geo tagging in android | 易学教程

问题

How to know whether the geo tagging is enabled or disabled in android camera setting through the code? We are attaching the geo tags to photos through code. We using Location Manager,Location Listener to get the latitude and longitude and save this coordinates to photo using Exif interface.

ExifInterface exif = new ExifInterface(/sdcard/photo/photoname.jpg);
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE,String.valueOf(latitudeValueInDecimal));
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE,String.valueOf(longitudeValueInDecimal));
exif.setAttribute(ExifInterface.TAG_GPS_LATITUDE_REF,"N");
exif.setAttribute(ExifInterface.TAG_GPS_LONGITUDE_REF,"W");
exif.saveAttributes();

We have to add gps coordinates(latitude and longitude) to photo only when the geotag is enabled in camera setting? so how to check the status of geo tag(store location) in camera settings? I am using HTC wildfire S phone?

回答1:

You can't check this programatically. You'll have to read the tags of the pictures taken and check the GPS-coordinates manually, if the tags are empty then geo-tagging is disabled.

You can use the ExifInterface class to read the EXIF metadata from JPEG images. Here's the official docs link explaining this:

http://developer.android.com/reference/android/media/ExifInterface.html

Here's sample code you can use to read the tags:

Bundle bundle = getIntent().getExtras();

if (null != bundle) {
    String filepath = bundle.getString(FILE_PATH_KEY);

    try {
        ExifInterface exif = new ExifInterface(filepath);
        StringBuilder builder = new StringBuilder();

        builder.append("Date & Time: " + getExifTag(exif, ExifInterface.TAG_DATETIME) + "\n\n");
        builder.append("Flash: " + getExifTag(exif, ExifInterface.TAG_FLASH) + "\n");
        builder.append("Focal Length: " + getExifTag(exif, ExifInterface.TAG_FOCAL_LENGTH) + "\n\n");
        builder.append("GPS Datestamp: " + getExifTag(exif, ExifInterface.TAG_FLASH) + "\n");
        builder.append("GPS Latitude: " + getExifTag(exif, ExifInterface.TAG_GPS_LATITUDE) + "\n");
        builder.append("GPS Latitude Ref: " + getExifTag(exif, ExifInterface.TAG_GPS_LATITUDE_REF) + "\n");
        builder.append("GPS Longitude: " + getExifTag(exif, ExifInterface.TAG_GPS_LONGITUDE) + "\n");
        builder.append("GPS Longitude Ref: " + getExifTag(exif, ExifInterface.TAG_GPS_LONGITUDE_REF) + "\n");
        builder.append("GPS Processing Method: " + getExifTag(exif, ExifInterface.TAG_GPS_PROCESSING_METHOD) + "\n");
        builder.append("GPS Timestamp: " + getExifTag(exif, ExifInterface.TAG_GPS_TIMESTAMP) + "\n\n");
        builder.append("Image Length: " + getExifTag(exif, ExifInterface.TAG_IMAGE_LENGTH) + "\n");
        builder.append("Image Width: " + getExifTag(exif, ExifInterface.TAG_IMAGE_WIDTH) + "\n\n");
        builder.append("Camera Make: " + getExifTag(exif, ExifInterface.TAG_MAKE) + "\n");
        builder.append("Camera Model: " + getExifTag(exif, ExifInterface.TAG_MODEL) + "\n");
        builder.append("Camera Orientation: " + getExifTag(exif, ExifInterface.TAG_ORIENTATION) + "\n");
        builder.append("Camera White Balance: " + getExifTag(exif, ExifInterface.TAG_WHITE_BALANCE) + "\n");

        builder = null;
    } catch (IOException e) {
        e.printStackTrace();
    }
}

来源：https://stackoverflow.com/questions/12740503/geo-tagging-in-android

标签

android

gps

geotagging