When the application no Activity (the only application I installed Service), adb install you may be prompted INSTALL_FAILED_VERIFICATION_FAILURE not be installed.
But the problem is not in the apk.
As long as the apk copied to the phone, you can open the safe by phone file manager.
Why is this the case? First explain the actual situation of the author's next.
Phone Lenovo K910 Android4.4.2 (the default music software security security within the phone)
to install applications ADBKeyboard (there is source code on github, so after checking out if an application is no problem)
After adb install ADBKeyboard.apk, suggesting INSTALL_FAILED_VERIFICATION_FAILURE
(later, only to find application installation confirmation screen flashed, can not click OK)
estimated that the mobile security software to detect app there are no Activity, mistakenly block the installation right. This can be done only mobile phone manufacturers, the general application of the virus, the phone will not let this happen.
Then I thought, apk files are copied to the phone installation is not possible through? Try really OK.