Tizen Developers

Hello,

You may follow the process below to implement this.

Step 1: At first, create two different apps i.e. one UI app (which will remain on top at screen on state) and one service app (which will detect the screen state whether it's on/off within a certain time interval and launch the UI app).

Step 2 : The tasks of service app described in Step 1 can be done by using Ecore Timer and App Control. In the service_app_create function of the service app write the code below:

ecore_timer_add(5, get_device_screen_state, NULL);

Here, I'm checking the state of screen within 5 sec interval, you may change the value according to your requirement. The get_device_screen_state function can be written as below:

Eina_Bool get_device_screen_state(void *data EINA_UNUSED) {
    display_state_e state;

	if(device_display_get_state(&state) == DEVICE_ERROR_NONE) {
		switch(state) {
		case DISPLAY_STATE_NORMAL:
			launchUIapp(); // function to make the UI app visible to user
			break;
		case DISPLAY_STATE_SCREEN_DIM:
			break;
		case DISPLAY_STATE_SCREEN_OFF:
			break;
		}
	} else {
		// error handling
	}
	return EINA_TRUE;
}

After that write function as below:

static void launchUIapp()
{
    app_control_h app_control = NULL;
	app_control_create(&app_control);
	app_control_set_app_id(app_control, "GIVE_THE_UI_APP_ID");

	if(app_control_send_launch_request(app_control, NULL, NULL) == APP_CONTROL_ERROR_NONE)
	{
		// app launched successfully
	}

	app_control_destroy(app_control);
}

NOTE: Don't forget to add the following previleges in the manifest file of the service app:

<privilege>http://tizen.org/privilege/appmanager.launch</privilege>
<privilege>http://tizen.org/privilege/display</privilege>

Headers need to be included in the service app:

#include <device/display.h>
#include <device/callback.h>
#include <Ecore.h>

Ref. Links:

https://developer.tizen.org/dev-guide/native/2.3.0/org.tizen.mobile.native.apireference/group__Ecore__Timer__Group.html#ga7b9cb9d24ecebfdbb957436e2e669402

https://developer.tizen.org/zh-hans/community/code-snippet/native-code-snippet/get-device-screen-state?langredirect=1

https://developer.tizen.org/development/api-guides/native-application/application-framework/application/app-control

Thanks so much for your solution.

I think there is an other simple solution (example: use library) instead of implement logic flows.

Anyway, your solution is also good. Thanks one more times.

Sorry, I just think about that but I have not yet.