Question

我正在使用listFragment，它使用自定义CursorAdapter来扩展listView。列表布局中包含的元素之一是默认情况下不可见的Checkbox。当我按下一个按钮（在我的情况下 - ＆gt; onOptionsItemSelected）时，我想让所有项目中的Checkbox可见。但是，通过使用我的代码，我的listItems只有一个Checkbox可见，其余的仍然是不可见的。

这是我的代码

public class ItemAdapter extends CursorAdapter {
private LayoutInflater mLayoutInflater;
private static Context mContext;
private static View v;

public ItemAdapter(Context context, Cursor c) {
    super(context, c, false);
    mContext = context;
    mLayoutInflater = LayoutInflater.from(context);
}

private static class ViewHolder{
    TextView firstName;
    TextView lastName;
    TextView organisation;
    FrameLayout iconContainer;
    CheckBox checkBox;
}

private static class RowData {
    int id;
    String firstName;
    String lastName;
    String organisation;
    byte[] icon;
    int position;
}


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

    v = mLayoutInflater.inflate(R.layout.db_layout, parent, false);

    ViewHolder viewHolder = new ViewHolder();
    viewHolder.firstName = (TextView)v.findViewById(R.id.textViewItemFirstName);
    viewHolder.lastName = (TextView)v.findViewById(R.id.textViewItemLastName);
    viewHolder.organisation = (TextView)v.findViewById(R.id.textViewItemOrganisation);
    viewHolder.iconContainer = (FrameLayout)v.findViewById(R.id.list_image_container);
    viewHolder.checkBox = (CheckBox)v.findViewById(R.id.checkBox);

    viewHolder.checkBox.setVisibility(View.INVISIBLE);

    v.setTag(viewHolder);

    return v;
}


@Override
public void bindView(View v, Context context, Cursor c) {

    final RowData rowData = new RowData();
    rowData.id = c.getInt(c.getColumnIndexOrThrow(DBAdapter.KEY_ROWID));
    rowData.firstName = c.getString(c.getColumnIndexOrThrow(DBAdapter.KEY_FIRSTNAME));
    rowData.lastName = c.getString(c.getColumnIndexOrThrow(DBAdapter.KEY_LASTNAME));
    rowData.organisation = c.getString(c.getColumnIndexOrThrow(DBAdapter.KEY_ORGANISATION));
    rowData.icon = c.getBlob(c.getColumnIndexOrThrow(DBAdapter.KEY_ICON));
    rowData.position = c.getPosition();

    final ViewHolder viewHolder = (ViewHolder)v.getTag();
    viewHolder.firstName.setText(rowData.firstName);
    viewHolder.lastName.setText(rowData.lastName);
    viewHolder.organisation.setText(rowData.organisation);
    viewHolder.iconContainer.setBackgroundDrawable(getIcon(context, rowData.icon)); }

我的按钮正在调用的方法：

public static void checkboxVisibility(){
    ViewHolder viewHolder = (ViewHolder)v.getTag();
    viewHolder.checkBox.setVisibility(View.VISIBLE);
}

我甚至调用了notifyDataSetChanged（）但它没有任何影响力。我非常感谢你的帮助。

Answer 1

尝试此操作，将此方法放在创建ItemAdapter和ListView的片段上。在onOptionsItemSelected上调用它。

public void showCheckBoxes(){
    int childSize = listView.getChildCount();
    for(int i = 0; i < childSize; i++) {
            View listItem = listView.getChildAt(i);
        if (listItem != null) {                 
            CheckBox checkBox = (CheckBox) listItem.findViewById(R.id.checkBox);
            checkBox.setVisibility(View.VISIBLE);
        }
    }
}

我不在这里安装Android Studio，但尝试一下，当我回到家时，我也会尝试。

Android Custom CursorAdapter setVisibility

1 个答案: