Detailed explanation of Android Support ExiFinterface in the Java Library: Use examples and case analysis using examples
Android support exifinterface is a Java class library that is used to read and write the EXIF (Exchangeable Image File Format) information.EXIF information is a metadata embedded in the image file, including manufacturers, shooting time, photography parameters, etc. of the shooting equipment.In Android development, we often need to read and process the EXIF information of the picture, and Android Support ExifInterface provides a convenient API to implement this feature.
It is very simple to use Android Support ExiFinterface. The following is an example of use:
import android.support.media.ExifInterface;
import java.io.IOException;
public class ExifExample {
public static void getExifInfo(String filePath) {
try {
ExifInterface exifInterface = new ExifInterface(filePath);
String make = exifInterface.getAttribute(ExifInterface.TAG_MAKE);
String model = exifInterface.getAttribute(ExifInterface.TAG_MODEL);
String datetime = exifInterface.getAttribute(ExifInterface.TAG_DATETIME);
System.out.println("Make: " + make);
System.out.println("Model: " + model);
System.out.println("DateTime: " + datetime);
} catch (IOException e) {
e.printStackTrace();
}
}
public static void setExifInfo(String filePath, String make, String model, String datetime) {
try {
ExifInterface exifInterface = new ExifInterface(filePath);
exifInterface.setAttribute(ExifInterface.TAG_MAKE, make);
exifInterface.setAttribute(ExifInterface.TAG_MODEL, model);
exifInterface.setAttribute(ExifInterface.TAG_DATETIME, datetime);
exifInterface.saveAttributes();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String filePath = "/path/to/image.jpg";
getExifInfo(filePath);
setExifInfo(filePath, "Canon", "EOS 5D", "2022:01:01 12:00:00");
}
}
In the above example, we define a `ExiFexample` class, which contains two static methods` Getexifinfo` and `setexifinfo`.The method of `Getexifinfo` is used to read EXIF information of the specified picture file, and output manufacturers, models and shooting time.`SETEXIFINFO` method is used to set EXIF information of specified picture files, including manufacturers, models and shooting time.
In the `Main` method, we call the previously defined method and pass the path of a picture file.First we read the EXIF information of the picture using the `Getexifinfo` method and print the output.Then, we set the EXIF information of the picture using the `setexifinfo` method and save it in the file.It should be noted that in the real Android application, these methods should be called in the right place to operate the EXIF information of the picture.
In the process of using Android Support ExiFinterface, we also need to make some configurations.First, we need to add corresponding dependencies to the project's Build.gradle file:
groovy
implementation 'com.android.support:exifinterface:${VERSION}'
Among them, `$ {version}` needs to be replaced with the corresponding version number.
In addition, we need to add the permissions of reading and writing SD cards in the application of the application's Androidmanifest.xml file:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
The above is a detailed introduction to the example of the use of Android Support ExiFinterface and related configuration.By using this type of library, we can easily read and write the EXIF information of the picture to better process and manage the content of the picture.
