仿米聊添加好友 listview中checkbox选中，更新选择条数问题

本示例主要解决问题：

1、listview中checkbox多选中错乱问题

2、实时更新选中的条数

效果图：

代码示例：

Activity:

public class CountDemoActivity extends Activity {protected static final String TAG = "CountDemoActivity";private ListView listView;private ArrayList<HashMap<String, String>> arrayList;private ArrayList<Boolean> checkedList;private MyOnCheckedChangeListener checkedChangeListener = new MyOnCheckedChangeListener();private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {int count = 0;for (int i = 0; i < checkedList.size(); i++) {boolean isChecked = (boolean) checkedList.get(i);if (isChecked) {count++;}}selectButton.setText("选择（" + String.valueOf(count) + "）");};};private Button selectButton;private MyListViewAdapter myListViewAdapter;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);selectButton = (Button) findViewById(R.id.select);arrayList = new ArrayList<HashMap<String, String>>();for (int i = 0; i < 20; i++) {HashMap<String, String> map = new HashMap<String, String>();map.put("content", "Content" + i);arrayList.add(map);}listView = (ListView) findViewById(R.id.listView);listView.setOnItemClickListener(new ListViewItemOnClick());myListViewAdapter = new MyListViewAdapter(arrayList);listView.setAdapter(myListViewAdapter);}private class ListViewItemOnClick implements OnItemClickListener {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {Toast.makeText(CountDemoActivity.this, String.valueOf(position), 0).show();}}private class MyListViewAdapter extends BaseAdapter {private int listsize;public MyListViewAdapter(ArrayList<HashMap<String, String>> arrayList) {this.listsize = arrayList.size();checkedList = new ArrayList<Boolean>(listsize);for (int i = 0; i < arrayList.size(); i++) {checkedList.add(false);}}@Overridepublic int getCount() {return arrayList.size();}@Overridepublic Object getItem(int position) {return arrayList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;if (convertView == null) {LayoutInflater inflater = LayoutInflater.from(CountDemoActivity.this);convertView = inflater.inflate(R.layout.listview_item, null);holder = new ViewHolder();holder.content = (TextView) convertView.findViewById(R.id.content);holder.cbox = (CheckBox) convertView.findViewById(R.id.checkBox);holder.cbox.setOnCheckedChangeListener(checkedChangeListener);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}Log.e(TAG, "getView " + String.valueOf(position));holder.content.setText(arrayList.get(position).get("content"));holder.cbox.setId(position);if (!checkedList.isEmpty()) {boolean isChecked = (Boolean) checkedList.get(position);holder.cbox.setChecked(isChecked);}return convertView;}class ViewHolder {CheckBox cbox;TextView content;}}private class MyOnCheckedChangeListener implements OnCheckedChangeListener {@Overridepublic void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {Message message = new Message();Bundle bundle = new Bundle();bundle.putBoolean("isChecked", isChecked);message.setData(bundle);handler.sendMessage(message);checkedList.set(buttonView.getId(), isChecked);Log.e("isChecked", String.valueOf(isChecked));}}}

layout\main.xml

<?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="fill_parent"    android:orientation="vertical" >    <TextView        android:id="@+id/title"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center_horizontal"        android:text="选择" /><LinearLayout         android:id="@+id/linear"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        >        <Button             android:id="@+id/select"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="选择（0）"            android:layout_weight="1"            />        <Button             android:id="@+id/cancel"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="取消"            android:layout_weight="1"            />    </LinearLayout>    <ListView         android:id="@+id/listView"        android:layout_below="@+id/title"        android:layout_above="@id/linear"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:cacheColorHint="#00000000"        ></ListView>    </RelativeLayout>