使用FileSystemRegistry监听移动存储卡的操作

 

 

点击Midlet　→　External events →　File Connection → Mount → 输入sodinoN78，则插入一个手机存储卡。手机屏幕提示有新卡插入。

 

 

package lab.sodino.filesys;import javax.microedition.io.file.FileSystemListener;import javax.microedition.io.file.FileSystemRegistry;import javax.microedition.lcdui.Alert;import javax.microedition.lcdui.AlertType;import javax.microedition.lcdui.Display;import javax.microedition.lcdui.Form;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;public class FSListenerDemo extends MIDlet implements FileSystemListener {public FSListenerDemo() {super();Form f = new Form("FSDemo");Display.getDisplay(this).setCurrent(f);}protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {}protected void pauseApp() {}protected void startApp() throws MIDletStateChangeException {FileSystemRegistry.addFileSystemListener(this);}public void rootChanged(int state, String rootName) {if (state == FileSystemListener.ROOT_ADDED) {Alert alert = new Alert("Information", "A new card has been mounted, it's name is " + rootName, null,AlertType.CONFIRMATION);alert.setTimeout(Alert.FOREVER);Display.getDisplay(this).setCurrent(alert);} else if (state == FileSystemListener.ROOT_REMOVED) {Alert alert = new Alert("Information", "A new card has been unmounted, it's name is " + rootName, null,AlertType.CONFIRMATION);alert.setTimeout(Alert.FOREVER);Display.getDisplay(this).setCurrent(alert);}}}