Android中二维码的生成方法(普通二维码、中心Logo二维码、及扫描解析二维码)

package com.chinasie.barcodescanplugin; 
import android.graphics.Bitmap; 
import android.graphics.Canvas; 
import com.google.zxing.BarcodeFormat; 
import com.google.zxing.EncodeHintType; 
import com.google.zxing.WriterException; 
import com.google.zxing.common.BitMatrix; 
import com.google.zxing.qrcode.QRCodeWriter; 
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.util.HashMap; 
import java.util.Hashtable; 
import java.util.Map; 
/** 
 * Created by HanWeijia on 2017/2/4. 
 */ 
public class QRCodeUtil { 
 private static int QR_WIDTH = 300; 
 private static int QR_HEIGHT = 300; 
 /** 
 * 生成二维码Bitmap 
 * 
 * @param content 内容 
 * @param widthPix 图片宽度 
 * @param heightPix 图片高度 
 * @param logoBm 二维码中心的Logo图标（可以为null） 
 * @param filePath 用于存储二维码图片的文件路径 
 * @return 生成二维码及保存文件是否成功 
 */ 
 public static Bitmap createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) { 
 try { 
  if (content == null || "".equals(content)) { 
  return null; 
  } 
  //配置参数 
  Map hints = new HashMap<>(); 
  hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
  //容错级别 
  hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); 
  //设置空白边距的宽度 
  //  hints.put(EncodeHintType.MARGIN, 2); //default is 4 
  // 图像数据转换，使用了矩阵转换 
  BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints); 
  int[] pixels = new int[widthPix * heightPix]; 
  // 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 < heightPix; y++) { 
  for (int x = 0; x < widthPix; x++) { 
   if (bitMatrix.get(x, y)) { 
   pixels[y * widthPix + x] = 0xff000000; 
   } else { 
   pixels[y * widthPix + x] = 0xffffffff; 
   } 
  } 
  } 
  // 生成二维码图片的格式，使用ARGB_8888 
  Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888); 
  bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix); 
  if (logoBm != null) { 
  bitmap = addLogo(bitmap, logoBm); 
  } 
  //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的，内存消耗巨大！ 
  return bitmap;//!= null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath)); 
 } catch (WriterException e) { 
  e.printStackTrace(); 
 } 
 return null; 
 } 
 /** 
 * 在二维码中间添加Logo图案 
 */ 
 private static Bitmap addLogo(Bitmap src, Bitmap logo) { 
 if (src == null) { 
  return null; 
 } 
 if (logo == null) { 
  return src; 
 } 
 //获取图片的宽高 
 int srcWidth = src.getWidth(); 
 int srcHeight = src.getHeight(); 
 int logoWidth = logo.getWidth(); 
 int logoHeight = logo.getHeight(); 
 if (srcWidth == 0 || srcHeight == 0) { 
  return null; 
 } 
 if (logoWidth == 0 || logoHeight == 0) { 
  return src; 
 } 
 //logo大小为二维码整体大小的1/5 
 float scaleFactor = srcWidth * 1.0f / 5 / logoWidth; 
 Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888); 
 try { 
  Canvas canvas = new Canvas(bitmap); 
  canvas.drawBitmap(src, 0, 0, null); 
  canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2); 
  canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null); 
  canvas.save(Canvas.ALL_SAVE_FLAG); 
  canvas.restore(); 
 } catch (Exception e) { 
  bitmap = null; 
  e.getStackTrace(); 
 } 
 return bitmap; 
 } 
 /** 
 * 生成普通的二维码 
 * 要转换的地址或字符串,可以是中文 
 * @param url 
 */ 
 public static Bitmap createQRImage(String url) 
 { 
 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, QR_WIDTH, QR_HEIGHT, hints); 
  int[] pixels = new int[QR_WIDTH * QR_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 < QR_HEIGHT; y++) 
  { 
  for (int x = 0; x < QR_WIDTH; x++) 
  { 
   if (bitMatrix.get(x, y)) 
   { 
   pixels[y * QR_WIDTH + x] = 0xff000000; 
   } 
   else 
   { 
   pixels[y * QR_WIDTH + x] = 0xffffffff; 
   } 
  } 
  } 
  //生成二维码图片的格式，使用ARGB_8888 
  Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT, Bitmap.Config.ARGB_8888); 
  bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT); 
  return bitmap; 
 } 
 catch (WriterException e) 
 { 
  e.printStackTrace(); 
 } 
 return null; 
 } 
}

package com.chinasie.barcodescanplugin; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ImageView; 
import com.zxing.activity.CaptureActivity; 
import java.io.File; 
public class MainActivity extends AppCompatActivity implements View.OnClickListener { 
 private static String TAB = MainActivity.class.getSimpleName(); 
 //显示扫描结果 
 private EditText editText = null; 
 //扫描按钮 
 private Button btnScan = null; 
 //普通图片 
 private ImageView imageNormal = null; 
 //普通按钮 
 private Button buttonNormal = null; 
 //特按钮 
 private Button buttonAndCenter = null; 
 //有中心图片 
 private ImageView imageWithCenter = null; 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 initView(); 
 } 
 /** 
 * 点击时间响应 
 * @param v 
 */ 
 @Override 
 public void onClick(View v) { 
 switch (v.getId()){ 
  case R.id.btnScan: 
  try { 
   //打开扫描界面扫描条形码或二维码 
   Intent openCameraIntent = new Intent(MainActivity.this, CaptureActivity.class); 
   startActivityForResult(openCameraIntent, 0); 
  } 
  catch (Exception ex){ 
   Log.e(TAB,ex.getMessage()); 
   ex.printStackTrace(); 
  } 
  break; 
  case R.id.button: 
  //普通的二维码图片显示到一个ImageView上面 
  imageNormal.setImageBitmap(QRCodeUtil.createQRImage("123456789")); 
  break; 
  case R.id.buttonAndCenter: 
  final String filePath = File.separator 
   + "qr_" + System.currentTimeMillis() + ".jpg"; 
  //二维码图片较大时，生成图片、保存文件的时间可能较长，因此放在新线程中 
  new Thread(new Runnable() { 
   @Override 
   public void run() { 
   final Bitmap success = QRCodeUtil.createQRImage("strUrl", 800,800,BitmapFactory.decodeResource(getResources(), R.drawable.gg),filePath); 
   if (success!=null) { 
    runOnUiThread(new Runnable() { 
    @Override 
    public void run() { 
     //带有中心图片的二维码显示在 imageWithCenter 上 
     imageWithCenter.setImageBitmap(success); 
    } 
    }); 
   } 
   } 
  }).start(); 
  break; 
 } 
 } 
 @Override 
 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
 super.onActivityResult(requestCode, resultCode, data); 
 //处理扫描结果（在界面上显示） 
 if (resultCode == RESULT_OK) { 
  Bundle bundle = data.getExtras(); 
  String scanResult = bundle.getString("result"); 
  editText.setText(scanResult); 
 } 
 } 
 /** 
 * 初始化View 
 */ 
 private void initView(){ 
 editText = (EditText)this.findViewById(R.id.editText); 
 imageWithCenter = (ImageView)findViewById(R.id.imageAndCenter); 
 imageNormal = (ImageView)this.findViewById(R.id.image) ; 
 btnScan = (Button)this.findViewById(R.id.btnScan); 
 buttonNormal = (Button)this.findViewById(R.id.button); 
 buttonAndCenter = (Button)findViewById(R.id.buttonAndCenter); 
 btnScan.setOnClickListener(this); 
 buttonNormal.setOnClickListener(this); 
 buttonAndCenter.setOnClickListener(this); 
 } 
}