Android如何从图片获取二维码

 case CHOOSE_PIC:          String[] proj = new String[]{MediaStore.Images.Media.DATA};          Cursor cursor = QRCodeActivity.this.getContentResolver().query(data.getData(), proj, null, null, null);          if(cursor.moveToFirst()){            int columnIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);            System.out.println(columnIndex);            //获取到用户选择的二维码图片的绝对路径            imgPath = cursor.getString(columnIndex);          }          cursor.close();          //获取解析结果          Result ret = parseQRcodeBitmap(imgPath);          if (ret==null){            Toast.makeText(QRCodeActivity.this,getString(R.string.load_two_dimensional_error), Toast.LENGTH_LONG).show();          }else {//            Toast.makeText(QRCodeActivity.this,"解析结果：" + ret.toString(), Toast.LENGTH_LONG).show();            Intent intent = new Intent();            intent.putExtra(Intents.Scan.RESULT, ret.toString());            this.setResult(Activity.RESULT_OK, intent);            this.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);            finish();          }          break;