Question

所以我列出了不同类型的单元格，以及应该包含的内容。我试图加载每个，但我的适配器只会加载这么多，然后重复这些单元格。这是我的适配器类

public class FormCellAdapter extends ArrayAdapter<Cell> {

    private final Context context;

    private static class ViewHolder {
        // All cells
        TextView questionLabel;

        // Checkbox cell
        LinearLayout checkGroup;

        // Date cell
        Button dateButton;

        // Dropdown cell
        Spinner spinner;

        // Slider cell
        SeekBar seekBar;
        TextView sliderLabel;

        // Text area cell
        EditText textArea;

        // Dropdown cell, text field cell, text field toggle cell
        EditText textField;

        // Text field toggle cell, toggle cell
        RadioGroup radioGroup;
    }

    public FormCellAdapter(Context context, ArrayList<Cell> cells) {
        super(context, 0, cells);

        this.context = context;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final Cell cell = getItem(position);

        final int layout = cell.getLayoutFile();
        final CellType type = cell.getCellType();

        final ViewHolder viewHolder;

        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(layout, parent, false);

            viewHolder.questionLabel = (TextView) convertView.findViewById(R.id.questionTextLabel);
            viewHolder.questionLabel.setText(cell.getQuestion());

            switch (type) {
                case CHECKBOX:
                    viewHolder.checkGroup = (LinearLayout) convertView.findViewById(R.id.checkGroup);
                    break;
                case DATE:
                    viewHolder.dateButton = (Button) convertView.findViewById(R.id.dateButton);
                    break;
                case DROPDOWN:
                    viewHolder.spinner = (Spinner) convertView.findViewById(R.id.spinner);
                    viewHolder.textField = (EditText) convertView.findViewById(R.id.textField);
                    break;
                case SLIDER:
                    viewHolder.seekBar = (SeekBar) convertView.findViewById(R.id.seekbar);
                    viewHolder.sliderLabel = (TextView) convertView.findViewById(R.id.sliderLabel);
                    break;
                case TEXTAREA:
                    viewHolder.textArea = (EditText) convertView.findViewById(R.id.textArea);
                    break;
                case TEXTFIELD:
                    viewHolder.textField = (EditText) convertView.findViewById(R.id.textField);
                    break;
                case TEXTFIELDTOGGLE:
                    viewHolder.radioGroup = (RadioGroup) convertView.findViewById(R.id.radioGroup);
                    viewHolder.textField = (EditText) convertView.findViewById(R.id.textField);
                case TOGGLE:
                    viewHolder.radioGroup = (RadioGroup) convertView.findViewById(R.id.radioGroup);
                    break;
            }

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        // This will be filled in later, populating the labels and whatever else needs done.
        switch (type) {
            case CHECKBOX:

                break;
            case DATE:

                break;
            case DROPDOWN:

                break;
            case SLIDER:

                break;
            case TEXTAREA:

                break;
            case TEXTFIELD:

                break;
            case TEXTFIELDTOGGLE:

            case TOGGLE:

                break;
        }

        return convertView;
    }
}

我已经从中删除了很多代码，因为我想我也可以重新开始。在它随机选择进入的细胞之前，通常在向下滚动然后再向上移动时顶部的细胞会有所不同。

任何想法，为什么我没有看到我的所有细胞，以及为什么他们会重复自己？

Answer 1

覆盖getCount（）以返回要显示的单元格数。

Answer 2

您的问题是您正在使用ViewHolder模式。使用ViewHolder模式的目的是将布局文件jsut膨胀一次，然后在下一个列表项中重用该膨胀的视图。为了扩展不同的布局文件，每次布局文件在getView中更改时，都必须对它们进行膨胀。您的getView方法将如下所示：

        // All cells
        TextView questionLabel;

        // Checkbox cell
        LinearLayout checkGroup;

        // Date cell
        Button dateButton;

        // Dropdown cell
        Spinner spinner;

        // Slider cell
        SeekBar seekBar;
        TextView sliderLabel;

        // Text area cell
        EditText textArea;

        // Dropdown cell, text field cell, text field toggle cell
        EditText textField;

        // Text field toggle cell, toggle cell
        RadioGroup radioGroup;

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    final Cell cell = getItem(position);

    final int layout = cell.getLayoutFile();
    final CellType type = cell.getCellType();

        View view = LayoutInflater.from(context).inflate(layout, parent, false);

        questionLabel = (TextView) view.findViewById(R.id.questionTextLabel);
        questionLabel.setText(cell.getQuestion());

        switch (type) {
            case CHECKBOX:
                checkGroup = (LinearLayout) view.findViewById(R.id.checkGroup);
                break;
            case DATE:
                dateButton = (Button) view.findViewById(R.id.dateButton);
                break;
            case DROPDOWN:
                spinner = (Spinner) view.findViewById(R.id.spinner);
                textField = (EditText) view.findViewById(R.id.textField);
                break;
            case SLIDER:
                seekBar = (SeekBar) view.findViewById(R.id.seekbar);
                sliderLabel = (TextView) view.findViewById(R.id.sliderLabel);
                break;
            case TEXTAREA:
                textArea = (EditText) view.findViewById(R.id.textArea);
                break;
            case TEXTFIELD:
                textField = (EditText) view.findViewById(R.id.textField);
                break;
            case TEXTFIELDTOGGLE:
                radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
                textField = (EditText) view.findViewById(R.id.textField);
            case TOGGLE:
                radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
                break;
        }

    // This will be filled in later, populating the labels and whatever else needs done.
    switch (type) {
        case CHECKBOX:

            break;
        case DATE:

            break;
        case DROPDOWN:

            break;
        case SLIDER:

            break;
        case TEXTAREA:

            break;
        case TEXTFIELD:

            break;
        case TEXTFIELDTOGGLE:

        case TOGGLE:

            break;
    }

    return view;
}

列出具有多个细胞类型重复细胞的适配器

2 个答案: