Android ListView动态刷新某项Item

【Android ListView动态刷新某项Item】落花踏尽游何处，笑入胡姬酒肆中。这篇文章主要讲述Android ListView动态刷新某项Item相关的知识，希望能为你提供帮助。
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 = 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：

< LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#FFFFFF" android:orientation="vertical" > < LinearLayout android:layout_width="match_parent" android:layout_height="40dp" android:orientation="horizontal" > < EditText android:id="@+id/edittext_id" android:layout_width="200dp" android:layout_height="wrap_content" android:hint="put modify id" /> < TextView android:id="@+id/textview_modify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="动态修改" android:textColor="#123456" /> < /LinearLayout> < ListView android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="wrap_content" > < /ListView> < /LinearLayout>