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<EncodeHintType, Object> 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<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();   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);  } }