Android二维码开源项目zxing用例简化和生成二维码、条形码

上一篇讲到：Android二维码开源项目zxing编译，编译出来后有一个自带的測试程序：CaptureActivity比較复杂，我仅仅要是把一些不用的东西去掉，用看起来更方便，二维码和条形码的流行性自不必说了。

自带的样例，文件夹结构例如以下：

改动后的程序文件夹结构，去掉了非常多功能，假设分享、设置等。

先上效果图

扫描ZXing生成的条形码和二维码结果

扫描界面

扫描商品的条码

整个程序仅仅改动了下面两个类，其他都是直接从原来的Demo中复制出来的

生成二维码的代码

/** * 生成二维码 要转换的地址或字符串,能够是中文 *  * @param url * @param width * @param height * @return */public Bitmap createQRImage(String url, final int width, final int height) {try {// 推断URL合法性if (url == null || "".equals(url) || url.length() < 1) {return null;}Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");// 图像数据转换，使用了矩阵转换BitMatrix bitMatrix = new QRCodeWriter().encode(url,BarcodeFormat.QR_CODE, width, height, hints);int[] pixels = new int[width * height];// 以下这里依照二维码的算法，逐个生成二维码的图片，// 两个for循环是图片横列扫描的结果for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {if (bitMatrix.get(x, y)) {pixels[y * width + x] = 0xff000000;} else {pixels[y * width + x] = 0xffffffff;}}}// 生成二维码图片的格式，使用ARGB_8888Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;} catch (WriterException e) {e.printStackTrace();}return null;}

能够生成中文

生成条形码关键代码，下面代码是把条形码和条形码下的文字合并成一张图片显示。

/** * 生成条形码 *  * @param context * @param contents *            须要生成的内容 * @param desiredWidth *            生成条形码的宽带 * @param desiredHeight *            生成条形码的高度 * @param displayCode *            是否在条形码下方显示内容 * @return */public static Bitmap creatBarcode(Context context, String contents,int desiredWidth, int desiredHeight, boolean displayCode) {Bitmap ruseltBitmap = null;/** * 图片两端所保留的空白的宽度 */int marginW = 20;/** * 条形码的编码类型 */BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;if (displayCode) {Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,desiredWidth, desiredHeight);Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2* marginW, desiredHeight, context);ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(0, desiredHeight));} else {ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,desiredWidth, desiredHeight);}return ruseltBitmap;}/** * 生成条形码的Bitmap *  * @param contents *            须要生成的内容 * @param format *            编码格式 * @param desiredWidth * @param desiredHeight * @return * @throws WriterException */protected static Bitmap encodeAsBitmap(String contents,BarcodeFormat format, int desiredWidth, int desiredHeight) {final int WHITE = 0xFFFFFFFF;final int BLACK = 0xFF000000;MultiFormatWriter writer = new MultiFormatWriter();BitMatrix result = null;try {result = writer.encode(contents, format, desiredWidth,desiredHeight, null);} catch (WriterException e) {// TODO Auto-generated catch blocke.printStackTrace();}int width = result.getWidth();int height = result.getHeight();int[] pixels = new int[width * height];// All are 0, or black, by defaultfor (int y = 0; y < height; y++) {int offset = y * width;for (int x = 0; x < width; x++) {pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;}}Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}/** * 生成显示编码的Bitmap *  * @param contents * @param width * @param height * @param context * @return */protected static Bitmap creatCodeBitmap(String contents, int width,int height, Context context) {TextView tv = new TextView(context);LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);tv.setLayoutParams(layoutParams);tv.setText(contents);tv.setHeight(height);tv.setGravity(Gravity.CENTER_HORIZONTAL);tv.setWidth(width);tv.setDrawingCacheEnabled(true);tv.setTextColor(Color.BLACK);tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());tv.buildDrawingCache();Bitmap bitmapCode = tv.getDrawingCache();return bitmapCode;}/** * 将两个Bitmap合并成一个 *  * @param first * @param second * @param fromPoint *            第二个Bitmap開始绘制的起始位置（相对于第一个Bitmap） * @return */protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,PointF fromPoint) {if (first == null || second == null || fromPoint == null) {return null;}int marginW = 20;Bitmap newBitmap = Bitmap.createBitmap(first.getWidth() + second.getWidth() + marginW,first.getHeight() + second.getHeight(), Config.ARGB_4444);Canvas cv = new Canvas(newBitmap);cv.drawBitmap(first, marginW, 0, null);cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);cv.save(Canvas.ALL_SAVE_FLAG);cv.restore();return newBitmap;}

CaptureActivity.java是扫描二维码和条形码的界面，对Camera进行初始化和开启扫描线程

private void initCamera(SurfaceHolder surfaceHolder) {if (surfaceHolder == null) {throw new IllegalStateException("No SurfaceHolder provided");}if (cameraManager.isOpen()) {ZXingApplication.print_i("CaptureActivity","initCamera() while already open -- late SurfaceView callback?");return;}try {cameraManager.openDriver(surfaceHolder);} catch (IOException ioe) {return;} catch (RuntimeException e) {return;}if (handler == null) {handler = new CaptureActivityHandler(this, decodeFormats,decodeHints, characterSet, cameraManager);}ZXingApplication.print_i("CaptureActivity","initCamera-----------finish");}

在CaptureActivityHandler.java类中会处理扫描的结果

@Overridepublic void handleMessage(Message message) {switch (message.what) {case R.id.restart_preview:restartPreviewAndDecode();break;case R.id.decode_succeeded:state = State.SUCCESS;Bundle bundle = message.getData();Bitmap barcode = null;float scaleFactor = 1.0f;if (bundle != null) {byte[] compressedBitmap = bundle.getByteArray(DecodeThread.BARCODE_BITMAP);if (compressedBitmap != null) {barcode = BitmapFactory.decodeByteArray(compressedBitmap,0, compressedBitmap.length, null);// Mutable copy:barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);}scaleFactor = bundle.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);}activity.handleDecode((Result) message.obj, barcode, scaleFactor);break;case R.id.decode_failed:// We're decoding as fast as possible, so when one decode fails,// start another.state = State.PREVIEW;cameraManager.requestPreviewFrame(decodeThread.getHandler(),R.id.decode);break;case R.id.return_scan_result:activity.setResult(Activity.RESULT_OK, (Intent) message.obj);activity.finish();break;case R.id.launch_product_query:String url = (String) message.obj;Intent intent = new Intent(Intent.ACTION_VIEW);intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);intent.setData(Uri.parse(url));ResolveInfo resolveInfo = activity.getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);String browserPackageName = null;if (resolveInfo != null && resolveInfo.activityInfo != null) {browserPackageName = resolveInfo.activityInfo.packageName;Log.d(TAG, "Using browser in package " + browserPackageName);}// Needed for default Android browser / Chrome only apparentlyif ("com.android.browser".equals(browserPackageName)|| "com.android.chrome".equals(browserPackageName)) {intent.setPackage(browserPackageName);intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);intent.putExtra(Browser.EXTRA_APPLICATION_ID,browserPackageName);}try {activity.startActivity(intent);} catch (ActivityNotFoundException ignored) {Log.w(TAG, "Can't find anything to handle VIEW of URI " + url);}break;}}

在case R.id.decode_succeeded 分支会通过activity.handleDecode((Result) message.obj, barcode, scaleFactor);回传结果给Activity

/** * A valid barcode has been found, so give an indication of success and show * the results. *  * @param rawResult *            The contents of the barcode. * @param scaleFactor *            amount by which thumbnail was scaled * @param barcode *            A greyscale bitmap of the camera data which was decoded. */public void handleDecode(final Result rawResult, Bitmap barcode,float scaleFactor) {inactivityTimer.onActivity();// ResultHandler resultHandler = ResultHandlerFactory.makeResultHandler(// this, rawResult);boolean fromLiveScan = barcode != null;AlertDialog.Builder dialog = new AlertDialog.Builder(this);if (barcode == null) {dialog.setIcon(null);} else {Drawable drawable = new BitmapDrawable(barcode);dialog.setIcon(drawable);}dialog.setTitle("扫描结果");dialog.setMessage(rawResult.getText());dialog.setNegativeButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 用默认浏览器打开扫描得到的地址Intent intent = new Intent();intent.setAction("android.intent.action.VIEW");Uri content_url = Uri.parse(rawResult.getText());intent.setData(content_url);startActivity(intent);finish();}});dialog.setPositiveButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {finish();}});dialog.create().show();}

这里仅仅是把扫描的结果显示出来，实际上能够依据不同的须要来处理，假设扫描出二维码能够用HTTP来打开，有一点要注意的，我的ADT版本号是V23.0.2.1259578，须要执行的4.0的系统上

演示样例代码：http://download.csdn.net/detail/deng0zhaotai/7696615

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