activity.getCameraManager().buildLuminanceSource(data, width, height);</span>

的上方添加以下代碼：

if (mPortraitFlag) {byte[] rotatedData = new byte[data.length];for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++)rotatedData[x * height + height - y - 1] = data[x + y * width];}int tmp = width; // Here we are swapping, that's the difference to #11width = height;height = tmp;data = rotatedData;} mPortraitFlag的獲得是通過Android的總線事件來獲得：

@Subscriber(tag = "reset_orientation")private void updateFlag(boolean flag) {mPortraitFlag = flag;} ? (4)在CameraConfigurationManager類的initFromCameraParameters方法中

? Point screenResolutionForCamera = new Point();代碼的下面添加如下代碼：

if (CaptureActivity.getOrientationFlag()) {screenResolutionForCamera.x = screenResolution.x;screenResolutionForCamera.y = screenResolution.y;if (screenResolution.x < screenResolution.y) {screenResolutionForCamera.x = screenResolution.y;screenResolutionForCamera.y = screenResolution.x;}cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, screenResolutionForCamera);} else {cameraResolution = CameraConfigurationUtils.findBestPreviewSizeValue(parameters, screenResolution); }

? (5)在CameraConfigurationManager類的setDesiredCameraParameters方法中

? camera.setParameters(parameters);代碼的上面添加如下代碼：

String model = android.os.Build.MODEL;int extraAngle = 0;if (model.equalsIgnoreCase("MediaPad 10 FHD")) {extraAngle = -90;} else if (model.startsWith("EBEN")) {extraAngle = -90;}switch (CaptureActivity.getRotationFlag()) {case Surface.ROTATION_0:camera.setDisplayOrientation((360 + 90 + extraAngle) % 360);break;case Surface.ROTATION_90:camera.setDisplayOrientation((360 + 0 + extraAngle) % 360);break;case Surface.ROTATION_180:camera.setDisplayOrientation((360 + 270 + extraAngle) % 360);break;case Surface.ROTATION_270:camera.setDisplayOrientation((360 + 180 + extraAngle) % 360);break;default:break;} 這里是對部分機型進行了一個簡單的適配。

? (6)在CameraManager類的getFramingRectInPreview方法中作如下修改：

if (mPortraitFlag) {rect.left = rect.left * cameraResolution.y / screenResolution.x;rect.right = rect.right * cameraResolution.y / screenResolution.x;rect.top = rect.top * cameraResolution.x / screenResolution.y;rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;} else {rect.left = rect.left * cameraResolution.x / screenResolution.x;rect.right = rect.right * cameraResolution.x /screenResolution.x;rect.top = rect.top * cameraResolution.y / screenResolution.y;rect.bottom = rect.bottom * cameraResolution.y /screenResolution.y;}

2.修改掃描矩形的邊框大小

? 我們通過CameraManager類中的findDesiredDimensionInRange方法來修改掃描矩形的大小和邊長比例。

??int dim = 5 * resolution / 8;

? 上面代碼中5和8就是用來修改這個矩形大小的值，你可以嘗試著來實踐一下。

3.修改掃描結果的字符編碼

? 第1步：

? 在com.google.zxing.client.android.CaptureActivity類中，將

? ?characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);

? 這一句修改為：

? ?characterSet = "ISO-8859-1";

? 第2步：

? 在handleDecodeInternally方法中，修改如下代碼：

CharSequence displayContents = resultHandler.getDisplayContents();String decodeContent = "";try {decodeContent = new String(displayContents.toString().getBytes(characterSet), "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();} ? 以上兩步就是把編碼格式轉換為了UTF-8格式了。

4.添加掃描矩形的四個邊角

? 針對com.google.zxing.client.android包下ViewfinderView類

/*** 繪制掃描框上的四個邊角* @param canvas* @param frame*/private void drawFourCorner(Canvas canvas, Rect frame) {paint.setColor(getResources().getColor(R.color.green));// 左上角canvas.drawRect(frame.left, frame.top, frame.left + 30, frame.top + 10, paint);canvas.drawRect(frame.left, frame.top, frame.left + 10, frame.top + 30, paint);// 右上角canvas.drawRect(frame.right - 30, frame.top, frame.right, frame.top + 10, paint);canvas.drawRect(frame.right - 10, frame.top, frame.right, frame.top + 30, paint);// 左下角canvas.drawRect(frame.left, frame.bottom - 10, frame.left + 30, frame.bottom, paint);canvas.drawRect(frame.left, frame.bottom - 30, frame.left + 10, frame.bottom, paint);// 右下角canvas.drawRect(frame.right - 30, frame.bottom - 10, frame.right,frame.bottom, paint);canvas.drawRect(frame.right - 10, frame.bottom - 30, frame.right,frame.bottom, paint);}

效果：

? ????

5.修改掃描矩形中的線條

? 這里我們通過三種方式來顯示掃描線條：

? (1)原生的紅色線條

? (2)自定義的一個會移動的線條

? (3)自定義一張會移動的圖片

? 實現代碼如下：

? (1)原生的紅色線條

? ? ?這里沒有做什么特別地修改，只是對繪制線條的這一模塊進行了一個適當地封裝，為了更好地讓“用戶”去選擇應該使用哪一個線條更合適。

/*** 原生的掃描線條* * @param canvas* @param frame*/private void drawSlidingRawLine(Canvas canvas, Rect frame) {Rect previewFrame = cameraManager.getFramingRectInPreview();paint.setColor(laserColor);paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;int middle = frame.height() / 2 + frame.top;canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1,middle + 2, paint);float scaleX = frame.width() / (float) previewFrame.width();float scaleY = frame.height() / (float) previewFrame.height();List<ResultPoint> currentPossible = possibleResultPoints;List<ResultPoint> currentLast = lastPossibleResultPoints;int frameLeft = frame.left;int frameTop = frame.top;if (currentPossible.isEmpty()) {lastPossibleResultPoints = null;} else {possibleResultPoints = new ArrayList<ResultPoint>(5);lastPossibleResultPoints = currentPossible;paint.setAlpha(CURRENT_POINT_OPACITY);paint.setColor(resultPointColor);synchronized (currentPossible) {for (ResultPoint point : currentPossible) {canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop+ (int) (point.getY() * scaleY),POINT_SIZE, paint);}}}if (currentLast != null) {paint.setAlpha(CURRENT_POINT_OPACITY / 2);paint.setColor(resultPointColor);synchronized (currentLast) {float radius = POINT_SIZE / 2.0f;for (ResultPoint point : currentLast) {canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop+ (int) (point.getY() * scaleY), radius,paint);}}}} ? (2)自定義的一個會移動的線條

/*** 以下為用漸變線條作為掃描線* * @param canvas* @param frame*/private void drawSlidingSolidLine(Canvas canvas, Rect frame) {// 漸變圖為矩形mDrawable.setShape(GradientDrawable.RECTANGLE);// 漸變圖為線型mDrawable.setGradientType(GradientDrawable.LINEAR_GRADIENT);// 線型矩形的四個圓角半徑mDrawable.setCornerRadii(new float[] { 8, 8, 8, 8, 8, 8, 8, 8 });// 位置邊界mRect.set(frame.left + 10, frame.top + i, frame.right - 10, frame.top + 3 + i);// 設置漸變圖填充邊界mDrawable.setBounds(mRect);// 畫出漸變線條mDrawable.draw(canvas);} ? (3)自定義一張會移動的圖片

/*** 以下為圖片作為掃描線* * @param canvas* @param frame*/private void drawSlidingImage(Canvas canvas, Rect frame) {mRect.set(frame.left - 6, frame.top + i - 6, frame.right + 6, frame.top+ 6 + i);lineDrawable.setBounds(mRect);lineDrawable.draw(canvas);}

總結

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