# Update asset, rebuild quickly - gradle command line for that?
**URL:** https://discourse.processing.org/t/update-asset-rebuild-quickly-gradle-command-line-for-that/4114
**Category:** Processing for Android
**Created:** [October 4, 2018, 8:26am UTC](https://discourse.processing.org/t/update-asset-rebuild-quickly-gradle-command-line-for-that/4114 "2018-10-04T08:26:14Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@dtmr](https://discourse.processing.org/u/dtmr)
#### Post date: [October 4, 2018, 8:26am UTC](https://discourse.processing.org/t/update-asset-rebuild-quickly-gradle-command-line-for-that/4114/1 "2018-10-04T08:26:14Z")
Does anybody know the command line to repeat the build process for a temporary build directory (found on disk after “Run in emulator”)? The Processing for Android site states unter ‘What’s new in version 4’: “The export project option in the PDE will now create a Gradle project that you can build directly from the command line”.
My goal is to replace one (1) file in the app’s assets directory and re-build as quickly as possible, as I plan to give each user of my sofware an individual apk with an individual file (via my own site, not Play Store).
If a command line build wouldn’t be much faster than building through PDE: Alternatively, I’m looking for a command line to re-sign an apk (the one generated by “Run in Emulator”) with the developer key after replacing a file in the apk (unzip, replace file in app’s assets directory, zip, sign).
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### Author:  [@dtmr](https://discourse.processing.org/u/dtmr)
#### Post date: [October 5, 2018, 6:01pm UTC](https://discourse.processing.org/t/update-asset-rebuild-quickly-gradle-command-line-for-that/4114/2 "2018-10-05T18:01:58Z")
> looking for a command line to re-sign an apk … after replacing a file in the apk
Googled a bit:
1. Begin build with “Run in Emulator” in Processing’s Android mode
2. Build path is displayed at beginning of build process, remember (copy), e.g. C:\Users\\AppData\Local\Temp\android4985002123845272925sketch
3. After build, find apk in that build directory, e.g. “…exampleandroid\_debug.apk” (… stands for full path)
4. Unpack with WinZip (temporarily change suffix to .zip), change as desired, re-pack with WinZip
5. Run zipalign: \sdk\build-tools\26.0.2\zipalign 4 “…exampleandroid\_debug.apk” “…exampleandroid\_aligned.apk”
6. Sign with debug key: \sdk\build-tools\26.0.2\apksigner sign --ks C:\Users\.android\debug.keystore --ks-pass pass:android --out “…result.apk” “…exampleandroid\_aligned.apk”
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### Author:  [@jb4x](https://discourse.processing.org/u/jb4x)
#### Post date: [October 5, 2018, 7:58pm UTC](https://discourse.processing.org/t/update-asset-rebuild-quickly-gradle-command-line-for-that/4114/3 "2018-10-05T19:58:51Z")
Thanks for sharing the answer with the forum 👍