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  • android适配器及监听点击和滚动在ListView中的使用

    package com.example.demon08;

    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;

    import android.support.v7.app.ActionBarActivity;
    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.ListView;
    import android.widget.SimpleAdapter;
    import android.widget.Toast;


    public class MainActivity extends ActionBarActivity implements OnItemClickListener,OnScrollListener{

    private ListView listView;
    private ArrayAdapter<String> arr_adapter;
    private SimpleAdapter simp_adapter;
    private List<Map<String,Object>>dataList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    listView=(ListView) findViewById(R.id.listView);
    //新建一个适配器
    //ArrayAdapter(上下文,当前listView加载的每一个列表项所对应的布局文件,数据源)
    //适配器加载数据源
    String[]arr_data={"战斗暴龙兽","机械暴龙兽","丧尸暴龙兽","暴龙兽","亚古兽","滚球兽"};
    arr_adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,arr_data);
    //SimpleAdapter
    //上下文
    //数据源List<? extends Map<String, ?>> data一个Map所组成List集合,
    //每一个Map都会去对应ListView列表中的一行
    //每一个Map(键-值对)中的键必须包含所有在from中指定的键
    //resource:列表项的布局文件ID
    //from:Map中的键名
    //绑定数据视图中的ID,与from成对应关系
    dataList=new ArrayList<Map<String,Object>>();
    simp_adapter=new SimpleAdapter(this,getData(),R.layout.item,new String[]{"pic","text"},new int[]{R.id.pic,R.id.text});
    //视图加载适配器
    //listView.setAdapter(arr_adapter);
    listView.setAdapter(simp_adapter);
    listView.setOnItemClickListener(this);
    listView.setOnScrollListener(this);
    }


    private 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","刀冲"+i);
    dataList.add(map);
    }

    return dataList;
    }


    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
    int visibleItemCount, int totalItemCount) {
    // TODO Auto-generated method stub

    }


    @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,由于用力滑了一下,视图仍依靠惯性继续滑动");
    Map<String,Object>map=new HashMap<String,Object>();
    map.put("pic",R.drawable.ic_launcher);
    map.put("text","增加项");
    dataList.add(map);
    simp_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,视图正在滑动");
    break;
    }
    }


    @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="+position+" text="+text,Toast.LENGTH_SHORT).show();
    }

    }

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  • 原文地址:https://www.cnblogs.com/daochong/p/4908901.html
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