Android：如何创建不同大小和密度的图像？

Question

I have an image view which has different size on normal and large sized screens(I achived it via dimens.xml), lets assume 100*100 dp on small and 133*133 dp on large sized screen.

I'm setting image to it programatically, let's say it is def.png

Now for best performance I should create 6 versions of def.png(assuming i cater only to mdpi, hdpi and xhdpi densities)

1. small-mdpi - 100*100 px
2. small-hdpi - 150*150 px

3. small-xhdpi - 200*200 px

4. large-mdpi - 133*133 px

5. large-hdpi - 199*199 px
6. large-xhdpi - 266*266 px

It means 6 def.png images, but I can put 3 of them because only 3 folders are available ie drawable-mdpi, drawable-hdpi, drawable-xhdpi .

How should I achieve best performance so that there will be less scaling up and down of Images ??

or

If it is not possible this way, then what are the alternatives ?

Answer 1

How to Support Multiple Screens:-

• Explicitly declare in the manifest which screen sizes your application supports
• Provide different layouts for different screen sizes
• Provide different bitmap drawables for different screen densities

Source :- https://developer.android.com/guide/practices/screens_support.html#support