android listview 单选功能

单选功能提供Adapter的处理代码

实现的思路是用一个 map 保存下刚才选择的position item, 在adapter里面设置选中状态的时候从 map里面获取。再次点击选择其他position的item的时候，将map中上一次保存的 position的item删掉，最后一次点击的position 在每次点击的时候用一个单独的变量保存。在点击事件里面重新notify当前 adapter 。

import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;import com.ccvideo.R;import com.yizhibo.video.bean.pay.OptionListEntity;public class ExchangeCoinsAdapter extends BaseAdapter {    private Context context;    private List<OptionListEntity> mList;    private Map<Integer, Boolean> isCheckMap = new HashMap<Integer, Boolean>();    private int lastPosition;    private int checkedRmb;    public ExchangeCoinsAdapter(Context context) {        this.context = context;        mList = new ArrayList<OptionListEntity>();    }    public void setData(List<OptionListEntity> list) {        mList = list;    }    @Override    public int getCount() {        return mList.size();    }    @Override    public Object getItem(int i) {        return null;    }    @Override    public long getItemId(int i) {        return i;    }    @Override    public View getView(final int i, View view, ViewGroup viewGroup) {        ViewHolder viewHolder = null;        if (view == null) {            view = LayoutInflater.from(context).inflate(R.layout.item_exchange_coins, viewGroup, false);            viewHolder = new ViewHolder();            viewHolder.exchangeCoinsTv = (TextView) view.findViewById(R.id.exchange_coins_tv);            viewHolder.exchangeGiveCoinsTv = (TextView) view.findViewById(R.id.exchange_coins_give_tv);            viewHolder.exchangeMoneyCb = (CheckBox) view.findViewById(R.id.exchange_money_tv);            view.setTag(viewHolder);        } else {            viewHolder = (ViewHolder) view.getTag();        }        final OptionListEntity model = mList.get(i);        viewHolder.exchangeCoinsTv.setText(context.getString(R.string.e_coin_count_rear, model.getEcoin()));        viewHolder.exchangeGiveCoinsTv                .setText(context.getString(R.string.e_coin_give_count_rear, model.getFree()));        viewHolder.exchangeMoneyCb                .setText(context.getString(R.string.cash_count_simple, model.getRmb() / 100));        viewHolder.exchangeMoneyCb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                if (isCheckMap.size() > 0) {                    isCheckMap.remove(lastPosition);                }                checkedRmb = model.getRmb();                isCheckMap.put(i, true);                lastPosition = i;                ExchangeCoinsAdapter.this.notifyDataSetChanged();            }        });        if (isCheckMap != null && isCheckMap.containsKey(i)) {            viewHolder.exchangeMoneyCb.setSelected(isCheckMap.get(i));        } else {            viewHolder.exchangeMoneyCb.setSelected(false);        }        return view;    }    public int getCheckedRmb() {        return checkedRmb;    }    protected static class ViewHolder {        TextView exchangeCoinsTv;        TextView exchangeGiveCoinsTv;        CheckBox exchangeMoneyCb;    }}

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