作业五之AsyncTask,SQLite,Contacts,AutoCompleteTextView(Android)

这次的作业主要是考察SQLite的使用,获取手机联系人的信息(姓名,手机号码,QQ/备注),然后导入到数据库中,这里我采用了AsyncTask(异步任务)来处理大量数据的插入,这是Android推荐的多线程用法,当然也可以用Thread和Handler.作业还要求使用自动完成文本编辑框来完成数据搜索任务,所以也加入到标题关键词中去了.(图中那几个test是上一次作业从xls文件文件导入到联系人中的,有兴趣可以去看看)

哦,对,还有一个小地方就是关闭输入法面板,这也是我第一次用到,详情看源码吧: )

感觉比较重要的代码就是AsyncTask这一块吧,以前都是用Thread和Handler的模型来做的,所以只贴这一部分的代码了,源码依然在最后: )

import java.util.Iterator;

import com.fsproject.contactsdatabase.DatabaseControl.ContactsData;

import android.content.ContentValues;
import android.database.Cursor;
import android.os.AsyncTask;
import android.provider.ContactsContract;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class InputTask extends AsyncTask<Object,Object,Object> {
	DatabaseControl d;
	LoadingAdapter la;
	
	public InputTask(DatabaseControl _d){
		d = _d;
		la = new LoadingAdapter();
		d.a.get().lv_contacts.setAdapter(la);
		d.db_deleteAll();
	}
	@Override
	protected String doInBackground(Object... params) {
		// 获得所有的联系人
		Cursor cur = d.a.get().getContentResolver().query(ContactsContract.Contacts.CONTENT_URI,null,null);

		int id = 1;
		// 循环遍历
		if (cur.moveToFirst()) {
			int id_column = cur.getColumnIndex(ContactsContract.Contacts._ID);
			int name_column = cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);

			do {
				// 获得联系人的ID号
				String contact_id = cur.getString(id_column);
				// 获得联系人姓名
				String name = cur.getString(name_column);
				String qq = null;
				String phone_number = null;

				String noteWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";
				String[] noteWhereParams = new String[] { contact_id,ContactsContract.CommonDataKinds.Note.CONTENT_ITEM_TYPE };
				Cursor noteCur = d.a.get().getContentResolver().query(ContactsContract.Data.CONTENT_URI,noteWhere,noteWhereParams,null);
				
				if (noteCur.moveToFirst()) {
					String note = noteCur.getString(noteCur.getColumnIndex(ContactsContract.CommonDataKinds.Note.NOTE));
					if (note.contains("QQ:")) {
						qq = note.substring(3);
					}
				}
				noteCur.close();

				// 查看该联系人有多少个电话号码。如果一个也没有的话这里会返回值为0
				int phoneCount = cur.getInt(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER));

				if (phoneCount > 0) {
					// 获得联系人的电话号码
					Cursor phones = d.a.get().getContentResolver().query(
							ContactsContract.CommonDataKinds.Phone.CONTENT_URI,ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contact_id,null);

					if (phones.moveToFirst()) {
						phone_number = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
					}
				}
				
				d.list_contacts.add(new ContactsData(id,name,qq,phone_number));
				publishProgress(name,0);
				id++;
				
			} while (cur.moveToNext());
		}
		cur.close();
		
		publishProgress("",1);

		ContentValues values = new ContentValues();
		for (Iterator<ContactsData> iter = d.list_contacts.iterator(); iter.hasNext();) {
			ContactsData cd = (ContactsData) iter.next();
			values.put("name",cd.name);
			values.put("qq",cd.qq);
			values.put("phone_number",cd.phone_number);

			d.db.insert("contacts","_id",values);
		}

		return "操作完成.";
	}

	@Override
	protected void onPostExecute(Object result) {
		Toast.makeText(d.a.get(),(String)result,Toast.LENGTH_SHORT).show();
		d.a.get().lv_contacts.setAdapter(d.a.get().lc_adapter);
		d.a.get().lc_adapter.notifyDataSetChanged();
	}

	@Override
	protected void onProgressUpdate(Object... values) {
		if (((Integer) values[1]).intValue() == 0) {
			la.progress = "读取联系人数据中:" + (String) values[0] + "...";
			la.notifyDataSetChanged();
		} else if(((Integer) values[1]).intValue() == 1) {
			la.progress = "正在写入数据库...";
			la.notifyDataSetChanged();
		}
	}
	
	public class LoadingAdapter extends BaseAdapter {
		public String progress;
		
        public int getCount() {
            return 1;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position,View convertView,ViewGroup parent) {
        	TextView tv = null;
        	if(convertView==null) {
        		tv = new TextView(d.a.get());
        		tv.setGravity(Gravity.CENTER);
        		tv.setTextSize(20);
        		convertView = tv;
        	}
        	else
        		tv = (TextView)convertView;
        	
        	tv.setText(progress);
            return convertView;
        }
    }
}

源码下载:(请使用最新4.1.2SDK载入以确保没有错误)

http://dl.vmall.com/c0na5zn88a