Not always easy to debug android apps.
I made a plugin that helps you proberly setting up ida for debugging android apps.
Have adb from android sdk/platforms-tools in your path
copy android_server to adb folder from ida dbgserver folder
setup PATH
http://www.computerhope.com/issues/ch000549.htm
place Plugin in plugin folder.
find it under debugger menu.
follow the steps
Works Also with no file loaded in ida pro.
IF not working try copy the intire adb folder to ida root folder (including android_server)
includes also logcat
https://github.com/techbliss/ADB_Helper_For_ida_Pro