首先来看一下报错日志：
05-05 10:36:41.009: E/WindowManager(4243): Activity com.tao.MyActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405241b0 that was originally added here 05-05 10:36:41.009: E/WindowManager(4243): android.view.WindowLeaked: Activity com.tao.MyActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405241b0 that was originally added here 05-05 10:36:41.009: E/WindowManager(4243): at android.view.ViewRoot.<init>(ViewRoot.java:265) 05-05 10:36:41.009: E/WindowManager(4243): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148) 05-05 10:36:41.009: E/WindowManager(4243): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) 05-05 10:36:41.009: E/WindowManager(4243): at android.view.Window$LocalWindowManager.addView(Window.java:424) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.Dialog.show(Dialog.java:241) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ProgressDialog.show(ProgressDialog.java:107) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ProgressDialog.show(ProgressDialog.java:95) 05-05 10:36:41.009: E/WindowManager(4243): at com.unifable.activity.MySecretaryActivity.onCreate(MySecretaryActivity.java:50) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.access00(ActivityThread.java:117) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 05-05 10:36:41.009: E/WindowManager(4243): at android.os.Handler.dispatchMessage(Handler.java:99) 05-05 10:36:41.009: E/WindowManager(4243): at android.os.Looper.loop(Looper.java:130) 05-05 10:36:41.009: E/WindowManager(4243): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-05 10:36:41.009: E/WindowManager(4243): at java.lang.reflect.Method.invokeNative(Native Method) 05-05 10:36:41.009: E/WindowManager(4243): at java.lang.reflect.Method.invoke(Method.java:507) 05-05 10:36:41.009: E/WindowManager(4243): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:906) 05-05 10:36:41.009: E/WindowManager(4243): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:664) 05-05 10:36:41.009: E/WindowManager(4243): at dalvik.system.NativeStart.main(Native Method) 这是在做一个项目的时候遇到的问题：在第一界面的Activity中，为了避免程序网络慢时，带来的糟糕的用户体验，所以采用异步任务AsyncTask来访问网络，与服务器进行交互，并用 ProgressDialog控件来告知用户当前的程序进度，05-05 10:36:41.009: E/WindowMa
