Android通讯录开发之实现全选、反选功能
2014年1月15日
实现全选、反选不是什么难的事情，就只是用另外一个数据结构来存储被选中的状态，通过刷新列表来更新列表的显示状态。下面是实现效果：
定义一个散列表来存储选中状态
// 用于保存勾选的联系人 private HashMap<Contact, Boolean> map_NumberSelected = new HashMap<Contact, Boolean>();
定义标识表示是否已经全选
private boolean isAllChecked = false;
在触发事件的位置根据标识来实现全选或反选
if (isAllChecked) {
selectAllBtn.setBackgroundResource(R.drawable.select_all_not);
invertSelection();
} else {
selectAllBtn.setBackgroundResource(R.drawable.select_all);
selectAllContacts();
}
public void selectAllContacts() {
for (int i = 0; i < contactList.size(); i++) {
Contact contact = contactList.get(i);
map_NumberSelected.put(contact, true);
}
isAllChecked = true;
refreshList();
}
反选方法
public void invertSelection() {
for (int i = 0; i < contactList.size(); i++) {
Contact contact = contactList.get(i);
map_NumberSelected.put(contact, false);
}
isAllChecked = false;
refreshList();
}
上面用到contactList是你得到的数据源，是一个List<Contact>，它跟map_NumberSelected都通过adapter里面定义的set方法注入到adapter里，所以选中状态发生变化也相当于数据源发生变化，只要调用notifyDataSetChanged()方法就可以更新列表。
下面是自定义adapter的代码，更新选中的状态在getView方法进行
package com.suntek.mobilemeeting.adapter;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
import com.suntek.mobilemeeting.R;
import com.suntek.mobilemeeting.model.Contact;
/**
* 本地联系人适配器
*
* @author wwj
*
*/
public class LocalContactAdapter extends BaseAdapter {
private HashMap<Integer, View> lmap = new HashMap<Integer, View>();
private ArrayList<Contact> contactList;
private Context context;
private HashMap<Contact, Boolean> map_NumberSelected = null;
private String kind;
public class ViewHolder {
public TextView contactName;
public TextView contactMobile;
public TextView contactEmail;
public CheckBox checkBox;
}
public LocalContactAdapter(Context context, ArrayList<Contact> contactList,
String kind) {
this.contactList = contactList;
this.context = context;
map_NumberSelected = new HashMap<Contact, Boolean>();
this.kind = kind;
}
@Override
public int getCount() {
return contactList.size();
}
@Override
public Object getItem(int position) {
return contactList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.local_contact_list_item,
null);
holder.contactName = (TextView) convertView
.findViewById(R.id.name_tv);
holder.contactMobile = (TextView) convertView
.findViewById(R.id.number_tv);
holder.contactEmail = (TextView) convertView
.findViewById(R.id.email_tv);
holder.checkBox = (CheckBox) convertView
.findViewById(R.id.local_contact_checkbox);
// lmap.put(position, convertView);
convertView.setTag(holder);
} else {
// convertView = lmap.get(position);
holder = (ViewHolder) convertView.getTag();
}
Contact contact = contactList.get(position);
if (contact.getName() == "" || contact.getName() == null) {
String name = "未知";
holder.contactName.setText(name);
} else {
holder.contactName.setText(contact.getName());
}
if (kind != null && kind.equals("email")) {
if (!TextUtils.isEmpty(contact.getEmail())) {
holder.contactEmail.setText(contact.getEmail());
holder.contactMobile.setVisibility(View.GONE);
}
} else if (!TextUtils.isEmpty(contact.getNumber())) {
holder.contactMobile.setText(contact.getNumber());
holder.contactEmail.setVisibility(View.GONE);
} else {
holder.contactMobile.setVisibility(View.GONE);
holder.contactEmail.setVisibility(View.GONE);
}
// 显示是否选中状态
holder.checkBox.setChecked(map_NumberSelected.get(contact));
return convertView;
}
public void setContactList(ArrayList<Contact> contactList) {
this.contactList = contactList;
}
public void setMap_NumberSelected(
HashMap<Contact, Boolean> map_NumberSelected) {
this.map_NumberSelected = map_NumberSelected;
}
}