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, 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, null, 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,null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contact_id, null, 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;
}
}
}
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