我想在Service类的Timer中显示AlertDialog,我使用以下代码：

timer.scheduleAtFixedRate( new TimerTask()

{

private Handler updateUI = new Handler()

{

public void dispatchMessage(android.os.Message msg)

{

super.dispatchMessage(msg);

try {

fun();

} catch (Exception e) {e.printStackTrace(); }

}

};

public void run()

{

try {

updateUI.sendEmptyMessage(0);

}catch (Exception e) {e.printStackTrace(); }

}

},60000);

public void fun()

{

AlertDialog.Builder dlgAlert = new AlertDialog.Builder(this);

dlgAlert.setMessage("");

dlgAlert.setTitle("");

dlgAlert.setPositiveButton("OK",null);

dlgAlert.setCancelable(true);

dlgAlert.create();

dlgAlert.show();

}

我收到以下错误：

03-14 13:14:36.879: WARN/WindowManager(60): Attempted to add window with non-application token WindowToken{43f606b0 token=null}. Aborting.

03-14 13:14:36.879: WARN/System.err(817): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application

03-14 13:14:36.889: WARN/System.err(817): at android.view.ViewRoot.setView(ViewRoot.java:509)

03-14 13:14:36.889: WARN/System.err(817): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)

03-14 13:14:36.889: WARN/System.err(817): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)

03-14 13:14:36.899: WARN/System.err(817): at android.app.Dialog.show(Dialog.java:241)

03-14 13:14:36.899: WARN/System.err(817): at android.app.AlertDialog$Builder.show(AlertDialog.java:802)

03-14 13:14:36.899: WARN/System.err(817): at com.mobilelocalite.pkg.GPSServiceCellId.comparefromDb(GPSServiceCellId.java:373)

03-14 13:14:36.909: WARN/System.err(817): at com.mobilelocalite.pkg.GPSServiceCellId$1$1.dispatchMessage(GPSServiceCellId.java:133)

03-14 13:14:36.909: WARN/System.err(817): at android.os.Looper.loop(Looper.java:123)

03-14 13:14:36.909: WARN/System.err(817): at android.app.ActivityThread.main(ActivityThread.java:4627)

03-14 13:14:36.909: WARN/System.err(817): at java.lang.reflect.Method.invokeNative(Native Method)

03-14 13:14:36.909: WARN/System.err(817): at java.lang.reflect.Method.invoke(Method.java:521)

03-14 13:14:36.909: WARN/System.err(817): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)

03-14 13:14:36.920: WARN/System.err(817): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)

03-14 13:14:36.920: WARN/System.err(817): at dalvik.system.NativeStart.main(Native Method)

提前致谢.