Android ListView动态刷新某项Item

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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<String> strList; public TestListAdapter(Context context, List<String> 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<String> strList = new ArrayList<String>();
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 = ; i < ; 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
}
});
}
}