The "Install Android package" task doesn't take kindly to filenames with spaces in them:
Filename: My App-debug.apk
[android] Installing APK file 'My App-debug.apk'
[1.6] $ /android-sdk/platform-tools/adb -s emulator-46162 install -r My App-debug.apk
can't find 'App-debug.apk' to install
Filename: My\ App-debug.apk
[android] Could not find APK file '/home/hudson/workspace/.../1.6/My\ App-debug.apk' to be installed
Filename: "My App-debug.apk"
[android] Could not find APK file '/home/hudson/workspace/.../1.6/"My App-debug.apk"' to be installed
This should work without having to quote or escape anything.