After ZXing, one-dimensional code, two-dimensional code, and other codes are scanned separately.

After ZXing, one-dimensional code, two-dimensional code, and other codes are scanned separately.

I have never touched on the QR code before. I recently encountered a problem: how can I determine whether the QR code is scanned by a QR code or by a QR code? after hard work for one afternoon, I can search online materials,

There are two ways to solve this problem (the second method is recommended ):

1. Modify the source code (as mentioned later)

2. Determine by the returned Encoding

Method 1:

The key to source code modification involves three classes: CaptureActivity, DecodeThread, and DecodeFormatManager.

1.First, let's take a look at the Zxing source code, which contains a DecodeFormatManager encoding management class: the original final class, because some parameters in the class need to be used, so we need to change it to a common class, however, I don't know whether the change will affect the original code structure. There are also several variables that are also constant type. here we need to change them to static type:

Public class DecodeFormatManager {// final class DecodeFormatManager {public static Vector <BarcodeFormat> PRODUCT_FORMATS; public static Vector <BarcodeFormat> ONE_D_FORMATS; public static Vector <BarcodeFormat> QR_CODE_FORMATS; public static Vector <BarcodeFormat> DATA_MATRIX_FORMATS; // static final Vector <BarcodeFormat> PRODUCT_FORMATS; // static final Vector <BarcodeFormat> ONE_D_FORMATS; // static final Vector <BarcodeFormat> QR_CODE_FORMATS; // static final Vector <BarcodeFormat> DATA_MATRIX_FORMATS; static {PRODUCT_FORMATS = new Vector <BarcodeFormat> (5); PRODUCT_FORMATS.add (BarcodeFormat. UPC_A); // UPC Standard Code (General Product) PRODUCT_FORMATS.add (BarcodeFormat. UPC_E); // UPC shortening code (commodity short code) PRODUCT_FORMATS.add (BarcodeFormat. EAN_13); PRODUCT_FORMATS.add (BarcodeFormat. EAN_8); PRODUCT_FORMATS.add (BarcodeFormat. RSS14); ONE_D_FORMATS = new Vector <BarcodeFormat> (PRODUCT_FORMATS.size () + 4); encode (PRODUCT_FORMATS); // Add the code added in PRODUCT_FORMATS to ONE_D_FORMATS ONE_D_FORMATS.add (BarcodeFormat. CODE_39); ONE_D_FORMATS.add (BarcodeFormat. CODE_93); ONE_D_FORMATS.add (BarcodeFormat. CODE_128); ONE_D_FORMATS.add (BarcodeFormat. ITF); QR_CODE_FORMATS = new Vector <BarcodeFormat> (1); // QR_CODE is the QR code QR_CODE_FORMATS.add (BarcodeFormat. QR_CODE); DATA_MATRIX_FORMATS = new Vector <BarcodeFormat> (1); DATA_MATRIX_FORMATS.add (BarcodeFormat. DATA_MATRIX); // a QR code }}

This class is mainly used to add some common bar code formats to the Vector <BarcodeFormat> set, which contains a dimension code and a QR code.

The last DATA_MATRIX is also a QR code.

2.After a while, DecodeThread. This is the decoding class.

We do not need to perform any operations here, as long as we know how to decode it here. The key point is here:

If (decodeFormats = null | decodeFormats. isEmpty () {decodeFormats = new Vector <BarcodeFormat> (); decodeFormats. addAll (DecodeFormatManager. ONE_D_FORMATS); // One-dimensional code decodeFormats. addAll (DecodeFormatManager. QR_CODE_FORMATS); // QR code decodeFormats. addAll (DecodeFormatManager. DATA_MATRIX_FORMATS );}

Here we add several constant classes that have been added to the decoding method, so that the decoding method has all the decoding formats, including the one-dimensional code and two-dimensional code.

3.The key point is CaptureActivity, a class that returns information after scanning.

Zxing source code is believed to be available to everyone, and we also know the value returned after scanning. There is a public void handleDecode (Result result, Bitmap barcode) in it. method,

The returned value is here:

// Scan result and code
Log. e ("encoding: ------>", result. getBarcodeFormat (). toString () + "data:" + result. getText ());

The key is this sentence:

Result. getBarcodeFormat (). toString () returns the encoding format;

Result. getText (); The returned value is the scan value.

Therefore, we need to determine whether the Vector Array in the encoding management class contains this field. iteration:

/*************************************** * ******* Note: in this example, the encoding format returned after the CAPTCHA is compared with the QR code encoding format in the DecodeFormatManager * class **. If the encoding format is the same as that in the DecodeFormatManager * class, the field is assigned a value of 1 (one-dimensional code) * If no, the field is assigned 2 (that is, the QR code) **************************************** * *****/int size = DecodeFormatManager. ONE_D_FORMATS.size (); // traverses the one-dimensional code character set for (int I = 0; I <size; I ++) {Log. e ("one-dimension code format ------>", DecodeFormatManager. ONE_D_FORMATS.get (I) + ""); // compare the encoding format returned after the CAPTCHA capture with the one-dimensional code encoding format in the DecodeFormatManager class. // If the encoding format is the same, the value of the field is 1 (that is, the one-dimensional code) otherwise, the field is assigned 2 (QR Code) if (DecodeFormatManager. ONE_D_FORMATS.get (I ). equals (mBarcodeFormat) {ONE_D_FORMATS = 1 ;}else {QR_CODE_FORMATS = 2 ;}}

Method 2:

Add two constants to the public void handleDecode (Result result, Bitmap barcode); method, and customize the QR_CODE and DATA_MATRIX constant codes. Then, when the scan returns, use the result. getBarcodeFormat (). toString () obtains the return code, and compares it with the custom code. Then define a string or int variable as the identifier, as shown below:

Int CODE_TYPE =-1; // indicates (1-dimension code, 2. Two-dimensional code 3. Other codes) final String QR_CODE = "QR_CODE "; // QR code final String DATA_MATRIX = "DATA_MATRIX"; // other codes // The scan code is not empty if (! TextUtils. isEmpty (result. getBarcodeFormat (). toString () {String mBarcodeFormat = result. getBarcodeFormat (). toString (); // The encoding format returned after the CAPTCHA capture is if (mBarcodeFormat. equals (DATA_MATRIX) {CODE_TYPE = 3;} else if (mBarcodeFormat. equals (QR_CODE) {CODE_TYPE = 2;} else {CODE_TYPE = 1;} Log. e ("---> (1-dimensional code, 2, two-dimensional code 3, other code)", "" + CODE_TYPE );

Then you can switch the CODE_TYPE label to determine which operations are performed.

Some bar code rules: