Android中的二维码生成与扫描功能

/* 
* content：二维码内容 
* widthPix：二维码宽度 
* heightPix：二维码高度 
* logoBm：二维码中间的logo对应的Bitmap 
*/ 
public static Bitmap createQRCode(String content, int widthPix, int heightPix, Bitmap logoBm)

/** 
 * 创建、展示二维码并将bitmap保存在本地 
 */ 
 private void create() { 
 int width = DensityUtil.dip2px(this, 200); 
 Bitmap bitmap = EncodingUtils.createQRCode("http://www.baidu.com", 
  width, width, BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher)); 
 iv_zxing.setImageBitmap(bitmap); 
 saveBitmap(bitmap); 
 } 
 /** 
 * 将Bitmap保存在本地 
 * 
 * @param bitmap 
 */ 
 public void saveBitmap(Bitmap bitmap) { 
 // 首先保存图片 
 File appDir = new File(Environment.getExternalStorageDirectory(),"zxing_image"); 
 if (!appDir.exists()) { 
  appDir.mkdir(); 
 } 
 String fileName = "zxing_image" + ".jpg"; 
 File file = new File(appDir, fileName); 
 try { 
  FileOutputStream fos = new FileOutputStream(file); 
  bitmap.compress(CompressFormat.JPEG, 100, fos); 
  fos.flush(); 
  fos.close(); 
 } catch (Exception e) { 
  e.printStackTrace(); 
 } 
 // 把文件插入到系统图库 
 try { 
  MediaStore.Images.Media.insertImage(this.getContentResolver(),file.getAbsolutePath(), fileName, null); 
 } catch (FileNotFoundException e) { 
  e.printStackTrace(); 
 } 
 // 通知图库更新 
 sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, 
  Uri.parse("file://" + "/sdcard/namecard/"))); 
} 

 /** 
 * 打开二维码扫描 
 */ 
private void open() { 
 config(); 
 startActivityForResult(new Intent(MainActivity.this,CaptureActivity.class), 0); 
} 
/** 
 * 提高屏幕亮度 
 */ 
private void config() { 
 WindowManager.LayoutParams lp = getWindow().getAttributes(); 
 lp.screenBrightness = 1.0f; 
 getWindow().setAttributes(lp); 
} 
@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
 super.onActivityResult(requestCode, resultCode, data); 
 if (resultCode == RESULT_OK) { 
 Bundle bundle = data.getExtras(); 
 String result = bundle.getString("result"); 
 tv_result.setText(result); 
 } 

/** 
* 打开本地图片 
*/ 
private void openLocalImage() { 
 // 打开手机中的相册 
 Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT); 
 innerIntent.setType("image/*"); 
 Intent wrapperIntent = Intent.createChooser(innerIntent, "选择二维码图片"); 
 this.startActivityForResult(wrapperIntent, 0x01); 
} 

@Override 
 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
 super.onActivityResult(requestCode, resultCode, data); 
 if (resultCode == RESULT_OK) { 
  switch (requestCode) { 
  case 0x01: 
  // 获取选中图片的路径 
  Cursor cursor = getContentResolver().query(data.getData(),null, null, null, null); 
  if (cursor.moveToFirst()) { 
   photo_path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); 
  } 
  cursor.close(); 
  new Thread(new Runnable() { 
   @Override 
   public void run() { 
   Result result = scanningImage(photo_path); 
   if (result != null) { 
    handleDecode(result, new Bundle()); 
   } 
   } 
  }).start(); 
  break; 
  } 
 } 
} 

/** 
 * A valid barcode has been found, so give an indication of success and show 
 * the results. 
 * 
 * @param rawResult 
 *  The contents of the barcode. 
 * @param bundle 
 *  The extras 
 */ 
 public void handleDecode(Result rawResult, Bundle bundle) { 
 inactivityTimer.onActivity(); 
 beepManager.playBeepSoundAndVibrate(); 
 Intent resultIntent = new Intent(); 
 bundle.putInt("width", mCropRect.width()); 
 bundle.putInt("height", mCropRect.height()); 
 bundle.putString("result", rawResult.getText()); 
 resultIntent.putExtras(bundle); 
 this.setResult(RESULT_OK, resultIntent); 
 CaptureActivity.this.finish(); 
}

/** 
 * 扫描二维码图片的方法 
 * 
 * @param path 
 * @return 
 */ 
 public Result scanningImage(String path) { 
 if (TextUtils.isEmpty(path)) { 
  return null; 
 } 
 Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>(); 
 hints.put(DecodeHintType.CHARACTER_SET, "UTF8"); // 设置二维码内容的编码 
 BitmapFactory.Options options = new BitmapFactory.Options(); 
 options.inJustDecodeBounds = true; // 先获取原大小 
 scanBitmap = BitmapFactory.decodeFile(path, options); 
 options.inJustDecodeBounds = false; // 获取新的大小 
 int sampleSize = (int) (options.outHeight / (float) 200); 
 if (sampleSize <= 0) 
  sampleSize = 1; 
 options.inSampleSize = sampleSize; 
 scanBitmap = BitmapFactory.decodeFile(path, options); 
 int width = scanBitmap.getWidth(); 
 int height = scanBitmap.getHeight(); 
 int[] pixels = new int[width * height]; 
 scanBitmap.getPixels(pixels, 0, width, 0, 0, width, height); 
 /** 
 * 第三个参数是图片的像素 
 */ 
 RGBLuminanceSource source = new RGBLuminanceSource(width, height, 
  pixels); 
 BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source)); 
 QRCodeReader reader = new QRCodeReader(); 
 try { 
  return reader.decode(bitmap1, hints); 
 } catch (NotFoundException e) { 
  e.printStackTrace(); 
 } catch (ChecksumException e) { 
  e.printStackTrace(); 
 } catch (FormatException e) { 
  e.printStackTrace(); 
 } 
 return null; 
 } 

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> 
<uses-permission android:name="android.permission.CAMERA"/> 
<uses-permission android:name="android.permission.VIBRATE"/> 
<activity android:name="com.example.zxingtest.zxing.activity.CaptureActivity"/>