aris-old/IrisGlass/app/src/main/java/sh/nym/irisglass/FeedActivity.java

package sh.nym.irisglass;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.Toast;

import com.google.android.glass.widget.CardScrollView;

import java.util.ArrayList;
import java.util.List;

public final class FeedActivity extends Activity {
    private static final int REQ_MENU = 1;

    private CardScrollView cardScrollView;
    private FeedAdapter adapter;
    private FeedItem selectedItem;

    private final HudState.Listener hudListener = new HudState.Listener() {
        @Override
        public void onHudStateChanged(HudState.Snapshot snapshot, boolean shouldRender) {
            // FeedActivity should always update while visible.
            adapter.setItems(buildVisibleItems(snapshot));
            try {
                cardScrollView.setSelection(0);
            } catch (Throwable ignored) {
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);

        cardScrollView = new CardScrollView(this);
        adapter = new FeedAdapter(this, makeWaitingCard());
        cardScrollView.setAdapter(adapter);
        cardScrollView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                onCardTapped(position);
            }
        });
        setContentView(cardScrollView);
    }

    @Override
    protected void onResume() {
        super.onResume();
        cardScrollView.activate();
        HudState.get().addListener(hudListener);
        adapter.setItems(buildVisibleItems(HudState.get().snapshot()));
    }

    @Override
    protected void onPause() {
        try {
            HudState.get().removeListener(hudListener);
        } catch (Throwable ignored) {
        }
        cardScrollView.deactivate();
        super.onPause();
    }

    private void onCardTapped(int position) {
        Object obj = adapter.getItem(position);
        if (!(obj instanceof FeedItem)) return;
        selectedItem = (FeedItem) obj;
        startActivityForResult(MenuActivity.newIntent(this, selectedItem), REQ_MENU);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, android.content.Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode != REQ_MENU || resultCode != RESULT_OK || data == null) return;

        String cardId = data.getStringExtra(MenuActivity.EXTRA_CARD_ID);
        String action = data.getStringExtra(MenuActivity.EXTRA_ACTION);
        if (cardId == null || action == null) return;

        if ("DISMISS".equals(action)) {
            adapter.removeById(cardId);
        } else if ("SNOOZE_2H".equals(action)) {
            adapter.removeById(cardId);
        } else if ("SNOOZE_24H".equals(action)) {
            adapter.removeById(cardId);
        } else if ("SAVE".equals(action)) {
            Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();
        }

        if (adapter.getCount() == 0) {
            adapter.setItems(makeWaitingCard());
        }
    }

    private List<FeedItem> makeWaitingCard() {
        ArrayList<FeedItem> items = new ArrayList<FeedItem>();
        items.add(new FeedItem(
                "local:empty",
                FeedItemType.INFO,
                "No cards",
                "Waiting for feed…",
                0.0,
                1,
                "",
                new ArrayList<String>()
        ));
        return items;
    }

    private List<FeedItem> buildVisibleItems(HudState.Snapshot snapshot) {
        if (snapshot == null) return makeWaitingCard();
        FeedEnvelope env = new FeedEnvelope(1, 0L, snapshot.items, snapshot.meta);
        List<FeedItem> items = env.activeItems();
        if (items.isEmpty()) return makeWaitingCard();

        ArrayList<FeedItem> filtered = new ArrayList<FeedItem>();
        for (int i = 0; i < items.size(); i++) {
            FeedItem it = items.get(i);
            if (it == null) continue;
            filtered.add(it);
        }
        if (filtered.isEmpty()) return makeWaitingCard();
        return filtered;
    }

}