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Android app tight integration with the assistant
What are Slices?

Slices examples

Implementation
Declaring the Slice in Shortcuts.xml
<capability android:name="actions.intent.OPEN_APP_FEATURE">
    <slice>
        <url-template
            android:name="content://com.example.android.app.provider/slice{?feature}" />

    </slice>
</capability>
Creating the SliceProvider
  • onBindSlice(), it takes a Uri, and what you need to do is map this Uri with your slice and return the Slice
  • onCreateSliceProvider(), you can do preliminary tasks, but something light, do not block the thread, and return true.
  • last but not least, you can show the Slice Authority, this is a unique name that will allow the system to trigger the Slice, see Grant Permission below.
class MySliceProvider : SliceProvider() {
    companion object {
        const val SLICE_AUTHORITY = "com.example.android.app.provider"
    }
    override fun onBindSlice(sliceUri: Uri?): Slice? {
        // you can filter the sliceUri here to provide the appropriate slice
        return createSlice()
    }
    override fun onCreateSliceProvider(): Boolean = true
}

 

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Declare SliceProvider in AndroidManifest
<application>
...
<provider android:name="MySliceProvider"
    android:authorities="com.example.android.app.provider"
    android:exported="true" >
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <category android:name="android.app.slice.category.SLICE" />
    </intent-filter>
</provider>
Grant Slice permissions
private fun grantAssistantPermissions() {
    getAssistantPackage()?.let { assistantPackage ->
        val sliceProviderUri = Uri.Builder()
            .scheme(ContentResolver.SCHEME_CONTENT)
            .authority(MySliceProvider.SLICE_AUTHORITY)
            .build()

        SliceManager.getInstance(this).grantSlicePermission(assistantPackage, sliceProviderUri)
    }
}
Creating a Slice
// SliceProvider
fun createSlice() {
    return list(...) {
        header {
            title = "My title"
            subtitle = "Subtitle"
            // Defines the primary action when slice is clicked
            primaryAction = SliceAction.create(...)
        }
        row { ... }
    }
}
Previewing with SliceViewer

Releases · android/user-interface-samples

adb install -r -t slice-viewer.apk

You can now execute the following command to start SliceViewer. Notice how the keyword slice has been prefixed to content.

adb shell am start -a android.intent.action.VIEW -d 
slice-content://com.example.android.app.provider/slice

example of slice viewer

Conclusion
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