Android Zxing生成二维码经典案例分享

@H_675_11@ public class QRCode { private static int IMAGE_HALFWIDTH = 50;//宽度值，影响中间图片大小 /** * 生成二维码，默认大小为500*500 * * @return bitmap */ public static Bitmap createQRCode() { return createQRCode(); } /** * 生成二维码，默认大小为500*500 * * @param text 需要生成二维码的文字、网址等 * @return bitmap */ public static Bitmap createQRCode(String text) { return createQRCode(text,500); } /** * 生成二维码 * * @param text 需要生成二维码的文字、网址等 * @param size 需要生成二维码的大小（） * @return bitmap */ public static Bitmap createQRCode(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,hints); int[] pixels = new int[size * size]; for (int y = 0; y < size; y++) { for (int x = 0; x < size; x++) { if (bitMatrix.get(x,y)) { pixels[y * size + x] = 0xff000000; } else { pixels[y * size + x] = 0xffffffff; } } } Bitmap bitmap = Bitmap.createBitmap(size,Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels,sizE); return bitmap; } catch (WriterException E) { e.printStackTrace(); return null; } } /** * 生成带logo的二维码，默认二维码的大小为500，logo为二维码的1/5 * * @param text 需要生成二维码的文字、网址等 * @param mBitmap logo文件 * @return bitmap */ public static Bitmap createQRCodeWithlogo(String text,Bitmap mBitmap) { return createQRCodeWithlogo(text,500,mBitmap); } /** * 生成带logo的二维码，logo默认为二维码的1/5 * * @param text 需要生成二维码的文字、网址等 * @param size 需要生成二维码的大小（） * @param mBitmap logo文件 * @return bitmap */ public static Bitmap createQRCodeWithlogo(String text,int size,Bitmap mBitmap) { try { IMAGE_HALFWIDTH = size/10; Hashtable<EncodeHintType,Object> hints = new Hashtable<>(); hints.put(EncodeHintType.CHARACTER_SET,"utf-8"); /* * 设置容错级别，默认为ErrorCorrectionLevel.L * 因为中间加入logo所以建议你把容错级别调至H,否则可能会出现识别不了 */ hints.put(EncodeHintType.ERROR_CORRECTION,ErrorCorrectionLevel.H); BitMatrix bitMatrix = new QRCodeWriter().encode(text,hints); int width = bitMatrix.getWidth();//矩阵高度 int height = bitMatrix.getHeight();//矩阵宽度 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); //设置缩放信息 //将logo图片按martix设置的信息缩放 mBitmap = Bitmap.createBitmap(mBitmap,mBitmap.getWidth(),mBitmap.getHeight(),m,falsE); int[] pixels = new int[size * size]; for (int y = 0; y < size; y++) { for (int x = 0; x < size; x++) { if (x > halfW - IMAGE_HALFWIDTH && x < halfW + IMAGE_HALFWIDTH && y > halfH - IMAGE_HALFWIDTH && y < halfH + IMAGE_HALFWIDTH) { //该位置用于存放图片信息 //记录图片每个像素信息 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); return bitmap; } catch (WriterException E) { e.printStackTrace(); return null; } }

@H_675_11@ 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();//创建矩阵 getWindowManager().getDefaultDisplay().getMetrics(dm); imageview = (ImageView) findViewById(R.id.imageview); bp= BitmapFactory.decoderesource(getresources(),R.drawable.icon); netfits = QRCode.createQRCodeWithlogo("张",200,bp); int width = netfits.getWidth(); int height = netfits.getHeight(); int w = dm.widthPixels; //得到屏幕的宽度 final int h = dm.heightPixels; //得到屏幕的高度 scaleWidth = ((float) w) / width; scaleHeight = ((float) w) / height; imageview.setImageBitmap(netfits); imageview.setOnClickListener(new View.onClickListener() { @Override public void onClick(View view) { if (num == truE) { Matrix matrix = new Matrix(); matrix.postScale(scaleWidth,scaleHeight); Bitmap newBitmap = Bitmap.createBitmap(netfits,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,truE); imageview.setImageBitmap(newBitmap); num = true; } } }); }

@H_675_11@ @Override public Boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: //当屏幕检测到第一个触点按下之后就会触发到这个事件。 if (num == truE) { Matrix matrix = new Matrix(); matrix.postScale(scaleWidth,truE); imageview.setImageBitmap(newBitmap); num = true; } break; } return super.onTouchEvent(event); }

@H_675_11@ 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(),500); imageView.setImageBitmap(bitmap); } } }); }