adb shell command to make Android package uninstall dialog appear

You can do it from adb using this command:

adb shell am start -a android.intent.action.DELETE -d package:<your app package>

Use this command in cmd:

adb shell pm uninstall -k com.packagename

For example:

adb shell pm uninstall -k com.fedmich.pagexray

The -k flag tells the package manager to keep the cache and data directories around, even though the app is removed. If you want a clean uninstall, don't specify -k.

Using ADB, you can use any of the following three commands:

adb shell am start -a android.intent.action.UNINSTALL_PACKAGE -d "package:PACKAGE"
adb shell am start -n com.android.packageinstaller/.UninstallerActivity -d "package:PACKAGE"
adb shell am start -a android.intent.action.DELETE -d "package:PACKAGE"

Replace PACKAGE with package name of the installed user app. The app mustn't be a device administrator for the command to work successfully. All of those commands would require user's confirmation for removal of app.

Details of the said command can be known by checking am's usage using adb shell am.

I got the info about those commands using Elixir 2 (use any equivalent app). I used it to show the activities of Package Installer app (the GUI that you see during installation and removal of apps) as well as the related intents. There you go.

The alternative way I used was: I attempted to uninstall the app using GUI until I was shown the final confirmation. I didn't confirm but execute the command

adb shell dumpsys activity recents   # for Android 4.4 and above
adb shell dumpsys activity activities # for Android 4.2.1

Among other things, it showed me useful details of the intent passed in the background. Example:

intent={act=android.intent.action.DELETE dat=package:com.bartat.android.elixir#com.bartat.android.elixir.MainActivity flg=0x10800000 cmp=com.android.packageinstaller/.UninstallerActivity}

Here, you can see the action, data, flag and component - enough for the goal.