android - 具有两行布局的 CursorAdapter

Question

好吧，因为我在搜索时没有找到执行此操作的一致方法，所以我决定将我的代码放在其他人的眼睛上可能会有所帮助。

我正在制作一款使用纸牌的游戏。根据不同的因素，这些卡可以被锁定或解锁。重要的是，我想检查 sqlite 数据库是否被锁定，然后为两种可能的结果显示不同的行布局。

这是我的代码:

public class AllCardsAdapter extends CursorAdapter {

LockedHolder viewLocked;
UnlockedHolder viewUnlocked;
private LayoutInflater mInflater;
public static final int LOCKED = 0;
public static final int UNLOCKED = 1;

public AllCardsAdapter(Context context, Cursor cursor) {
    super(context, cursor);
    mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public void bindView(View view, Context context, Cursor cursor) {

    final int type;

    int viewType = this.getItemViewType(cursor.getInt(cursor.getColumnIndex("unlocked")));

    if (viewType == 1){
        type = UNLOCKED;
    } else {
        type = LOCKED;
    }

    if (type == LOCKED){
        viewLocked = (LockedHolder) view.getTag();
        viewLocked.nameHolder.setText(cursor.getString(cursor.getColumnIndex("name")));
        viewLocked.awardedAtHolder.setText("Awarded at level:");
        viewLocked.reqLvlHolder.setText(cursor.getString(cursor.getColumnIndex("reqlvl")));

        String imagePath = cursor.getString(cursor.getColumnIndex("image"));

        if (imagePath.equals("card_obj_plus_1")){
            Picasso.with(context).load(R.drawable.card_obj_plus_1).placeholder(R.drawable.card_placeholder).into(viewLocked.imageHolder);
        }
        if (imagePath.equals("card_obj_plus_2")){
            Picasso.with(context).load(R.drawable.card_obj_plus_2).placeholder(R.drawable.card_placeholder).into(viewLocked.imageHolder);
        }
        if (imagePath.equals("card_obj_plus_3")){
            Picasso.with(context).load(R.drawable.card_obj_plus_3).placeholder(R.drawable.card_placeholder).into(viewLocked.imageHolder);
        }
        if (imagePath.equals("card_slowdown")){
            Picasso.with(context).load(R.drawable.card_slowdown).placeholder(R.drawable.card_placeholder).into(viewLocked.imageHolder);
        }
        if (imagePath.equals("card_speed_up")){
            Picasso.with(context).load(R.drawable.card_speed_up).placeholder(R.drawable.card_placeholder).into(viewLocked.imageHolder);
        }

    } else {
        viewUnlocked = (UnlockedHolder) view.getTag();
        viewUnlocked.nameHolder.setText(cursor.getString(cursor.getColumnIndex("name")));

        String imagePath = cursor.getString(cursor.getColumnIndex("image"));

        if (imagePath.equals("card_obj_plus_1")){
            Picasso.with(context).load(R.drawable.card_obj_plus_1).placeholder(R.drawable.card_placeholder).into(viewUnlocked.imageHolder);
        }
        if (imagePath.equals("card_obj_plus_2")){
            Picasso.with(context).load(R.drawable.card_obj_plus_2).placeholder(R.drawable.card_placeholder).into(viewUnlocked.imageHolder);
        }
        if (imagePath.equals("card_obj_plus_3")){
            Picasso.with(context).load(R.drawable.card_obj_plus_3).placeholder(R.drawable.card_placeholder).into(viewUnlocked.imageHolder);
        }
        if (imagePath.equals("card_slowdown")){
            Picasso.with(context).load(R.drawable.card_slowdown).placeholder(R.drawable.card_placeholder).into(viewUnlocked.imageHolder);
        }
        if (imagePath.equals("card_speed_up")){
            Picasso.with(context).load(R.drawable.card_speed_up).placeholder(R.drawable.card_placeholder).into(viewUnlocked.imageHolder);
        }

    }

}

@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {

    viewLocked = new LockedHolder();
    viewUnlocked = new UnlockedHolder();
    final int type;

    int viewType = this.getItemViewType(cursor.getInt(cursor.getColumnIndex("unlocked")));

    if (viewType == 1){
        type = UNLOCKED;
    } else {
        type = LOCKED;
    }
    System.out.println(viewType);
    System.out.println(type);

    if (type == LOCKED){
        View lockedView;
        lockedView = mInflater.inflate(R.layout.card_list_row_disabled, parent, false);
        viewLocked.nameHolder = (TextView) lockedView.findViewById(R.id.txtTitle);
        viewLocked.imageHolder = (ImageView) lockedView.findViewById(R.id.imgThumbnail);
        viewLocked.reqLvlHolder = (TextView) lockedView.findViewById(R.id.tvLevelNr);
        viewLocked.awardedAtHolder = (TextView) lockedView.findViewById(R.id.tvAwardedAt);
        lockedView.setTag(viewLocked);

        return lockedView;
    } else {
        View unlockedView;
        unlockedView = mInflater.inflate(R.layout.card_list_row, parent, false);
        viewUnlocked.nameHolder = (TextView) unlockedView.findViewById(R.id.txtTitle);
        viewUnlocked.imageHolder = (ImageView) unlockedView.findViewById(R.id.imgThumbnail);
        unlockedView.setTag(viewUnlocked);

        return unlockedView;
    }

}

@Override
public int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    return position % 2;
}

public class LockedHolder {
    public TextView nameHolder;
    public ImageView imageHolder;
    public TextView awardedAtHolder;
    public TextView reqLvlHolder;
}

public class UnlockedHolder {
    public TextView nameHolder;
    public ImageView imageHolder;
}

}

我得到的错误是在行“viewLocked = (LockedHolder) view.getTag();”

AllCardsAdapter$UnlockedHolder 不能转换为 AllCardsAdapter$LockedHolder

仅当我有一个包含已锁定和未锁定卡的列表时才会出现此错误。

我知道它要做什么，只是不知道为什么。另外，如果我无缘无故地使事情过于复杂，或者遗漏了一些明显的东西，如果您能找到它，我将不胜感激..

Answer 1

getItemViewType 实现看起来不正确(类型不依赖于项目位置)它应该类似于以下内容

private int getItemViewType(Cursor cursor) {
    return cursor.getInt(cursor.getColumnIndex("unlocked")) % 2;
}

@Override
public int getItemViewType(int position) {
    Cursor cursor = (Cursor) getItem(position);
    return getItemViewType(cursor);
}

您还需要更新bindView 和newView

int viewType = this.getItemViewType(cursor);