Listview getItemViewType的使用

ListView中有两个可以用来让ListView可以在视图中显示多种布局的方法,分别是getItemType和getViewTypeCount

其中

    getItemViewType返回的是有参数position所决定的的view的id
    getViewTypeCount,顾名思义,就是返回不同布局的数目

接下来我们要做的就是在getView方法中根据不同的itemType来创建正确的convertView

话不多说,先上图

       

主要代码:

Activity

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }
    
    private void initView() {
        ListView listView = (ListView) findViewById(R.id.listview);
        listView.setAdapter(new MySeparatorListAdapter(initData()));
    }
    
    private List<ListData> initData() {
        List<ListData> data = new ArrayList<MainActivity.ListData>();
        for(int i = 0; i < 30; i ++) 
            data.add(new ListData("标题:" + i, "内容:" + i, "作者:" + i));
        return data;
    }
}

 

Adapter类

class MySeparatorListAdapter extends BaseAdapter {
        private static final int TYPE_MAIN = 0;
        private static final int TYPE_SEPARATOR = 1;
        private static final int TYPE_COUNT = 2;
        
        private List<ListData> mData;
        private LayoutInflater mInflater;
  
        private TreeSet mSeparatorsSet = new TreeSet();
        
        public MySeparatorListAdapter(List<ListData> data) {
            mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            mData = data;
            setSeparator();
        }
        
        @SuppressWarnings("unchecked")
        private void setSeparator() {
            int index = 0;
            for(int i = 0, n = mData.size(); i < n; i ++) {
                if(i % 3 == 0) {
                    //保存分界位置信息
                    mSeparatorsSet.add(i + index);
                    mData.add(i + index, new ListData("分界" + index, null, null));
                    index ++;
                }
            }
            notifyDataSetChanged();
        }

        @Override
        public int getItemViewType(int position) {
            return mSeparatorsSet.contains(position) ? TYPE_SEPARATOR : TYPE_MAIN;
        }
  
        @Override
        public int getViewTypeCount() {
            return TYPE_COUNT;
        }
  
        @Override
        public int getCount() {
            return mData.size();
        }
  
        @Override
        public long getItemId(int position) {
            return position;
        }
        
        @Override
        public ListData getItem(int position) {
            return mData.get(position);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            int type = getItemViewType(position);
            if (convertView == null) {
                holder = new ViewHolder();
                switch (type) {
                    case TYPE_MAIN:
                        convertView = mInflater.inflate(R.layout.music_hot_review_item, null);
                        holder.titleView = (TextView)convertView.findViewById(R.id.music_hot_review_musicname);
                        holder.contentView = (TextView)convertView.findViewById(R.id.music_hot_review_review);
                        holder.authorView = (TextView)convertView.findViewById(R.id.music_hot_review_username);
                        break;
                    case TYPE_SEPARATOR:
                        convertView = mInflater.inflate(R.layout.separator_item, null);
                        holder.titleView = (TextView)convertView.findViewById(R.id.separetor_title);
                        break;
                }
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder)convertView.getTag();
            }
            switch (type) {
            case TYPE_MAIN:
                holder.titleView.setText(mData.get(position).getTitle().toString());
                holder.contentView.setText(mData.get(position).getContent().toString());
                holder.authorView.setText(mData.get(position).getAuthor().toString());
                break;
            case TYPE_SEPARATOR:
                holder.titleView.setText(mData.get(position).getTitle().toString());
                break;
            }
            return convertView;
        }
    }

 

xml代码:

主要布局:music_hot_review_item.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:background="@drawable/list_rect_selector"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ImageView
            android:id="@+id/music_hot_review_imageview"
            android:layout_width="70dp"
            android:layout_height="70dp"
            android:layout_marginLeft="5dp"
            android:layout_marginTop="5dp"
            android:scaleType="centerCrop"
            android:src="@drawable/music_image_default" />

        <TextView
            android:id="@+id/music_hot_review_musicname"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="5dp"
            android:layout_toRightOf="@id/music_hot_review_imageview"
            android:ellipsize="marquee"
            android:marqueeRepeatLimit="marquee_forever"
            android:singleLine="true"
            android:text="我好想你"
            android:textColor="@color/font_color"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/music_hot_review_username"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/music_hot_review_musicname"
            android:layout_marginLeft="13dp"
            android:layout_marginTop="2dp"
            android:layout_toRightOf="@id/music_hot_review_imageview"
            android:text="居来提"
            android:textColor="@color/font_color"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/music_hot_review_review"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/music_hot_review_username"
            android:layout_marginLeft="13dp"
            android:layout_marginRight="5dp"
            android:layout_marginTop="2dp"
            android:layout_toRightOf="@id/music_hot_review_imageview"
            android:paddingBottom="10dp"
            android:text="dsahdkasdh"
            android:textColor="@color/font_color"
            android:textSize="15sp" />
    </RelativeLayout>

</LinearLayout>

分界布局: separator_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="5dp" >
    
    <TextView 
        android:id="@+id/separetor_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:textSize="20sp"
        android:textColor="@color/my_green"
        android:text="分界"
        />

</RelativeLayout>

 

本文内容参考:http://www.cnblogs.com/xiaowenji/archive/2010/12/08/1900579.html

posted @ 2013-11-07 14:47  kkrimen  阅读(9203)  评论(0编辑  收藏  举报