Android通讯录开发之实现全选、反选功能，主流app开发工具
// 用于保存勾选的联系人
private HashMap
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();
}
全选方法
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，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
private ArrayList contactList;
private Context
context;
private HashMap
private String kind;
public class ViewHolder {
public TextView contactName;
public TextView contactMobile;
public TextView contactEmail;
public CheckBox checkBox;
}
public LocalContactAdapter(Context context, ArrayList contactList,
String kind) {
this.contactList = contactList;
this.context = context;
map_NumberSelected = new HashMap
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 int getCount() {
return contactList.size();
}
@Override
public Object getItem(int position) {
return contactList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}