Step 1: Get Certificate

jcenter() equals to

You need import jcenter’s cerficate into your java keystore.

Visit jcenter using your browser and export the certificate as .cer file. (lock icon on the left of Firefox address bar, or Chrome developer tool secuity tab. Internet Explorer and Edge do not support saving of Website certificates, though.)

Step 2: Import Certificate In Android Studio, go to File -> Settings -> Tools -> Server Certificates.

Under Accept certificates click on + . Select the exported certificate.

Step 3: Refresh Keystore In Android Studio, go to File -> Invalidate Caches/Restart.... Select Invalidate and Restart from the message box that appears.