Finally created a structure which handle layouts and icon for multiple screen. Android generalises device displays into categories based on two parameters: Screen size, the physical size of the display (measured diagonally) Screen density, the physical pixel density of the display (in pixels-per-inch, or ppi)` Screen size Android defines four generalised screen sizes: Qualifier Size small ~ 3 inches ( approx ) normal ~ 4 inches ( approx ) large Exceeds 4 inches xlarge Exceeds 7 inches Most phones are classified as small or normal (roughly 3 to 4 inches diagonally) A small tablet like the Samsung Galaxy Tab is classified as large (larger than 4 inches) Extra-large applies to large devices, for example large tablets Android defines four generalised screen densities: Qualifier Description Nominal value ldpi low density 120 ppi mdpi ...