上一篇讲到：，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
     
       hints = new Hashtable
      
       ();			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_8888			Bitmap 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 block			e.printStackTrace();		}		int width = result.getWidth();		int height = result.getHeight();		int[] pixels = new int[width * height];		// All are 0, or black, by default		for (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

@Override	public 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 apparently			if ("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() {			@Override			public 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() {			@Override			public 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：