I have encountered with same problem on Android Studio:
AAPT out(943142208) : No Delegate set : lost message:Done
AAPT err(943142208): ERROR: 9-patch image /Users/cartman/Github/UteacherAndroid/RefactorDemo/app/src/main/res/drawable-xxhdpi/nav_shabow.9.png malformed.
AAPT err(943142208): Frame pixels must be either solid or transparent (not intermediate alphas).
AAPT err(943142208): Found at pixel #1 along left edge.
This is how I resolved it: Open draw9patch tool under your Android Sdk directory
cd /Android/sdk/tools
./draw9patch
Open .9 png and save it again. Hope it helps.