前言
本文實(shí)現(xiàn)的是使用ViewHolder來(lái)刷新某項(xiàng)數(shù)據(jù)，而不用每次都全部刷新數(shù)據(jù)。下面話不多說(shuō)，來(lái)看看詳細(xì)的介紹。
實(shí)現(xiàn)方法
繼承BaseAdapter，新建ViewHolder類。
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，調(diào)用updateView()方法，刷新數(shù)據(jù)。
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); //動(dòng)態(tài)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);//動(dòng)態(tài)修改 } }); } } 給出布局文件：
<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="動(dòng)態(tài)修改" android:textColor="#123456" /> </LinearLayout> <ListView android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout>
總結(jié)
以上就是這篇文章的全部?jī)?nèi)容了，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作能帶來(lái)一定的幫助，如果有疑問(wèn)大家可以留言交流。
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