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I developed an application in android studio and signed it, but when I try to install that I have this alert message

enter image description here

that says your phone and personal data are more vulnerable to attack by unknown apps...

why when I sign the app get this alert?

I must tell you that I live in Iran, may it be subject to sanctions?

I changed the package manager and the sign allot of but doesn't work and tried to put it on this site https://support.google.com/googleplay/android-developer/contact/protectappeals

but it keeps telling me cant download your app
can anybody help me?

Edited My problem solved that's error to happen because i install my apk from my SD card to my phone when i exam that to another phone by Bluetooth and so on thats ok hope it's helpful for others

paran moghimi
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    how did you sign it and how did you install the app? – Gratien Asimbahwe Oct 21 '18 at 09:15
  • @gratient asimbahwe i sign that by the Build menu and then Generate and sign Bundle or apk after make key and other .... create in release mode and install that apk in my phone sorry for my bad English language – paran moghimi Oct 21 '18 at 09:21
  • did you install the apk manually or you used android studio? what are permissions requested for the app? – Gratien Asimbahwe Oct 21 '18 at 09:23
  • Install that manually , copy that apk by usb cubl to my phone and then install that. permissions are just phone state and network and permission.C2D_MESSAGE – paran moghimi Oct 21 '18 at 09:26
  • one time commented all pernission and rebuild and make apk but still have that alert – paran moghimi Oct 21 '18 at 09:27
  • I think some apps can be considered unknown app for begining, after some users download app it should be ok - I am not sure about it, I remember some situation like this on stackoverflow over 1 year ago I think – Janusz Hain Oct 22 '18 at 09:25

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If you are trying to install Debug-APK its normal to see is as unknown app and ask you for permission, however if you are getting the same message with Release-APK than please check this out "Unknown Source" in release apk

hossam scott
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My problem solved that's error to happen because i install my apk from my SD card to my phone when i exam that to another phone by Bluetooth and so on thats ok hope it's helpful for others

paran moghimi
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