In android Servic to track which application has focus - android

In android, is it possible to track which apk/ application is on the top/have focus.
This work to be done by a service. I don't have much knowledge regd this.
Thanks in advance.

ActivityManager.getRunningTask
RunningTaskInfo.topActivity
ComponentName.getPackageName
is that clear?

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Thanx for the replies.
Actually, I am in middle of coding where I want to restrict the manifest permission of other application.
Since, these kind of applications exist in market, then this is possible. Any more help or any reference would be so helpful.
thanx again.
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Thanks,
Sen
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Thanks All
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You obviously wanna make a trojan/virius for android.
And the answer is no unless you making a custom firmware.

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