概述：

? 如果你下載了ZXing的源碼和ZXing的core.jar包，那么你現(xiàn)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(diào)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(xiàn)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?shù)胤庋b，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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