From my Termux API app modification, I try to start Element app, but I get the following error:

```
java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10001000 xflg=0x4 pkg=im.vector.app cmp=im.vector.app/im.vector.application.features.Alias } from ProcessRecord{8d7d70a 12456:com.termux.api/u0a187} (pid=12456, uid=10187) with launchDisplayId=27
```

while it works fine with physical display, why?
Mar 13, 8:32pm

The error you're encountering is related to Android's security model and how it handles display affinity and permissions when launching apps programmatically, especially in a multi-display or headless environment (like Termux or a secondary display).

Key Points from the Error:

  • Permission Denial: The system is blocking the intent because the calling process (Termux API) does not have the necessary permissions or context to launch the app on the specified display.
  • launchDisplayId=27: The intent is trying to launch the app on a specific display (ID 27), which is likely not the primary display. Android restricts launching apps on non-primary displays unless explicitly allowed.
  • Termux API Limitations: The Termux API app runs in a restricted sandbox and may not have the privileges to launch apps on secondary displays or in certain contexts.

Why It Works on Physical Display:

When you launch the app manually (e.g., from the launcher), Android uses the primary display by default, and the system grants the necessary permissions implicitly. The Termux API, however, is trying to launch the app programmatically, and Android enforces stricter checks for security reasons.

Possible Solutions:

1. Force Launch on Primary Display

Modify your intent to explicitly target the primary display (usually display ID 0). You can do this by setting the launchDisplayId to 0 or omitting it entirely, as the default is the primary display.

Example (in your Termux API code):

bash
am start -n im.vector.app/im.vector.application.features.Alias --display 0

2. Check Termux API Permissions

Ensure the Termux API app has all the necessary permissions, especially:

  • android.permission.INTERACT_ACROSS_USERS
  • android.permission.SYSTEM_ALERT_WINDOW (if applicable)
  • android.permission.WRITE_SECURE_SETTINGS (rarely granted to non-system apps)

However, some of these permissions are restricted and cannot be granted to regular apps (including Termux API) without root access or ADB commands.

3. Use ADB to Launch the App

If you have ADB access, you can try launching the app via ADB, which bypasses some of the restrictions:

bash
adb shell am start -n im.vector.app/im.vector.application.features.Alias

4. Check for Multi-Display Support in Element

Some apps (like Element) may not fully support being launched on secondary displays or in headless environments. If Element is not designed for this, it may fail regardless of permissions.

5. Use Tasker or Automation Apps

If Termux API is too restrictive, consider using automation apps like Tasker or MacroDroid, which can sometimes launch apps in specific contexts with more flexibility.

Debugging Steps:

  1. Verify Display IDs: List all connected displays to confirm the ID of the primary display:

    bash
    dumpsys display

    Look for HDR10DisplayView or displayId=0 (usually the primary display).

  2. Test with a Simpler App: Try launching a basic app (e.g., com.android.calculator2) using the same method to isolate whether the issue is specific to Element or a general restriction.

  3. Logcat Output: Check logcat for more detailed errors:

    bash
    logcat | grep -i "Permission Denial"

Example Fix:

If you're using the Termux API to launch the app, try this command:

bash
termux-open --view im.vector.app

or:

bash
am start -n im.vector.app/im.vector.application.features.Alias --display 0
Mar 13, 8:32pm

This is a shared conversation and may include unverified content that doesn't reflect Mistral AI's views. Login to resume chatting.

Vibe can make mistakes. Check answers. Learn more