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並前往https://android.developreference.com/article/10254413/Howto+get+Back+Button+in+Actionbar+with+new+Jetpack+navigation

Howto get Back Button in Actionbar with new Jetpack navigation

setupActionBarWithNavController(this,nc, appBarConfiguration); Now I see a Backbutton in the ActionBar if I'm not in the start main fragment, ...

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