Why isn’t my app on the list of apps to open txt file?

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You need to associate your app with file extension. To do so, add these two line within intent filter and u’r good to go

<data android:scheme="file" />
<data android:mimeType="*/*"/>
<data android:pathPattern=".*\\.pdf" />

And your manifest would be look like this

<activity name="com.your.activity">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.intent.category.DEFAULT" />
        <category android:name="android.intent.category.BROWSABLE" />
        <data android:scheme="file" />
        <data android:mimeType="*/*" />
        <data android:pathPattern=".*\\.txt" />
    </intent-filter>
</activity>

<data android:scheme="file" /> => this define that the file must be local, not from http or else

<data android:mimeType="*/*" /> => match any mime type

<data android:pathPattern=".*\\.txt" /> => this is where you specify what extension you want to match

Hope this help

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