But you could make it like the first version that was that way and had of course a background so that people wouldn't see anything but if you could work on it to at least display previous screen like the home screen or recents as a background under the window or even better, the real app but with blur effect. Think about it. Shouldn't be that hard... for you
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And I also took a look at the blur effect but that seems not that easy since android does not support it anymore by default.....
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