Monitoring Visibility Changes of Other Applications in Tizen

Problem Understanding

The user wants to monitor visibility changes of all applications running on a Tizen device, particularly when applications become visible to the user (foreground state). This requires a mechanism to receive callbacks with application IDs when other apps' visibility states change.

Solution Methods

1. Application State Monitoring:

   • While Tizen doesn't provide direct callbacks for other apps' visibility changes, you can monitor application state changes using the Application Manager API.
   • The available states are: READY, CREATED, RUNNING, PAUSED, and TERMINATED.
   • Note that service applications don't have a PAUSED state since they lack UI.

2. Task Manager Sample Application:

   • Review the Task Manager sample app that demonstrates how to track running applications.
   • This sample shows how to get application IDs and monitor their states.
   • Location: New Project → Sample → Mobile → Native Application → AppFw → Taskmanager

Code Examples

// Example of setting up application state change callback
void app_state_changed(app_control_h app_control, app_state_changed_e state, void *user_data) {
    char *app_id = NULL;
    app_control_get_app_id(app_control, &app_id);
    
    if (state == APP_STATE_RUNNING) {
        dlog_print(DLOG_INFO, "APP_STATE", "App %s is now visible", app_id);
    }
    // Handle other states as needed
}

// Register the callback
app_manager_set_app_state_changed_cb(app_state_changed, NULL);

Additional Tips

• The Task Manager sample provides practical implementation details for tracking application states.
• Be aware of privacy and security restrictions when monitoring other applications.
• For service applications, focus on the RUNNING state as they don't have UI-related states.