Android自定义Adapter--继承于SimpleAdapter

      今天晚上做一个依据数组中元素是否为null，来设置textView的可见性，本来想用简单的用setVisibility来实现，结果好像没有什么效果，后来去看SimpleAdapter的getView()原理，发现可以bindView方法中实现这一功能，于是有了下面RemindViewAdapter类，代码基本是在SimpleAdapter中摘抄出来的。

    /**
	 * 用于RemindView里数据绑定的Adapter
	 * 
	 * @author xzz
	 * 
	 */
	public class RemindViewAdapter extends SimpleAdapter {

		/**
		 * 保存map的list,map保存数据
		 */
		private List<? extends Map<String, ?>> mData;

		/**
		 * 解析的xml资源文件id
		 */
		private int mResource;

		/**
		 * RemindViewAdapter所需的key数组
		 */
		private String[] mFrom;

		/**
		 * RemindViewAdapter所需的id数组
		 */
		private int[] mTo;

		/**
		 * 解析器
		 */
		private LayoutInflater mInflater;

		/**
		 * 有更新的内容的数量，没有更新的位置置null，
		 */
		private String[] mNewTextItem;

		/**
		 * 属兔绑定
		 */
		private ViewBinder mViewBinder;

		/**
		 * 构造方法，对实例域进行引用复制
		 * 
		 * @param context
		 * @param data
		 * @param resource
		 * @param from
		 * @param to
		 * @param newTextItem
		 * @see android.widget.SimpleAdapter
		 */
		public RemindViewAdapter(Context context,
		        List<? extends Map<String, ?>> data, int resource,
		        String[] from, int[] to, String[] newTextItem) {

			super(context, data, resource, from, to);
			mData = data;
			mResource = resource;
			mFrom = from;
			mTo = to;
			mNewTextItem = newTextItem;
			mInflater = (LayoutInflater) context
			        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		}

		/**
		 * @see android.widget.Adapter#getCount()
		 */
		public int getCount() {

			return mData.size();
		}

		/**
		 * @see android.widget.Adapter#getItem(int)
		 */
		public Object getItem(int position) {

			return mData.get(position);
		}

		/**
		 * @see android.widget.Adapter#getItemId(int)
		 */
		public long getItemId(int position) {

			return position;
		}

		/**
		 * @see android.widget.Adapter#getView(int, View, ViewGroup)
		 */
		public View getView(int position, View convertView, ViewGroup parent) {

			return createViewFromResource(position, convertView, parent,
			        mResource);
		}

		/**
		 * 
		 * 从资源文件中创建View
		 * 
		 * @param position
		 *            位置
		 * @param convertView
		 * @param parent
		 * @param resource
		 * @return
		 * @see android.widget.SimpleAdapter#createViewFromResource
		 */
		private View createViewFromResource(int position, View convertView,
		        ViewGroup parent, int resource) {

			View v;
			if (convertView == null) {
				v = mInflater.inflate(resource, parent, false);
			} else {
				v = convertView;
			}

			bindView(position, v);

			return v;
		}

		/**
		 * 主要是依据newItemText数组中是否为null，来设置R.id.newtextitem的可视性
		 * 
		 * @param position 位置
		 * @param view listView中item的View
		 * @see android.widget.SimpleAdapter#bindView
		 */
		private void bindView(int position, View view) {

			final Map<String, ?> dataSet = mData.get(position);
			if (dataSet == null) {
				return;
			}
			final ViewBinder binder = mViewBinder;
			final String[] from = mFrom;
			final int[] to = mTo;
			final int count = to.length;

			for (int i = 0; i < count; i++) {
				final View v = view.findViewById(to[i]);
				if (v != null) {
					final Object data = dataSet.get(from[i]);
					String text = data == null ? "" : data.toString();

					boolean bound = false;
					if (binder != null) {
						bound = binder.setViewValue(v, data, text);
					}

					if (!bound) {
						if (v instanceof TextView) {
							setViewText((TextView) v, text);
							if (from[i].equals(key[2])
							        && mNewTextItem[position] == null)
//在这里实现依据newItemText数组中是否为null，来设置R.id.newtextitem的可视性
//当然也可以在这个方法里实现自己定制的ListView中的Item
								v.setVisibility(View.INVISIBLE);
						} else if (v instanceof ImageView) {
							if (data instanceof Integer) {
								setViewImage((ImageView) v, (Integer) data);
							} else {
								setViewImage((ImageView) v, text);
							}
						} else {
							throw new IllegalStateException(
							        v.getClass().getName()
							                + " is not a "
							                + " view that can be bounds by this SimpleAdapter");
						}
					}
				}
			}
		}
	}