I cloned a project from git and built it in android studio without any problems but I don't have (Run app) in android studio and also when I run run-android I get this error:
Failed to launch emulator. Reason: No emulators found as an output of `emulator -list-avds`
but I can run my emulator from AVD manager! I did every solutions that I found with search but they didn't work for me

For me, the reason was one of the following:
For the last two cases, go to your top-level or app build file and click Try again or Sync button on the notification shown at the top of the file.
You could also just try to sync the IDE with Gradle with either of these buttons:

I faced a similar error. I was trying to import a built apk to profile it and ran into the scenario where the run button was grayed out.
Ultimately what worked. I went to File > Manage IDE Settings > Restore default settings.. and redid the android studio setup.
Note: Doing this will RESET the entire Android Studio and redownload everything.
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