android - Creating app which opens a custom file extension

Question

Want to create an android application, which opens a custom-build file extension (for example, I want to open .abcd files)

It is something like Adobe Reader that opens .pdf files, or Photo Viewer that opens .jpg files

Specific conditions:
1. The .abcd file should be outside / external from the application itself. (as .pdf is to Adobe Reader)
2. The .abcd file would be a zipped file, which contains few folders and .xml, .txt, and .jpg files. I think I want to extract it - maybe temporarily - to somewhere in the storage (definitely need a zipper/unzipper library), then read the individual .xml, .txt, and .jpg files.

Looking for insights and answers for this problem.

Additional information:
I am relatively new to Android programming.

Answer 1

I think you need to do that type of customization via intent-filter something like:

<intent-filter android:icon="your_drawable-resource"
               android:label="your_string_resource"
               android:priority="integer"> 
    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:scheme="file" />
    <data android:host="*" />
    <data android:pathPattern=".*\.YOUR_CUSTOM_FILE_EXTENSION" />
</intent-filter>

Also you should look:

• Custom Filetype in Android not working
• Android intent filter for a particular file extension?
• android intent filter for custom file extension