I advise you to review the guidelines , principally in this case those of the icons to launch the application ( launcher icons ). To avoid showing small or large, you should consider creating your icons with the measures:
- 36 x 36 px for the folder
/mipmap-ldpi
- 48 x 48 px for the folder
/mipmap-mdpi
- 72 x 72 px for the folder
/mipmap-hdpi
- 96 x 96 px for the folder
/mipmap-xhdpi
- 144 x 144 px for the folder
/mipmap-xxhdpi
- 192 x 192 px for the folder
/mipmap-xxxhdpi
You can also add the icon launchers graphics within their respective /drawable-
folder, but for good practice they should now be within /mipmap-
link
I created an icon by entering a png image for the application using
"image assets"
For the case of launcher icons, the ideal is what I mention, although if you want to add only one image I advise you better to use a vector graphic that could look similar in all sizes and resolutions, but it should be added as "Vector Asset" .