Android二维码创建实例

Android二维码之创建

实现效果图：

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。

实例代码：

package com.example.administrator.twocodedemo;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PointF;
import android.view.Gravity;
import android.view.View.MeasureSpec;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;


public class ZXingUtils {
  
  public static Bitmap createQRImage(String url, final int width, final int height) {
    try {
      // 判断URL合法性
      if (url == null || "".equals(url) || url.length() < 1) {
 return null;
      }
      Hashtable hints = new Hashtable();
      hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
      // 图像数据转换，使用了矩阵转换
      BitMatrix bitMatrix = new QRCodeWriter().encode(url,
   BarcodeFormat.QR_CODE, width, height, hints);
      int[] pixels = new int[width * height];
      // 下面这里按照二维码的算法，逐个生成二维码的图片，
      // 两个for循环是图片横列扫描的结果
      for (int y = 0; y < height; y++) {
 for (int x = 0; x < width; x++) {
   if (bitMatrix.get(x, y)) {
     pixels[y * width + x] = 0xff000000;
   } else {
     pixels[y * width + x] = 0xffffffff;
   }
 }
      }
      // 生成二维码图片的格式，使用ARGB_8888
      Bitmap bitmap = Bitmap.createBitmap(width, height,
   Bitmap.Config.ARGB_8888);
      bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
      return bitmap;
    } catch (WriterException e) {
      e.printStackTrace();
    }
    return null;
  }

  
  public static Bitmap creatBarcode(Context context, String contents,
     int desiredWidth, int desiredHeight, boolean displayCode) {
    Bitmap ruseltBitmap = null;
    
    int marginW = 20;
    
    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;
  }

  
  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) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    int width = result.getWidth();
    int height = result.getHeight();
    int[] pixels = new int[width * height];
    // All are 0, or black, by default
    for (int y = 0; y < height; y++) {
      int offset = y * width;
      for (int x = 0; x < width; x++) {
 pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
      }
    }

    Bitmap bitmap = Bitmap.createBitmap(width, height,
 Bitmap.Config.ARGB_8888);
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    return bitmap;
  }

  
  protected static Bitmap creatCodeBitmap(String contents, int width,
 int height, Context context) {
    TextView tv = new TextView(context);
    LinearLayout.LayoutParams layoutParams = new LinearLayout.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;
  }

  
  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;
  }

}
ZXingUtils

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:VCARDnVERSION:3.0nORG:"+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);
    

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