android - mobile app dev - how to create crossplatform app with automatic file download with access to mobile file system? (sample code?)

Question

I need to create some kind of automatic file downloader (for a specific website - over HTTP or HTTPS) which is able to place the downloaded files in a directory on the mobile which can accessed e.g. bei media players (to play mp3 files) or other software (e.g. to open pdf files). In other words: Which have "file-system-access" on the mobile.

It should be crossplattform, so I should be able to create a native app (and distribute it via the respective app-stores) of (must-have) Android, iOS, Windows Phone and (nice-to-have) the "other" plattforms like blackberry and so on.

It would be great if someone could post some lines of sample-code or link to small sample apps.

PS: It would be nice if the SMS-inbox could be read, but that's (nice-to-have), too.

Answer 1

您将无法跨平台执行此操作。

Win Phone、Android 和 iOS 是完全不同的操作系统。

您将需要 3 种不同的软件工具来开发您的应用程序（Visual Studio 和其他 2 种），并且您将必须拥有并维护 3 种不同的安装。