support buletooth printer for android
#requirements
1.Android Studio
2.NDK Installed
3.minSdkVersion=9
4.compileSdkVersion=22
#compile steps
1.clone repository
2.edit the file "./wnprinter/local.properties"
change "sdk.dir=(Your Android-SDK path)"
change "ndk.dir=(Your Android-NKD path)"
3.import the wnprinter
4.build