If you install Android Studio by extracting a Zip file on Linux, it will come without any launch icon. This post assumes that have extracted the install archive to /usr/local and run any recent version of Linux which has Gnome:

unzip android-studio-ide-145.3537/39-linux.zip -d /usr/local

Simply write the following text to ~/.local/share/applications/android-studio.desktop (change paths if your install location differs).

[Desktop Entry]
Comment=Android Studio
Terminal=false
Name=Android Studio
Exec=/usr/local/android-studio/bin/studio.sh
Type=Application
Icon=/usr/local/android-studio/bin/studio.png

Once you save the file, it will appear in your local applications like this:

This can also be added graphically though the Alacarte menu editor if you have it installed.