代码中动态控制U盘挂载和卸载。（仅适用于系统应用）

反射方式实现。

需要添加android:sharedUserId="android.uid.system" 到AndroidManifest.xml

  public static void mountDisk() {Log.v(TAG, "mountDisk begin");try {Class<?> clz = Class.forName("android.os.ServiceManager");Method getService = clz.getMethod("getService", String.class);Object powerService = getService.invoke(null, "mount");Class<?> cStub = Class.forName("android.os.storage.IStorageManager$Stub");Method asInterface = cStub.getMethod("asInterface", IBinder.class);Object IPowerManager = asInterface.invoke(null, powerService);Method shutDown = IPowerManager.getClass().getMethod("mount", String.class);shutDown.invoke(IPowerManager, "public:8,1");} catch (Exception e) {e.printStackTrace();}Log.v(TAG, "mountDisk end");}public static void unmountDisk() {Log.v(TAG, "unmountDisk begin");try {Class<?> clz = Class.forName("android.os.ServiceManager");Method getService = clz.getMethod("getService", String.class);Object powerService = getService.invoke(null, "mount");Class<?> cStub = Class.forName("android.os.storage.IStorageManager$Stub");Method asInterface = cStub.getMethod("asInterface", IBinder.class);Object IPowerManager = asInterface.invoke(null, powerService);Method shutDown = IPowerManager.getClass().getMethod("unmount", String.class);shutDown.invoke(IPowerManager, "public:8,1");} catch (Exception e) {e.printStackTrace();}Log.v(TAG, "unmountDisk end");}public static boolean isUsbDiskMounted() {String mount = SystemPropertiesUtil.getProperty("vold.usbdisk.state", "");return "mounted".equals(mount);}