Android 系统给我们提供了访问通讯录的接口，通过接口获取通讯录信息。Adapter 与 View 的连接主要依靠 getView 这个方法返回我们需要的自定义 view。 ListView 是 Android App 中一个最最最常用的控件了，所以如何让 ListView 流畅运行，获取良好的用户体验是非常重要的。 对 ListView 优化就是对 Adapter 中的 getView 方法进行优化。
核心内容：
1.获取手机通讯录
2.数据封装
3.创建 Adapter
4.优化适配器
开发环境：Eclipse
效果图：
步骤：
1.新建项目，新建 GetNumber.class 类，用来获取通讯录中的信息
package com.yanis.getmyphonenumber; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.database.Cursor; import android.provider.ContactsContract.CommonDataKinds.Phone; public class GetNumber { public static List<PhoneInfo> lists = new ArrayList<PhoneInfo>(); public static String getNumber(Context context) { Cursor cursor = context.getContentResolver().query(Phone.CONTENT_URI, null, null, null, null); String phoneNumber; String phoneName; while (cursor.moveToNext()) { phoneNumber = cursor.getString(cursor.getColumnIndex(Phone.NUMBER));//电话号码 phoneName = cursor.getString(cursor.getColumnIndex(Phone.DISPLAY_NAME));//姓名 PhoneInfo info = new PhoneInfo(phoneName, phoneNumber); lists.add(info); System.out.println(phoneName+phoneNumber); } return null; } }
2.添加权限
<!-- 读取联系人权限 --> <uses-permission android:name="android.permission.READ_CONTACTS"/>
3.新建 PhoneInfo.class 类作为通讯录信息封装类
package com.yanis.getmyphonenumber; /** * * @author yechao * @说明 通讯录信息封装类 */ public class PhoneInfo { private String phoneName; private String phoneNumber; public PhoneInfo(String phoneName, String phoneNumber) { setPhoneName(phoneName); setPhoneNumber(phoneNumber); } public String getPhoneName() { return phoneName; } public void setPhoneName(String phoneName) { this.phoneName = phoneName; } public String getPhoneNumber() { return phoneNumber; } public void setPhoneNumber(String phoneNumber) { this.phoneNumber = phoneNumber; } }
4.自定义 ListView 的适配器类 MyAdapter.class
package com.yanis.getmyphonenumber; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.LinearLayout; import android.widget.TextView; public class MyAdapter extends BaseAdapter { private List<PhoneInfo> lists; private Context context;//承接上下文 public MyAdapter(List<PhoneInfo> lists,Context context) { this.lists = lists; this.context = context; } //返回集合的数量 @Override public int getCount() { return lists.size(); } //返回当前数据 @Override public Object getItem(int position) { return lists.get(position); } //获取当前ID @Override public long getItemId(int position) { return position; } //返回当前视图 @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder ; if(convertView==null) { convertView = LayoutInflater.from(context).inflate(R.layout.call,null); holder = new ViewHolder(); holder.tvName = (TextView)convertView.findViewById(R.id.tv_Name); holder.tvNumber = (TextView)convertView.findViewById(R.id.tv_Number); convertView.setTag(holder); }else { holder = (ViewHolder)convertView.getTag(); } holder.tvName.setText(lists.get(position).getPhoneName()); holder.tvNumber.setText(lists.get(position).getPhoneNumber()); return convertView; } private static class ViewHolder{ TextView tvName; TextView tvNumber; } }
5.最后就是主界面代码，至于布局太简单就不列出来了，有兴趣的童鞋可以查看源代码
package com.yanis.getmyphonenumber; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; public class MainActivity extends Activity { private ListView listView; private MyAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); GetNumber.getNumber(this); initView(); } private void initView() { listView =(ListView) findViewById(R.id.listView); adapter = new MyAdapter(GetNumber.lists, this); listView.setAdapter(adapter); } }
本文转自叶超Luka博客园博客，原文链接：http://www.cnblogs.com/yc-755909659/p/4312221.html，如需转载请自行联系原作者
