Background Services are restricted in Xiaomi and Oppo

Finally I’ve found the answer here

private static final Intent[] POWERMANAGER_INTENTS = {
    new Intent().setComponent(new ComponentName("com.miui.securitycenter", "com.miui.permcenter.autostart.AutoStartManagementActivity")),
    new Intent().setComponent(new ComponentName("com.letv.android.letvsafe", "com.letv.android.letvsafe.AutobootManageActivity")),
    new Intent().setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.startupmgr.ui.StartupNormalAppListActivity")),
    new Intent().setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.optimize.process.ProtectActivity")),
    new Intent().setComponent(new ComponentName("com.huawei.systemmanager", "com.huawei.systemmanager.appcontrol.activity.StartupAppControlActivity")),
    new Intent().setComponent(new ComponentName("com.coloros.safecenter", "com.coloros.safecenter.permission.startup.StartupAppListActivity")),
    new Intent().setComponent(new ComponentName("com.coloros.safecenter", "com.coloros.safecenter.startupapp.StartupAppListActivity")),
    new Intent().setComponent(new ComponentName("com.oppo.safe", "com.oppo.safe.permission.startup.StartupAppListActivity")),
    new Intent().setComponent(new ComponentName("com.iqoo.secure", "com.iqoo.secure.ui.phoneoptimize.AddWhiteListActivity")),
    new Intent().setComponent(new ComponentName("com.iqoo.secure", "com.iqoo.secure.ui.phoneoptimize.BgStartUpManager")),
    new Intent().setComponent(new ComponentName("com.vivo.permissionmanager", "com.vivo.permissionmanager.activity.BgStartUpManagerActivity")),
    new Intent().setComponent(new ComponentName("com.samsung.android.lool", "com.samsung.android.sm.ui.battery.BatteryActivity")),
    new Intent().setComponent(new ComponentName("com.htc.pitroad", "com.htc.pitroad.landingpage.activity.LandingPageActivity")),
    new Intent().setComponent(new ComponentName("com.asus.mobilemanager", "com.asus.mobilemanager.MainActivity"))
};



for (Intent intent : POWERMANAGER_INTENTS)
    if (getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY) != null) {
            // show dialog to ask user action
        break;
}

edit:
Also there is a problem checking if the user enabled auto-start or not.
As I searched, currently there are no solutions available. So I designed a solution myself.
I created a worker which will save system’s time in preferences every 25 min.
Every time the app is opened, I check the preferences, and if it is more than 30 min passed from the saved time, It means that worker could not do the work, so possibly user did not enable auto-start the last time and must prompt again.

class BackgroundCheckWorker(val appContext: Context, val workerParams: WorkerParameters) :
Worker(appContext, workerParams), KoinComponent {


override fun doWork(): Result {
    val pref = appContext.getSharedPreferences(PermissionHandler.AUTO_START_PREF, Context.MODE_PRIVATE)
    val editor = pref.edit()
    editor.putString(AUTO_START_PREF_KEY, Calendar.getInstance().time.toString())
    editor.apply()
    return Result.success()
}
}

And in splash I call this function:

fun requestUnrestrictedBackgroundService(context: Activity): Boolean {
            val pref = context.getSharedPreferences(AUTO_START_PREF, Context.MODE_PRIVATE)
            var updated = false
            val lastUpdate = pref.getString(AUTO_START_PREF_KEY, "")
            updated = if (lastUpdate == null || lastUpdate == "") {
                val editor = pref.edit()
                editor.putString(AUTO_START_PREF_KEY, Calendar.getInstance().time.toString())
                editor.apply()
                false
            } else lastUpdate != "" &&
                    DateUtil.minAgo(lastUpdate) <= 30
            if (!updated) {
                for (intent in POWERMANAGER_INTENTS)
                    if (context.packageManager.resolveActivity(
                            intent,
                            PackageManager.MATCH_DEFAULT_ONLY
                        ) != null
                    ) {
                            val dialog = AlertDialog.Builder(context)
                            dialog.setMessage("On this device you must allow us to run services in background")
                                .setPositiveButton("Yes") { paramDialogInterface, paramInt ->
                                    val editor = pref.edit()
                                    editor.putString(AUTO_START_PREF_KEY, Calendar.getInstance().time.toString())
                                    editor.apply()
                                    context.startActivityForResult(intent, 1234)
                                }
                                .setNegativeButton("Cancel") { paramDialogInterface, paramInt -> context.finish() }
                            dialog.show()
                            return false
                    }
            }
            return true
        }