Android zxing Two-dimensional Code classic case sharing _android

The example of this article for us to analyze the zxing generation of two-dimensional code of the classic case for your reference, the specific contents are as follows

1, first of all, compile compile ' com.google.zxing:core:3.2.1 '

2. actual combat

public class QRCode {private static int image_halfwidth = 50;//width value, affect middle picture size/** * Generate two-dimensional code, the default size is 500*500 * * @return bit

Map */public static Bitmap Createqrcode () {return Createqrcode ();} /** * Generates two-dimensional code, the default size is 500*500 * * @param text needs to generate two-dimensional code text, URL, etc. * @return Bitmap/public static bitmap Createqrcode (String

Text) {return Createqrcode (text, 500);} /** * Generate Two-dimensional code * * @param text needs to generate two-dimensional code text, URL, etc. * @param size needs to generate a two-dimensional code () * @return Bitmap/public static bitmap creat
  Eqrcode (String text, int size) {try {hashtable<encodehinttype, string> hints = new hashtable<> ();
  Hints.put (Encodehinttype.character_set, "utf-8");
  Bitmatrix Bitmatrix = new Qrcodewriter (). Encode (text, barcodeformat.qr_code, size, size, hints);
  int[] pixels = new int[size * size]; for (int y = 0; y < size; y++) {for (int x = 0; x < size; x +) {if (Bitmatrix.get (y)) {Pixels[y *
    Size + x] = 0xff000000;
    else {pixels[y * size + x] = 0xFFFFFFFF;

}   } Bitmap Bitmap = bitmap.createbitmap (size, size, Bitmap.Config.ARGB_8888);
  Bitmap.setpixels (pixels, 0, size, 0, 0, size, size);
 return bitmap;
  catch (Writerexception e) {e.printstacktrace ();
 return null; }/** * Generates a two-dimensional code with a logo, the default two-dimensional code size of 500,logo for two-dimensional code 1/5 * * @param text needs to generate two-dimensional code text, URL, etc. * @param mbitmap logo file * @return bit Map */public static Bitmap Createqrcodewithlogo (String text, Bitmap mbitmap) {return Createqrcodewithlogo (Text,500,mbi
TMAP); 
 /** * Generate a two-dimensional code with a logo, the logo defaults to two-dimensional code 1/5 * * @param text needs to generate two-dimensional code text, URL, etc. * @param size needs to generate two-dimensional code sizes () * @param mbitmap logo file * @return Bitmap */public static bitmap Createqrcodewithlogo (String text, int size, bitmap mbitmap) {try {Image_h
  Alfwidth = SIZE/10;
  Hashtable<encodehinttype, object> hints = new hashtable<> ();
  Hints.put (Encodehinttype.character_set, "utf-8"); * * Set the Fault tolerance level, the default is ERRORCORRECTIONLEVEL.L * because the middle of the logo so we recommend that you adjust the fault-tolerant level to H, otherwise it may appear not recognized * * HINTS.PUT (encodehinttype.error_c ORREction, ErrorCorrectionLevel.H);

  Bitmatrix Bitmatrix = new Qrcodewriter (). Encode (text, barcodeformat.qr_code, size, size, hints);
  int width = bitmatrix.getwidth ();//matrix height int height = bitmatrix.getheight ();//matrix width int HALFW = WIDTH/2;

  int halfh = HEIGHT/2;
  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 zoom information//Set the logo picture by Martix information to scale Mbitmap = Bitmap.createbitmap (mbitmap, 0, 0, mbitmap.getwidth (), Mbitmap.getheigh

  T (), M, false);
  int[] pixels = new int[size * size]; for (int y = 0; y < size, y++) {for (int x = 0; x < size; x +) {if (× > Halfw-image_halfwidth &&am P X < HALFW + image_halfwidth && y > Halfh-image_halfwidth && y < HALFH + IMAGE_HALFW Idth) {//This location is used for storing picture information//recording pictures per pixel information pixels[y * width + x] = Mbitmap.getpixel (X-HALFW + image_Halfwidth, Y-HALFH + image_halfwidth);
     else {if (Bitmatrix.get (x, y)) {pixels[y * size + x] = 0xff000000;
     else {pixels[y * size + x] = 0xFFFFFFFF;
  }}} Bitmap Bitmap = bitmap.createbitmap (size, size, Bitmap.Config.ARGB_8888);
  Bitmap.setpixels (pixels, 0, size, 0, 0, size, size);
 return bitmap;
  catch (Writerexception e) {e.printstacktrace ();
 return null;

 }
}

3, analysis

Generate two-dimensional code, the above can do the operation generated with text and URLs, with pictures and two-dimensional code size, in the code have a detailed summary.

4, the two-dimensional code to enlarge and reduce the operation

public class Mainactivity extends Appcompatactivity {Bitmap bp = null;
 ImageView ImageView;
 float ScaleWidth;

 float ScaleHeight;
 int h;
 Boolean num = false;

Private Bitmap netfits;
 @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);


 Setcontentview (R.layout.activity_main);

 Displaymetrics dm = new Displaymetrics ()///Create Matrix Getwindowmanager (). Getdefaultdisplay (). Getmetrics (DM);
 ImageView = (ImageView) Findviewbyid (R.id.imageview);


 bp= Bitmapfactory.decoderesource (Getresources (), R.drawable.icon);

 Netfits = Qrcode.createqrcodewithlogo ("Zhang", 200,bp);
 int width = netfits.getwidth ();
 int height = netfits.getheight (); int w = dm.widthpixels; Get the width of the screen final int h = dm.heightpixels;
 Get the height of the screen ScaleWidth = ((float) w)/width;
 ScaleHeight = ((float) w)/height;

 Imageview.setimagebitmap (netfits); Imageview.setonclicklistener (New View.onclicklistener () {@Override public void OnClick (view view) {if (num = = Tru
E) {    Matrix matrix = new Matrix ();

    Matrix.postscale (ScaleWidth, ScaleHeight);
    Bitmap Newbitmap = Bitmap.createbitmap (netfits, 0, 0, netfits.getwidth (), Netfits.getheight (), Matrix, True);
    Imageview.setimagebitmap (NEWBITMAP);
   num = false;
    else {Matrix matrix = new Matrix ();
    Matrix.postscale (1.0f, 1.0f);
    Bitmap Newbitmap = Bitmap.createbitmap (netfits, 0, 0, netfits.getwidth (), Netfits.getheight (), Matrix, True);
    Imageview.setimagebitmap (NEWBITMAP);
   num = true;
}
  }
 });

 }

In normal mode we can handle it ourselves:

@Override Public
Boolean ontouchevent (Motionevent event) {

 switch (event.getaction ()) {

  case Motionevent.action_down://When the screen detects that the first contact is pressed, the event is triggered.
   if (num = = true) {
    matrix matrix = new Matrix ();
    Matrix.postscale (ScaleWidth, scaleheight);

    Bitmap Newbitmap = Bitmap.createbitmap (netfits, 0, 0, netfits.getwidth (), Netfits.getheight (), Matrix, true);
    Imageview.setimagebitmap (NEWBITMAP);
    num = false;
   } else {
    Matrix matrix = new Matrix ();
    Matrix.postscale (1.0f, 1.0f);
    Bitmap Newbitmap = Bitmap.createbitmap (netfits, 0, 0, netfits.getwidth (), Netfits.getheight (), Matrix, true);
    Imageview.setimagebitmap (NEWBITMAP);
    num = true;
   }
   break;


 Return Super.ontouchevent (event);
}

Add feature: See if selected, add picture to two-dimensional code

private void Initview () {
 edittext = (edittext) This.findviewbyid (r.id.qrcode_et);
 Button = (button) This.findviewbyid (R.ID.QRCODE_BT);
 ImageView = (ImageView) This.findviewbyid (R.ID.QRCODE_IV);
 CB = (CheckBox) This.findviewbyid (R.ID.QRCODE_CB);

 Button.setonclicklistener (New View.onclicklistener () {
  @Override public
  void OnClick (view view) {
   if ( Cb.ischecked ()) {
    Bitmap Bitmap = Qrcode.createqrcodewithlogo (Edittext.gettext (). toString (),
      Bitmapfactory.decoderesource (Getresources (), R.drawable.logo_me));
    Imageview.setimagebitmap (bitmap);
   } else{
    Bitmap Bitmap = Qrcode.createqrcode (Edittext.gettext (). toString ();
    Imageview.setimagebitmap (bitmap);}}
 );

Above is a simple implementation of two-dimensional code and narrowing the method, if better implementation, welcome to communicate!

The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.