Android在listview添加checkbox实现

主界面CheckBoxinListViewActivity.java代码如下：

public class CheckBoxinListViewActivity extends Activity {
  /** Called when the activity is first created. */
        
        private MyAdapter adapter;
        private ListView listview;
        private Button checkAll;
        private Button noCheckAll;
        
        
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listview = (ListView)findViewById(R.id.listview);
        checkAll = (Button)findViewById(R.id.button1);
        noCheckAll = (Button)findViewById(R.id.button2);
        adapter = new MyAdapter();
        listview.setAdapter(adapter);
        checkAll.setOnClickListener(new OnClickListener() {
                        
                        @Override
                        public void onClick(View v) {
                                adapter.checkAll();
                        }
                });
        noCheckAll.setOnClickListener(new OnClickListener() {
                        
                        @Override
                        public void onClick(View v) {
                                adapter.noCheckAll();
                        }
                });
        
    }
    
    
    
    private class MyAdapter extends BaseAdapter{
            
            private ArrayList<Message> list= new ArrayList<Message>();
            
            public MyAdapter(){
                    for(int i = 1 ;i<=100 ; i++){
                            list.add(new Message("item_"+i));
                    }
            }
            
            public void checkAll(){
                    for(Message msg:list){
                            msg.isCheck = true;
                    }
                    notifyDataSetChanged();
            }
            public void noCheckAll(){
                    for(Message msg:list){
                            msg.isCheck = false;
                    }
                    notifyDataSetChanged();
            }

                @Override
                public int getCount() {
                        return list.size();
                }

                @Override
                public Object getItem(int position) {
                        return null;
                }

                @Override
                public long getItemId(int position) {
                        return 0;
                }

                @Override
                public View getView(int position, View convertView, ViewGroup parent) {
                        ViewHolder viewHolder;
                        if(convertView == null){
                                LayoutInflater inflater = LayoutInflater.from(CheckBoxinListViewActivity.this);
                                convertView = inflater.inflate(R.layout.listview_item, null);
                                viewHolder = new ViewHolder();
                                viewHolder.checkBox = (CheckBox)convertView.findViewById(R.id.checkBox1);
                                convertView.setTag(viewHolder);
                        }else{
                                viewHolder = (ViewHolder)convertView.getTag();
                        }
                        final Message msg = list.get(position);
                        viewHolder.checkBox.setText(msg.str);
                        viewHolder.checkBox.setChecked(msg.isCheck);
                        //注意这里设置的不是onCheckedChangListener，还是值得思考一下的
                        viewHolder.checkBox.setOnClickListener(new OnClickListener() {
                                
                                @Override
                                public void onClick(View v) {
                                        if(msg.isCheck){
                                                msg.isCheck = false;
                                        }else{
                                                msg.isCheck = true;
                                        }
                                        
                                }
                        });
                        return convertView;
                }
            
    }
    private class ViewHolder{
            CheckBox checkBox;
    }
}

适配器所适配的消息Message.java如下：

public class Message {
        public boolean isCheck;
        public String str;
        public Message(String str){
                this.str = str;
        }
}

main.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
        <Button android:text="全选" android:id="@+id/button1"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
    <Button android:text="撤消" android:id="@+id/button2"
        android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
    </LinearLayout>
    <ListView android:id="@+id/listview" android:layout_height="fill_parent"
        android:layout_width="fill_parent" />
    
</LinearLayout>

listview_item.xml代码如下：

<?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="wrap_content"
    android:descendantFocusability="blocksDescendants"
    >
<LinearLayout 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center">
<CheckBox 
    android:text="CheckBox" 
    android:id="@+id/checkBox1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>