android BaseAdapter例子

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public class ListTestActivity extends Activity {    ListView mListView;    Map<Integer, String> mMapContent;        /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)     {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                mMapContent = new HashMap<Integer, String>();                mListView = (ListView)findViewById(R.id.listview);        mListView.setAdapter(new MyListAdapter(this, 20));    }        class MyListAdapter extends BaseAdapter    {        int mCount;        Context mContext;                public MyListAdapter(Context context, int count)        {            mCount = count;            mContext = context;        }                public int getCount()        {            return mCount;        }        public Object getItem(int arg0)        {            return arg0;        }        public long getItemId(int arg0)        {            return arg0;        }        public View getView(int position, View convertView, ViewGroup arg2)        {            ViewHold holder = null;            if(convertView == null)            {            convertView = LinearLayout.inflate(mContext, R.layout.list_item, null);                holder = new ViewHold(convertView);                convertView.setTag(holder);            }            else            {                holder = (ViewHold)convertView.getTag();            }                        holder.position = position;            holder.textView.setText("listitem" + position + ":");            holder.editText.setText(mMapContent.get(position));//Integer.valueOf(position)                        return convertView;        }                class ViewHold        {            TextView textView;            EditText editText;            int position;                        public ViewHold(View v)            {                textView = (TextView)v.findViewById(R.id.textview);                editText = (EditText)v.findViewById(R.id.edittext);                                editText.addTextChangedListener(new TextWatcher()                {                    public void onTextChanged(CharSequence s, int start, int before, int count)                    {                    }                                        public void beforeTextChanged(CharSequence s, int start, int count, int after)                    {                    }                                        public void afterTextChanged(Editable s)                    {                        mMapContent.put(position, s.toString());                    }                });            }        }    }}
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