使用ViewHolder来刷新某项数据，而不用每次都全部刷新数据。

继承BaseAdapter，新建ViewHolder类。

public class TestListAdapter extends BaseAdapter {    private Context mContext;    private List
     
       strList;    public TestListAdapter(Context context, List
      
        list) {        super();        this.mContext = context;        this.strList = list;    }    @Override    public int getCount() {        // TODO Auto-generated method stub        return strList.size();    }    @Override    public Object getItem(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public long getItemId(int position) {        // TODO Auto-generated method stub        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        // TODO Auto-generated method stub        ViewHolder holder = null;        if (null == convertView) {            convertView = LayoutInflater.from(mContext).inflate(R.layout.line, null);            holder = new ViewHolder();            holder.iDText = (TextView) convertView.findViewById(R.id.textView_id);            holder.strText = (TextView) convertView.findViewById(R.id.textView_str);            convertView.setTag(holder);        } else {            holder = (ViewHolder) convertView.getTag();        }        holder.iDText.setText(position + "");        String str = strList.get(position);        holder.strText.setText(str);        return convertView;    }    private static class ViewHolder {        private TextView iDText;        private TextView strText;    }    public void updataView(int posi, ListView listView) {        int visibleFirstPosi = listView.getFirstVisiblePosition();        int visibleLastPosi = listView.getLastVisiblePosition();        if (posi >= visibleFirstPosi && posi <= visibleLastPosi) {            View view = listView.getChildAt(posi - visibleFirstPosi);            ViewHolder holder = (ViewHolder) view.getTag();            String txt = holder.strText.getText().toString();            txt = txt + "++;";            holder.strText.setText(txt);            strList.set(posi, txt);        } else {            String txt = strList.get(posi);            txt = txt + "++;";            strList.set(posi, txt);        }    }}
      
     

在Activity中，调用updateView()方法，刷新数据。

public class MainActivity extends Activity {    private MainActivity mContext;    private EditText idEdit;    private TextView textView;    private List
     
       strList = new ArrayList
      
       ();    private ListView listView;    private TestListAdapter ListAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mContext = this;        for (int i = 0; i < 100; i++) {            strList.add("test data");        }        idEdit = (EditText) findViewById(R.id.edittext_id);        textView = (TextView) findViewById(R.id.textview_modify);        listView = (ListView) findViewById(R.id.listview);        ListAdapter = new TestListAdapter(mContext, strList);        listView.setAdapter(ListAdapter);        //动态刷新        textView.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                // TODO Auto-generated method stub                String idStr = idEdit.getText().toString();                int idInt = Integer.parseInt(idStr);                ListAdapter.updataView(idInt, listView);//动态修改            }        });    }}
      
     

给出布局文件：