当用户停止滚动时，我如何在Android的listview项目中替换图像

Question

在此自定义适配器中，在我的列表视图中，只有一个imageview。我正在加载列表视图中的图像列表。我想更改该行的listview，其中用户停止滚动的图像。我怎样才能达到这个结果。提前感谢任何解决方案。

class MyAdapter extends BaseAdapter { 

    private Context context; 
    private int images[]; 

    // public boolean isScrolling; 

    public MyAdapter(Context context, int images[]) { 
     this.context = context; 
     this.images = images; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return images.length; 
    } 

    @Override 
    public Object getItem(int position) { 
     // TODO Auto-generated method stub 
     return images[position]; 
    } 

    @Override 
    public long getItemId(int position) { 
     // TODO Auto-generated method stub 
     return position; 
    } 

    class MyViewHolder { 
     ImageView imageView; 

     public MyViewHolder(View v) { 
      // TODO Auto-generated constructor stub 
      imageView = (ImageView) v.findViewById(R.id.imgView); 
     } 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     // TODO Auto-generated method stub 
     View row = convertView; 
     MyViewHolder holder = null; 
     if (row == null) { 
      LayoutInflater inflater = (LayoutInflater) context 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      row = inflater.inflate(R.layout.custom_list, parent, false); 

      holder = new MyViewHolder(row); 
      row.setTag(holder); 
     } else { 
      holder = (MyViewHolder) row.getTag(); 
      row = convertView; 
     } 
     holder.imageView.setImageResource(images[position]); 
     return row; 
    } 
} 

这里是我的MainActivity，我打电话给MyAdapter来获取图像列表。

public class MainActivity extends Activity { 

    private ListView listView; 
    private MyAdapter myAdapter; 

    int[] images = { R.drawable.img001, R.drawable.img002, R.drawable.img003, 
      R.drawable.img004, R.drawable.img005, R.drawable.img006, 
      R.drawable.img007, R.drawable.img008, R.drawable.img009, 
      R.drawable.img010, R.drawable.img011, R.drawable.img012, 
      R.drawable.img013, R.drawable.img014, R.drawable.img015, 
      R.drawable.img016, R.drawable.img017, R.drawable.img018, 
      R.drawable.img019, R.drawable.img020, R.drawable.img021, 
      R.drawable.img022, R.drawable.img023, R.drawable.img024, 
      R.drawable.img025, R.drawable.img026, R.drawable.img027, 
      R.drawable.img028, R.drawable.img029, R.drawable.img030, 
      R.drawable.img031, R.drawable.img032, R.drawable.img033, 
      R.drawable.img034, R.drawable.img035, R.drawable.img036, 
      R.drawable.img037, R.drawable.img038, R.drawable.img039, 
      R.drawable.img040, R.drawable.img041, R.drawable.img042, 
      R.drawable.img043, R.drawable.img044, R.drawable.img045, 
      R.drawable.img046, R.drawable.img047, R.drawable.img048, 
      R.drawable.img049, R.drawable.img050, R.drawable.img051, 
      R.drawable.img052, R.drawable.img053, R.drawable.img054, 
      R.drawable.img055, R.drawable.img056, R.drawable.img057, 
      R.drawable.img058, R.drawable.img059, R.drawable.img060, 
      R.drawable.img061, R.drawable.img062, R.drawable.img063, 
      R.drawable.img064, R.drawable.img065, R.drawable.img066, 
      R.drawable.img067, R.drawable.img068, R.drawable.img069, 
      R.drawable.img070, R.drawable.img071, R.drawable.img072, 
      R.drawable.img073, R.drawable.img074, R.drawable.img075, 
      R.drawable.img076, R.drawable.img077, R.drawable.img078, 
      R.drawable.img079, R.drawable.img080, R.drawable.img081, 
      R.drawable.img082, R.drawable.img083, R.drawable.img084, 
      R.drawable.img085, R.drawable.img086, R.drawable.img087, 
      R.drawable.img088, R.drawable.img089, R.drawable.img090, 
      R.drawable.img091, R.drawable.img092, R.drawable.img093, 
      R.drawable.img094, R.drawable.img095, R.drawable.img096, 
      R.drawable.img097, R.drawable.img098, R.drawable.img099, 
      R.drawable.img100 }; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main);  
     myAdapter = new MyAdapter(this, images); 
     listView = (ListView) findViewById(R.id.imgList); 
     listView.setAdapter(myAdapter); 
    } 
    } 

Answer 1

尝试使用setOnScrollListener()和onScrollStateChanged与scrollState == SCROLL_STATE_IDLE 实现，现在你有firstVisibleItem，visibleItemCount，totalItemCount

setOnScrollListener(new OnScrollListener(){ 
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { 
    // TODO Auto-generated method stub 
} 
public void onScrollStateChanged(AbsListView view, int scrollState) { 
    // TODO Auto-generated method stub 
    if(scrollState == SCROLL_STATE_IDLE){ 
    Log.i("a", "scrolling stopped..."); 
} 
    }); 
}