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  • ListView与CheckBox组合实现单选

    main.xml配置文件
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
    
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="@string/hello" />
        
            <ListView android:id="@+id/lv_single_list"
            android:descendantFocusability="blocksDescendants"
            android:fastScrollEnabled="true" android:clickable="true"
            android:divider="@drawable/divider_horizontal_timeline"
            android:dividerHeight="1.0dip" android:layout_width="fill_parent"
            android:layout_height="400dp" android:scrollingCache="false"
            android:fadingEdge="none" android:cacheColorHint="#00000000" />
    
    </LinearLayout>
    适配器adapter的配置文件list_adapter.xml
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent" android:layout_height="fill_parent" android:gravity="center" 
        android:orientation="horizontal">
    
        <TextView android:id="@+id/tv_zxing_section_sequence"
            android:layout_width="50dp" android:layout_height="wrap_content"
            android:textSize="16sp" />
    
        <TextView android:id="@+id/tv_zxing_sectionname"
            android:layout_width="210dp" android:layout_height="wrap_content"
            android:textSize="14sp" android:layout_marginLeft="10dp" />
            
        <CheckBox android:id="@+id/item_cb_section" android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:focusable="false"
            android:focusableInTouchMode="false" android:clickable="false"
            android:layout_alignParentTop="true" android:layout_marginLeft="5dp" />
    
    </LinearLayout>
        
    SingleListChoiceActivity.java
    
    package com.amker.test;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import android.app.Activity;
    import android.content.Context;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.view.View.OnClickListener;
    import android.widget.AdapterView;
    import android.widget.BaseAdapter;
    import android.widget.CheckBox;
    import android.widget.ListView;
    import android.widget.TextView;
    
    public class SingleListChoiceActivity extends Activity {
    
        private ListView listView;
        
        private Map<Integer, Boolean> isSelected;
        
        private List beSelectedData = new ArrayList();    
        
        ListAdapter adapter;
        
        private List cs = null;
        
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            listView = (ListView) this.findViewById(R.id.lv_single_list);
            cs  = new ArrayList();
            cs.add("aaaaaa");
            cs.add("bbbbbb");
            cs.add("cccccc");
            cs.add("dddddd");
            cs.add("eeeeee");
            cs.add("ffffff");
            cs.add("gggggg");
            cs.add("hhhhhh");
            cs.add("jjjjjj");
            
            initList();
        }
        
        void initList(){
            
            if (cs == null || cs.size() == 0)
                return;
            if (isSelected != null)
                isSelected = null;
            isSelected = new HashMap<Integer, Boolean>();
            for (int i = 0; i < cs.size(); i++) {
                isSelected.put(i, false);
            }
            // 清除已经选择的项
            if (beSelectedData.size() > 0) {
                beSelectedData.clear();
            }
            adapter = new ListAdapter(this, cs);
            listView.setAdapter(adapter);
            listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
            adapter.notifyDataSetChanged();
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                   Log.i("map", cs.get(position).toString());
                }
            });
            
        }
        
        class ListAdapter extends BaseAdapter {
    
            private Context context;
    
            private List cs;
    
            private LayoutInflater inflater;
    
            public ListAdapter(Context context, List data) {
                this.context = context;
                this.cs = data;
                initLayoutInflater();
            }
    
            void initLayoutInflater() {
                inflater = LayoutInflater.from(context);
            }
    
            public int getCount() {
                return cs.size();
            }
    
            public Object getItem(int position) {
                return cs.get(position);
            }
    
            public long getItemId(int position) {
                return 0;
            }
    
            public View getView(int position1, View convertView, ViewGroup parent) {
                ViewHolder holder = null;
                View view = null;
                final int position = position1;
                if (convertView == null) {
                    convertView = inflater.inflate(R.layout.list_adapter,
                            null);
                    holder = new ViewHolder();
                    holder.checkBox = (CheckBox) convertView
                            .findViewById(R.id.item_cb_section);
                    holder.tv_sequence = (TextView) convertView
                            .findViewById(R.id.tv_zxing_section_sequence);
                    holder.tv_sectionname = (TextView) convertView
                            .findViewById(R.id.tv_zxing_sectionname);
                    convertView.setTag(holder);
                } else {
                    view = convertView;
                    holder = (ViewHolder) view.getTag();
                }            
                holder.checkBox.setOnClickListener(new OnClickListener() {
                    public void onClick(View v) {
                        // 当前点击的CB
                        boolean cu = !isSelected.get(position);
                        // 先将所有的置为FALSE
                        for(Integer p : isSelected.keySet()) {
                            isSelected.put(p, false);
                        }
                        // 再将当前选择CB的实际状态
                        isSelected.put(position, cu);
                        ListAdapter.this.notifyDataSetChanged();
                        beSelectedData.clear();
                        if(cu) beSelectedData.add(cs.get(position));
                    }
                });
                holder.tv_sequence.setText(String.valueOf(position + 1));
                holder.tv_sectionname.setText(cs.get(position).toString());
                holder.checkBox.setChecked(isSelected.get(position));
                return convertView;
            }
        }
        
        class ViewHolder {
    
            CheckBox checkBox;
    
            TextView tv_sequence;
    
            TextView tv_sectionname;
    
        }
    }
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  • 原文地址:https://www.cnblogs.com/zhujiabin/p/5460499.html
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