Android在listview添加checkbox实现单选多选操作问题

android根据View的不同状态更换不同的背景
http://www.eoeandroid.com/thread-198029-1-1.html
android 模仿朋友网推出的菜单效果【改进版】
http://www.eoeandroid.com/thread-198019-1-1.html
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http://www.eoeandroid.com/thread-198033-1-1.html

在 android 某些开发需求当中，有时候需要在listveiw中加入checkbox实现单选，多选操作。表面上看上去只是改变checkbox那么简单，然而实际开发中，实现起来并不是那么得心应手。尤其当listview比较多(比如屏幕最多只能显示10个item，但总共有12个item，也就是说listview的item数大于屏幕能够显示的item数)滑动屏幕的时候，由于适配器中getview()会重复使用被移除屏幕的item，所以会造成checkbox选择状态不正常的现象。自己在开发中碰到这样的问题很是苦恼，查了下资料，发现网上很少没有针对这类批量操作并没有一个完整的例子。搜了很多篇帖子才完美的实现这一常用的操作。所以在这里把这个Demo贴出来，供大家参考，希望能对大家有所帮助。
主界面的布局main.xml 这个就不多说什么

<?xml version="1.0" encoding="utf-8"?>      <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:orientation="vertical" >   <LinearLayout   android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  >      <TextView   android:id="@+id/tv"  android:layout_width="fill_parent"  android:layout_height="50dip"  android:textColor="#FCFCFC"  android:textSize="11pt"  android:gravity="center_vertical"  android:layout_marginLeft="10dip"  />      <ListView   android:id="@+id/lv"  android:layout_width="fill_parent"  android:layout_height="381dip"  android:cacheColorHint ="#00000000"  ></ListView>      </LinearLayout>      <RelativeLayout   android:layout_width="fill_parent"  android:layout_height="53dip"  android:orientation="horizontal"  >      <Button      android:id="@+id/selectall"  android:layout_width="80dip"  android:layout_height="50dip"  android:layout_marginLeft="20dip"  android:text="全选"  android:gravity="center"     />      <Button   android:id="@+id/inverseselect"  android:layout_width="80dip"  android:layout_height="50dip"  android:layout_marginLeft="118dip"  android:text="反选"  android:gravity="center"  />      <Button   android:id="@+id/cancel"  android:layout_width="80dip"  android:layout_height="50dip"  android:layout_marginLeft="213dip"  android:text="取消已选"  android:gravity="center"     />   </RelativeLayout>   </LinearLayout>

[align=left]ListView每个item的布局,listviewitem.xml：[/align] [align=left]这里需要注意的是，由于checkbox的点击事件优先级比listview的高，所以要添加android:focusable="false"属性，使得checkbox初始的时候没有获取焦点。[/align] [align=left]另外这里是点击ListView的item控制checkbox的状态改变，也就是让item接收clik事件，所以需要加上android:focusableInTouchMode="false"这一属性。[/align]

<?xml version="1.0" encoding="utf-8"?>      <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="55dip"  android:orientation="horizontal"  android:layout_marginTop="20dip"     >      <TextView   android:id="@+id/item_tv"  android:layout_width="267dip"  android:layout_height="40dip"  android:textSize="10pt"  android:gravity="center_vertical"  android:layout_marginLeft="10dip"     />      <CheckBox   android:id="@+id/item_cb"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:focusable="false"  android:focusableInTouchMode="false"  android:clickable="false"  android:layout_toRightOf="@id/item_tv"  android:layout_alignParentTop="true"  android:layout_marginRight="5dip"     />   </RelativeLayout >

ViewHolder类

package simtice.test.listview.viewholder;      import android.widget.CheckBox;   import android.widget.TextView;         public class ViewHolder {   public TextView tv = null;   public CheckBox cb = null;   }

为listview自定义适配器，该类为主Activity类MainActivity.java的内部类

public static class MyAdapter extends BaseAdapter {      public static HashMap<Integer, Boolean> isSelected;   private Context context = null;   private LayoutInflater inflater = null;   private List<HashMap<String, Object>> list = null;   private String keyString[] = null;   private String itemString = null; // 记录每个item中textview的值   private int idValue[] = null;// id值      public MyAdapter(Context context, List<HashMap<String, Object>> list,   int resource, String[] from, int[] to) {   this.context = context;   this.list = list;   keyString = new String[from.length];   idValue = new int[to.length];   System.arraycopy(from, 0, keyString, 0, from.length);   System.arraycopy(to, 0, idValue, 0, to.length);   inflater = LayoutInflater.from(context);   init();   }      // 初始化 设置所有checkbox都为未选择   public void init() {   isSelected = new HashMap<Integer, Boolean>();   for (int i = 0; i < list.size(); i++) {   isSelected.put(i, false);   }   }      @Override  public int getCount() {   return list.size();   }      @Override  public Object getItem(int arg0) {   return list.get(arg0);   }      @Override  public long getItemId(int arg0) {   return 0;      }      @Override  public View getView(int position, View view, ViewGroup arg2) {   ViewHolder holder = null;   if (holder == null) {   holder = new ViewHolder();   if (view == null) {   view = inflater.inflate(R.layout.listviewitem, null);   }      holder.tv = (TextView) view.findViewById(R.id.item_tv);   holder.cb = (CheckBox) view.findViewById(R.id.item_cb);   view.setTag(holder);   } else {   holder = (ViewHolder) view.getTag();   }   HashMap<String, Object> map = list.get(position);   if (map != null) {   itemString = (String) map.get(keyString[0]);   holder.tv.setText(itemString);   }   holder.cb.setChecked(isSelected.get(position));   return view;   }      }

最后，最重要的就是MainActivity.java中一些事件响应的处理

public class MainActivity extends Activity {      TextView tv = null;   ListView lv = null;   Button btn_selectAll = null;   Button btn_inverseSelect = null;   Button btn_calcel = null;   String name[] = { "G1", "G2", "G3", "G4", "G5", "G6", "G7", "G8", "G9", "G10", "G11", "G12", "G13", "G14" };      ArrayList<String> listStr = null;   private List<HashMap<String, Object>> list = null;   private MyAdapter adapter;      @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);      tv = (TextView) this.findViewById(R.id.tv);   lv = (ListView) this.findViewById(R.id.lv);   btn_selectAll = (Button) this.findViewById(R.id.selectall);   btn_inverseSelect = (Button) this.findViewById(R.id.inverseselect);   btn_calcel = (Button) this.findViewById(R.id.cancel);   showCheckBoxListView();      //全选   btn_selectAll.setOnClickListener(new OnClickListener(){   @Override     public void onClick(View arg0) {   listStr = new ArrayList<String>();   for(int i=0;i<list.size();i++){   MyAdapter.isSelected.put(i,true);   listStr.add(name<i>);   }      adapter.notifyDataSetChanged();//注意这一句必须加上，否则checkbox无法正常更新状态   tv.setText("已选中"+listStr.size()+"项");   }   });      //反选      btn_inverseSelect.setOnClickListener(new OnClickListener(){   @Override  public void onClick(View v) {   for(int i=0;i<list.size();i++){      if(MyAdapter.isSelected.get(i)==false){   MyAdapter.isSelected.put(i, true);   listStr.add(name<i>);   }   else{   MyAdapter.isSelected.put(i, false);   listStr.remove(name<i>);   }   }   adapter.notifyDataSetChanged();   tv.setText("已选中"+listStr.size()+"项");   }     });   //取消已选   btn_calcel.setOnClickListener(new OnClickListener(){   @Override  public void onClick(View v) {      for(int i=0;i<list.size();i++){      if(MyAdapter.isSelected.get(i)==true){   MyAdapter.isSelected.put(i, false);   listStr.remove(name<i>);   }   }      adapter.notifyDataSetChanged();   tv.setText("已选中"+listStr.size()+"项");      }      });   }      // 显示带有checkbox的listview   public void showCheckBoxListView() {   list = new ArrayList<HashMap<String, Object>>();   for (int i = 0; i < name.length; i++) {      HashMap<String, Object> map = new HashMap<String, Object>();   map.put("item_tv", name<i>);   map.put("item_cb", false);   list.add(map);      adapter = new MyAdapter(this, list, R.layout.listviewitem,   new String[] { "item_tv", "item_cb" }, new int[] {   R.id.item_tv, R.id.item_cb });   lv.setAdapter(adapter);   listStr = new ArrayList<String>();   lv.setOnItemClickListener(new OnItemClickListener() {      @Override  public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) {   ViewHolder holder = (ViewHolder) view.getTag();      holder.cb.toggle();// 在每次获取点击的item时改变checkbox的状态   MyAdapter.isSelected.put(position, holder.cb.isChecked()); // 同时修改map的值保存状态   if (holder.cb.isChecked() == true) {   listStr.add(name[position]);   } else {   listStr.remove(name[position]);   }   tv.setText("已选中"+listStr.size()+"项");   }      });   }   }      //为listview自定义适配器内部类      public static class MyAdapter extends BaseAdapter {   ...   }   }

效果图：



我选择了G2、G3、G11三项，现在屏幕滑动到底部，看以看到状态保存的很好，TextView显示已选中3项。全选、反选、取消全选功能正常，多选操作完美解决！

本文出自 “Android小子的” 博客，请务必保留此出处http://androidrigl.blog.51cto.com/7531835/1247553