无法在带有GDK的卡片上显示“Read More”（读取更多信息）

Question

case R.id.read_more:
    intent = new Intent(this, ReadMoreActivity.class);
    intent.putExtra(ReadMoreActivity.TEXT, text);
    startActivity(intent);
    return true;

public class ReadMoreActivity extends Activity {

public static final String TEXT = "text";

private static final boolean DEBUG = true;
private static final String TAG = ReadMoreActivity.class.getSimpleName();

private static final float SPACING_MULT = 1.0f;
private static final float SPACING_ADD = 1.0f;
private static final boolean INCLUDE_PAD = false;

private String mText;
private CardScrollView mCardScrollView;
private TextCardScrollAdapter mAdapter;
private List<Card> mCards;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (savedInstanceState != null && savedInstanceState.containsKey(TEXT))
        mText = savedInstanceState.getString(TEXT);
    else if (getIntent() != null && getIntent().hasExtra(TEXT))
        mText = getIntent().getStringExtra(TEXT);
    else {
        Log.e(TAG, "no text found");
        finish();
        return;
    }

    createCardsFromText();
    mAdapter = new TextCardScrollAdapter();

    View rootLayout = getLayoutInflater().inflate(R.layout.card_scroll_layout, null);
    mCardScrollView = (CardScrollView)rootLayout.findViewById(R.id.card_scroll_view);
    mCardScrollView.setAdapter(mAdapter);
    mCardScrollView.activate();
    setContentView(rootLayout);
}

private void createCardsFromText() {
    int textSize = getResources().getDimensionPixelSize(R.dimen.card_main_layout_main_min_textSize);
    int maxWidth = getResources().getDimensionPixelSize(R.dimen.card_main_layout_main_width);
    int maxHeight = getResources().getDimensionPixelSize(R.dimen.card_main_layout_main_height);

    TextView tv = new TextView(this);
    tv.setTextSize(textSize);
    tv.setText(mText);
    StaticLayout measure = new StaticLayout(tv.getText(), tv.getPaint(),
            maxWidth, Layout.Alignment.ALIGN_NORMAL, 1.0f, 1.0f, false);
    int numLines = measure.getLineCount();
    if (DEBUG) Log.i(TAG, "calculated lines=" + numLines + " for text=[" + mText + "]");

    int linesPerCard = maxHeight / textSize;
    int numFullCards = numLines / linesPerCard;
    int numCards = numFullCards + (numLines % linesPerCard > 0 ? 1 : 0);

    mCards = new ArrayList<Card>();
    for (int cardNum = 0; cardNum < numCards; cardNum++) {
        int startLine = cardNum * linesPerCard;
        int nextStartLine = startLine + linesPerCard;
        int startOffset = measure.getLineStart(startLine);
        int endOffset = (nextStartLine < numLines) ? measure.getLineStart(nextStartLine) : mText.length();
        String cardText = mText.substring(startOffset, endOffset);
        Card card = new Card(this);
        card.setText(cardText);
        String cardFootnote = getString(R.string.read_more_format, cardNum + 1, numCards);
        card.setFootnote(cardFootnote);
        mCards.add(card);
    }
}

private class TextCardScrollAdapter extends CardScrollAdapter {
    @Override
    public int findIdPosition(Object id) {
        return -1;
    }
    @Override
    public int findItemPosition(Object item) {
        return mCards.indexOf(item);
    }
    @Override
    public int getCount() {
        return mCards.size();
    }
    @Override
    public Object getItem(int position) {
        return mCards.get(position);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        return mCards.get(position).toView();
    }
}
}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black">

    <com.google.android.glass.widget.CardScrollView
        android:id="@+id/card_scroll_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

<dimen name="card_main_layout_main_width">560px</dimen>
<dimen name="card_main_layout_main_height">240px</dimen>
<dimen name="card_main_layout_main_min_textSize">30px</dimen>
<dimen name="card_main_layout_footnote_width">560px</dimen>
<dimen name="card_main_layout_footnote_height">40px</dimen>

<string name="read_more_format">read more ~ page %1$d of %2$d</string>