Drawable folders in res folder?

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I am going to take a guess that “the three drawable folders” are drawable-ldpi, drawable-mdpi, and drawable-hdpi. In that case, if you stick with all of those folders, you need to put one image in each, sized to match the indicated screen density. This is discussed in the online documentation as well as this blog post. You can find a set of sample projects showing use of different drawable resources based on screen density here.

If you are just starting out in Android development, you can get rid of all three of those directories and create a single drawable directory, putting your image in there. Eventually, though, for a quality application, you will want to test your images on different devices/emulators with different screen densities, and possibly have different images for each density to improve the look of your app.

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