我正在构建我正在使用位置的Android应用程序。我的位置在服务中实施。当用户登录时，如果他没有打开GPS，他会收到警告对话框。但是当我退出并再次登陆LoginActivity（我的LAUNCHER活动是MainActivity，而这个GPS的功能是在MainActivity中的onCreate方法）我的应用程序崩溃。 这是我的功能：
public void alertForEnablingGPS(){
LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);
if(!lm.isProviderEnabled(LocationManager.GPS_PROVIDER) ||
!lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
// Build the alertForEnablingGPS dialog
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Location Services Not Active");
builder.setMessage("Please enable Location Services and GPS");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
// Show location settings when the user acknowledges the alertForEnablingGPS dialog
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
}
});
Dialog alertDialog = builder.create();
alertDialog.setCanceledOnTouchOutside(false);
alertDialog.show();
}}
这是我的错误：
09-14 14:19:43.680 7188-7188/com.telnet.asp E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.Worker thread.
at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:114)
at android.os.Handler.handleCallback(Handler.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
at dalvik.system.NativeStart.main(Native Method)
Caused by: rx.exceptions.OnCompletedFailedException: Unable to add window -- token android.os.BinderProxy@42c55580 is not valid; is your activity running?
at rx.observers.SafeSubscriber.onCompleted(SafeSubscriber.java:90)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated(OperatorObserveOn.java:284)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:219)
at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:107)
at android.os.Handler.handleCallback(Handler.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy@42c55580 is not valid; is your activity running?
at android.view.ViewRootImpl.setView(ViewRootImpl.java)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java)
at android.app.Dialog.show(Dialog.java)
at com.telnet.asp.presentation.view.activities.MainActivity.alertForEnablingGPS(MainActivity.java:385)
at com.telnet.asp.presentation.view.activities.MainActivity.viewAccount(MainActivity.java:142)
at com.telnet.asp.presentation.presenter.AccountPresenter.showAccountInView(AccountPresenter.java:44)
at com.telnet.asp.presentation.presenter.AccountPresenter.access$000(AccountPresenter.java:15)
at com.telnet.asp.presentation.presenter.AccountPresenter$AccountSubscriber.onCompleted(AccountPresenter.java:66)
at rx.observers.SafeSubscriber.onCompleted(SafeSubscriber.java:84)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated(OperatorObserveOn.java:284)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:219)
at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:107)
at android.os.Handler.handleCallback(Handler.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
我该怎么做才能解决这个问题？ 提前谢谢。
编辑：当我使用Rushi的答案时，我得到了这个错误：
09-14 15:03:11.346 10896-10896/com.telnet.asp E/WindowManager: Activity com.telnet.asp.presentation.view.activities.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42defcf8 V.E..... R.....ID 0,0-720,351} that was originally added here
android.view.WindowLeaked: Activity com.telnet.asp.presentation.view.activities.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{42defcf8 V.E..... R.....ID 0,0-720,351} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java)
at android.app.Dialog.show(Dialog.java)
at com.telnet.asp.presentation.view.activities.MainActivity.alertForEnablingGPS(MainActivity.java:392)
at com.telnet.asp.presentation.view.activities.MainActivity.viewAccount(MainActivity.java:143)
at com.telnet.asp.presentation.presenter.AccountPresenter.showAccountInView(AccountPresenter.java:44)
at com.telnet.asp.presentation.presenter.AccountPresenter.access$000(AccountPresenter.java:15)
at com.telnet.asp.presentation.presenter.AccountPresenter$AccountSubscriber.onCompleted(AccountPresenter.java:66)
at rx.observers.SafeSubscriber.onCompleted(SafeSubscriber.java:84)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated(OperatorObserveOn.java:284)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:219)
at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:107)
at android.os.Handler.handleCallback(Handler.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：-1)
GPSTracker gps;
gps= new GPSTracker(this);
if (gps.canGetLocation()) {
gps= new GPSTracker(Activity.this);
latitude = gps.getLatitude();
longitude = gps.getLongitude();
}else{
gps.showSettingsAlert();
}
将此单独的类放在您想要使用的位置，初始化此类的对象，并在您的登录活动中编写此行代码。试试这个，让我知道。
DECLARE @tbl1 AS TABLE
(
ITEM_NBR VARCHAR(5),
GRP_NBR VARCHAR(5)
)
INSERT INTO @tbl1 VALUES('0001',221)
INSERT INTO @tbl1 VALUES('0002',221)
INSERT INTO @tbl1 VALUES('0003',221)
答案 1 :(得分：-1)
如果您从后台线程显示对话框并且您的活动已被销毁，您将收到此错误， 在这里找到如何处理来自backgroung线程的对话框，
http://dimitar.me/android-displaying-dialogs-from-background-threads/