Codecov Report

Merging #369 into master will decrease coverage by 0.17%.
The diff coverage is 65%.

@@             Coverage Diff              @@
##             master     #369      +/-   ##
============================================
- Coverage     82.93%   82.76%   -0.18%     
  Complexity      456      456              
============================================
  Files            41       41              
  Lines          2233     2251      +18     
  Branches        217      220       +3     
============================================
+ Hits           1852     1863      +11     
- Misses          298      302       +4     
- Partials         83       86       +3

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If you can separate the commits so that the firefox custom tab definitions can be pulled in separately from the rest, I can merge that piece at least. The default browser behavior needs some more discussion and investigation.

The ordered list is always returning Chrome as the first entry, no matter what...
This is an example, of a phone with Android 8.0, where Firefox is set as the default browser: 07-14 22:15:15.714 12422-12909/? D/BrowserSelector: resolvedActivityList: [ResolveInfo{3be23c com.android.chrome/com.google.android.apps.chrome.Main m=0x108000}, ResolveInfo{ed5cbc5 org.mozilla.firefox/.App m=0x108000}]
I do not know what their criteria is for the order, but it is not returning the default browser first.
The same is also shown on Android 7.0.

it could be changed if the flag used by queryIntentActivities was changed.

I have tried to look more into it.
The problem is that the PackageManager.MATCH_ALL flag is making the result unsorted.
https://developer.android.com/reference/android/content/pm/PackageManager#MATCH_ALL
But the problem is that removing MATCH_ALL, will make queryIntentActivities only return the default browser on Android >= 7.0.

Looking at the code generating the list returned by queryIntentActivities:
https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/pm/PackageManagerService.java#7801
That is using the list generated as "an unsorted list":
https://android.googlesource.com/platform/frameworks/base.git/+/master/services/core/java/com/android/server/pm/PackageManagerService.java#7731
That is why there is a need to get the package name of the default browser and the list using MATCH_ALL is needed, in case the default browser is not compatible with Custom Tabs.

OK, thanks for investigating further. Could you still separate this change into two pull requests, one for adding the additional constants related to Firefox, and the other for the default browser selection?

Have made a new pull request only including the Firefox support.
Better to separate the two issues, as stated by iainmcgin
#378

Have created a new pull request regarding using the default browser, if it is compatible.
#379