package com.tejia.lijin.app.util.zxing.encode;
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import android.graphics.Bitmap;
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import android.graphics.Matrix;
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import android.text.TextUtils;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.EncodeHintType;
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import com.google.zxing.MultiFormatWriter;
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import com.google.zxing.WriterException;
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import com.google.zxing.common.BitMatrix;
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import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
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import java.util.Hashtable;
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public class CodeCreator {
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/*生成二维码*/
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public static Bitmap createQRCode(String content, int w, int h,Bitmap logo) throws WriterException {
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if (TextUtils.isEmpty(content)) {
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return null;
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}
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/*偏移量*/
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int offsetX = w / 2;
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int offsetY = h / 2;
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/*生成logo*/
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Bitmap logoBitmap=null;
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if (logo!=null){
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Matrix matrix = new Matrix();
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float scaleFactor = Math.min(w * 1.0f / 5 / logo.getWidth(), h * 1.0f / 5 /logo.getHeight());
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matrix.postScale(scaleFactor,scaleFactor);
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logoBitmap= Bitmap.createBitmap(logo, 0, 0, logo.getWidth(), logo.getHeight(), matrix, true);
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}
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/*如果log不为null,重新计算偏移量*/
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int logoW = 0;
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int logoH = 0;
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if (logoBitmap != null) {
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logoW = logoBitmap.getWidth();
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logoH = logoBitmap.getHeight();
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offsetX = (w - logoW) / 2;
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offsetY = (h - logoH) / 2;
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}
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/*指定为UTF-8*/
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Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
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//容错级别
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hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
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//设置空白边距的宽度
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hints.put(EncodeHintType.MARGIN, 0);
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// 生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败
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BitMatrix matrix = new MultiFormatWriter().encode(content,
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BarcodeFormat.QR_CODE, w, h, hints);
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// 二维矩阵转为一维像素数组,也就是一直横着排了
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int[] pixels = new int[w * h];
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for (int y = 0; y < h; y++) {
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for (int x = 0; x < w; x++) {
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if(x >= offsetX && x < offsetX + logoW && y>= offsetY && y < offsetY + logoH){
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int pixel = logoBitmap.getPixel(x-offsetX,y-offsetY);
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if(pixel == 0){
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if(matrix.get(x, y)){
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pixel = 0xff000000;
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}else{
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pixel = 0xffffffff;
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}
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}
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pixels[y * w + x] = pixel;
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}else{
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if (matrix.get(x, y)) {
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pixels[y * w + x] = 0xff000000;
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} else {
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pixels[y * w + x] = 0xffffffff;
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}
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}
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}
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}
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Bitmap bitmap = Bitmap.createBitmap(w, h,
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Bitmap.Config.ARGB_8888);
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bitmap.setPixels(pixels, 0, w, 0, 0, w, h);
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return bitmap;
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}
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}
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