Unite Login & Download AsyncTasks into a Fragment

[kinverarity1]

I really need to unite the two AsyncTasks (e.g. ImportTask in dev-Book branch) and use a proper DialogFragment to avoid these problems, which I'll bet are from people going to other apps or rotating the screen.

java.lang.IllegalArgumentException: View not attached to window manager
at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355)
at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:200)
at android.view.Window$LocalWindowManager.removeView(Window.java:432)
at android.app.Dialog.dismissDialog(Dialog.java:278)
at android.app.Dialog.access$000(Dialog.java:71)
at android.app.Dialog$1.run(Dialog.java:111)
at android.app.Dialog.dismiss(Dialog.java:268)
at com.nietky.librarythingbrowser.BookListActivity$LTLoginDownload.onProgressUpdate(BookListActivity.java:475)
at com.nietky.librarythingbrowser.BookListActivity$LTLoginDownload.onProgressUpdate(BookListActivity.java:1)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:432)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4633)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
at dalvik.system.NativeStart.main(Native Method)