Domanda DPI

[mattator]

Ragazzi io non ho capito una cosa apparentemente semplice.

Dpi significa punti per Pollice, in pratica più punti ci sono per Pollice più il display è definito.
Ma allora come mai nelle rom moddate che prevedono il poter cambiare i dpi questi vanno a scalare?

Dpi stock di Note 3 480
Alcune rom fanno modificare in 420 e 360 ma questo non vuol dire diminuire la risoluzione? Come mai se abbasso i dpi ho più spazio per un numero maggiore icone? A me sarebbe tornato il contrario..

Grazie

[mattator]

Allora sono andato qui
http://members.ping.de/~sven/dpi.html
E facendo il calcolo mi viene che i dpi stock del note 3 sono 386 quindi le rom che portano la definizione fino a 480 aumentano e il ragionamento mi torna. Ma allora perché in un video ho sentito dire a soloilmeglio (non proprio il primo venuto) che i dpi stock del note 3 sono 480?
Qualcuno mi sa rispondere?

[soloilmeglio]

http://developer.android.com/guide/p...s_support.html


Terms and concepts

Screen size
Actual physical size, measured as the screen's diagonal.
For simplicity, Android groups all actual screen sizes into four generalized sizes: small, normal, large, and extra large.

Screen density
The quantity of pixels within a physical area of the screen; usually referred to as dpi (dots per inch). For example, a "low" density screen has fewer pixels within a given physical area, compared to a "normal" or "high" density screen.
For simplicity, Android groups all actual screen densities into four generalized densities: low, medium, high, and extra high.

Orientation
The orientation of the screen from the user's point of view. This is either landscape or portrait, meaning that the screen's aspect ratio is either wide or tall, respectively. Be aware that not only do different devices operate in different orientations by default, but the orientation can change at runtime when the user rotates the device.

Resolution
The total number of physical pixels on a screen. When adding support for multiple screens, applications do not work directly with resolution; applications should be concerned only with screen size and density, as specified by the generalized size and density groups.

Density-independent pixel (dp)
A virtual pixel unit that you should use when defining UI layout, to express layout dimensions or position in a density-independent way.
The density-independent pixel is equivalent to one physical pixel on a 160 dpi screen, which is the baseline density assumed by the system for a "medium" density screen. At runtime, the system transparently handles any scaling of the dp units, as necessary, based on the actual density of the screen in use. The conversion of dp units to screen pixels is simple: px = dp * (dpi / 160). For example, on a 240 dpi screen, 1 dp equals 1.5 physical pixels. You should always use dp units when defining your application's UI, to ensure proper display of your UI on screens with different densities.

[mattator]

Addirittura la risposta del maestro!!
Grazie

[mattator]

http://developer.android.com/guide/p...s_support.html


Terms and concepts

Screen size
Actual physical size, measured as the screen's diagonal.
For simplicity, Android groups all actual screen sizes into four generalized sizes: small, normal, large, and extra large.

Screen density
The quantity of pixels within a physical area of the screen; usually referred to as dpi (dots per inch). For example, a "low" density screen has fewer pixels within a given physical area, compared to a "normal" or "high" density screen.
For simplicity, Android groups all actual screen densities into four generalized densities: low, medium, high, and extra high.

Orientation
The orientation of the screen from the user's point of view. This is either landscape or portrait, meaning that the screen's aspect ratio is either wide or tall, respectively. Be aware that not only do different devices operate in different orientations by default, but the orientation can change at runtime when the user rotates the device.

Resolution
The total number of physical pixels on a screen. When adding support for multiple screens, applications do not work directly with resolution; applications should be concerned only with screen size and density, as specified by the generalized size and density groups.

Density-independent pixel (dp)
A virtual pixel unit that you should use when defining UI layout, to express layout dimensions or position in a density-independent way.
The density-independent pixel is equivalent to one physical pixel on a 160 dpi screen, which is the baseline density assumed by the system for a "medium" density screen. At runtime, the system transparently handles any scaling of the dp units, as necessary, based on the actual density of the screen in use. The conversion of dp units to screen pixels is simple: px = dp * (dpi / 160). For example, on a 240 dpi screen, 1 dp equals 1.5 physical pixels. You should always use dp units when defining your application's UI, to ensure proper display of your UI on screens with different densities.

Ehm... Se dicessi che non ci ho capito quasi una mazza? Verrei (giustamente) bannato?

Deduco che quindi quando si parla delle tre situazioni possibili (480-420-360) ci si riferisca quindi a density independent pixel anziché a dpi, giusto?
Facendo il conto viene nel caso del note 3 che quindi 1 dp equivale a 2.25 pixel reali perché è 360/160
E quindi 480 (che abbiamo detto essere la densità stock del note3) equivale i realtà a 213 dp e a questo punto non mi torna più niente.

Mi spiegheresti meglio per favore?

[Picciotto]

continua qui https://www.androidiani.com/forum/mo...-le-icone.html e l'italiano una cosa gradita.....