Android generates a QR code with an image,
In development, we need to convert the information into two-dimensional code storage and require the company logo. We know that Google's Zxing open-source project can help us to generate and parse the barcode and two-dimensional code, however, the official website with a logo does not provide a demo. The following describes how to implement and use Zxing through examples.
1. Case Running Effect
2. case preparation
To add jar to a project, you only need to add core. jar
Zxing project: https://github.com/zxing/zxing/
| Iii. Main Zxing Components |
1. BarcodeFormat
Different binary encoding methods are defined. The values are as follows:
EAN_13 bar code, a total of 13 codes, more common, such as the packaging on the product is such a bar code
CODE_QR code (Matrix Code) is more popular than bar code.
The CODE_128 barcode can contain 127 characters from ASCII 0 to ASCII 128. It is used for enterprise management and production process control.
CODE_39 barcode. The compilation simply accepts the following 43 characters:
2. MultiFormatWriter
It mainly includes an encode () method to generate code (bar and QR code)
BitMatrix encode (String contents, BarcodeFormat format, int width, int height, Hashtable hints) Method
Parameters:
Contents: content to be encoded
Format: encoding format (Bar, two-dimensional)
Width, height: the size of the generated code
Hints: a collection of EncodeHintType information. It mainly sets character encoding. For example, UTF-8 of Chinese characters is supported, as shown below:
Hashtable <EncodeHintType, String> hst = new Hashtable <EncodeHintType, String> ();
Hst. put (EncodeHintType. CHARACTER_SET, "UTF-8 ");
Return Value: BitMatrix two-dimensional matrix point
3. BitMatrix
BitMatrix: a two-dimensional matrix. x indicates the position of the column, and y indicates the position of the row. The column is arranged in sequence from the upper left corner (x to y)
Main Method:
GetWidth (): returns the width of the matrix.
GetHeight (): returns the height of the matrix.
Boolean get (x, y): a very important method to determine whether a Black Block exists at the position based on the given x and y.
In the application that generates a QR code, this method is used to determine, record the points with Black Blocks, generate a graph using the setPixels () method of Bitmap, and illustrate the createCode () method of the case () code in the Method
Public class MainActivity extends Activity {private EditText etCompany; private EditText etPhone; private EditText etEmail; private EditText etWeb; private Bitmap logo; private static final int IMAGE_HALFWIDTH = 40; // width value, affected intermediate image size @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // obtain the resource image. You can change it to get a local image or take a photo to get the image logo = BitmapFactory. decodeResource (super. getResources (), R. drawable. y014); etCompany = (EditText) findViewById (R. id. etCompany); etPhone = (EditText) findViewById (R. id. etPhone); etEmail = (EditText) findViewById (R. id. etEmail); etWeb = (EditText) findViewById (R. id. etWeb); findViewById (R. id. but ). setOnClickListener (new OnClickListener () {@ Override public void onClick (View v) {// TODO Auto-generated method stub String company = etCompany. getText (). toString (). trim (); String phone = etPhone. getText (). toString (). trim (); String email = etEmail. getText (). toString (). trim (); String web = etWeb. getText (). toString (). trim (); // text information contained in the QR code String contents = "BEGIN: VCARD \ nVERSION: 3.0 \ nORG:" + company + "\ nTEL: "+ phone +" \ nURL: "+ web +" \ nEMAIL: "+ email +" \ nEND: VCARD "; try {// call the createCode method to generate the QR code Bitmap bm = createCode (contents, logo, BarcodeFormat. QR_CODE); ImageView img = (ImageView) findViewById (R. id. imgCode); // display the img on the QR code page. setImageBitmap (bm);} catch (WriterException e) {// TODO Auto-generated catch block e. printStackTrace ();}}});} /*** generate a QR code ** @ param string the text information contained in the QR code * @ param mBitmap logo image * @ param format encoding format * @ return Bitmap * @ throws WriterException */public bitmap createCode (String string, bitmap mBitmap, BarcodeFormat format) throws WriterException {Matrix m = new Matrix (); float sx = (float) 2 * IMAGE_HALFWIDTH/mBitmap. getWidth (); float sy = (float) 2 * IMAGE_HALFWIDTH/mBitmap. getHeight (); m. setScale (sx, sy); // set the scaling information // scale the logo image to the information set by martix mBitmap = Bitmap. createBitmap (mBitmap, 0, 0, mBitmap. getWidth (), mBitmap. getHeight (), m, false); MultiFormatWriter writer = new MultiFormatWriter (); Hashtable <EncodeHintType, String> hst = new Hashtable <EncodeHintType, String> (); hst. put (EncodeHintType. CHARACTER_SET, "UTF-8"); // sets the character encoding BitMatrix matrix = writer. encode (string, format, 400,400, hst); // generate a two-dimensional code matrix. int width = matrix. getWidth (); // matrix height int height = matrix. getHeight (); // matrix width int halfW = width/2; int halfH = height/2; int [] pixels = new int [width * height]; // define the length of the array as the height of the matrix * the width of the matrix, used to record the pixel information in the matrix for (int y = 0; y In addition, if you need to save the generated QR code to a disk, refer to the savebmptosd () method of bitmaputilin blog http://www.cnblogs.com/jerehedu/p/4461090.html
To learn more, clickView Source CodeIn person!
Author: Jerry Education
Source: http://www.cnblogs.com/jerehedu/
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