Follow the below steps to sign the application in the android studio:-
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First Go to Build->Generate Signed APK

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Then Once you click on the Generate Signed APK then there is info dialog message appear.

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Click on the
Create Newbutton if you don’t have any keystore file. If you have click on theChoose Existing.
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Once you click on the
Create Newbutton then now dialog box appear where you need to enter the keystore file info, other signing authority details.
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Once you fill complete details then click on the
Okbutton then it redirect to this dialog.
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Click on the Next button then check mark on the
Run ProGuardand click on the finish. It generate the signed APK.
