Will a density qualified drawable folder or drawable-nodpi take precedence?

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余生分开走 2020-12-04 18:39
If I define drawables for a density qualified folder (eg drawable-hdpi), and also drawables to fall back on in drawable-nodpi, will a high de

      
      
        
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                   [愿得一人]
                                             
                
                
                (楼主)
            
              
              
                2020-12-04 18:53
              

            
            
                        
drawable-nodpi will bypass scaling and  drawable will use the default scaling: 
 mdpi = 1x
 hdpi = 1.5x
 xhdpi = 2x
 xxhdpi = 3x
 xxxhdpi = 4x

drawable-nodpi is efficient if your code will be doing its own scaling 
 (or no scaling) and you don't want the image pre-scaled by Android.

There is also drawable-anydpi, just to make things more confusing.

drawable with no specifications will be used if an exact match on density and screen specifications does not exist. drawable-nodpi will be used after drawable. 

UPDATE If you have both drawable and drawble-nodpi, the select order is either a more complex rule not documented or Android is broken.  Through experimentation I confirmed that devices with screen density < xhdpi will correctly select the drawable image.  Devices with screen density >= xhdpi will select the drawable-nodpi. 

Selection rule:
1. Pick match to screen density, one of these:


 drawable-ldpi
 drawable-mdpi
 drawable-hdpi
 drawable-xhdpi
 drawable-xxhdpi
 drawable-xxxhdpi



If no match on density, then select one of these



 drawable (automatic scaling mdpi=none... xxxhdpi=4x)  
 drawable-nodpi (no scaling)
 drawable-tvdpi
 drawable-anydpi (no scaling)

    
             
                                                        
            
            
              
                
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