WRT addDataType(string) I've only used it with mime types so I'll let
someone else comment on the best practice here.
As far as the mime based filter, the more specific filter should start fire
first. If you have specified your app as default, for the correct action
and for your specific mime type it should launch with no competition from
other apps (no chooser dialog).
Were you specifying the filter in the manifest or at run time?
Here's an example mime based filter to be specified under the activity in
your manifest:
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:mimeType="text/x-my-app-mime" />
</intent-filter>
I use this type of filter in a few different apps and have yet to have any
issues with my app(s) not starting when the tags are read or presenting the
chooser dialog.
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