Modifying Home.apk - compiles, but phone doesn't like it - Xperia Play Android Development

I'm running stock UK framework with Android 2.3.4. Build number: 4.0.2.A.0.42.
I'm trying to modify Home.apk. I decompile it using apktool (I have if-ed framework-res.apk, SemcGenericUxpRes.apk and SystemUI.apk). Then I do the fix in styles.xml - replacing
Code:
<style name="Layout.ButtonContainer">
with
Code:
<style name="Layout.ButtonContainer" parent="@android:style/Theme.Wallpaper.NoTitleBar">
, because it doesn't compile otherwise.
Then I compile (without even changing anything else), sign and adb push it onto my phone, but the phone doesn't want to run it. The app manager doesn't show it on the list and the home key is ignored. If I reboot, the screen is stuck displaying the SE logotype, but because of its vibrating feedback and the ability to turn the screen off/on, I can tell that I'm in the lockscreen.
I also tried putting the META-INF and AndroidManifest.xml from the original into the modified apk, like you need to do with framework-res, but it's still the same problem.
The same thing happens if I try to install any unofficially modified Home.apk from the Internet.
What am I doing wrong?

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Fußbodenheizung said:
I'm running stock UK framework with Android 2.3.4. Build number: 4.0.2.A.0.42.
I'm trying to modify Home.apk. I decompile it using apktool (I have if-ed framework-res.apk, SemcGenericUxpRes.apk and SystemUI.apk). Then I do the fix in styles.xml - replacing
Code:
<style name="Layout.ButtonContainer">
with
Code:
<style name="Layout.ButtonContainer" parent="@android:style/Theme.Wallpaper.NoTitleBar">
, because it doesn't compile otherwise.
Then I compile, sign and adb push it onto my phone, but the phone doesn't want to run it. The app manager doesn't show it on the list and the home key is ignored. If I reboot, the screen is stuck displaying the SE logotype, but because of its vibrating feedback and the ability to turn the screen off/on, I can tell that I'm in the lockscreen.
I also tried putting the META-INF and AndroidManifest.xml from the original into the modified apk, like you need to do with framework-res, but it's still the same problem.
The same thing happens if I try to install any unofficially modified Home.apk from the Internet.
What am I doing wrong?
Click to expand...
Click to collapse
Did you try setting permissions to rw-r--r-- in root explorer?

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Thanks for replying.
Yes, I tried setting the permissions, but it doesn't change anything.
The official Home.apk, however, runs regardless of the permissions (unless reading the file is set as forbidden, I guess).

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Fußbodenheizung said:
Thanks for replying.
Yes, I tried setting the permissions, but it doesn't change anything.
The official Home.apk, however, runs regardless of the permissions (unless you forbade reading, I guess).
Click to expand...
Click to collapse
Yeah I scimmed the detail. What were you trying to change? You could download the Modded Xperia S (themed) Home.apks from my thread. http://forum.xda-developers.com/showthread.php?t=1655622

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Thanks for trying to help, but if I try to use one of your Home.apks launchers, the same thing happens.
Another thing I'd like to mention is that sometimes the phone treats the app as if it doesn't exist (as described in the OP), but sometimes it does recognize it, but it force closes as soon as it tries to run.
EDIT: Actually, I think I've fixed it. If I uninstall the launcher first, instead of just replacing it, it seems to work so far.