CardReaderProvider-Bluetooth-Feitian-Android
· The CardReaderProvider-Bluetooth-Feitian-Android library provides functionality to use the Bluetooth Feitian devices on Android devices.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window cardreader.provider.bluetooth.feitian-1.1.4.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.