Fix android.view.WindowManager$BadTokenException crashes#40

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zsoltboldizsar wants to merge 2 commits intoTruckMovers:masterfrom zsoltboldizsar:issue-31

+26-43

Commits on May 19, 2018

Avoid holding strong reference to activity and only show dialog if host activity is not finished yet.
Zsolt Boldizsár
committed

Commits on Aug 2, 2018

Set promptInterval back to its default value.
Zsolt Boldizsár
committed