道歉，如果这已经回答了 - 如果有人可以点我到一个已经回答了问题，那将是巨大的......

Apologies if this has already been answered - if someone can point me to an already-answered question, that would be great...

其实很简单，我希望能够弹出的能够处理特定类型的文件的应用程序列表 - 例如，如果我有一个音乐文件（MP3，OGG，等等），我想到能够显示的所有加载的媒体应用程序可以处理该文件，并允许用户在列表中选择一个。

Very simply, I would like to be able to pop up a list of applications which can process a file of a given type - for instance, if I have a music file (mp3, ogg, whatever), I'd like to be able to display a list of all loaded media applications that can process the file and allow the user to select one.

我一直在玩弄创建一个意向要做到这一点，如下所示：

I've been playing around with creating an intent to do this as follows:

Intent myIntent = new Intent();
myIntent.setAction(Intent.ACTION_VIEW);
myIntent.addCategory("android.intent.category.LAUNCHER");
myIntent.setType("mp3");
startActivity(myIntent);

但我显然得到它错了，因为它崩溃每次。我应该使用ACTION_VIEW的ACTION_PICK或ACTION_CHOOSER呢？

but I've obviously gotten it wrong, since it crashes every time. Should I be using ACTION_PICK or ACTION_CHOOSER instead of ACTION_VIEW?

更重要的是，是否有可能通过比Intent.type其他的东西很容易地定义所有的媒体播放器？我认为，类型应该是一个正确的MIME类型，在较低的情况下，但我不知道在这种情况下使用什么...

More importantly, is it possible to easily define all media players by something other than the Intent.type? I believe type should be a proper MIME type, in lower case, but I'm not sure what to use in this instance...

请温柔：）

推荐答案

要获得可以成功地打开一个给定的意图，你将使用PackageManager的应用程序。简单地构造意图如上然后用这个code，以获得可以处理这个意图的应用程序。

To get the applications that can successfully open a given intent you'll use the PackageManager. Simply construct the intent as above and then use this code to get the applications that can handle the intent.

Intent myIntent = new Intent();
myIntent.setAction(Intent.ACTION_VIEW);
myIntent.addCategory("android.intent.category.LAUNCHER");
myIntent.setType("mp3");    

PackageManager manager = getPackageManager();
List<ResolveInfo> info = manager.queryIntentActivities(
    myIntent, PackageManager.MATCH_DEFAULT_ONLY);

这将会给你，可以处理的意图，包括图标，包名程序的所有信息。然后，您可以创建具有这些选项的对话框，并保存用户选择的选项。

This will give you all the information on the programs that can handle the intent, including icon, and packagename. You can then create a dialog box with these options and save the option the user chooses.