I spent some hours trying to solve this:
app:mergeDebugResources AAPT err(927129865): C:\\Users\\Will\\AndroidStudioProjects\\Splitter2\\app\\build\\i
I tried to fix the problem and get these annoying warnings disappeared. What really helped me: delete meta data from your png file (I guess you don't need it).
brew install exiftool
find . -path '*src/main/res/*' -name '*.png' -exec exiftool -overwrite_original -all= {} \;
See details in Jake Wharton's answer https://groups.google.com/forum/#!msg/adt-dev/rjTQ_STR3OE/-UcNQRISTKsJ