How to avoid my app being debugged on android emulator ?

I found that most released apps(including system apps) can be debugged on the emulator by the way following:
1. install the app on the emulator, and launch it
2. run adb shell ps to get the pid of the app
3. run adb jdwp, if you find the pid in the output, then you can attach to the app by running
adb forward tcp:1234 jdwp:$pid_you_find and jdb -connect com.sun.jdi.SocketAttach:hostname=localhost,port=1234
4. you can use commands such as "classes" to see the classes of the app, even "stop" to set breakpoint and "eval" to run many functions and see the members of the objects.
I have 2 questions:
1. Why these tricks fail on the phones? What's the difference between the rom of emulator and phones?
2. How to avoid my app being debugged through such way?

2 Answers

Following links should be helpful http://developer.android.com/reference/android/os/Debug.html#isDebuggerConnected%28%29

answer Aug 25, 2013 by Amit Parthsarthi

1) On Emulators, debug or eng builds you have ro.debuggable = 1, which allows all apps to be debugged. on production builds this is set to 0 so to debug an app you have to set it from the app's manifest.
2) you cant, as you cant stop smb decompiling it. if u r afraid of smb sees what u r app does better obfuscate it.

answer Aug 25, 2013 by Majula Joshi

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How to avoid my app being debugged on android emulator ?

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