ListView里的CheckBox使用

来源：互联网发布：材料数据库编辑：程序博客网时间：2024/05/17 07:03

这里写图片描述

先说布局
布局也就一个listview + 一个button，然后item的布局如下

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"><LinearLayout    android:id="@+id/ll"    android:padding="10dp"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="horizontal">    <TextView        android:id="@+id/tv_name"        android:layout_gravity="center_vertical"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textColor="@color/gray_33"        android:layout_marginRight="10dp"        android:textSize="16sp"/>    <TextView        android:id="@+id/tv_description"        android:layout_gravity="center_vertical"        android:layout_width="0dp"        android:layout_weight="1"        android:textSize="14sp"        android:layout_height="wrap_content"/>    <CheckBox        android:id="@+id/item_cb"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textColor="@color/gray_33"        android:layout_gravity="center_vertical" /></LinearLayout></LinearLayout>

lv_data.setAdapter(new ServiceAdapter(Main.this,initData()));

ServiceAdapter

public class ServiceAdapter extends BaseAdapter {    private List<ServiceItem.ServicesBean> mDataset;    private Context context;    public LinkedHashMap<Integer, ServiceItem.ServicesBean> cbMap = new LinkedHashMap<>();    // 用来控制CheckBox的选中状况    private LinkedHashMap<Integer, Boolean> isSelected;    private StringBuilder sb = new StringBuilder();    public ServiceAdapter(Context context, List<ServiceItem.ServicesBean> mDataset) {        this.mDataset = mDataset;        this.context = context;        isSelected = new LinkedHashMap<>();        initDate();    }    private void initDate() {        for (int i = 0; i < mDataset.size(); i++) {            isSelected.put(i, false);        }    }    @Override    public int getCount() {        return mDataset.size();    }    @Override    public Object getItem(int position) {        return mDataset.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        final ViewHolder viewHolder;        final int index = position;        if (convertView == null) {            viewHolder = new ViewHolder();            convertView = LayoutInflater.from(context).inflate(R.layout.list_item_service, null);            viewHolder.cb = (CheckBox) convertView.findViewById(R.id.item_cb);            viewHolder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);            viewHolder.tv_description = (TextView) convertView.findViewById(R.id.tv_description);            convertView.setTag(viewHolder);        } else {            viewHolder = (ViewHolder) convertView.getTag();        }        viewHolder.cb.setChecked(isSelected.get(position));        viewHolder.tv_name.setText(mDataset.get(position).getName());        viewHolder.tv_description.setText(mDataset.get(position).getIntroduce());        viewHolder.cb.setOnClickListener(new View.OnClickListener() {            public void onClick(View v) {                if (isSelected.get(position)) {                    isSelected.put(position, false);                    cbMap.remove(position);                } else {                    isSelected.put(position, true);                    cbMap.put(position, mDataset.get(position));                }                if(cbMap.size() > 4){                    viewHolder.cb.toggle();                    ToastUtils.showToast((Activity)context,"最多选择四个");                    cbMap.remove(position);                    isSelected.put(position, false);                }            }        });        return convertView;    }    class ViewHolder {        public CheckBox cb;        public TextView tv_name;        public TextView tv_description;    }    //供activity获取选中的数据    public List<ServiceItem.ServicesBean> getSelectedData(){        if(cbMap.size() > 0){            List<ServiceItem.ServicesBean> mSelectedData = new ArrayList<>();            for (Integer key : cbMap.keySet()) {                mSelectedData.add(mDataset.get(key));            }            return mSelectedData;        }else{            return null;        }    }}

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