ListView使用详解

在android开发中ListView控件应该是使用最频繁的控件之一,ListView可以设置其各种属性从而达到特定的UI效果,下面我们就来熟悉ListView的各种属性以及使用方法。首先写一下ListView的属性,

下面代码是我做一个项目时所设置ListView的属性:

    <ListView 
	    android:id="@+id/memberList"
	    android:layout_width="match_parent"
	    android:layout_height="match_parent"
	    android:divider="@color/color_dark_grey"				       
	    android:dividerHeight="1dip"
	    android:scrollingCache="true"
            android:cacheColorHint="#00000000"
            android:fastScrollEnabled="true"
            android:focusable="true">
    </ListView>


一:divider

该属性是用于设置每个Item之间的间隔,这个间隔可以是张图片也可以是用某种颜色填充的特定高度的间隔,我上面的代码就是用颜色填充的高度为1dip的间

如果想去除这个间隔,只需要设置为:android:divider="@drawable/@null"就行。

二:srollingCache

该属性为滚动条缓存,当设置为ture时,假如你的ListView总共要加载20项Item,但是只有5项是可见的,android就会自动帮你缓存你后面即将显示的3个或多

Item,当你向想滚动的同时android又自动会帮你缓存几个显示过的Item。下面是StackOverflow 上对该属性的解释:

三:cacheColorHint

该属性为设置ListView的背景颜色,正常我们点击ListView时其默认显示的颜色为黄色,但是有时候为了整体的界面风格需要设置其背景颜色,比如微信的

整个背景颜色就是绿色的,阿里旺旺就是深蓝色的。你只需设置 android:cacheColorHint="#ff4e31"即可,我上面的代码其背景颜色是用图片作为背景的,只

需将其设置成透明的即可:android:cacheColorHint="#00000000",然后再在Item的布局文件中将其背景设置成特定的图片就行。注意的是我们设置ListView

的背景图片,但是如果不设置此属性的话,滚动的时候还是会为原来的颜色的。

四:fadeScrollbars

该属性为设置ListView滚动条的动隐藏,android:fadeScrollbars="true" 时在ListView滚动时可以进行自动隐藏

五:stackFormBottom

该属性为设置ListView的显示位置,如果设置为true时,ListView就会显示最下面的几个Item

六:trainScriptMode

该属性为设置ListView的自动滚动效果,如果你想显示ListView的最新Item时,android:transcriptMode="alwaysScroll" 这样设置即可,然后设置ListView要

显示的位置,ListView就会自动滚动到要显示的位置

七:fadingedge

当ListView上下有黑影时,只需设置:android:fadingEdge="none"就行

ListView的属性就介绍到这里,下面介绍ListView的使用方法:

我一般习惯使用BaseAdapter作为ListView的适配器,下面就介绍ListView中BaseAdapter的使用方法,看代码:

public class ContactListAdapter extends BaseAdapter{
	Context context;
	ImportFriendsTask friend; 
	List<Friend> list;
	List<View> viewList = new ArrayList<View>();
	public ContactListAdapter(Context context){
		this.context = context;
		friend=new ImportFriendsTask(context);
		list =friend.loadContacts();
	}	
	public List<Friend> getImportFriendsTask(){
		return list;
	}
	@Override
	public int getCount() {
		return list.size();
	}

	@Override
	public Object getItem(int position) {
		return position;
	}
	@Override
	public long getItemId(int position) {
		return position;
	}
	public List<View> receiveView(){
		return viewList;
	}
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		if(convertView==null){
			LinearLayout ll = (LinearLayout)LayoutInflater.from(context).inflate(R.layout.mylist, null);
			TextView name = (TextView)ll.findViewById(R.id.name);
			TextView telephone =(TextView)ll.findViewById(R.id.telephone);
			name.setText(list.get(position).getName().toString());
			telephone.setText(list.get(position).getPhone().toString());
			
			convertView=ll;
			Viewhold hold = new Viewhold();
			hold.name=name;
			hold.telephone=telephone;
			convertView.setTag(hold);
			viewList.add(convertView);
		}else{
			Viewhold hold = (Viewhold)convertView.getTag();
			hold.name.setText(list.get(position).getName().toString());
			hold.telephone.setText(list.get(position).getPhone().toString());
			viewList.add(convertView);
		}
		return convertView;
	}
}

class Viewhold{
	TextView name;
	TextView telephone;
	public TextView getName() {
		return name;
	}
	public void setName(TextView name) {
		this.name = name;
	}
	public TextView getTelephone() {
		return telephone;
	}
	public void setTelephone(TextView telephone) {
		this.telephone = telephone;
	}	
}

然后显示监听

	list = (ListView)findViewById(R.id.listView1);    
        adapter = new ContactListAdapter(this);
        list.setAdapter(adapter);        
        list.setOnItemClickListener(this);

其实还有另外一种监听方法:自定义监听接口,然后回调。

	public void setOnItemClickListener(OnItemClickListener listener) {
		mOnItemClickListener = listener;
	}
	/**
	 * 重新定义菜单选项单击接口
	 */
	public interface OnItemClickListener {
		public void onItemClick(View view, int position);
	}
	
	private void init() {
		onClickListener = new OnClickListener() {
			@Override
			public void onClick(View view) {
				selectedPos = (Integer)view.getTag();
				Log.i("GroupAdapter:", selectedPos+"GroupAdapter:onClick开始监听");
				setSelectedPosition(selectedPos);
				if (mOnItemClickListener != null){
					mOnItemClickListener.onItemClick(view, selectedPos);
					Log.i("GroupAdapter:", "GroupAdapter:mOnItemClickListener.onItemClick");
				}
				Log.i("GroupAdapter:", "GroupAdapter:onClick结束监听");
			}
		};
	}
	
	/**
	 * 设置选中的position,并通知列表刷新
	 */
	public void setSelectedPosition(int pos){
		if (groupList != null && pos< groupList.size()){
			selectedPos = pos;
			selectedText = groupList.get(pos);
			notifyDataSetChanged();
		}
	}
}
	private void init(){
		LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		inflater.inflate(R.layout.view_distance, this, true);
		setBackgroundDrawable(getResources().getDrawable(R.drawable.choosearea_bg_mid));
		listView = (ListView) findViewById(R.id.listView);
		adapter = new GroupAdapter(groupList, context);
		listView.setAdapter(adapter);
		
		adapter.setOnItemClickListener(itemClickListener());
	}
	
	private GroupAdapter.OnItemClickListener itemClickListener(){
		GroupAdapter.OnItemClickListener go = new OnItemClickListener() {			
			@Override
			public void onItemClick(View view, int position) {
				if (mOnSelectListener != null){
					showText = groupList.get(position);
					mOnSelectListener.getValue(String.valueOf(position+1), groupList.get(position));
					Log.i("ViewGroup:", "ViewGroup:"+showText);
				}
			}
		};
		
		return go;
	}



private void init(){
		LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		inflater.inflate(R.layout.view_distance, this, true);
		setBackgroundDrawable(getResources().getDrawable(R.drawable.choosearea_bg_mid));
		listView = (ListView) findViewById(R.id.listView);
		adapter = new GroupAdapter(groupList, context);
		listView.setAdapter(adapter);
		
		adapter.setOnItemClickListener(itemClickListener());
	}
	
	private GroupAdapter.OnItemClickListener itemClickListener(){
		GroupAdapter.OnItemClickListener go = new OnItemClickListener() {			
			@Override
			public void onItemClick(View view, int position) {
				if (mOnSelectListener != null){
					showText = groupList.get(position);
					mOnSelectListener.getValue(String.valueOf(position+1), groupList.get(position));
					Log.i("ViewGroup:", "ViewGroup:"+showText);
				}
			}
		};
		
		return go;
	}


 


	public void setOnItemClickListener(OnItemClickListener listener) {
		mOnItemClickListener = listener;
	}
	/**
	 * 重新定义菜单选项单击接口
	 */
	public interface OnItemClickListener {
		public void onItemClick(View view, int position);
	}
	
	private void init() {
		onClickListener = new OnClickListener() {
			@Override
			public void onClick(View view) {
				selectedPos = (Integer)view.getTag();
				Log.i("GroupAdapter:", selectedPos+"GroupAdapter:onClick开始监听");
				setSelectedPosition(selectedPos);
				if (mOnItemClickListener != null){
					mOnItemClickListener.onItemClick(view, selectedPos);
					Log.i("GroupAdapter:", "GroupAdapter:mOnItemClickListener.onItemClick");
				}
				Log.i("GroupAdapter:", "GroupAdapter:onClick结束监听");
			}
		};
	}
	
	/**
	 * 设置选中的position,并通知列表刷新
	 */
	public void setSelectedPosition(int pos){
		if (groupList != null && pos< groupList.size()){
			selectedPos = pos;
			selectedText = groupList.get(pos);
			notifyDataSetChanged();
		}
	}
}


     
 

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