how to get Activity's windowToken without view?

I faced exactly the same problem, while writing OnPageChangeListener within an Activity. You can use one of these solutions. Either:

getWindow().getDecorView().getRootView().getWindowToken()

or:

findViewById(android.R.id.content).getWind‌owToken()

Surely you can use:

getContentView().getWindowToken()

or you can refer to SO Quest

Simply use getWindow().getDecorView().getWindowToken()

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