Android中ListView包含CheckBox时滑动丢失选中状态的解决

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jdsjlzx 2022-10-06 00:47:33 博主文章分类：Android开发

现象：listview 中，如果有10项，其中手机屏幕显示1-6项，其余的7-10项在屏幕中不可见，得向下滚动后才能看到，这个时候，如果选中1、2项，再滚动到7-10项，之后再滚动回来1-6项，就发现1、2项并未被选中。

解决方法: 编写自定义的Adapter

public class TestAdapter extends ArrayAdapter<String> {
    private int resource;
    private LayoutInflater inflater;
    private boolean[] checks; //用于保存checkBox的选择状态

    public TestAdapter(Context context, int resource, List<String> list) {
        super(context, resource, list);
        checks = new boolean[list.size()];
        this.resource = resource;
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if(convertView == null){
            convertView = inflater.inflate(resource, null);
            holder = new ViewHolder();
            holder.title = (TextView) convertView.findViewById(R.id.title);
            holder.checkBox = (CheckBox) convertView.findViewById(R.id.checkBox);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.title.setText(getItem(position));
        final int pos  = position; //pos必须声明为final
        holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                checks[pos] = isChecked;
            }});
        holder.checkBox.setChecked(checks[pos]);
        return convertView;
    }
    static class ViewHolder {
        TextView title;
        CheckBox checkBox;
    }
}