[Feature]: Add parameter --display to `am start`

[hanslub42]

Feature description

Add parameter --display to am (e.g. am start --display 9 no.nrk.yr/.MainActivity)

Additional information

Since version 4.0 scrcpy allows opening a new display (scrcpy --new-display=.....). Starting termux via scrpy (scrcpy --new-display=1000x1000 --start-app=com.termux) works well, termux will open on the new display. However, when I then use this termux instance to start an app (say with $ am start no.nrk.yr/.MainActivity) the app will appear on display 0 (the phone itself), and not on the new display, as I expected.

am --help does not mention displays at all. Is there a workaround?

[Benjamin-Loison]

scrcpy relies on adb, hence:

adb shell am start org.mozilla.fennec_fdroid/.App --display 3

Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=org.mozilla.fennec_fdroid/.App }

works fine.

However,

am start -n org.mozilla.fennec_fdroid/.App --display 3

Output:

Activity manager (activity) commands provided by the com.termux app.
These are similar to commands provided by the Android platform with the /system/bin/am command.

Usage: am [subcommand] [options]
       am start [-D] [-N] [-W] [-P <FILE>] [--start-profiler <FILE>]
               [--sampling INTERVAL] [-R COUNT] [-S]
               [--track-allocation] [--user <USER_ID> | current]
               [--check-draw-over-apps-permission] <INTENT>
       am startservice [--user <USER_ID> | current]
                       [--check-draw-over-apps-permission] <INTENT>
       am stopservice [--user <USER_ID> | current] <INTENT>
       am broadcast [--user <USER_ID> | all | current] <INTENT>
       am to-uri [INTENT]
       am to-intent-uri [INTENT]
       am to-app-uri [INTENT]
       am get-current-user

am: Options are:
    -h | --help: Show help
am start|start-activity: start an Activity.
Options are:
    -D: enable debugging
    -N: enable native debugging
    -W: wait for launch to complete
    --start-profiler <FILE>: start profiler and send results to <FILE>
    --sampling INTERVAL: use sample profiling with INTERVAL microseconds
        between samples (use with --start-profiler)
    -P <FILE>: like above, but profiling stops when app goes idle
    -R: repeat the activity launch <COUNT> times.  Prior to each repeat,
        the top activity will be finished.
    -S: force stop the target app before starting the activity
    --track-allocation: enable tracking of object allocations
    --user <USER_ID> | current: Specify which user to run as; if not
        specified then run as the current user.
    --check-draw-over-apps-permission: Check if calling package has
        Draw over other apps permission before starting activity since        starting activities from background may fail on Android >= 10.
        https://developer.android.com/guide/components/activities/background-starts
    --stack <STACK_ID>: Specify into which stack should the activity be put.
am startservice|start-service: start a Service.
Options are:
    --user <USER_ID> | current: Specify which user to run as; if not
        specified then run as the current user.
    --check-draw-over-apps-permission: Check if calling package has
        Draw over other apps permission before starting service since        starting foreground services from background may fail if targeting Android >= 12.
        https://developer.android.com/guide/components/foreground-services#background-start-restrictions

am stopservice|stop-service: stop a Service.
Options are:
    --user <USER_ID> | current: Specify which user to run as; if not
        specified then run as the current user.

am broadcast: send a broadcast Intent.  Options are:
    --user <USER_ID> | all | current: Specify which user to send to; if not
        specified then send to all users.
    --receiver-permission <PERMISSION>: Require receiver to hold permission.
On Android '>= 14', broadcast result will not be waited for and exit code will always be 0.

am to-uri: print the given Intent specification as a URI.

am to-intent-uri: print the given Intent specification as an intent: URI.

am to-app-uri: print the given Intent specification as an android-app: URI.

am get-current-user: returns user id for the current process if it is owned 
  by an app, otherwise current foreground user if it is owned by
  a privileged user like root or shell.


<INTENT> specifications include these flags and arguments:
    [-a <ACTION>] [-d <DATA_URI>] [-t <MIME_TYPE>]
    [-c <CATEGORY> [-c <CATEGORY>] ...]
    [-e|--es <EXTRA_KEY> <EXTRA_STRING_VALUE> ...]
    [--esn <EXTRA_KEY> ...]
    [--ez <EXTRA_KEY> <EXTRA_BOOLEAN_VALUE> ...]
    [--ei <EXTRA_KEY> <EXTRA_INT_VALUE> ...]
    [--el <EXTRA_KEY> <EXTRA_LONG_VALUE> ...]
    [--ef <EXTRA_KEY> <EXTRA_FLOAT_VALUE> ...]
    [--eu <EXTRA_KEY> <EXTRA_URI_VALUE> ...]
    [--ecn <EXTRA_KEY> <EXTRA_COMPONENT_NAME_VALUE>]
    [--eia <EXTRA_KEY> <EXTRA_INT_VALUE>[,<EXTRA_INT_VALUE...]]
        (mutiple extras passed as Integer[])
    [--eial <EXTRA_KEY> <EXTRA_INT_VALUE>[,<EXTRA_INT_VALUE...]]
        (mutiple extras passed as List<Integer>)
    [--ela <EXTRA_KEY> <EXTRA_LONG_VALUE>[,<EXTRA_LONG_VALUE...]]
        (mutiple extras passed as Long[])
    [--elal <EXTRA_KEY> <EXTRA_LONG_VALUE>[,<EXTRA_LONG_VALUE...]]
        (mutiple extras passed as List<Long>)
    [--efa <EXTRA_KEY> <EXTRA_FLOAT_VALUE>[,<EXTRA_FLOAT_VALUE...]]
        (mutiple extras passed as Float[])
    [--efal <EXTRA_KEY> <EXTRA_FLOAT_VALUE>[,<EXTRA_FLOAT_VALUE...]]
        (mutiple extras passed as List<Float>)
    [--esa <EXTRA_KEY> <EXTRA_STRING_VALUE>[,<EXTRA_STRING_VALUE...]]
        (mutiple extras passed as String[]; to embed a comma into a string,
         escape it using "\,")
    [--esal <EXTRA_KEY> <EXTRA_STRING_VALUE>[,<EXTRA_STRING_VALUE...]]
        (mutiple extras passed as List<String>; to embed a comma into a string,
         escape it using "\,")
    [-f <FLAG>]
    [--grant-read-uri-permission] [--grant-write-uri-permission]
    [--grant-persistable-uri-permission] [--grant-prefix-uri-permission]
    [--debug-log-resolution] [--exclude-stopped-packages]
    [--include-stopped-packages]
    [--activity-brought-to-front] [--activity-clear-top]
    [--activity-clear-when-task-reset] [--activity-exclude-from-recents]
    [--activity-launched-from-history] [--activity-multiple-task]
    [--activity-no-animation] [--activity-no-history]
    [--activity-no-user-action] [--activity-previous-is-top]
    [--activity-reorder-to-front] [--activity-reset-task-if-needed]
    [--activity-single-top] [--activity-clear-task]
    [--activity-task-on-home]
    [--receiver-registered-only] [--receiver-replace-pending]
    [--receiver-foreground] [--receiver-no-abort]
    [--receiver-include-background]
    [--selector]
    [<URI> | <PACKAGE> | <COMPONENT>]

Error: Unknown option: --display

/system/bin/am start -n org.mozilla.fennec_fdroid/.App --display 3

Output:

Starting: Intent { cmp=org.mozilla.fennec_fdroid/.App }

Exception occurred while executing 'start':
java.lang.SecurityException: Permission Denial: package=com.android.shell does not belong to uid=10190
	at com.android.server.wm.ActivityTaskManagerService.assertPackageMatchesCallingUid(ActivityTaskManagerService.java:2431)
	at com.android.server.wm.ActivityTaskManagerService.startActivityAsUser(ActivityTaskManagerService.java:1299)
	at com.android.server.wm.ActivityTaskManagerService.startActivityAsUser(ActivityTaskManagerService.java:1280)
	at com.android.server.am.ActivityManagerService.startActivityAsUserWithFeature(ActivityManagerService.java:3307)
	at com.android.server.am.ActivityManagerShellCommand.runStartActivity(ActivityManagerShellCommand.java:880)
	at com.android.server.am.ActivityManagerShellCommand.onCommand(ActivityManagerShellCommand.java:261)
	at com.android.modules.utils.BasicShellCommandHandler.exec(BasicShellCommandHandler.java:97)
	at android.os.ShellCommand.exec(ShellCommand.java:38)
	at com.android.server.am.ActivityManagerService.onShellCommand(ActivityManagerService.java:10480)
	at android.os.Binder.shellCommand(Binder.java:1183)
	at android.os.Binder.onTransact(Binder.java:961)
	at android.app.IActivityManager$Stub.onTransact(IActivityManager.java:5877)
	at com.android.server.am.ActivityManagerService.onTransact(ActivityManagerService.java:2768)
	at android.os.Binder.execTransactInternal(Binder.java:1478)
	at android.os.Binder.execTransact(Binder.java:1418)

do not work.

Personal notes: Benjamin_Loison/Voice_assistant/commit/00deff0093e3b964be69f2190115d2dd94359ae2#diff-5031d0ea937a7fcbe0a14f778442700216efff7a

[hanslub42]

Thank you!

Using adb I don't get the "Unknown option" message anymore, but the apps still open on display #0. (it may be my setup: Android 15 and a not quite up-to-date Samsung One UI). Moreover, after starting apps this way the phone UI sometimes freezes. I guess this one needs a bit more time....

[hanslub42]

it may be my setup: Android 15 and a not quite up-to-date Samsung One UI

After upgrading my phone to Android 16 and One UI 8 the whole experience did improve (no more freezes), but the original problem (apps opening on display 0 instead of the display termux is running on) persists.

[Benjamin-Loison]

@hanslub42 What Samsung device do you use? Can you try an open-source OS like LineageOS?

[hanslub42]

I have a S23 Ultra. I'd rather not mess with my existing setup, The Lineage OS website says about the S23 Ultra:

Important: An official method of unlocking the bootloader is not available, but there may be some unofficial methods available. Unofficial methods are not recommended or supported by LineageOS, so use them at your own risk! An unlocked bootloader is required to install LineageOS.

Sorry! But If the problem doesn't show up on other phones/OSes that would point to a Samsung-specific problem (probably the OS rather than the hardware). I can live with that, as termux, am and scrcpy work flawlessly together without the --new-display parameter.

[agnostic-apollo]

am (and even termux-am) provided by termux does not currently support --display option. /system/bin/am cannot be executed from termux, that's why termux provides its own implementation.

• https://github.com/termux/TermuxAm/blob/96c9b040ac10b9560ed80e75036e788903c795c4/app/src/main/java/com/termux/termuxam/Am.java#L809
• https://github.com/termux/termux-am-library/blob/ba77d8778d4c419f48db7ed3cae0e1be08773d5a/termux-am-library/src/main/java/com/termux/am/Am.java#L218
• https://cs.android.com/android/platform/superproject/+/android-16.0.0_r1:frameworks/base/services/core/java/com/android/server/am/ActivityManagerShellCommand.java;l=814

I could add support for it, but I am not fully sure if it would work considering setLaunchDisplayId has restrictions and is not already working when executed with adb. Check adb logcat -d > logcat.txt output for errors when after launching second app on the new display with adb to see potential issues. You can probably also try scrcpy --new-display=1000x1000 --start-app=com.termux and then scrcpy --display-id=<id> --start-app=no.nrk.yr to see if that works, where <id> is the display id in which termux was started in the first command by scrcpy.

• https://developer.android.com/reference/android/app/ActivityOptions#setLaunchDisplayId(int)
• https://developer.android.com/reference/android/app/ActivityManager#isActivityStartAllowedOnDisplay(android.content.Context,%20int,%20android.content.Intent)

scrcpy at least marks the display as public.

• https://github.com/Genymobile/scrcpy/blob/2322868e9e256eb5fce0b3d659ab2a409f29bae1/server/src/main/java/com/genymobile/scrcpy/video/NewDisplayCapture.java#L213
• https://github.com/Genymobile/scrcpy/blob/2322868e9e256eb5fce0b3d659ab2a409f29bae1/server/src/main/java/com/genymobile/scrcpy/device/Device.java#L298

[Benjamin-Loison]

While @hanslub42 is concerned, just for reference on my setup where it works fine:

You can probably also try scrcpy --display-id=3 --start-app=no.nrk.yr to see if that works.

scrcpy --display-id=2 --start-app=org.mozilla.fennec_fdroid

Output:

scrcpy 3.3.4 <https://github.com/Genymobile/scrcpy>
INFO: ADB device found:
INFO:     -->   (usb)  XXXXXXXX                        device  FP4
/home/benjamin_loison/Desktop/bens_folder/softwares/scrcpy/scrcpy-linux-x86_64-v3.3.4/scrcpy-server: 1 file pushed, 0 skipped. 113.4 MB/s (90980 bytes in 0.001s)
[server] INFO: Device: [Fairphone] Fairphone FP4 (Android 16)
INFO: Renderer: opengl
INFO: OpenGL version: 4.6 (Compatibility Profile) Mesa 25.2.8-0ubuntu0.24.04.1
INFO: Trilinear filtering enabled
[server] WARN: Display doesn't have FLAG_SUPPORTS_PROTECTED_BUFFERS flag, mirroring can be restricted
INFO: Texture: 1080x2336
[server] INFO: Starting app "Fennec" [org.mozilla.fennec_fdroid] on display 2...

works fine, but hangs. scrcpy arguments seems to not prevent hanging, despite they allow not screen sharing again.

@agnostic-apollo:

I am also interested in being able to start an app on another display from Termux without ADB. As I mentioned in #issuecomment-4545812480, adb shell am start org.mozilla.fennec_fdroid/.App --display 3 works fine on my end, hence is not already working when executed with adb does not apply to my need at least.

Personal notes:

DuckDuckGo and Google search Make scrcpy not hang and Make scrcpy not hang start-app.

https://chat.mistral.ai/chat/a524f6b2-fdd8-488a-838a-70f259c60181

https://chatgpt.com/share/6a1ab982-a450-83eb-86b8-6d02bdd80857

scrcpy --display-id=3 --start-app=org.mozilla.fennec_fdroid --no-audio --no-control

Output:

scrcpy 3.3.4 <https://github.com/Genymobile/scrcpy>
ERROR: Cannot start an Android app if control is disabled

scrcpy --display-id=5 --start-app=org.mozilla.fennec_fdroid --no-playback

Output:

scrcpy 3.3.4 <https://github.com/Genymobile/scrcpy>
INFO: No video playback, no recording, no V4L2 sink: video disabled
INFO: No audio playback, no recording: audio disabled
INFO: No video mirroring, SDK mouse disabled
INFO: ADB device found:
INFO:     -->   (usb)  XXXXXXXX                        device  FP4
/home/benjamin_loison/Desktop/bens_folder/softwares/scrcpy/scrcpy-linux-x86_64-v3.3.4/scrcpy-server: 1 file pushed, 0 skipped. 92.1 MB/s (90980 bytes in 0.001s)
[server] INFO: Device: [Fairphone] Fairphone FP4 (Android 16)
INFO: Renderer: opengl
INFO: OpenGL version: 4.6 (Compatibility Profile) Mesa 25.2.8-0ubuntu0.24.04.1
INFO: Trilinear filtering disabled
[server] INFO: Starting app "Fennec" [org.mozilla.fennec_fdroid] on display 5...

does not help too.

This feature would make people able to create a new display with scrcpy for instance and make Termux use it, without having to provide adb access to Termux.

grep -ri library TermuxAm/

Output:

TermuxAm/am-apk-installed:unset LD_LIBRARY_PATH LD_PRELOAD
TermuxAm/am-libexec-packaged:unset LD_LIBRARY_PATH LD_PRELOAD

grep -ri 'library' termux-app/ --exclude-dir={build,.github,.gradle,.git} --exclude={logs.txt,LICENSE.md,bootstrap-*.zip}

Output:

termux-app/app/build.gradle:        coreLibraryDesugaringEnabled true
termux-app/app/build.gradle:    coreLibraryDesugaring "com.android.tools:desugar_jdk_libs:1.1.5"
termux-app/app/src/main/cpp/Android.mk:include $(BUILD_SHARED_LIBRARY)
termux-app/app/src/main/java/com/termux/app/TermuxInstaller.java: * (4) The zip file is loaded from a shared library.
termux-app/app/src/main/java/com/termux/app/TermuxInstaller.java:        // Only load the shared library when necessary to save memory usage.
termux-app/app/src/main/java/com/termux/app/TermuxInstaller.java:        System.loadLibrary("termux-bootstrap");
termux-app/terminal-view/build.gradle:apply plugin: 'com.android.library'
termux-app/termux-shared/build.gradle:apply plugin: 'com.android.library'
termux-app/termux-shared/build.gradle:        implementation "com.termux:termux-am-library:v2.0.0"
termux-app/termux-shared/build.gradle:        coreLibraryDesugaringEnabled true
termux-app/termux-shared/build.gradle:    coreLibraryDesugaring "com.android.tools:desugar_jdk_libs:1.1.5"
termux-app/termux-shared/src/main/cpp/Android.mk:include $(BUILD_SHARED_LIBRARY)
termux-app/termux-shared/src/main/java/com/termux/shared/shell/command/environment/UnixShellEnvironment.java:    public static final String ENV_LD_LIBRARY_PATH = "LD_LIBRARY_PATH";
termux-app/termux-shared/src/main/java/com/termux/shared/shell/am/AmSocketServer.java: * and runs them with termux-am-library. It would normally only allow processes belonging to the
termux-app/termux-shared/src/main/java/com/termux/shared/shell/am/AmSocketServer.java: * https://github.com/termux/termux-am-library/blob/main/termux-am-library/src/main/java/com/termux/am/Am.java
termux-app/termux-shared/src/main/java/com/termux/shared/shell/am/AmSocketServer.java:     * Call termux-am-library to run the am command.
termux-app/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java:                environment.put(ENV_LD_LIBRARY_PATH, TermuxConstants.TERMUX_LIB_PREFIX_DIR_PATH);
termux-app/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java:                // Termux binaries on Android 7+ rely on DT_RUNPATH, so LD_LIBRARY_PATH should be unset by default
termux-app/termux-shared/src/main/java/com/termux/shared/termux/shell/command/environment/TermuxShellEnvironment.java:                environment.remove(ENV_LD_LIBRARY_PATH);
termux-app/termux-shared/src/main/java/com/termux/shared/termux/shell/TermuxShellUtils.java:        //   system /system/bin/sh. The system shell may vary and may not work at all due to LD_LIBRARY_PATH.
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketErrno.java:    public static final Errno ERRNO_START_LOCAL_SOCKET_LIB_LOAD_FAILED_WITH_EXCEPTION = new Errno(TYPE, 100, "Failed to load \"%1$s\" library.\nException: %2$s");
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:    /** The native JNI local socket library. */
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:    protected static String LOCAL_SOCKET_LIBRARY = "local-socket";
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:    /** Whether {@link #LOCAL_SOCKET_LIBRARY} has been loaded or not. */
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:    protected static boolean localSocketLibraryLoaded;
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:        if (!localSocketLibraryLoaded) {
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:                Logger.logDebug(LOG_TAG, "Loading \"" + LOCAL_SOCKET_LIBRARY + "\" library");
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:                System.loadLibrary(LOCAL_SOCKET_LIBRARY);
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:                localSocketLibraryLoaded = true;
termux-app/termux-shared/src/main/java/com/termux/shared/net/socket/local/LocalSocketManager.java:                Error error = LocalSocketErrno.ERRNO_START_LOCAL_SOCKET_LIB_LOAD_FAILED_WITH_EXCEPTION.getError(t, LOCAL_SOCKET_LIBRARY,  t.getMessage());
termux-app/termux-shared/src/main/java/com/termux/shared/jni/models/JniResult.java:     * The errno value for any failed native system or library calls if {@link #retval} does not equal 0.
termux-app/termux-shared/src/main/java/com/termux/shared/models/TextIOInfo.java:     * app is compiled, even if its kept during library compilation.
termux-app/termux-shared/src/main/java/com/termux/shared/models/ReportInfo.java:     * app is compiled, even if its kept during library compilation.
termux-app/terminal-emulator/build.gradle:apply plugin: 'com.android.library'
termux-app/terminal-emulator/src/main/jni/Android.mk:include $(BUILD_SHARED_LIBRARY)
termux-app/terminal-emulator/src/main/java/com/termux/terminal/JNI.java:        System.loadLibrary("termux");
termux-app/terminal-emulator/src/test/java/com/termux/terminal/TerminalTest.java:	/** The ncurses library still uses this. */
termux-app/README.md:[![Termux library releases at Jitpack](https://jitpack.io/v/termux/termux-app.svg)](https://jitpack.io/#termux/termux-app)
termux-app/README.md:The [termux-shared](termux-shared) library was added in [`v0.109`](https://github.com/termux/termux-app/releases/tag/v0.109). It defines shared constants and utils of the Termux app and its plugins. It was created to allow for the removal of all hardcoded paths in the Termux app. Some of the termux plugins are using this as well and rest will in future. If you are contributing code that is using a constant or a util that may be shared, then define it in `termux-shared` library if it currently doesn't exist and reference it from there. Update the relevant changelogs as well. Pull requests using hardcoded values **will/should not** be accepted. Termux app and plugin specific classes must be added under `com.termux.shared.termux` package and general classes outside it. The [`termux-shared` `LICENSE`](termux-shared/LICENSE.md) must also be checked and updated if necessary when contributing code. The licenses of any external library or code must be honoured.
termux-app/README.md:- Currently, not all plugins use `TermuxConstants` from `termux-shared` library and have hardcoded `com.termux` values and will need to be manually patched.

grep -ri 'am.*library' termux-app/ --exclude-dir={build,.github,.gradle,.git} --exclude={logs.txt,LICENSE.md,bootstrap-*.zip}

Output:

termux-app/termux-shared/build.gradle:        implementation "com.termux:termux-am-library:v2.0.0"
termux-app/termux-shared/src/main/java/com/termux/shared/shell/am/AmSocketServer.java: * and runs them with termux-am-library. It would normally only allow processes belonging to the
termux-app/termux-shared/src/main/java/com/termux/shared/shell/am/AmSocketServer.java: * https://github.com/termux/termux-am-library/blob/main/termux-am-library/src/main/java/com/termux/am/Am.java
termux-app/termux-shared/src/main/java/com/termux/shared/shell/am/AmSocketServer.java:     * Call termux-am-library to run the am command.

I checked these occurrences.

A virtual machine, taking into account my own termux-am-library, would be a good start.

[agnostic-apollo]

adb shell am start org.mozilla.fennec_fdroid/.App --display 3 works fine on my end, hence is not already working when executed with adb does not apply to my need at least.

If its hanging, I wouldn't assume its working to actually be usable currently.

Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=org.mozilla.fennec_fdroid/.App }

Your log also doesn't state it started app in display 3, not sure how Android indicates that. The command itself works for OP too but starts in display 0 even when 3 is passed. Is it actually display 3 for your setup.

How did you even set up display 3 in the first place?

[Benjamin-Loison]

@agnostic-apollo

If its hanging, I wouldn't assume its working to actually be usable currently.

Your phrasing its working to actually be usable currently is unclear to me.

Hanging is normal as scrcpy stands for screen copy, so it expects a continuous stream, not a single action (open app on given display), the single action is just a continuous stream context initialization somehow.

Is it actually display 3 for your setup.

Yes:

adb shell am start org.mozilla.fennec_fdroid/.App --display 3

opens org.mozilla.fennec_fdroid/.App on the virtual display 3 on my LineageOS 23.2.

How did you even set up display 3 in the first place?

I keep:

scrcpy --new-display

hanging first in parallel of afterwards running adb shell am start org.mozilla.fennec_fdroid/.App --display 3.