我的问题是我已经创建了一个浸入式活动，里面有几张卡片。当我尝试在卡片之间滑动时，没有任何反应。我可以向下滑动以结束活动，但我无法在卡片之间滑动。有趣的是，如果我让玻璃杯进入睡眠然后再将其唤醒，我可以在卡片之间滑动。由于这种奇怪，我很确定我错过了一行代码，这些代码可以让卡片集中注意力，但我不知道它是什么。
我找到了使用手势检测器的解决方法，但它看起来不像普通的刷卡，所以我想避免这种情况。我的代码如下：
package com.akqa.glass.recipie;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.TextView;
import com.google.android.glass.media.Sounds;
import com.google.android.glass.view.WindowUtils;
import com.google.android.glass.widget.CardBuilder;
import com.google.android.glass.widget.CardScrollAdapter;
import com.google.android.glass.widget.CardScrollView;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.util.ArrayList;
import java.util.List;
/**
* Created by torti_000 on 11/29/2014.
*/
public class PairingsActivity extends Activity {
private CardAdapter mAdapter;
private CardScrollView mCardScroller;
private int mTapPosition;
private final Handler handler = new Handler();
private boolean mVoiceMenuEnabled = true;
private String ingredientUrl = null;
private static final String TAG = "Ingredients";
private static final String URL_BASE = "http://www.ingredientpairings.com/?i=";
private ArrayList<String> iList;
//Number of ingredients to display per card.
private static final int ITEMS_PER_CARD = 4;
private int numCards;
String object = null;
Context context;
private View mView;
@Override
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
//Loading
mView = buildView();
mCardScroller = new CardScrollView(this);
mCardScroller.setAdapter(new CardScrollAdapter() {
@Override
public int getCount() {
return 1;
}
@Override
public Object getItem(int position) {
return mView;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
return mView;
}
@Override
public int getPosition(Object item) {
if (mView.equals(item)) {
return 0;
}
return AdapterView.INVALID_POSITION;
}
});
setContentView(mCardScroller);
Log.d(TAG, "View has been set");
mCardScroller.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Plays sound.
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
am.playSoundEffect(Sounds.TAP);
}
});
//Recipes
iList = new ArrayList<String>();
context = this;
Intent pairings = getIntent();
object = pairings.getStringExtra("Object");
Log.i(TAG, "Pairings thinks object is: " + object);
new GetIngredients().execute(object);
}
/**
* Create Loding Page
*/
private View buildView() {
Log.d(TAG, "Creating Loading Card");
CardBuilder card = new CardBuilder(this, CardBuilder.Layout.TEXT);
card.setText("Loading");
return card.getView();
}
/**
* Creates list of cards that showcase different type of {@link com.google.android.glass.widget.CardBuilder} API.
*/
private List<CardBuilder> createCards(Context context) {
ArrayList<CardBuilder> cards = new ArrayList<CardBuilder>();
Log.i(TAG, "Creating Cards");
/*
* One ingredient per card...
*/
for(int i = 0; i < iList.size(); i++){
cards.add(new CardBuilder(context, CardBuilder.Layout.TEXT)
.setText(iList.get(i)));
Log.d(TAG, "Ingredient is: " + iList.get(i));
}
Log.d(TAG, "Done adding pairings?");
return cards;
}
@Override
protected void onResume() {
super.onResume();
mCardScroller.activate();
}
@Override
protected void onPause() {
mCardScroller.deactivate();
super.onPause();
}
public class GetIngredients extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... strings) {
StringBuffer buffer = new StringBuffer();
try {
ingredientUrl = object.replaceAll(" ", "+");
Log.d(TAG, ingredientUrl);
// strings[0].replaceAll(" ", "+");
Log.d(TAG, "Finding matches for " + object);
Document doc = Jsoup.connect(URL_BASE + ingredientUrl).get();
Log.d(TAG, "Matches found for " + object);
Elements ingredients = doc.select("div.main p b");
// Log.d(TAG, "Ingredients are: " + ingredients.toString());
for (Element ingredient : ingredients) {
String data = ingredient.text();
iList.add(data);
buffer.append("Data [" + data + "] \r\n");
Log.d(TAG, "Ingredient is: " + data);
}
}
catch(Throwable t) {
t.printStackTrace();
}
return buffer.toString();
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
// Compute the number of cards needed to display the items with 4 per card (rounding up to
// capture the remainder).
numCards = (int) Math.ceil((double) iList.size() / ITEMS_PER_CARD);
startCards();
}
}
private void startCards(){
mAdapter = new CardAdapter(createCards(this));
// mCardScroller = new CardScrollView(this);
mCardScroller.setAdapter(mAdapter);
setContentView(mCardScroller);
}
}
答案 0 :(得分：1)
在你的onCreate（）中，在setContentView（）之前添加这一行，如下所示：
mCardScroller.activate(); //add this line
setContentView(mCardScroller);
你的onResume（）中有这一行，这就是它的行为原因。
答案 1 :(得分：0)
我遇到了在CardScrollView和SurfaceView之间切换内容视图的问题。在确保onPause（）和onResume（）都在逻辑上正确的位置被调用之后，滚动条很好。
似乎CardScrollView失去焦点然后滚动失去了功能，调用.activate（）只有在事先调用.deactivate（）时才有效，因此为什么需要同时调用onPause（）和onResume（）在逻辑上正确的位置，在onPause（）中调用.deactivate（），在onResume（）中调用.activate（）。我试着自己调用.deactivate（）和.activate（）而不是onPause（）和onResume（），两个实例的行为相同，支持我在这里写的内容。
因此，简而言之，如果使用setContentView（）在视图之间切换，请务必在切换之前调用onPause（），然后在切换之后调用onResume（），否则滚动条将停止响应。