block Home Button in Ice cream sandwich and jelly bean

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Post ICS i.e. Android 4+, the overriding of the HomeButton has been removed for security reasons, to enable the user exit in case the application turns out to be a malware.

Plus, it is not a really good practice to not let the user navigate away from the application. But, since you are making a lock screen application, what you can do is declare the activity as a Launcher , so that when the HomeButton is pressed it will simply restart your application and remain there itself (the users would notice nothing but a slight flicker in the screen).

EDIT #1 : Here is another workaround, more suited to your needs.

EDIT #2 : Just came across this. Haven’t tested it. But looks kinda promising. Not sure if it would work, but you could give it a try.

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