I will answer my question. I have found a solution.
UPDATE: I could not install apk bcoz unsigned apk could not be installed. To install, you need to sign it using a certificate (debug or release).
The debug key is signed in the out / production apk folder, not an unsigned one.
If anyone has a problem creating unsigned apk. here's the answer.
If you are using InteliJ IDEA or Android Studio.
https://www.jetbrains.com/idea/help/generating-an-unsigned-release-apk.html
If you are using eclipse, use
APK Eclipse, " Android" > " ". unsigned APK. ( AndroidManifest.xml Eclipse, " APK".)
Ant
Ant, , release ant. , ant , build.xml, :
$ant release
script APK . bin/ -unsigned.apk.
http://developer.android.com/tools/publishing/app-signing.html