Android How to create Intent Filter for custom file extension that does NOT make it part of a chooser for everything on the phone

The only way to solve this problem is add scheme and host attributes to your intent filter:

  <action android:name="android.intent.action.VIEW" />
  <category android:name="android.intent.category.DEFAULT" />
  <data android:scheme="file" />
  <data android:mimeType="*/*" />
  <data android:pathPattern=".*\.tgtp" />   
  <data android:host="*" />

That is because in documentation says that android:pathPattern only works if has an scheme and host defined.

Hope it helps.

I’ve been struggling with this quite a bit for a custom file extension, myself. After a lot of searching, I found this web page where the poster discovered that Android’s patternMatcher class (which is used for the pathPattern matching in Intent-Filters) has unexpected behavior when your path contains the first character of your match pattern elsewhere in the path (like if you’re trying to match “*.xyz”, the patternMatcher class stops if there’s an “x” earlier in your path). Here’s what he found for a workaround, and worked for me, although it is a bit of a hack:

PatternMatcher is used for pathPattern at IntentFilter But,
PatternMatcher’s algorithm is quite strange to me. Here is algorithm
of Android PatternMatcher.

If there is ‘next character’ of ‘.*’ pattern in the middle of string,
PatternMatcher stops loop at that point. (See of
Android framework.)

Ex. string : “this is a my attachment” pattern : “.att.“. Android
PatternMatcher enter loop to match ‘.‘ pattern until meet the next
character of pattern (at this example, ‘a’) So, ‘.
‘ matching loop
stops at index 8 – ‘a’ between ‘is’ and ‘my’. Therefore result of this
match returns ‘false’.

Quite strange, isn’t it. To workaround this – actually reduce
possibility – developer should use annoying stupid pathPattern.

Ex. Goal : Matching uri path which includes ‘message’.

<data android:pathPattern=".*message.*" />
<data android:pathPattern=".*m.*message.*" />
<data android:pathPattern=".*m.*m.*message.*" />
<data android:pathPattern=".*m.*m.*m.*message.*" />
<data android:pathPattern=".*m.*m.*m.*m.*message.*" />

This is especially issued when matching with custom file extention.

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