Failure [install_parse_failed_no_certificates] when attempting to install APK to the emulator

Solution 1:

This site helped me a lot to properly sign the unsigned apk. But,for the last process i.e. for jarsigner,following command need to be used

jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore    my_application.apk alias_name.

Further do look upon this unable to sign zipexception if you encounter with any zipexception error . So overall,use following procedure

1. keytool -genkey -v -keystore debug.keystore -alias android -keyalg RSA -keysize 2048 -validity 20000
2. jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore yourapkalign.apk alias_name
3. zipalign -v 4 yourapk.apk yourapkalign.apk

Now,you can successfully install the apk file.

Solution 2:

It means that the apk you downloaded hasn't been signed with any certificate, debug or otherwise.

You can sign it from the command line, as described here.