Guide to use the Android ExifInterface framework: graphic analysis and example demonstration
Guide to use the Android ExifInterface framework: graphic analysis and example demonstration
Overview:
In Android development, the EXIF (Exchangeable Image Format) information that processs images is a common task.EXIF information stores the metadata of the image, such as shooting time, geographical location, etc.Android provides an ExiFinterface framework that enables developers to read and write an EXIF information for images.This article will introduce the use guide for the ExiFinterface framework, and help readers better understand and apply this framework through graphic analysis and example demonstration.
1. Introduce ExiFinterface dependencies:
Add the following code to the project's build.gradle file:
gradle
dependencies {
implementation 'com.android.support:exifinterface:1.0.0'
}
2. Read the EXIF information of the image:
ExiFinterface provides a variety of methods to read the EXIF information of images.The following is an example code:
try {
ExifInterface exifInterface = new ExifInterface(filePath);
String dateTime = exifInterface.getAttribute(ExifInterface.TAG_DATETIME);
String location = exifInterface.getAttribute(ExifInterface.TAG_GPS_LOCATION);
// Process read the EXIF information
// ...
} catch (IOException e) {
e.printStackTrace();
}
The above code first created an ExiFinterface object, and then obtained the value of the specified ExiF tag (such as shooting time and geographical location) through the Getattribute () method of this object.Developers can choose which EXIF information reads according to their own needs and process the information read.
3. EXIF information of the image:
ExiFinterface provides multiple methods to write EXIF information of the image.The following is an example code:
try {
ExifInterface exifInterface = new ExifInterface(filePath);
exifInterface.setAttribute(ExifInterface.TAG_DATETIME, "2021-01-01 12:00:00");
exifinterface.setttribute (exifinterface.tag_gps_location, "latitudes: longitude: longitude");
// Save the modified EXIF information to the image file
exifInterface.saveAttributes();
} catch (IOException e) {
e.printStackTrace();
}
The above code first creates an ExiFinterface object, and then set the value of the specified exif tag through the settattribute () method of the object.Developers can choose which EXIF information is written according to their own needs.Finally, call the saveattributes () method to save the modified EXIF information into the image file.
Summarize:
This article introduces the usage guidelines for the Android ExifInterface framework, and demonstrates the EXIF information of how to read and write images through graphic analysis and example demonstration.Developers can selectively read and write different EXIF information according to their needs.EXIF information is very important for image processing and management. By mastering the use of the ExiFinterface framework, developers can better use and manage metadata of the image.
