Google Glass - 通过设置选择“跳转”到卡片滚动视图中的卡片不起作用

Question

对我来说，功能 cardScrollView.setSelection(cardScrollView.getSelectedItemPosition() + 1) 似乎不起作用。

在我的 glass 收到来自我的 nodeJs 服务器的消息后，我正在调用该函数，但它似乎没有做任何事情。它没有向我显示另一张卡片。

当我调用 cardScrollView.getSelectedItemPosition() 时，我确实得到了当前选定的索引。

也许我做错了什么？

这是我试图调用该函数的 mainActivity（我正在谈论的行在 client.on("event", new EventCallback() 函数中）：

package com.inspectie.team.inspecteren;

import com.google.android.glass.media.Sounds;
import com.google.android.glass.widget.CardBuilder;
import com.google.android.glass.widget.CardScrollAdapter;
import com.google.android.glass.widget.CardScrollView;

import com.inspectie.team.inspecteren.card.CardsActivity;
import com.inspectie.team.inspecteren.card.ContactActivity;
import com.inspectie.team.inspecteren.card.DoActivity;
import com.inspectie.team.inspecteren.card.CardAdapter;
import com.google.android.glass.widget.CardBuilder;
import com.google.android.glass.widget.CardScrollAdapter;
import com.google.android.glass.widget.CardScrollView;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;

import java.util.ArrayList;
import java.util.List;
import com.koushikdutta.async.http.AsyncHttpClient;
import com.koushikdutta.async.http.socketio.Acknowledge;
import com.koushikdutta.async.http.socketio.ConnectCallback;
import com.koushikdutta.async.http.socketio.EventCallback;
import com.koushikdutta.async.http.socketio.JSONCallback;
import com.koushikdutta.async.http.socketio.SocketIOClient;
import com.koushikdutta.async.http.socketio.StringCallback;

import org.json.JSONArray;
import org.json.JSONObject;

/**
 * An {@link Activity} showing a tuggable "Hello World!" card.
 * <p>
 * The main content view is composed of a one-card {@link CardScrollView} that provides tugging
 * feedback to the user when swipe gestures are detected.
 * If your Glassware intends to intercept swipe gestures, you should set the content view directly
 * and use a {@link com.google.android.glass.touchpad.GestureDetector}.
 * @see <a href="https://developers.google.com/glass/develop/gdk/touch">GDK Developer Guide</a>
 */
public class MainActivity extends Activity {

    private static final String TAG = MainActivity.class.getSimpleName();

    // Index of api demo cards.
    // Visible for testing.
    static final int CARD_BUILDER = 0;
    static final int CONTACT_MENU = 1;
    static final int DO_MENU = 2;

    boolean isConnected;
    public static final String KEY_DEVICE_ID = "sender";
    public static final String KEY_MESSAGE = "message";
    public String device_id;
    SocketIOClient mClient;

    private CardScrollAdapter mAdapter;
    private CardScrollView mCardScroller;

    // Visible for testing.
    CardScrollView getScroller() {
        return mCardScroller;
    }

    @Override
    protected void onCreate(Bundle bundle) {
        super.onCreate(bundle);

        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        // Request feature voice commands from API
        //getWindow().requestFeature(WindowUtils.FEATURE_VOICE_COMMANDS);

        mAdapter = new CardAdapter(createCards(this));
        mCardScroller = new CardScrollView(this);
        mCardScroller.setAdapter(mAdapter);
        setContentView(mCardScroller);
        setCardScrollerListener();

        SocketIOClient.connect(AsyncHttpClient.getDefaultInstance(), "http://145.24.243.198:5000", new ConnectCallback() {

            @Override
            public void onConnectCompleted(Exception ex, SocketIOClient client) {
                Log.i("SOCKET", "CONNECTION HIEROOOOOO");
                if (ex != null) {
                    ex.printStackTrace();
                    return;
                }

                client.setStringCallback(new StringCallback() {
                    @Override
                    public void onString(String string, Acknowledge acknowledge) {
                        Log.d("SOCKET", string);
                    }
                });

                client.setJSONCallback(new JSONCallback() {
                    @Override
                    public void onJSON(JSONObject jsonObject, Acknowledge acknowledge) {
                        Log.d("SOCKET", jsonObject.toString());
                    }
                });

                client.on("event", new EventCallback() {
                    @Override
                    public void onEvent(JSONArray jsonArray, Acknowledge acknowledge) {

                        Log.i("DATA: ", "RECEIVED");

 //SO HERE GOES NOTHING:
                            mCardScroller.setSelection(mCardScroller.getSelectedItemPosition() + 1);
                                mCardScroller.startAnimation(AnimationUtils.makeInAnimation(mCardScroller.getContext(), true));
                        }
                    });
                    mClient = client;
            }
        });

    }

    /**
     * Create list of API demo cards.
     */
    private List<CardBuilder> createCards(Context context) {
        ArrayList<CardBuilder> cards = new ArrayList<CardBuilder>();

        cards.add(CARD_BUILDER, new CardBuilder(context, CardBuilder.Layout.MENU)
                .setText(R.string.main_menu_check)
                .setIcon(R.drawable.icon_checklist));

        cards.add(CONTACT_MENU, new CardBuilder(context, CardBuilder.Layout.MENU)
                .setText(R.string.main_menu_contact)
                .setIcon(R.drawable.icon_contact));

        cards.add(DO_MENU, new CardBuilder(context, CardBuilder.Layout.MENU)
                .setText(R.string.main_menu_do)
                .setIcon(R.drawable.icon_tips));


        return cards;
    }

    @Override
    protected void onResume() {
        super.onResume();
        mCardScroller.activate();
    }

    @Override
    protected void onPause() {
        mCardScroller.deactivate();
        super.onPause();
    }

    /**
     * Different type of activities can be shown, when tapped on a card.
     */
    private void setCardScrollerListener() {
        mCardScroller.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                int soundEffect = Sounds.TAP;

                switch (position) {
                    case CARD_BUILDER:
                        startActivity(new Intent(MainActivity.this, CardsActivity.class));
                        break;

                    case DO_MENU:
                        startActivity(new Intent(MainActivity.this, DoActivity.class));
                        break;

                    case CONTACT_MENU:
                        startActivity(new Intent(MainActivity.this, ContactActivity.class));
                        break;

                    default:
                        soundEffect = Sounds.ERROR;
                        Log.d(TAG, "Don't show anything");
                }

                // Play sound.
                AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
                am.playSoundEffect(soundEffect);
            }
        });
    }

}

有人有什么建议吗？我已经对此进行了几个小时的研究，但我正在拔头发。

谢谢！

布拉姆

Answer 1

您正在寻找的方法是 [CardScrollView#animate](https://developers.google.com/glass/develop/gdk/reference/com/google/android/glass/widget/CardScrollView#animate(int, com.google.android.glass.widget.CardScrollView.Animation)) 之一：

例如CardScrollAdapter:

private class ExampleCardScrollAdapter extends CardScrollAdapter {
    ...

    // Inserts a card into the adapter, without notifying.
    public void insertCardWithoutNotification(int position, CardBuilder card) {
        mCards.add(position, card);
    }
}

来自您的Activity：

private void insertNewCard(int position, CardBuilder card) {
    // Insert new card in the adapter, but don't call
    // notifyDataSetChanged() yet. Instead, request proper animation
    // to inserted card from card scroller, which will notify the
    // adapter at the right time during the animation.
    mAdapter.insertCardWithoutNotification(position, card);
    mCardScrollView.animate(position, CardScrollView.Animation.INSERTION);
}

这会在不通知视图任何数据集更改的情况下插入卡片，并要求视图动画到新位置。