在android中停止异步任务线程

Question

我正在扩展 AsynTask 以更新屏幕上的图像。图像从输入流通过套接字不断更新。 当我按下后退按钮时，我已经从异步任务 doinbackground() 中出来了。从 doinbackground() 出来后，我将关闭输入流和套接字。

我得到以下异常的地方

08-09 20:19:24.410: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
08-09 20:19:24.420: W/System.err(32597):    at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:448)
08-09 20:19:24.420: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
08-09 20:19:24.420: W/System.err(32597):    at com.einstructions.interwriteworkspace.WorkSpaceActivity$GetImageStreamFromServer.doInBackground(WorkSpaceActivity.java:618)
08-09 20:19:24.430: W/System.err(32597):    at android.os.AsyncTask$2.call(AsyncTask.java:252)
08-09 20:19:24.450: W/System.err(32597):    at java.lang.Thread.run(Thread.java:1020)
08-09 20:19:24.450: W/System.err(32597):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-09 20:19:24.470: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.480: W/System.err(32597):    at com.einstructions.interwriteworkspace.WorkSpaceActivity$GetImageStreamFromServer.doInBackground(WorkSpaceActivity.java:1)
08-09 20:19:24.480: W/System.err(32597):    at org.apache.harmony.luni.platform.OSNetworkSystem.read(Native Method)
08-09 20:19:24.480: W/System.err(32597):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-09 20:19:24.490: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
08-09 20:19:24.490: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.490: W/System.err(32597):    at com.einstructions.interwriteworkspace.WorkSpaceActivity$GetImageStreamFromServer.doInBackground(WorkSpaceActivity.java:618)
08-09 20:19:24.500: W/System.err(32597):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-09 20:19:24.500: W/System.err(32597):    at org.apache.harmony.luni.platform.OSNetworkSystem.read(Native Method)
08-09 20:19:24.500: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.500: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:574)
08-09 20:19:24.510: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.510: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.510: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.520: W/System.err(32597):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1081)
08-09 20:19:24.520: W/System.err(32597):    at org.apache.harmony.luni.net.PlainSocketImpl.read(PlainSocketImpl.java:448)
08-09 20:19:24.520: W/System.err(32597):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)

请帮帮我

问候 小型的。

Answer 1

您必须在暂停/停止 Activity 时取消 GetImageStreamFromServer 任务。 在 onPause/onStop 里面使用，

getImageStreamFromServerTask.cancel(true);