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_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：http://download.csdn.net/detail/deng0zhaotai/7696615
