Question

这是我CustomObdRowAdapter.java 我在顶部添加了一个“Select All”行，当用户选择它时，应该检查当前listView中的所有项目，但是我应该如何在我的自定义行适配器中实现它？

private class ViewHolder{
    CheckBox name;
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
    ViewHolder holder = null;
    LayoutInflater settingInflater = LayoutInflater.from(getContext());
    if (convertView == null) {
        convertView = settingInflater.inflate(R.layout.custom_row, parent, false);
        holder = new ViewHolder();
        holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
        convertView.setTag(holder);


}else{
            holder = (ViewHolder)convertView.getTag();
        }
        holder.name.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                CheckBox cb = (CheckBox) v;
                RowCheckbox rowCommandCheckbox = (RowCheckbox) cb.getTag();

                if (cb.getText() == ifAllSelectStr){
                    if (cb.isChecked()){          
                       // Select all items in this listView
                    }else{
                       // Unselect all items in this listView
                        }
                    }

Answer 1

// select all
for (int i = 0; i < adapter.getCount(); i++) {
    list.setItemChecked(i, true);
}

// unselect all
for (int i = 0; i < adapter.getCount(); i++) {
    list.setItemChecked(i, false);
}

您可能需要从适配器外部调用它

getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

Answer 2

 boolean isAllTrue=false;
 @Override
public View getView(final int position, View convertView, final ViewGroup parent) {
  ViewHolder holder = null;
LayoutInflater settingInflater = LayoutInflater.from(getContext());
if (convertView == null) {
    convertView = settingInflater.inflate(R.layout.custom_row, parent,  false);
    holder = new ViewHolder();
    holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);

    }
else{
        holder = (ViewHolder)convertView.getTag();
    }
    holder.name.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            CheckBox cb = (CheckBox) v;
            RowCheckbox rowCommandCheckbox = (RowCheckbox) cb.getTag();

            if (cb.getText() == ifAllSelectStr){
                if (cb.isChecked()){          
         isAllTrue=true;
      // Select all items in this listView
                }else{
               isAllTrue=false;
                   // Unselect all items in this listView
                    }
               notifyDataSetChanged();
                }
}

convertView.setTag（holder）; //始终将此设置标记放在if else // of tag之外 holder.name.setChecked（isAllTrue）; } // getView函数的结尾

在上面的代码中，他们首先要做的两件事是更改viewholder的设置标签以查看并将其放在函数的末尾，然后返回convertView，第二次创建boolean for allTrue，当所有项目选中时单击listner调用然后通知采用者重绘。

将Select All行添加到ListView中

2 个答案: