android 根据文件的扩展名选择用什么应用程序打开

private void openFile(File f) { Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(android.content.Intent.ACTION_VIEW); String type = getMIMEType(f); intent.setDataAndType(Uri.fromFile(f), type); startActivity(intent); } private String getMIMEType(File f){ String end = f .getName() .substring(f.getName().lastIndexOf(".") + 1, f.getName().length()).toLowerCase(); String type = ""; if (end.equals("mp3") || end.equals("aac") || end.equals("aac") || end.equals("amr") || end.equals("mpeg") || end.equals("mp4")) { type = "audio"; } else if (end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg")) { type = "image"; } else { type = "*"; } type += "/*"; return type; }