Permission to display pop-up windows while running in the background

Question

I have a project that needs to display pop-up windows while running in the background permission. How to ask the user permission. I already tried the Setting.canDrawOverlay() but it doesn't work for the app that killed.

this is my app permission in setting

I only can get the green one permission but I need the red one.

Thanks.

Answer 1

This permission has to be given manually, but after searching for some time I came up with an idea that can be used to open the correct permission screen, so the user can activate the permission.

    fun isMiUi(): Boolean {
        return getSystemProperty("ro.miui.ui.version.name")?.isNotBlank() == true
    }

    fun isMiuiWithApi28OrMore(): Boolean {
        return isMiUi() && Build.VERSION.SDK_INT >= 28
    }

    fun goToXiaomiPermissions(context: Context) {
        val intent = Intent("miui.intent.action.APP_PERM_EDITOR")
        intent.setClassName("com.miui.securitycenter", "com.miui.permcenter.permissions.PermissionsEditorActivity")
        intent.putExtra("extra_pkgname", context.packageName)
        context.startActivity(intent)
    }

    private fun getSystemProperty(propName: String): String? {
        val line: String
        var input: BufferedReader? = null
        try {
            val p = Runtime.getRuntime().exec("getprop $propName")
            input = BufferedReader(InputStreamReader(p.inputStream), 1024)
            line = input.readLine()
            input.close()
        } catch (ex: IOException) {
            return null
        } finally {
            if (input != null) {
                try {
                    input.close()
                } catch (e: IOException) {
                    e.printStackTrace()
                }
            }
        }
        return line
    }

In my project I verify if isMiuiWithApi28OrMore() and if it is then I can prepare an additional step telling the user that the app needs the permission and sends him to the permission screen.

I hope it helps.