An_ListView 多样展示

MyApplication类：加载ImageLoader的实现
！！！！别忘了加权限和
在清单里加上MyApplication：

         android:name="com.example.listview_3item.MyApplication"        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >

package com.example.listview_3item;import com.nostra13.universalimageloader.core.DisplayImageOptions;import com.nostra13.universalimageloader.core.DisplayImageOptions.Builder;import com.nostra13.universalimageloader.core.ImageLoader;import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;import android.app.Application;public class MyApplication extends Application{@Overridepublic void onCreate() {    // TODO Auto-generated method stub    DisplayImageOptions options = new DisplayImageOptions.Builder()    .showImageOnLoading(R.drawable.ic_launcher)    .displayer(new FadeInBitmapDisplayer(3000))    .build();    ImageLoaderConfiguration config = ImageLoaderConfiguration.createDefault(this);    ImageLoader.getInstance().init(config);    super.onCreate();

MainActivity 加载图片放到listview

package com.example.listview_3item;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.util.ArrayList;import java.util.List;import com.example.listview_3item.bean.Max;import com.example.listview_3item.bean.news;import com.google.gson.Gson;import com.nostra13.universalimageloader.core.ImageLoader;import android.os.AsyncTask;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.ListView;public class MainActivity extends Activity {List list;private MyAdapter myAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ListView lv=(ListView) findViewById(R.id.lv);        getData();        myAdapter = new MyAdapter();        lv.setAdapter(myAdapter);    }    private void getData() {        // TODO Auto-generated method stub        new AsyncTask() {            @Override            protected String doInBackground(String... params) {                // TODO Auto-generated method stub                initData();                return null;            }            @Override            protected void onPostExecute(String result) {                // TODO Auto-generated method stub                myAdapter.notifyDataSetChanged();                super.onPostExecute(result);            }        }.execute();    }    protected void initData() {        // TODO Auto-generated method stub        try {            URL url = new URL("http://169.254.122.215:8080/day10/news.json");            HttpURLConnection conn=(HttpURLConnection) url.openConnection();            int code = conn.getResponseCode();            if(code==200){                Gson gson = new Gson();                Max m = gson.fromJson(new InputStreamReader(conn.getInputStream(),"GBK"), Max.class);                list=new ArrayList();                list=m.getData();            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }        class MyAdapter extends BaseAdapter{        public static final int TPONE=0;        public static final int TPTWO=1;        public static final int TPTHREE=2;                @Override        public int getCount() {            // TODO Auto-generated method stub            if(list!=null){                return list.size();            }            return 0;        }                //在使用多条目加载的时候    返回当前position对应的类型        //************必须满足的条件   getItemViewType的返回值  必须要小于getViewTypeCount的返回值        @Override        public int getItemViewType(int position) {            // TODO Auto-generated method stub            if(list.get(position).getType()==10001){                return TPONE;            }else if(list.get(position).getType()==10002){                return TPTWO;            }else {                return TPTHREE;            }                    }        //使用多条目加载时   一共有几种类型        //从写该方法后，listview控件会知道  当前的布局样式不止一种          //所以 当ListView发现convertview在复用时  类型不配不上时  会重写让convertView加载一遍布局        @Override        public int getViewTypeCount() {            // TODO Auto-generated method stub            return 3;        }        @Override        public Object getItem(int position) {            // TODO Auto-generated method stub            return null;        }        @Override        public long getItemId(int position) {            // TODO Auto-generated method stub            return 0;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            // TODO Auto-generated method stub            ViewHolder0 holder0=null;            ViewHolder1 holder1=null;            ViewHolder2 holder2=null;            int type=getItemViewType(position);            if(convertView==null){                if(type==TPONE){                    convertView=View.inflate(MainActivity.this, R.layout.item0,null);                    holder0=new ViewHolder0();                    holder0.ivleft=(ImageView) convertView.findViewById(R.id.ivleft);                    convertView.setTag(holder0);                }else if(type==TPTWO){                    convertView=View.inflate(MainActivity.this, R.layout.item1,null);                    holder1=new ViewHolder1();                    holder1.ivm=(ImageView) convertView.findViewById(R.id.ivm);                    convertView.setTag(holder1);                }else{                    convertView=View.inflate(MainActivity.this, R.layout.item2,null);                    holder2=new ViewHolder2();                    holder2.ivright=(ImageView) convertView.findViewById(R.id.ivright);                    convertView.setTag(holder2);                }            }else{                if(type==TPONE){                    holder0=(ViewHolder0) convertView.getTag();                }else if(type==TPTWO){                    holder1=(ViewHolder1) convertView.getTag();                }else if(type==TPTHREE){                    holder2=(ViewHolder2) convertView.getTag();                }            }            if(type==TPONE){                ImageLoader.getInstance().displayImage(list.get(position).getPic_url(), holder0.ivleft);            }else if(type==TPTWO){                ImageLoader.getInstance().displayImage(list.get(position).getPic_url(), holder1.ivm);            }else if(type==TPTHREE){                ImageLoader.getInstance().displayImage(list.get(position).getPic_url(), holder2.ivright);            }            return convertView;        }            }    static class ViewHolder0{        ImageView ivleft;    }    static class ViewHolder1{        ImageView ivm;    }    static class ViewHolder2{        ImageView ivright;    }        }

布局 item0

<?xml version="1.0" encoding="utf-8"?>

布局 item1

<?xml version="1.0" encoding="utf-8"?>

布局 item2

<?xml version="1.0" encoding="utf-8"?>

}
}

更多相关文章

随机推荐