สร้างรายการใน Wear OS

class MainActivity : Activity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
    ...
}

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    ...
}

wearableRecyclerView.apply {
    // To align the edge children (first and last) with the center of the screen.
    isEdgeItemsCenteringEnabled = true
    ...
    layoutManager = WearableLinearLayoutManager(this@MainActivity)
}

// To align the edge children (first and last) with the center of the screen.
wearableRecyclerView.setEdgeItemsCenteringEnabled(true);
...
wearableRecyclerView.setLayoutManager(
                new WearableLinearLayoutManager(this));

/** How much icons should scale, at most.  */
private const val MAX_ICON_PROGRESS = 0.65f

class CustomScrollingLayoutCallback : WearableLinearLayoutManager.LayoutCallback() {

    private var progressToCenter: Float = 0f

    override fun onLayoutFinished(child: View, parent: RecyclerView) {
        child.apply {
            // Figure out % progress from top to bottom.
            val centerOffset = height.toFloat() / 2.0f / parent.height.toFloat()
            val yRelativeToCenterOffset = y / parent.height + centerOffset

            // Normalize for center.
            progressToCenter = Math.abs(0.5f - yRelativeToCenterOffset)
            // Adjust to the maximum scale.
            progressToCenter = Math.min(progressToCenter, MAX_ICON_PROGRESS)

            scaleX = 1 - progressToCenter
            scaleY = 1 - progressToCenter
        }
    }
}

public class CustomScrollingLayoutCallback extends WearableLinearLayoutManager.LayoutCallback {
    /** How much icons should scale, at most. */
    private static final float MAX_ICON_PROGRESS = 0.65f;

    private float progressToCenter;

    @Override
    public void onLayoutFinished(View child, RecyclerView parent) {

        // Figure out % progress from top to bottom.
        float centerOffset = ((float) child.getHeight() / 2.0f) / (float) parent.getHeight();
        float yRelativeToCenterOffset = (child.getY() / parent.getHeight()) + centerOffset;

        // Normalize for center.
        progressToCenter = Math.abs(0.5f - yRelativeToCenterOffset);
        // Adjust to the maximum scale.
        progressToCenter = Math.min(progressToCenter, MAX_ICON_PROGRESS);

        child.setScaleX(1 - progressToCenter);
        child.setScaleY(1 - progressToCenter);
    }
}

wearableRecyclerView.layoutManager =
        WearableLinearLayoutManager(this, CustomScrollingLayoutCallback())

CustomScrollingLayoutCallback customScrollingLayoutCallback =
                new CustomScrollingLayoutCallback();
wearableRecyclerView.setLayoutManager(
                new WearableLinearLayoutManager(this, customScrollingLayoutCallback));