android - 将元数据添加到 Android 中创建的位图中

Question

我正在使用相机 Intent 拍照，然后将该图像转换为字节数组并最终将其保存在本地数据库中。用相机拍摄的原始图像具有所有元数据，如 GPS 纬度和经度等。但是，我从该图像创建的位图不包含任何元数据。如何将原始元数据添加到我的图像中？

这是我的相机 Intent 返回的代码:

picUri = data.getData()    
Bitmap yourSelectedImage62 = null;
                String imagebytes2 ;
                try
                {
                    yourSelectedImage62 = MediaStore.Images.Media.getBitmap(this.getContentResolver(), picUri);
                    yourSelectedImage62 = Bitmap.createScaledBitmap(yourSelectedImage62, large_width, large_height, true);
                } catch (FileNotFoundException ex)
                {
                    Logger.getLogger(Screen_View_Submission.class.getName()).log(Level.SEVERE, null, ex);
                } catch (IOException ex) {
                    Logger.getLogger(Screen_New_Submission.class.getName()).log(Level.SEVERE, null, ex);
                }

                ByteArrayOutputStream bao62 = new ByteArrayOutputStream();
                yourSelectedImage62.compress(Bitmap.CompressFormat.JPEG, 75, bao62);
                byte[] ba62 = bao62.toByteArray();
                imagebytes2 = Base64.encodeToString(ba62,Base64.DEFAULT);
                yourSelectedImage62.recycle();

Answer 1

元数据不是位图的属性。它存储为 JPEG 文件的 Exinf。使用 ExifInterface此处更新元数据是设置 gps 坐标的示例

exif = new ExifInterface(imageFile.getAbsolutePath());
        int num1Lat = (int) Math.floor(latitude);
        int num2Lat = (int) Math.floor((latitude - num1Lat) * 60);
        double num3Lat = (latitude - ((double) num1Lat + ((double) num2Lat / 60))) * 3600000;

        int num1Lon = (int) Math.floor(longitude);
        int num2Lon = (int) Math.floor((longitude - num1Lon) * 60);
        double num3Lon = (longitude - ((double) num1Lon + ((double) num2Lon / 60))) * 3600000;

        exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE, num1Lat + "/1," + num2Lat + "/1," + num3Lat + "/1000");
        exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE, num1Lon + "/1," + num2Lon + "/1," + num3Lon + "/1000");

        if (latitude > 0) {
            exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, "N");
        } else {
            exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF, "S");
        }

        if (longitude > 0) {
            exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, "E");
        } else {
            exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF, "W");
        }
        exif.setAttribute(ExifInterface.TAG_MAKE, "FooBarr");
        exif.setAttribute(ExifInterface.TAG_MODEL, "KooKKoo");
        exif.setAttribute(ExifInterface.TAG_ORIENTATION,orientation+"");
        exif.saveAttributes();