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"you Need To Use A Theme.appcompat Theme (or Descendant) With This Activity" When Using Appcompat Theme

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I have a very strange problem with my app. After updating to the newest versions of Support libraries I get this error: java.lang.RuntimeException: Unable to start activity Compone

Solution 1:

I have same problem when I've migrate to androidx. I've solve this by simply updating from

implementation 'androidx.appcompat:appcompat:1.0.0'

to

implementation 'androidx.appcompat:appcompat:1.0.2'

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