Android QR code generation

The latest in learning adnroid, encountered two-dimensional code generation and scanning here to do a collation

The tool class of the QR code generation

　　

/**

* QR code generation tool Class

*/

public class Qrcodeutil {

　/**

* Generate QR Code address or string to be converted, can be in Chinese

* @param URL

* @param width

* @param height

* @return

*/

public static Bitmap createqrimage (String URL, final int width, final int height) {

try {

Determine URL legitimacy

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");

Conversion of image data using matrix conversion

Bitmatrix Bitmatrix = new Qrcodewriter (). Encode (URL,

Barcodeformat.qr_code, width, height, hints);

int[] pixels = new int[width * height];

Here according to the two-dimensional code algorithm, one by one to generate two-dimensional code of the picture,

Two for loop is the result of the picture Heng Lie scan

for (int y = 0; y < height; y++) {

for (int x = 0; x < width; + +) {

if (Bitmatrix.get (x, y)) {

Pixels[y * width + x] = 0xff000000;

} else {

Pixels[y * width + x] = 0xFFFFFFFF;

}

}

}

Create a QR code image format, using argb_8888

Bitmap Bitmap = Bitmap.createbitmap (width, height,config.argb_8888);

Bitmap.setpixels (pixels, 0, width, 0, 0, width, height);

return bitmap;

} catch (Writerexception e) {

E.printstacktrace ();

}

return null;

}

/**

* Barcode Generation

*

* @param context

* @param contents

* Content that needs to be generated

* @param desiredwidth

* Broadband for barcode generation

* @param desiredheight

* The height of the barcode is generated

* @param displaycode

* Whether the content is displayed below the barcode

* @return

*/

public static Bitmap Creatbarcode (context context, String contents,int desiredwidth, int desiredheight, Boolean Displayco DE) {

Bitmap ruseltbitmap = null;

/**

* Blank width reserved at both ends of the picture

*/

int marginw = 20;

/**

* Barcode Encoding Type

*/

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;

}

/**

* Bitmap to generate barcodes

*

* @param contents

* Content that needs to be generated

* @param format

* Encoding Format

* @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) {

E.printstacktrace ();

}

int width = result.getwidth ();

int height = result.getheight ();

int[] pixels = new int[width * height];

for (int y = 0; y < height; y++) {

int offset = y * width;

for (int x = 0; x < width; + +) {

Pixels[offset + x] = Result.get (x, y)? Black:white;

}

}

Bitmap Bitmap = Bitmap.createbitmap (width, height,config.argb_8888);

Bitmap.setpixels (pixels, 0, width, 0, 0, width, height);

return bitmap;

}

/**

* Generate display encoding for 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);

Layoutparams layoutparams = new 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;

}

/**

* Merge two bitmap into one

*

* @param First

* @param second

* @param frompoint

* The start position of the second bitmap start drawing (relative to the first 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;

}

}

　　

　　

You can use it directly in the activity.

First parameter to generate a string of two-dimensional code

Bitmap Qrbitmap = qrcodeutil.createqrimage ("Revolve", 400, 400);

IV indicates the ID of ImageView in XML

Iv.setimagebitmap (qrbitmap);

　　

Android QR code generation