根据文件类型的应用程序选择对话框
我试图创建一个对话框，将显示菱应用程序的列表，打开特定文件类型。
I'm trying to create a Dialog, which will display a list of availible applications to open a given filetype.
我一直期待在这里计算器具有相同问题工作的一些问题，但我迷路由于缺少答案。特别是我一直在寻找这样一个问题：
I've been looking at some question here on stackoverflow that work with the same issue, but I get lost due to lacking answer. In particular I've been looking at this question:
In Android的，我怎么能显示基于文件类型的应用程序选择？
我的跟进问题是，那么：
My follow-up question is then:
- 做什么用的
列表与LT; ResolveInfo＆GT; - 如何显示与名称和图标的应用菱？
- 当用户选择一个应用程序，我怎么能启动它根据所选项目的ResolveInfo？
我发现了一个解决方案，即给我的，可以打开一个给定的MIME类型的应用程序的完整列表。这是不是最好的，因为我想名单更具体，只是几个应用程序（例如，如果这是我想打开浏览器仅会显示了一个URL），但供应的目的。
I found a solution, that gives me a full list of applications that can open a given mimetype. It's not the best, as I would like the list to be more specific and just a few applications (e.g. if it was an URL I wanted to open only browsers would show up) but serves the purpose.
下面是我做过什么：
File file = new File( "myFileLocation.txt" );
String extension = MimeTypeMap.getFileExtensionFromUrl( file.getPath() );
String type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
Intent intent = new Intent();
intent.setAction( Intent.ACTION_VIEW );
intent.setDataAndType( Uri.fromFile( file ), type );
context.startActivity( intent );