自定义ListView item包含checkbox实现单选和多选

最新推荐文章于 2016-03-03 21:20:11 发布

lilysea2012

最新推荐文章于 2016-03-03 21:20:11 发布

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分类专栏： Android 4.2学习笔记文章标签： listview CheckBox 单选多选

本文链接：https://blog.youkuaiyun.com/LilySea2012/article/details/8816248

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本文介绍如何在自定义ListView的每个item中包含一个TextView和一个Checkbox，通过设置单选或多选逻辑。主要涉及在XML中屏蔽Checkbox，以及在Java代码中利用OnCheckedChangeListener保存选中状态，对比当前位置，实现单选效果。参考了优快云上的相关教程。

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CheckBox本为复选框,仍然可以当单选框用

自定义ListView item中包含一个textview 和checkbox,checkbox选中级别高于item,故在xml中进行屏蔽

单选方法:(该方法同样适用于radiobutton)

main.xml

<?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"
    android:orientation="vertical" 
    >
       <ImageView
        android:id="@+id/img"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"    
        android:src="@drawable/triangle16blue"/>

    <ListView
        android:id="@+id/lvGroup"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/downbutton_corner"/>

</LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/item_tv"
        android:textSize="18sp"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="center_vertical" />
    <CheckBox 
        android:id="@+id/item_cb"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:clickable="false"
        android:focusableInTouchMode="false"
        android:gravity="center_vertical"/>

</LinearLayout>

MainActivity.java

		
		public class MainActivity extends Activity {
		    private static final String TAG = "MainActivity";
		    private ListView listView;
		    private ArrayList<String> groups;
		    @Override
		    public void onCreate(Bundle savedInstanceState) {
		        super.onCreate(savedInstanceState);
		        setContentView(R.layout.main);
		        listView = (ListView) this.findViewById(R.id.list);
		        groups = new ArrayList<String>();
						groups.add("11");
						groups.add("22");
						groups.add("33");
						groups.add("44");
						groups.add("55");
						groups.add("66");
						groups.add("77");
		        GroupAdapter adapter = new GroupAdapter(this,groups);
		        listView.setAdapter(adapter);
		        listView.setOnItemClickListener(listItemClickListener);
		        OnItemClickListener listItemClickListener=new OnItemClickListener() {

					@Override
					public void onItemClick(AdapterView<?> parent, View view, int position,
							long id) {
						 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤  
						ViewHolder viewHolder=(ViewHolder)view.getTag();						
						viewHolder.cb.toggle();// 把CheckBox的选中状态改为当前状态的反,gridview确保是单一选中
					}
				};
		    } 
      }
}

GroupAdapter.java

public class GroupAdapter extends BaseAdapter {
	private Activity activity;//上下文
	private ArrayList<String> list;
	
	private LayoutInflater inflater=null;//导入布局
	private int temp=-1;
	
	public GroupAdapter(Activity context, ArrayList<String> list) {
		this.activity = context;
		this.list = list;
		inflater=LayoutInflater.from(context);
		
	}

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

	@Override
	public Object getItem(int position) {
		
		return list.get(position);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}
    //listview每显示一行数据,该函数就执行一次
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder=null;  
		if (convertView==null) {//当第一次加载ListView控件时  convertView为空
			convertView=inflater.inflate(R.layout.group_item_view, null);//所以当ListView控件没有滑动时都会执行这条语句
			holder=new ViewHolder();
			holder.tv=(TextView)convertView.findViewById(R.id.item_tv);
			holder.cb=(CheckBox)convertView.findViewById(R.id.item_cb);
			convertView.setTag(holder);//为view设置标签
					 
		}
		else{//取出holder
			holder=(ViewHolder) convertView.getTag();//the Object stored in this view as a tag
		}
		//设置list的textview显示
		holder.tv.setTextColor(Color.WHITE);
		holder.tv.setText(list.get(position));
		// 根据isSelected来设置checkbox的选中状况
		
		holder.cb.setId(position);//对checkbox的id进行重新设置为当前的position
		holder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
			//把上次被选中的checkbox设为false
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
				if(isChecked){//实现checkbox的单选功能,同样适用于radiobutton
					if(temp!=-1){
						//找到上次点击的checkbox,并把它设置为false,对重新选择时可以将以前的关掉
						CheckBox tempCheckBox=(CheckBox)activity.findViewById(temp);
						if(tempCheckBox!=null)
							tempCheckBox.setChecked(false);
					}
					temp=buttonView.getId();//保存当前选中的checkbox的id值		
				}
			}
		});
		//System.out.println("temp:"+temp);
		//System.out.println("position:"+position);
		if(position==temp)//比对position和当前的temp是否一致
			holder.cb.setChecked(true);
		else 
			holder.cb.setChecked(false);
		return convertView;
	}
	static class ViewHolder {
		TextView tv;
		CheckBox cb;
	}
}

listview checkbox实现多选框

MainAcitvity.java

public class MainActivity extends Activity {
    private static final String TAG = "MainActivity";
    private ListView listView;
    private ArrayList<String> groups;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listView = (ListView) this.findViewById(R.id.list);
        groups = new ArrayList<String>();
				groups.add("11");
				groups.add("22");
				groups.add("33");
				groups.add("44");
				groups.add("55");
				groups.add("66");
				groups.add("77");
        GroupAdapter adapter = new GroupAdapter(this,groups);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(listItemClickListener);
        OnItemClickListener listItemClickListener=new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,
					long id) {
				 取得ViewHolder对象，这样就省去了通过层层的findViewById去实例化我们需要的cb实例的步骤  
				ViewHolder viewHolder=(ViewHolder)view.getTag();						
				viewHolder.cb.toggle();// 把CheckBox的选中状态改为当前状态的反,gridview确保是单一选中
				GroupAdapter.getIsSelected().put(position, viewHolder.cb.isChecked());//将CheckBox的选中状况记录下来 
			}
		};
    } 
 }

GroupAdapter.java

public class GroupAdapter extends BaseAdapter {
	private Context context;//上下文
	private ArrayList<String> list;
	//控制CheckBox选中情况
	private static HashMap<Integer,Boolean> isSelected;
	private LayoutInflater inflater=null;//导入布局
	
	
	public GroupAdapter(Context context, ArrayList<String> list) {
		this.context = context;
		this.list = list;
		inflater=LayoutInflater.from(context);
		isSelected=new HashMap<Integer, Boolean>();
		initData();
	}
	private void initData(){//初始化isSelected的数据
		for(int i=0;i<list.size();i++){
			getIsSelected().put(i,false);
			
		}	
	}

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

	@Override
	public Object getItem(int position) {
		
		return list.get(position);
	}

	@Override
	public long getItemId(int position) {
		// TODO Auto-generated method stub
		return position;
	}
    //listview每显示一行数据,该函数就执行一次
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder=null;  
		if (convertView==null) {//当第一次加载ListView控件时  convertView为空
			convertView=inflater.inflate(R.layout.group_item_view, null);//所以当ListView控件没有滑动时都会执行这条语句
			holder=new ViewHolder();
			holder.tv=(TextView)convertView.findViewById(R.id.item_tv);
			holder.cb=(CheckBox)convertView.findViewById(R.id.item_cb);
			convertView.setTag(holder);//为view设置标签
					 
		}
		else{//取出holder
			holder=(ViewHolder) convertView.getTag();//the Object stored in this view as a tag
		}
		//设置list的textview显示
		holder.tv.setTextColor(Color.WHITE);
		holder.tv.setText(list.get(position));
		// 根据isSelected来设置checkbox的选中状况
		holder.cb.setChecked(getIsSelected().get(position));	
		return convertView;
	}
	static class ViewHolder {
		TextView tv;
		CheckBox cb;
	}
	public static HashMap<Integer, Boolean>getIsSelected(){
		return isSelected;
	}
	public static void setIsSelected(HashMap<Integer, Boolean> isSelected){
		GroupAdapter.isSelected=isSelected;
	}

}

其中,getview负责显示每一行listview item,每显示一行就执行一次getview,

若要单选,必须保存当前选中的checkbox的position值,与listview 的每一个item的position进行比较,相同时才设置checkbox ischeck=true;

只有checkbox的setOnCheckChangeListener可以做到这点,保存上一次点击的position值,对checkbox的id值重新设置.temp保存该id值.

getview负责显示数据,onitemselectedlistener负责发送消息,提取数据,处理数据
参考:http://blog.youkuaiyun.com/notice520/article/details/7266896

http://blog.youkuaiyun.com/jdsjlzx/article/details/6969405

http://www.devdiv.com/forum.php?mod=viewthread&tid=85251