StrictMode下method 'close' not called

[ITRocker]

E/StrictMode: A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
java.lang.Throwable: Explicit termination method 'close' not called
at dalvik.system.CloseGuard.open(CloseGuard.java:223)
at java.io.RandomAccessFile.(RandomAccessFile.java:282)
at com.yanzhenjie.kalle.download.BasicWorker.call(BasicWorker.java:121)
at com.yanzhenjie.kalle.download.BasicWorker.call(BasicWorker.java:40)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at com.yanzhenjie.kalle.download.Work.run(Work.java:41)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)