项目中添加设备操作需要扫描二维码,考虑到多种扫码方式,也添加直接识别二维码图片的操作。
首先跳转系统相册选取图片
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI); startActivityForResult(intent, DEVICE_PHOTO_REQUEST);
接着将选取的图片展示到界面
1 @Override 2 public void onActivityResult(int requestCode, int resultCode, Intent data) { 3 //用户没有进行有效的设置操作,返回 4 if (requestCode == Activity.RESULT_CANCELED ){ 5 ToastUtil.showToast(AddDeviceActivity.this, R.string.cancel); 6 return; 7 } 8 if (DEVICE_PHOTO_REQUEST == requestCode){ 9 if (null != data) { 10 Uri selectedImage = data.getData(); 11 String[] filePathColumns = {MediaStore.Images.Media.DATA}; 12 String imagePath; 13 Cursor c = this.getContentResolver().query(selectedImage, filePathColumns, null, null, null); 14 if (c != null) { 15 c.moveToFirst(); 16 int columnIndex = c.getColumnIndex(filePathColumns[0]); 17 imagePath = c.getString(columnIndex); 18 c.close(); 19 20 Bitmap bm = BitmapFactory.decodeFile(imgPath); 21 img_code.setImageBitmap(bm); 22 } else { 23 ToastUtil.showToast(this, "图片路径为空"); 24 } 25 } 26 } 27 super.onActivityResult(requestCode, resultCode, data); 28 } 29
然后用第三包的方法解码识别(需要导入\'cn.bingoogolapple:bga-zxing:1.1.9@aar\'),注意自己处理一下匿名 AsyncTask 内部类导致的Activity 泄漏问题
img_code.setDrawingCacheEnabled(true); final Bitmap bmp = img_code.getDrawingCache(); new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... params) { return QRCodeDecoder.syncDecodeQRCode(bmp); } @Override protected void onPostExecute(String result) { if (TextUtils.isEmpty(result)) { Toast.makeText(AddDeviceActivity.this, "二维码解析失败", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(AddDeviceActivity.this, result, Toast.LENGTH_SHORT).show(); } } }.execute();