使用ListView显示信息列表

叁歲伎倆 2022-07-16 02:48 208阅读 0赞

<?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="horizontal" >
    
        <ImageView
            android:id="@+id/pic"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher"
            android:layout_marginLeft="15dp"
             />
    
        <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView"
            android:textColor="#000000"
            android:textSize="20dp"
             />
    
    </LinearLayout>

package com.example.demo1;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import android.R.integer;
    import android.app.Activity;
    import android.content.DialogInterface.OnClickListener;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.AbsListView;
    import android.widget.AbsListView.OnScrollListener;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.ArrayAdapter;
    import android.widget.ImageButton;
    import android.widget.ListView;
    import android.widget.SimpleAdapter;
    import android.widget.SlidingDrawer;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class MainActivity extends Activity implements OnItemClickListener,OnScrollListener{
    	private ListView listView;
    	private ArrayAdapter<String> adapter;
    	private List<Map<String, Object>> list;
    	private SimpleAdapter simple_adapter;
    	 @Override
    	 protected void onCreate(Bundle savedInstanceState) {
    	  // TODO Auto-generated method stub
    	  super.onCreate(savedInstanceState);
    	  setContentView(R.layout.activity_main);
    	  listView=(ListView) findViewById(R.id.listView);
    	  //新建一个数据适配器
    	  //适配器加载数据源
    	  String[] arStrings={"guo","qing","shuang"};
    	  adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arStrings);
    	  //视图加载适配器
    	  //listView.setAdapter(adapter);//第一种
    	  list=new ArrayList<Map<String,Object>>();
    	  /*
    	   * context:上下文
    	   * data:数据源 一个Map组成的List集合，每一个Map都会去对应ListView中的一行
    	   * 每一个Map<键，值>中的键必须包含在from中所指定的键
    	   * resource:列表项的布局文件ID。
    	   * from:Map中的键名
    	   * to：绑定数据中的ID,与from形成对应的关系
    	   */
    	  //第二种
    	  simple_adapter=new SimpleAdapter(this,getData(),R.layout.item,new String[]{"pic","text"},new int[]{R.id.pic,R.id.text});
    	  listView.setAdapter(simple_adapter);
    	  listView.setOnItemClickListener(this);
    	  listView.setOnScrollListener(this);
    	}
    	 public List<Map<String,Object>> getData()
    	 {
    		 for(int i=0;i<20;i++)
    		 {
    			 Map<String, Object> map=new HashMap<String, Object>();
    			 map.put("pic",R.drawable.ic_launcher);
    			 map.put("text","guoqingshuang"+i);
    			 list.add(map);
    		 }
    		 return list;
    	 }
    	@Override
    	public void onScrollStateChanged(AbsListView view, int scrollState) {
    		// TODO Auto-generated method stub
    		switch (scrollState) {
    		case SCROLL_STATE_FLING:
    			Log.i("Main","用户在手指离开屏幕之前，由于用力划了一下，视图仍依据惯性继续滑动");
    			Map<String,Object> map=new HashMap<String,Object>();
    			map.put("pic",R.drawable.down);
    			map.put("text","你还好吗！");
    			list.add(map);
    			simple_adapter.notifyDataSetChanged();
    			break;
            case SCROLL_STATE_IDLE:
            	Log.i("Main","视图已经停止滑动");
    			break;
            case SCROLL_STATE_TOUCH_SCROLL:
            	Log.i("Main","手指没有离开屏幕，试图正在滑动");//刷新
    			break;
    		default:
    			break;
    		}
    	}
    	@Override
    	public void onScroll(AbsListView view, int firstVisibleItem,
    			int visibleItemCount, int totalItemCount) {
    		// TODO Auto-generated method stub
    		
    	}
    	@Override
    	public void onItemClick(AdapterView<?> parent, View view, int position,
    			long id) {
    		// TODO Auto-generated method stub
    		String text=listView.getItemAtPosition(position)+"";
    		Toast.makeText(this,position+"",Toast.LENGTH_SHORT).show();
    	}
    }