android中怎么实现Gallery长按删除所选图片的功能，请大神指点

[高大上的阿亮]

现在可以通过position获取当前长按的Gallery，显示是用的自定义的adapter
static class GridViewAdapter extends BaseAdapter {
// 存放各个元素
private List<ViewItem> listItem = new ArrayList<ViewItem>();
Context cont;
// 将一个xml文件转化成视图
//LayoutInflater inFlater;

public GridViewAdapter(Context context) {
cont = context;
//this.inFlater = LayoutInflater.from(context);
}

public void addItem(String text, Bitmap bmp, int status) {
ViewItem vi1 = new ViewItem();
vi1.setName(text);
vi1.setImg(bmp);
vi1.setStatus(status);
listItem.add(vi1);
}

public int getCount() {
return listItem.size(); //Integer.MAX_VALUE;
}

public Object getItem(int arg0) {
return arg0;
}

public long getItemId(int arg0) {
return arg0;
}

public View getView(int arg0, View arg1, ViewGroup arg2) {
View view = View.inflate(cont, R.layout.gv_item, null);
TextView tv = (TextView) view.findViewById(R.id.gv_item_appname);
ImageView iv = (ImageView) view.findViewById(R.id.gv_item_icon);

if (listItem.size() == 0) return null;

tv.setText(listItem.get(arg0 % listItem.size()).getName());
iv.setImageBitmap(listItem.get(arg0 % listItem.size()).getImg());

if (listItem.get(arg0 % listItem.size()).getStatus() != 0) {
tv.setTextColor(Color.RED);
tv.setText(listItem.get(arg0 % listItem.size()).getName() + "(报警中)");
}
//if(arg0%listItem.size() == 0) tv.setTextColor(Color.RED); // 红色标志为第一个元素

return view;
}
}

//Gallery长按删除所选图片
mGalleryCadImage.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int position, long l) {
// TODO Auto-generated method stub
new AlertDialog.Builder(AddMarkActivity.this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("温馨提示")
.setMessage("您真的要删除编号为"+position+"的图片吗")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {

}
})
.setNegativeButton("取消", null)
.show();
return true;
}
});