@android 如何优雅的主动终止并等待线程的结束？
@java 中止正在运行的线程
@关于android关闭耗时线程是的问题

简单说, 线程自己监测 interrupted标志位, 外部线程调用thread.interrupt() 去试图中止此线程.

更新

java里, 没有很直接的方法, 可以安全的去中止运行中的进程. 必须让线程自己退出.

详细的说明见JCP 7.1 Task Cancellation, 简单的做点摘抄:

1). Interruption is usually the most sensible way to implement cancellation;
2). A good way to think about interruption is that it does not actually interrupt a running thread; it just requests that the thread interrupt itself at the next convenient opportunity. (These opportunities are called cancellation points.)
3). Object.wait(), Thread.sleep()等方法在得到interrupt请求后, 会抛出InterruptedException;
4). However, not all blocking methods or blocking mechanisms are responsive to interruption; if a thread is blocked performing synchronous socket I/O or waiting to
acquire an intrinsic lock, interruption has no effect other than setting the thread's interrupted status.

你的程序不可能每一步都去判断interrupted状态, 但是你可以定义自己的cancellation points, 在合适的时间(比如完成了某些子步骤)后去检查interrupted状态. 我记得在 unix pthread里也有类似的概念.