Android OS 2.2 Permissions: I have absolutely no idea why this simple piece of code doesn't work. What am I doing wrong?

Question

I'm just playing around with some code. I create an Activity and simply do something like this:

long lo = currentTimeMillis();
System.out.println(lo);

lo *= 3;
System.out.println(lo);

SystemClock.setCurrentTimeMillis(lo);
System.out.println( currentTimeMillis() );

Yes, in my AndroidManifest.xml, I've added:

<uses-permission android:name="android.permission.SET_TIME"></uses-permission>
<uses-permission android:name="android.permission.SET_TIME_ZONE"></uses-permission>

Nothing changes. The SystemClock is never reset...it just keeps on ticking. The error that I'm getting just says that the permission "SET_TIME" was not granted to the program. Protection level 3.

The permissions are there...and in the API for 2.2 it says that this feature is supported now. I have no idea what I'm doing wrong.

If android.content.Intent; comes into play, please explain. I don't really understand what the idea behind intents!

Thanks for any help!

Answer 1

There is a SET_TIME_ZONE permission but there's no SET_TIME permission. Applications cannot programmatically change the system clock.

Update

SET_TIME is available since 2.2, but can only be granted to the system process or apps signed with the system signature.

Answer 2

using AlarmManager with SET_TIME permission to set system time seems to work :)