Zhou Hao Zhou Hao - 1 year ago 101
Android Question

Which resource qualifier should I use to support 1080p, 720p android TV? - Android

In order to define different dimension values for 1080p and 720p android TV, I need to decide which qualifier I should use. When I'm trying to use something like values-sw1080p,values-sw720p, it doesn't work. The values in dimes.xml doesn't affect anything. But it works if I'm using qualifier like -sw540dp,-sw360dp. I don't really understand why like that. Any idea? Thanks.

Answer Source

First of all, you are substantially correct. You can use

sw360dp/ : 720p screens
sw540dp/ : 1080p screens

The reason why sw720p/sw1080p don't work is because they don't exist as qualifiers.

This is the official documentation about working with different screen sizes. As you can read, there are two different units to take into account if you want to calculate your dp folder: the pixel count (e.g., 720) and the pixel density (that is, the dot-per-inch unit, or how many pixels fit into a single inch).

The formula is pretty simple:

px = dp * (dpi / 160)

while in this case we have:

dp = px * 160 / dpi

Of course, a TV can have different densities: this table tells you more about it (source: official documentation).

Densities table

Let's assume we have a 1080p display with an extra high density (@320 dpi). We do the math

dp = 1080 * 160 / 320 = 540

So we get the appropriate folder to put your resources in.

EDIT: on that same page, it is stated that there is a specific tvdpi qualifier that you can use for your TV-related resources (around 213 dpi).

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