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Android R not generated



Ever encountered why Android R is not generated?

One quick solution is to delete the “gen” folder hoping, that it will be generated again since the folder is auto generated. But it works sometimes.. 

But if Android will not auto generate the R and problem will be not washed away.

And after deletion the problem still exists, and even after cleaning the project.

So now what?

If the XML in the "res" folder, such as the "layout" XML and "drawables" XML (drawable-hdpi, drawable-xhdpi etc..) if the XML has errors on any of these folders, it will cause R not to be generated.

If the XML are all okay and still R is not generated. 

Then open the drawables folder, if any of the PNG or any images its filenames has to be in lower case and filenames should only contain lower case letters and numbers.

So images on the drawable folders which has Upper Case letters will cause the R not to be generated.

File names of images on the drawable folder which has symbols will also cause the issue.

So to sum up, images with this file names below will cause  the Android R not be generated.

File names that will cause errors:

Myimage.png, myImage.png

Ny_picture.png, Picture-001.png


To make life simple, xml file names on the drawable folders should only contain lower case characters (a to z) and 0 to9 numbers, no symbols such as “-“ or underscore “_” character.



Hope it helps to save some headache… Cheers!!! 


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Android Divine Mercy Chaplet Guide  
https://play.google.com/store/apps/details?id=com.dmercyapp 

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