(In the details of length units in Android (dp, sp, px, in, pt, mm), we can see that many people do not understand the difference between dp, sp and px. Now let's introduce dp and sp. Dp is also called dip. This is basically similar to sp. If you can use dp or sp when setting attributes such as length and height. But if you set the font, you need to use sp. Dp is density independent, sp is not only density independent, but also scale independent. If the screen density is 160, then dp, sp and px are the same. 1dp=1sp=1px, but if you use px as the unit, if the screen size remains unchanged (assuming it is still 3.2 inches), the screen density becomes 320. Then the width of TextView is originally set to 160px, which is half shorter on a 3.2 inch screen with a density of 320 than on a 3.2 inch screen with a density of 160. But if it is set to 160dp or 160sp. The system will automatically set the width attribute value to 320px. That is 160
320/160。 320/160 can be called density share factor. That is, if you use dp and sp, the system will automatically convert according to the change of screen density.)
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