Android development image resolution adaptation

1. The difference between drawable-(hdpi, mdpi, ldpi) DPI is the abbreviation of "dot Per Inch", the number of segments per inch. Four types of density classification: ldpi (low), mdpi (medium), hdpi (high), and xhdpi (extra high) General screen: ldpi is 120, mdpi is 160, hdpi is 240, and xhdpi is 320.

2. The difference between WVGA, hvga, and qvga is that VGA is "video graphics array", and the display standard is 640*480. The wide VGA resolution is 480*800 hvga (half VGA), that is, half of the VGA resolution is 320*480 qvga (quarter VGA), that is, the VGA non-1/4 resolution is 240*320.

3. drawable-(hdpi, mdpi, ldpi) and WVGA, hvga, qvga contact hdpi contains high-resolution images, such as WVGA (480x800), fwvga (480X854) the mdpi mainly contains medium-resolution images, such as hvga (320 × 480) ldpi, which mainly contains low-resolution images, such as qvga (240 × 320) the system will find the corresponding images in these folders according to the machine resolution.