filled up some features.
delete android-support-v4.jar
extract adapter to file.
remove dependency to MainActivity.
resolve an error.
remove dependency to MainActivity.
cleaning up.
create menu layout.
add progress layout.
show progress while loading.
add menu indicator.
update variable name & delete unused variable.
load playlist onResume method.
add empty view to content view.
clean up indentation.
fixed up indicator location when scroll through menu.