To open a specific app on a specific display using ADB (Android Debug Bridge) without explicitly specifying an activity, you can use the am start command with the package name of the app and the --display flag to target a specific display.

Command Syntax:

adb shell am start -n <package_name> --display <display_id>

Explanation:

• <package_name>: Replace this with the package name of the app you want to open (e.g., com.example.app).
• <display_id>: Replace this with the ID of the display you want the app to open on (e.g., 0 for the primary display, 1 for a secondary display, etc.).

Example:

If you want to open the app with the package name com.example.app on display 1, use:

adb shell am start -n com.example.app --display 1

Notes:

1. Package Name: Ensure you know the package name of the app. You can find it using:

   bash

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   adb shell pm list packages

   This lists all installed packages on the device.

2. Display ID: The display ID is typically 0 for the primary display. For secondary displays, it could be 1, 2, etc. You can check available displays using:

   bash

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   adb shell dumpsys display

3. No Activity Specified: The -n flag is used to specify the component (package/activity) to start. If you omit the activity, the system will use the default activity for the package.

4. Permissions: Ensure your device is authorized for ADB debugging and that USB debugging is enabled in the developer options.