Invalid use of SingleClientConnManager: connection still allocated

08-12 12:49:18.463: W/SingleClientConnManager(1155): Invalid use of SingleClientConnManager: connection still allocated.
08-12 12:49:18.463: W/SingleClientConnManager(1155): Make sure to release the connection before allocating another one.
08-12 12:49:18.467: I/—info(1155): Exception Message—Adapter is detached.
08-12 12:49:18.467: W/System.err(1155): java.lang.IllegalStateException: Adapter is detached.
08-12 12:49:18.471: W/System.err(1155): at org.apache.http.impl.conn.AbstractPooledConnAdapter.assertAttached(AbstractPooledConnAdapter.java:90)
08-12 12:49:18.471: W/System.err(1155): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:118)
08-12 12:49:18.471: W/System.err(1155): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
08-12 12:49:18.471: W/System.err(1155): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
08-12 12:49:18.471: W/System.err(1155): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
08-12 12:49:18.471: W/System.err(1155): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
08-12 12:49:18.471: W/System.err(1155): utils.HttpUtils.postRequest(HttpUtils.java:126)
08-12 12:49:18.471: W/System.err(1155): utils.HttpUtils.postRequest(HttpUtils.java:63)
08-12 12:49:18.471: W/System.err(1155): at android.os.AsyncTask2.call(AsyncTask.java:287)08−1212:49:18.471:W/System.err(1155):atjava.util.concurrent.FutureTaskSync.innerRun(FutureTask.java:305)
08-12 12:49:18.471: W/System.err(1155): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-12 12:49:18.471: W/System.err(1155): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-12 12:49:18.471: W/System.err(1155): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-12 12:49:18.471: W/System.err(1155): at java.lang.Thread.run(Thread.java:856)

原因分析
代码中有一个使用HttpClinet的工具类被多次使用，但只有在一个特定操作下才会出现错误，发现在只有进行此操作时需要接连两次使用此工具类。

出现错误的工具类部分代码：
// HttpClient实例private static final HttpClient httpClient = new DefaultHttpClient();// 多次使用的工具类public static synchronized String postRequest(Activity _ctx, String url, Map<String, String> rawParams, String jsonStr) {    //    //    //}
连续两次使用同一个HttpClient对象执行了联网操作，根据提示，可以判断问题出在第一次连接未释放而连接第二次已经开始造成此错误。

解决办法

对症下药：给方法添加线程锁

public static synchronized String postRequest(Activity _ctx, String url, Map<String, String> rawParams, String jsonStr) {    //    //    //}
总结

出现此错误的其他解决方案：
1.有可能是连接未释放：
post.bort();
2.销毁返回输入流获得的实体:
HttpClient4.x.x :
EntityUtils.consume(entity);
HttpClient3.x.x :
mHttpEntity.consumeContent();

参考：http://www.th7.cn/Program/Android/201508/531410.shtml