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A with CAndroid, I used 7z to unzip the .apk file.
7z
.apk
7z x candroid.apk
Then I grepped all the files to see if there were any references to flag. If there were, I checked them out.
flag
grep -rnw "flag"
This shows match in "classes.dex"
cat classes.dex | grep flag
flag{3asY_4ndr0id_r3vers1ng}