Android中ListView与CheckBox结合----多选与记录
jopen
10年前
很多时候我们会用到ListView与CheckBox结合的东西，比如一个清单，可以用来多选，但是很多人似乎也在这个地方遇到很多问题，我刚开始学的时候也是遇到假选问题，当列表中数量多的之后，我勾选一个，滑动页面会发现条目也勾选上了， 这明显与我们的要求不符合，后来网上找了找资料，用HashMap来记录一个CheckBox的勾选记录就解决了
以下是实现的的一个小Demo
这是XML ListView 每个item文件清单
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/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="名称" 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>
这是显示ListView的页面，简单初始化几个数据
</div> </div>
</div> </div> 来自：http://blog.csdn.net/qq544529563/article/details/38760357
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); }
下面就写一个Adapter类，我们依然继承BaseAdapter类。这里我们使用一个HashMap<Integer,boolean>的键值来记录checkbox在对应位置的选中状况
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; // 用来控制CheckBox的选中状况 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>(); // 初始化数据 initDate(); } // 初始化isSelected的数据 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 // 页面 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); // 监听checkBox并根据原来的状态来设置新的状态 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); } } }); // 根据isSelected来设置checkbox的选中状况 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; } }