Does anyone know about android and creating flashable zips?

[chris-red]

I want to create a flashable zip to edit 2 system files in on an android device.

I have tweaked my system to have a better DPI and louder speaker.

Everytime I update these changes are erased, it is most annoying as the resolution change borks my icons/widgets and I have to recreate it all.

I was hoping I could get these changes in a ZIP so I can flash it when I flash the update/SuperSU/Xposed etc.

It will need to add a line to 'Build.Prop' in /System and change a few lines in 'MixerPaths.xml' in /System/Etc.

Can anyone do this/show me how to do it?
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[J.M.]

Are you comfortable with writing scripts?

Take a look at this:
https://www5.zippyshare.com/v/RvfbVEkr/file.html

Use that as a template. They've done the legwork involving creating a flashable zip. It runs the /tmp/mytweaks.sh file when you flash the zip. This is run by the com/google/android/updater-script

This sh already takes care of changing the build.prop (and actually the DPI).

You can extend the mytweaks.sh to then change what you need to in MixerPaths.xml.

Easiest is appending lines. If that's not possible, next easiest is bundling a modified MixerPaths.xml in the zip and replacing the existing. Most difficult is modifying lines using the script, but you could probably utilise sed or something to do it.
____________________
2004 R1 & 2018 XSR900

[J.M.]

Did you have any luck with this? I can lend a hand if there's anything that's not working properly.
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2004 R1 & 2018 XSR900

[chris-red]

I haven't had I look yet but will next week, thanks for your input I'll let you know.
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[chris-red]

[J.M.]

That script is written with OnePlus Two in mind as the build prop doesn't contain any entry for DPI. All the script does is add the line to the build.prop file.

If you look at the bash script you will see how it does it.

If you already have a build prop with DPI listed, I would probably delete the file and modify the script.

I'd personally make it create a backup, then pipe it through a command like sed to replace your existing entry (if there is one). Otherwise I'd leave the script be.

The bonus of modifying through sed means that you XML tweak would be a simple extension of the DPI code.
____________________
2004 R1 & 2018 XSR900

[chris-red]

My phone is a OP2, so the script should be fine.

I'm ok with the script until the last section that actually does the work it loses me there.

Do you have an example of how to change a value rather than add it?

Another q

Is everything in the in the META-INF folder generic and not to be worried about?

Cheers,
Chris
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[J.M.]

[J.M.]

What changes did you make in MixerPaths.xml?

I'm going to put together a flashable zip today because I want to change my DPI and I'm no longer rooted, so I might as well do your change too seeming as you think it's beneficial and we have the same device
____________________
2004 R1 & 2018 XSR900