4/1/2023 0 Comments Android image bucketHow to determine device density and its scale factor? Also, it’s called in some places baseline density. In screens with 160 dpi, 1dp is roughly equal to 1px. Of course, there is also nodpi (resources for all densities) and tvdpi (resources intended for TVs) buckets, but we will not cover them in this article. The ldpi bucket is not very common anymore.Īs you see, Android has 6 density buckets. mdpi - medium density bucket (~160dpi, 1x) hdpi - high density bucket (~240dpi, 1.5x) xhdpi - extra high density bucket (~320dpi, 2x) xxhdpi - extra-extra high density bucket (~480dpi, 3x) xxxhdpi - extra-extra-extra high density bucket (~640dpi, 4x) So how it can be independent of density? To answer this, let me introduce the different density buckets, which exist in Android: ldpi - low density bucket (~120dpi, 0.75x). If you’re confused, read about PPI/DPI one more time. But if the device density will be 400 dpi, it will take 0.5 inches instead. Now, if the device density will be 100 dpi, this ImageView will take 2 inches width and height on the screen. Assume we have an ImageView which width and height are 200x200px. You know, if we will specify our view size in pixels, it will change its size regarding density. So what means density-independent? It means, that our view size will be independent of the screen density. No? Just read it again more carefully))ĭensity, DPI and PPI are interconnected. for the device with a resolution 1080x1920 and 5.5 inches size we can say that device screen density is ~401. In Android, DPI is just a measurement unit, which represents the density. *Density is the same as DPI, it shows the pixels count in 1 inch area. Avoid using SP as a unit for non-text components. SP should be used only as a unit for text. * SP (Scale-independent pixels) is the same as DP, with an additional scaling factor that is based on the font size which the user selects in the device’s system settings. The only reason is that DP is more consistent with SP (Scale-independent pixels). DP (Density-independent pixels) is the same as DIP, don’t get confused. * In Android, when we create the UI, mostly we use DP as the size specifier for the views. Take a bit of special care here to not get confused later. In which device the screen quality will be better? The answer we need to find in the next section.įrom now, I will use DPI instead of PPI, because those are the same thing. Now a question for you: Suppose we have 2 devices, they have the same resolution 1080x1920, but the first device screen size is 7.0 inches and the other one 5.5 inches. Overall there will be 1080 * 1920 = 2 073 600 pixels on the screen. So how these screen size and pixels are connected? Let’s take a display, which resolution is 1080x1920 (width x height) and screen size is 5.5 inches. If the distance is 6.5 inches then the screen size is 6.5. Now, what is the screen size? It is the distance between opposite corners. If the monitor resolution is 3840x2160, overall it has 8 294 400 pixels. With higher density, the quality of the image will become better. If the monitor resolution is 1280px width and 720px height then overall that monitor has 921 600 pixels. They are the basic building blocks of a digital image or display. Pixel is also stand for picture element (pix = picture, el = element). If you will capture your monitor and zoom in, you can see small squares with an RGB color in them.
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