ListView中实现部分刷新的两种方法

ListView在开发中用到的地方非常多，我们经常是全部刷新来更新数据，如果只需要更新某一条数据，该怎么实现呢？我在项目中使用过以下两种方法：

1.通过点击的位置，获取需要刷新那一列对应的控件，然后在控件上显示新的数据。
2.通过点击的位置，在数据源上移除对应位置的数据，并且重新设置新的数据，然后刷新。

先看一下效果图

假如我们点击第二条数据里面的刷新按钮，变成下面的效果

下面我们看一下这个简单示例的代码：

public class MainActivity extends Activity {    private ListView lvMain;    private TestAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lvMain = (ListView) findViewById(R.id.mListView);        adapter = new TestAdapter(this,getDatas());        adapter.setListView(lvMain);        lvMain.setAdapter(adapter);        adapter.notifyDataSetChanged();    }    //数据源    private List<StudentBean> getDatas(){        List<StudentBean> studentList = new ArrayList<StudentBean>();        for(int i = 0;i < 6; i++){            StudentBean st = new StudentBean();            st.setName("孙悟空" + i);            st.setHobby("打妖怪 " + i);            studentList.add(st);        }        return studentList;    }}

adapter里面，主要是按钮点击后，两个方法updateItemView(position) & updateItemData(position)，一个是更新ItemView，一个是重新设置数据源来实现更新某一条数据。
这里有个地方需要注意下：View view = mListView.getChildAt(pos - mListView.getFirstVisiblePosition());，位置不要计算错。

public class TestAdapter extends BaseAdapter implements View.OnClickListener{    private Context ctx;    private List<StudentBean> studentDatas;    public TestAdapter(Context ctx, List<StudentBean> studentDatas) {        this.ctx = ctx;        this.studentDatas = studentDatas;    }    @Override    public int getCount() {        return studentDatas == null? 0 : studentDatas.size();    }    @Override    public Object getItem(int position) {        return studentDatas.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder viewHolder = null;        if(convertView == null){                        convertView = LayoutInflater.from(ctx).inflate(R.layout.adapter_main_item, parent, false);            viewHolder = new ViewHolder();            viewHolder.tvItemTitle = (TextView) convertView.findViewById(R.id.tvItemTitle);            viewHolder.tvItemContent = (TextView) convertView.findViewById(R.id.tvItemContent);            viewHolder.btnItemRefresh = (Button) convertView.findViewById(R.id.btnItemRefresh);            convertView.setTag(viewHolder);        }else{            viewHolder = (ViewHolder) convertView.getTag();        }        viewHolder.tvItemTitle.setText(studentDatas.get(position).getName());        viewHolder.tvItemContent.setText(studentDatas.get(position).getHobby());        viewHolder.btnItemRefresh.setTag(position);        viewHolder.btnItemRefresh.setOnClickListener(this);        return convertView;    }    @Override    public void onClick(View v) {        switch(v.getId()){        case R.id.btnItemRefresh:            int position = (int) v.getTag();            //更新ItemView            updateItemView(position);            //重新设置数据源来实现更新一条数据//          updateItemData(position);            break;        }    }    private void updateItemView(int pos){        if(mListView != null){            View view = mListView.getChildAt(pos - mListView.getFirstVisiblePosition());            TextView tvItemTitle = (TextView) view.findViewById(R.id.tvItemTitle);            TextView tvItemContent = (TextView) view.findViewById(R.id.tvItemContent);            StudentBean stNew = getNewDatas();            tvItemTitle.setText(stNew.getName());            tvItemContent.setText(stNew.getHobby());        }    }    private void updateItemData(int pos){        StudentBean stNew = getNewDatas();        studentDatas.remove(pos);        studentDatas.add(pos, stNew);        notifyDataSetChanged();    }    private ListView mListView;    public void setListView(ListView listView){        mListView = listView;    }    static class ViewHolder{        TextView tvItemTitle;        TextView tvItemContent;        Button btnItemRefresh;    }    private StudentBean getNewDatas(){        StudentBean st = new StudentBean();        st.setName("二狗子");        st.setHobby("打土匪");        return st;    }}

StudentBean

public class StudentBean {    private String name;    private String hobby;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getHobby() {        return hobby;    }    public void setHobby(String hobby) {        this.hobby = hobby;    }}