我的程序是在一个后台的线程里进行网络活动。在开始之前，它弹出一个进度对话框。这个对话框是处理器上被驳回的。除了当对话框出现的时候屏幕的方向发生变换（后台线程也跟随着发生变化），其他的都是正常的。在时，应用或者崩溃，有时候死锁，或者是当所有的线程都被杀死的时候进入到应用，否则一点都不起作用这样一个怪异的阶段。
我能怎样处理屏幕方向发生变化这个问题？
下面的示例代码大概就是我的真正的程序：
public class MyAct extends Activity implements Runnable {
public ProgressDialog mProgress;
// UI has a button that when pressed calls send
public void send() {
mProgress = ProgressDialog.show(this, "Please wait",
"Please wait",
true, true);
Thread thread = new Thread(this);
thread.start();
}
public void run() {
Thread.sleep(10000);
Message msg = new Message();
mHandler.sendMessage(msg);
}
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
mProgress.dismiss();
}
};
}
栈：
E/WindowManager( 244): Activity MyAct has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@433b7150 that was originally added here
E/WindowManager( 244): android.view.WindowLeaked: Activity MyAct has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@433b7150 that was originally added here
E/WindowManager( 244): at android.view.ViewRoot.<init>(ViewRoot.java:178)
E/WindowManager( 244): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:147)
E/WindowManager( 244): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:90)
E/WindowManager( 244): at android.view.Window$LocalWindowManager.addView(Window.java:393)
E/WindowManager( 244): at android.app.Dialog.show(Dialog.java:212)
E/WindowManager( 244): at android.app.ProgressDialog.show(ProgressDialog.java:103)
E/WindowManager( 244): at android.app.ProgressDialog.show(ProgressDialog.java:91)
E/WindowManager( 244): at MyAct.send(MyAct.java:294)
E/WindowManager( 244): at MyAct$4.onClick(MyAct.java:174)
E/WindowManager( 244): at android.view.View.performClick(View.java:2129)
E/WindowManager( 244): at android.view.View.onTouchEvent(View.java:3543)
E/WindowManager( 244): at android.widget.TextView.onTouchEvent(TextView.java:4664)
E/WindowManager( 244): at android.view.View.dispatchTouchEvent(View.java:3198)
E/WindowManager( 244): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:857)
E/WindowManager( 244): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:857)
E/WindowManager( 244): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:857)
E/WindowManager( 244): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:857)
E/WindowManager( 244): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:857)
E/WindowManager( 244): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1593)
E/WindowManager( 244): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1089)
E/WindowManager( 244): at android.app.Activity.dispatchTouchEvent(Activity.java:1871)
E/WindowManager( 244): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1577)
E/WindowManager( 244): at android.view.ViewRoot.handleMessage(ViewRoot.java:1140)
E/WindowManager( 244): at android.os.Handler.dispatchMessage(Handler.java:88)
E/WindowManager( 244): at android.os.Looper.loop(Looper.java:123)
E/WindowManager( 244): at android.app.ActivityThread.main(ActivityThread.java:3739)
E/WindowManager( 244): at java.lang.reflect.Method.invokeNative(Native Method)
E/WindowManager( 244): at java.lang.reflect.Method.invoke(Method.java:515)
E/WindowManager( 244): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
E/WindowManager( 244): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
E/WindowManager( 244): at dalvik.system.NativeStart.main(Native Method)
和：
W/dalvikvm( 244): threadid=3: thread exiting with uncaught exception (group=0x4000fe68)
E/AndroidRuntime( 244): Uncaught handler: thread main exiting due to uncaught exception
E/AndroidRuntime( 244): java.lang.IllegalArgumentException: View not attached to window manager
E/AndroidRuntime( 244): at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:331)
E/AndroidRuntime( 244): at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:200)
E/AndroidRuntime( 244): at android.view.Window$LocalWindowManager.removeView(Window.java:401)
E/AndroidRuntime( 244): at android.app.Dialog.dismissDialog(Dialog.java:249)
E/AndroidRuntime( 244): at android.app.Dialog.access$000(Dialog.java:59)
E/AndroidRuntime( 244): at android.app.Dialog$1.run(Dialog.java:93)
E/AndroidRuntime( 244): at android.app.Dialog.dismiss(Dialog.java:233)
E/AndroidRuntime( 244): at MyAct$1.handleMessage(MyAct.java:321)
E/AndroidRuntime( 244): at android.os.Handler.dispatchMessage(Handler.java:88)
E/AndroidRuntime( 244): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 244): at android.app.ActivityThread.main(ActivityThread.java:3739)
E/AndroidRuntime( 244): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 244): at java.lang.reflect.Method.invoke(Method.java:515)
E/AndroidRuntime( 244): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
E/AndroidRuntime( 244): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
E/AndroidRuntime( 244): at dalvik.system.NativeStart.main(Native Method)
I/Process ( 46): Sending signal. PID: 244 SIG: 3
I/dalvikvm( 244): threadid=7: reacting to signal 3
I/dalvikvm( 244): Wrote stack trace to '/data/anr/traces.txt'
I/Process ( 244): Sending signal. PID: 244 SIG: 9
I/ActivityManager( 46): Process MyAct (pid 244) has died.
我试图在onSaveInstanceState上取消对话框的进度条，但是这只能防止立即崩溃。后台线程仍然在运行，而且这个用户界面有一部分是处于拉伸状态的。需要杀掉整个应用程序才会重新开始工作。
