Android中ListView與CheckBox結合----多選與記錄
很多時候我們會用到ListView與CheckBox結合的東西,比如一個清單,可以用來多選,但是很多人似乎也在這個地方遇到很多問題,我剛開始學的時候也是遇到假選問題,當列表中數量多的之后,我勾選一個,滑動頁面會發現條目也勾選上了, 這明顯與我們的要求不符合,后來網上找了找資料,用HashMap來記錄一個CheckBox的勾選記錄就解決了
以下是實現的的一個小Demo
這是XML ListView 每個item文件清單
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" ><RelativeLayout android:id="@+id/outpatient_check_hospital" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="5.0dip" android:layout_marginLeft="12.599976dip" android:layout_marginRight="12.599976dip" android:layout_marginTop="5.0dip" android:gravity="center_vertical" android:background="#AAAAAA"> <LinearLayout android:id="@+id/linear_layout_up" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_margin="10.0dip" android:gravity="center" android:orientation="horizontal" > <ImageView android:layout_width="10dip" android:layout_height="10dip" android:adjustViewBounds="false" /> <TextView android:id="@+id/tv_device_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="2.0" android:text="名稱" android:textColor="#ff323232" android:textSize="16.0sp" android:typeface="monospace" /> <CheckBox android:id="@+id/checkBox1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="" /> </LinearLayout> </RelativeLayout> </LinearLayout> </pre><a class="CopyToClipboard" title="copy" href="/misc/goto?guid=4959614078538900840"></a></div>
</div> </div>
這是顯示ListView的頁面,簡單初始化幾個數據
</div> </div>public class MainActivity extends Activity {private ListView listView; private ListViewAdapter adapter; private String[] beans = new String[] { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13","14","15","16","17","18","19" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { // TODO Auto-generated method stub Log.i("htp", "beans.size:" + beans.length); listView = (ListView) findViewById(R.id.listView1); adapter = new ListViewAdapter(MainActivity.this, beans); listView.setAdapter(adapter); listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); } </pre><br />
下面就寫一個Adapter類,我們依然繼承BaseAdapter類。這里我們使用一個HashMap<Integer,boolean>的鍵值來記錄checkbox在對應位置的選中狀況package com.example.listviewcheckboxdemo;import java.util.HashMap;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;public class ListViewAdapter extends BaseAdapter {
private Context context; private String[] beans; // 用來控制CheckBox的選中狀況 private static HashMap<Integer, Boolean> isSelected; class ViewHolder { TextView tvName; CheckBox cb; } public ListViewAdapter(Context context, String[] beans) { // TODO Auto-generated constructor stub this.beans = beans; this.context = context; isSelected = new HashMap<Integer, Boolean>(); // 初始化數據 initDate(); } // 初始化isSelected的數據 private void initDate() { for (int i = 0; i < beans.length; i++) { getIsSelected().put(i, false); } } @Override public int getCount() { // TODO Auto-generated method stub return beans.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return beans[position]; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub // 頁面 ViewHolder holder; String bean = beans[position]; LayoutInflater inflater = LayoutInflater.from(context); if (convertView == null) { convertView = inflater.inflate( R.layout.assist_device_binding_list_item, null); holder = new ViewHolder(); holder.cb = (CheckBox) convertView.findViewById(R.id.checkBox1); holder.tvName = (TextView) convertView .findViewById(R.id.tv_device_name); convertView.setTag(holder); } else { // 取出holder holder = (ViewHolder) convertView.getTag(); } holder.tvName.setText(bean); // 監聽checkBox并根據原來的狀態來設置新的狀態 holder.cb.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (isSelected.get(position)) { isSelected.put(position, false); setIsSelected(isSelected); } else { isSelected.put(position, true); setIsSelected(isSelected); } } }); // 根據isSelected來設置checkbox的選中狀況 holder.cb.setChecked(getIsSelected().get(position)); return convertView; } public static HashMap<Integer, Boolean> getIsSelected() { return isSelected; } public static void setIsSelected(HashMap<Integer, Boolean> isSelected) { ListViewAdapter.isSelected = isSelected; }
} </pre></div> </div> </div> 來自:http://blog.csdn.net/qq544529563/article/details/38760357
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