Android联系人自动过滤并显示“新建联系人”
此文写给新手的 高手莫看哈！！！
主要更改是ListView的adapter来实现自动过滤。
Demo结构：
java文件：
ContactActivity.java??? 主屏幕
NewContactAdapter.java??? 显示“新建联系人”的adapter
PhoneNumberAdapter.java??? 显示通讯录得adapter
ContactEntity.java??? 通讯录实体类
Layout文件：
main.xml??? 一个editText和一个listView
list_item.xml??? 自定义listview的item布局
list_item_2.xml??? “新建联系人”的item布局
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主要是下面三个文件（demo已上传 有需要的可以下载）
ContactActivity.java
package com.yalitong.activity;import java.util.ArrayList;import java.util.List;import com.yalitong.adapter.NewContactAdapter;import com.yalitong.adapter.PhoneNumberAdapter;import com.yalitong.entity.ContactEntity;import android.app.Activity;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.provider.ContactsContract;import android.view.KeyEvent;import android.view.View;import android.view.View.OnKeyListener;import android.widget.BaseAdapter;import android.widget.EditText;import android.widget.ListView;public class ContactActivity extends Activity {//private String tag = "ContactActivity";private Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;private String[] projection = new String[] {ContactsContract.CommonDataKinds.Phone.CONTACT_ID,ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone.NUMBER };private Cursor cursor = null;private ListView listView = null;private EditText numberEditText = null;private BaseAdapter baseAdapter = null;private List<ContactEntity> list = new ArrayList<ContactEntity>();@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);listView = (ListView)findViewById(R.id.list);baseAdapter = new PhoneNumberAdapter(this,list);listView.setAdapter(baseAdapter);numberEditText = (EditText)findViewById(R.id.number);numberEditText.setOnKeyListener(new NumberTextView());}@Overrideprotected void onResume() {super.onResume();queryContacts(uri, projection, null, null, null);}/** * 监听键盘事件 * @author yangfan * */private class NumberTextView implements OnKeyListener{String queryNubmer = null;String selection = null;String[] selectionArgs = null;@Overridepublic boolean onKey(View v, int keyCode, KeyEvent event) {numberEditText = (EditText)v;queryNubmer = numberEditText.getText().toString().trim();//70-83行可以再优化一下，我这里每次事件都会去查询通讯录 这样肯定不是最好的 大家可以自己优化下//每次点击键盘的时候先清理list中的数据，如果不清除原先的数据，就会导致ListView数据不停地增加list.clear();//selection = ContactsContract.CommonDataKinds.Phone.NUMBER +" like ?";selectionArgs = new String[]{queryNubmer + "%"};queryContacts(uri, projection, selection, selectionArgs, null);if(list.size() == 0){//当没有查到数据的时候 显示“新建联系人”字样baseAdapter = new NewContactAdapter(ContactActivity.this);}else if(list.size() > 0){baseAdapter = new PhoneNumberAdapter(ContactActivity.this,list);}listView.setAdapter(baseAdapter);baseAdapter.notifyDataSetChanged();return false;}}/** * 查询通讯录中的数据 并添加在list中 * @param uri * @param projection * @param selection * @param selectionArgs * @param sortOrder */private void queryContacts(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder){cursor = getContentResolver().query(uri, projection, selection, selectionArgs, sortOrder);ContactEntity contactEntity = null;if(cursor.getCount() > 0){while(cursor.moveToNext()){contactEntity = new ContactEntity();contactEntity.setContactName(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME)));contactEntity.setContactNumber(cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));list.add(contactEntity);}}}}?PhoneNumberAdapter.java
package com.yalitong.adapter;import java.util.List;import com.yalitong.activity.R;import com.yalitong.entity.ContactEntity;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class PhoneNumberAdapter extends BaseAdapter {//private String tag = "PhoneNumberAdapter";private Context context = null;private List<ContactEntity> list = null;public PhoneNumberAdapter(Context context , List<ContactEntity> list){this.context = context;this.list = list;}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if(convertView == null){convertView = LayoutInflater.from(context).inflate(R.layout.list_item, null);CacheView cacheView = new CacheView();cacheView.nameTextView = (TextView)convertView.findViewById(R.id.item_name);cacheView.numberTextView = (TextView)convertView.findViewById(R.id.item_number);convertView.setTag(cacheView);}CacheView cacheView = (CacheView)convertView.getTag();cacheView.nameTextView.setText(list.get(position).getContactName());cacheView.numberTextView.setText(list.get(position).getContactNumber());return convertView;}private class CacheView{TextView nameTextView = null;TextView numberTextView = null;}}??
NewContactAdapter.java
package com.yalitong.adapter;import com.yalitong.activity.R;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class NewContactAdapter extends BaseAdapter {//private String tag = "NewContactAdapter";private Context context = null;public NewContactAdapter(Context context){this.context = context;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn 1;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn null;}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {//listView中最常见的优化方法if(convertView == null){convertView = LayoutInflater.from(context).inflate(R.layout.list_item_2, null);CacheView cacheView = new CacheView();cacheView.nameTextView = (TextView)convertView.findViewById(R.id.newContact);convertView.setTag(cacheView);}CacheView cacheView = (CacheView)convertView.getTag();cacheView.nameTextView.setText(R.string.newContact);return convertView;}private class CacheView{TextView nameTextView = null;}}??
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