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Android二维码之创建
1.Android 有自带的jar包可以生成二维码core-3.0.0.jar，其中的com.google.zxing包
2.写一个二维码生成的工具类，网上搜的话应该一大堆。
1 package com.example.administrator.twocodedemo; 2 3 import android.content.Context; 4 import android.graphics.Bitmap; 5 import android.graphics.Bitmap.Config; 6 import android.graphics.Canvas; 7 import android.graphics.Color; 8 import android.graphics.PointF; 9 import android.view.Gravity; 10 import android.view.View.MeasureSpec; 11 import android.widget.LinearLayout; 12 import android.widget.LinearLayout.LayoutParams; 13 import android.widget.TextView; 14 15 import com.google.zxing.BarcodeFormat; 16 import com.google.zxing.EncodeHintType; 17 import com.google.zxing.MultiFormatWriter; 18 import com.google.zxing.WriterException; 19 import com.google.zxing.common.BitMatrix; 20 import com.google.zxing.qrcode.QRCodeWriter; 21 22 import java.util.Hashtable; 23 24 /** 25 * 26 * 生成条形码和二维码的工具 27 */ 28 public class ZXingUtils { 29 /** 30 * 生成二维码 要转换的地址或字符串,可以是中文 31 * 32 * @param url 33 * @param width 34 * @param height 35 * @return 36 */ 37 public static Bitmap createQRImage(String url, final int width, final int height) { 38 try { 39 // 判断URL合法性 40 if (url == null || "".equals(url) || url.length() < 1) { 41 return null; 42 } 43 Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); 44 hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 45 // 图像数据转换，使用了矩阵转换 46 BitMatrix bitMatrix = new QRCodeWriter().encode(url, 47 BarcodeFormat.QR_CODE, width, height, hints); 48 int[] pixels = new int[width * height]; 49 // 下面这里按照二维码的算法，逐个生成二维码的图片， 50 // 两个for循环是图片横列扫描的结果 51 for (int y = 0; y < height; y++) { 52 for (int x = 0; x < width; x++) { 53 if (bitMatrix.get(x, y)) { 54 pixels[y * width + x] = 0xff000000; 55 } else { 56 pixels[y * width + x] = 0xffffffff; 57 } 58 } 59 } 60 // 生成二维码图片的格式，使用ARGB_8888 61 Bitmap bitmap = Bitmap.createBitmap(width, height, 62 Bitmap.Config.ARGB_8888); 63 bitmap.setPixels(pixels, 0, width, 0, 0, width, height); 64 return bitmap; 65 } catch (WriterException e) { 66 e.printStackTrace(); 67 } 68 return null; 69 } 70 71 /** 72 * 生成条形码 73 * 74 * @param context 75 * @param contents 76 * 需要生成的内容 77 * @param desiredWidth 78 * 生成条形码的宽带 79 * @param desiredHeight 80 * 生成条形码的高度 81 * @param displayCode 82 * 是否在条形码下方显示内容 83 * @return 84 */ 85 public static Bitmap creatBarcode(Context context, String contents, 86 int desiredWidth, int desiredHeight, boolean displayCode) { 87 Bitmap ruseltBitmap = null; 88 /** 89 * 图片两端所保留的空白的宽度 90 */ 91 int marginW = 20; 92 /** 93 * 条形码的编码类型 94 */ 95 BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128; 96 97 if (displayCode) { 98 Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat, 99 desiredWidth, desiredHeight); 100 Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2 101 * marginW, desiredHeight, context); 102 ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF( 103 0, desiredHeight)); 104 } else { 105 ruseltBitmap = encodeAsBitmap(contents, barcodeFormat, 106 desiredWidth, desiredHeight); 107 } 108 109 return ruseltBitmap; 110 } 111 112 /** 113 * 生成条形码的Bitmap 114 * 115 * @param contents 116 * 需要生成的内容 117 * @param format 118 * 编码格式 119 * @param desiredWidth 120 * @param desiredHeight 121 * @return 122 * @throws WriterException 123 */ 124 protected static Bitmap encodeAsBitmap(String contents, 125 BarcodeFormat format, int desiredWidth, int desiredHeight) { 126 final int WHITE = 0xFFFFFFFF; 127 final int BLACK = 0xFF000000; 128 129 MultiFormatWriter writer = new MultiFormatWriter(); 130 BitMatrix result = null; 131 try { 132 result = writer.encode(contents, format, desiredWidth, 133 desiredHeight, null); 134 } catch (WriterException e) { 135 // TODO Auto-generated catch block 136 e.printStackTrace(); 137 } 138 139 int width = result.getWidth(); 140 int height = result.getHeight(); 141 int[] pixels = new int[width * height]; 142 // All are 0, or black, by default 143 for (int y = 0; y < height; y++) { 144 int offset = y * width; 145 for (int x = 0; x < width; x++) { 146 pixels[offset + x] = result.get(x, y) ? BLACK : WHITE; 147 } 148 } 149 150 Bitmap bitmap = Bitmap.createBitmap(width, height, 151 Bitmap.Config.ARGB_8888); 152 bitmap.setPixels(pixels, 0, width, 0, 0, width, height); 153 return bitmap; 154 } 155 156 /** 157 * 生成显示编码的Bitmap 158 * 159 * @param contents 160 * @param width 161 * @param height 162 * @param context 163 * @return 164 */ 165 protected static Bitmap creatCodeBitmap(String contents, int width, 166 int height, Context context) { 167 TextView tv = new TextView(context); 168 LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams( 169 LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 170 tv.setLayoutParams(layoutParams); 171 tv.setText(contents); 172 tv.setHeight(height); 173 tv.setGravity(Gravity.CENTER_HORIZONTAL); 174 tv.setWidth(width); 175 tv.setDrawingCacheEnabled(true); 176 tv.setTextColor(Color.BLACK); 177 tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 178 MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); 179 tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight()); 180 181 tv.buildDrawingCache(); 182 Bitmap bitmapCode = tv.getDrawingCache(); 183 return bitmapCode; 184 } 185 186 /** 187 * 将两个Bitmap合并成一个 188 * 189 * @param first 190 * @param second 191 * @param fromPoint 192 * 第二个Bitmap开始绘制的起始位置（相对于第一个Bitmap） 193 * @return 194 */ 195 protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second, 196 PointF fromPoint) { 197 if (first == null || second == null || fromPoint == null) { 198 return null; 199 } 200 int marginW = 20; 201 Bitmap newBitmap = Bitmap.createBitmap( 202 first.getWidth() + second.getWidth() + marginW, 203 first.getHeight() + second.getHeight(), Config.ARGB_4444); 204 Canvas cv = new Canvas(newBitmap); 205 cv.drawBitmap(first, marginW, 0, null); 206 cv.drawBitmap(second, fromPoint.x, fromPoint.y, null); 207 cv.save(Canvas.ALL_SAVE_FLAG); 208 cv.restore(); 209 210 return newBitmap; 211 } 212 213 }
3.MainActivity
@OnClick({R.id.btn_create, R.id.iv_two_code})
public void onClick(View view) {
switch (view.getId()) {
case R.id.btn_create:
String url = etUrl.getText().toString().trim();
Bitmap bitmap = ZXingUtils.createQRImage(url, ivTwoCode.getWidth(), ivTwoCode.getHeight());
ivTwoCode.setImageBitmap(bitmap);
例如:
String company=etCompany.getText().toString().trim() ;
String phone =etPhone .getText().toString().trim() ;
String email = etEmail.getText().toString().trim() ;
String web = etWeb.getText().toString().trim() ;
//二维码中包含的文本信息
String contents= "BEGIN:VCARD\nVERSION:3.0\nORG:"+company+"\nTEL:"+phone+"\nURL:"+web+"\nEMAIL:"+email+"\nEND:VCARD";
try {
//调用方法createCode生成二维码
Bitmap bm=createCode(contents, logo, BarcodeFormat.QR_CODE);
Android二维码之创建
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