Android通讯录开发之实现全选、反选功能public void selectAllContacts() { for

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<Integer, View> lmap = new HashMap<Integer, View>();

private ArrayList 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 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 contactList) {

this.contactList = contactList;

}

public void setMap_NumberSelected(

HashMap<Contact, Boolean> map_NumberSelected) {

尾声

面试成功其实都是必然发生的事情，因为在此之前我做足了充分的准备工作，不单单是纯粹的刷题，更多的还会去刷一些Android核心架构进阶知识点，比如：JVM、高并发、多线程、缓存、热修复设计、插件化框架解读、组件化框架设计、图片加载框架、网络、设计模式、设计思想与代码质量优化、程序性能优化、开发效率优化、设计模式、负载均衡、算法、数据结构、高级UI晋升、Framework内核解析、Android组件内核等。