Google suggests using
3 : 4 : 6 : 8 : 12 : 16 scaling ratios for
ldpi : mdpi : hdpi : xhdpi : xxhdpi : xxxhdpi accordingly. Example:
- 36x36 for low-density
- 48x48 for medium-density
- 72x72 for high-density
- 96x96 for extra high-density
- 144x144 for extra-extra-high-density
- 192x192 for extra-extra-extra-high-density
In your example, if mentioned button sizes are for hdpi, correct dimensions should be:
- 150x45 ldpi
- 200x60 mdpi
- 300x90 hdpi
- 400x120 xhdpi
- 600x180 xxhdpi
- 800x240 xxxhdpi
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