public void ExportToFile(BookPageModel bookPageModel, string filepath) { var path = System.IO.Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, LocalDataHelper.Context.PackageName, "audio.mp3"); Java.IO.File f = new Java.IO.File(path); var result = tts.SynthesizeToFile("你好呀", null, f, ""); }