Android中获取联系人信息（二） 使用AsyncQueryHandler

package com.example.contactlist;

import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.content.AsyncQueryHandler;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class Loading extends ListActivity {
Context myContext = null;
MyListAdapter myListAdapter = null;
ViewHolder viewHolder = null;

private AsyncQueryHandler asyncQueryHandler; // 异步查询数据库类对象

// 用于存储联系人名称
List<String> myContactName = new ArrayList<String>();
// 用于存储联系人电话
List<String> myContactNumber = new ArrayList<String>();
// 用于存储联系人总数
int myContactAmount = 0;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
asyncQueryHandler = new MyAsyncQueryHandler(getContentResolver());

getContactList();
}

private void getContactList() {

Uri uri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI; // 联系人Uri；
// 查询的字段
String[] projection = { ContactsContract.CommonDataKinds.Phone._ID,
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
ContactsContract.CommonDataKinds.Phone.DATA1, "sort_key",
ContactsContract.CommonDataKinds.Phone.CONTACT_ID,
ContactsContract.CommonDataKinds.Phone.PHOTO_ID,
ContactsContract.CommonDataKinds.Phone.LOOKUP_KEY };
// 按照sort_key升序查詢
asyncQueryHandler.startQuery(0, null, uri, projection, null, null,
"sort_key COLLATE LOCALIZED asc");

}

private class MyAsyncQueryHandler extends AsyncQueryHandler {

public MyAsyncQueryHandler(ContentResolver cr) {
super(cr);
}

protected void onQueryComplete(int token, Object cookie, Cursor cursor) {
if (cursor != null && cursor.getCount() > 0) {

cursor.moveToFirst(); // 游标移动到第一项
for (int i = 0; i < cursor.getCount(); i++) {
cursor.moveToPosition(i);
String name = cursor.getString(1);
String number = cursor.getString(2);

myContactName.add(name);
myContactNumber.add(number);

}
myListAdapter = new MyListAdapter(Loading.this);
setListAdapter(myListAdapter);

super.onQueryComplete(token, cookie, cursor);
}

}
}

class MyListAdapter extends BaseAdapter {

public MyListAdapter(Context context) {
myContext = context;
}

public int getCount() {
// TODO Auto-generated method stub
return myContactName.size();
}

public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}

public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub

if (convertView == null) {
viewHolder = new ViewHolder();

convertView = LayoutInflater.from(myContext).inflate(
R.layout.list, null);
viewHolder.name = (TextView) convertView
.findViewById(R.id.name);
viewHolder.number = (TextView) convertView
.findViewById(R.id.number);

convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}

viewHolder.name.setText(myContactName.get(position));
viewHolder.number.setText(myContactNumber.get(position));

return convertView;
}
}

private static class ViewHolder {
TextView name;
TextView number;

}
}