Android 网络超时 app闪退？

近的一个项目中需要用HttpClient频繁请求远程服务器，开发过程中遇到如下问题导致app闪退，设置请求超时时间或捕捉超时异常都无法阻止app闪退。为什么？

11-23 20:41:18.930: E/System(27238): org.apache.http.impl.conn.SingleClientConnManager.finalize() timed out after 10000 ms; limit is 10000 ms
11-23 20:41:18.950: E/System(27238): java.util.concurrent.TimeoutException
11-23 20:41:18.950: E/System(27238): 	at libcore.io.Posix.close(Native Method)
11-23 20:41:18.950: E/System(27238): 	at libcore.io.BlockGuardOs.close(BlockGuardOs.java:75)
11-23 20:41:18.950: E/System(27238): 	at libcore.io.IoBridge.closeSocket(IoBridge.java:188)
11-23 20:41:18.950: E/System(27238): 	at java.net.PlainSocketImpl.close(PlainSocketImpl.java:162)
11-23 20:41:18.950: E/System(27238): 	at java.net.Socket.close(Socket.java:316)
11-23 20:41:18.950: E/System(27238): 	at org.apache.http.impl.SocketHttpClientConnection.shutdown(SocketHttpClientConnection.java:183)
11-23 20:41:18.950: E/System(27238): 	at org.apache.http.impl.conn.DefaultClientConnection.shutdown(DefaultClientConnection.java:150)
11-23 20:41:18.950: E/System(27238): 	at org.apache.http.impl.conn.SingleClientConnManager$PoolEntry.shutdown(SingleClientConnManager.java:440)
11-23 20:41:18.950: E/System(27238): 	at org.apache.http.impl.conn.SingleClientConnManager.shutdown(SingleClientConnManager.java:376)
11-23 20:41:18.950: E/System(27238): 	at org.apache.http.impl.conn.SingleClientConnManager.finalize(SingleClientConnManager.java:135)
11-23 20:41:18.950: E/System(27238): 	at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:186)
11-23 20:41:18.950: E/System(27238): 	at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:169)
11-23 20:41:18.950: E/System(27238): 	at java.lang.Thread.run(Thread.java:856)

呼呼……经过两天的研究发现，是由于HttpClient接口调用频繁，请求结束但未关闭连接/资源，导致tcp 网络阻塞，所以app出现了很多ConnectTimeoutException，android系统发现某app十秒内没有响应，就认为它已经变成僵尸进程，直接把它干掉了，所以会导致app闪退。