I would like to uninstall the default camera app and instead use the FOSS Open Camera. And I would also like to access the camera from the lockscreen.
How can I do this in Android 6?
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While uninstalling the pre-installed camera app can be difficult as others have mentioned, it should be relatively easy to change your default camera app to Open Camera (or whatever camera app you prefer). I prefer Open Camera as well, so I also wanted the same thing.
To make Open Camera the default (or any camera app other than the pre-installed version), follow these steps:
Caveats: sometimes when either camera app updates, you have to do the process again. Usually it doesn't happen too often, only when big changes occur to the apps. Hope that helps!
Default camera is a system app, which requires root to uninstall default camera app. You can use Titanium Backup like app to remove system app (N.B: Removing system app will be harmful to your device).
Settings->Security, under device security, tap on settings icon near screen lock. Select Lock screen shortcuts. Tap on any left or right default icons, prompts to choose action: tap on select application. Tap on Apps on top, and select your required camera app(These setting is on Lineage 14.1 android nougat)
Android keeps changing how you can remove an app that's been set as the default for an action. Currently my phone is using Android 11; here, you need to go to:
There are also some apps that will show you the default app for all the various categories and skip you to this spot in preferences directly, which I find more convenient so I don't have to remember this long navigation tree.
Once you've done this, you can open the camera app via your normal shortcut (eg pressing power button twice on my phone) and you'll get the dialog that asks which app you'd like to use for that action in the future.
If you would like to do this without rooting your device, then I may have an answer (that has worked for me) on Android 12. So, you cannot uninstall the default camera app, but what you can do is disable it. And really, that's all you have to do in order to use another camera app as the default one (and I would guess that it works only if you don't have other camera apps.) This has worked for me when using ProShot on Motorola Moto G stylus 5g (2022).