我用 ContentProvider 做了一个查询系统中联系人的 DEMO，将查询出来的联系人信息放在 ListView 里面展示，用到了 pulltorefresh 框架，但是遇到一个问题，就是在下拉刷新之后那个“正在刷新” 会一起显示，并不会自己恢复。求大家帮忙看一下，我用的列表适配器是自定义的 CursorAdapter ，官方文档上面说用 CursorAdapter 要备份一个 ListView 和一个 Cursor ，我不明白是什么意思，我在 onrefresh 里面调用了 listview.onRefreshComplete() 方法，但是也不会恢复，我估计是因为用了 CursorAdapter 的缘故。
这个是 Activity 页面
package com.caoligai.contentproviderdemo.activity;
import com.caoligai.contentproviderdemo.R;
import com.caoligai.contentproviderdemo.adapter.MyCursorAdapter;
import com.handmark.pulltorefresh.library.IPullToRefresh;
import com.handmark.pulltorefresh.library.PullToRefreshAdapterViewBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Loader;
import android.database.Cursor;
import android.net.Uri;
import android.opengl.Visibility;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.provider.ContactsContract.Contacts;
import android.support.v4.widget.SimpleCursorAdapter;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
/**
* * @author caoligai E-mail: * @date 创建时间：2015-5-7 下午8:50:08 * @version 1.0 * @parameter
* * @since * @return
*/
public class ContactList extends Activity {
String tag = "ContactList";
PullToRefreshListView listview;
MyCursorAdapter adapter;
ProgressDialog pd;
Cursor cursor;
Uri uri = ContactsContract.Contacts.CONTENT_URI;
String[] projection = new String[] { Contacts._ID, Contacts.DISPLAY_NAME, };
boolean isFirstLoad = true;
public ListView actualListView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.contactlist);
// Log.d(tag, "cursor's length = " + cursor.getCount());
listview = (PullToRefreshListView) findViewById(R.id.listview);
listview.setMode(Mode.PULL_FROM_START);
listview.setOnRefreshListener(new OnRefreshListener<ListView>() {
@Override
public void onRefresh(PullToRefreshBase<ListView> refreshView) {
refreshView.setRefreshing(true);
listview.onRefreshComplete();
}
});
new listviewLoader().execute(null, null, null);
}
class listviewLoader extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
Log.d(tag, "listviewLoader.onPreExecute()");
pd = new ProgressDialog(ContactList.this);
pd.setCancelable(false);
pd.setMessage("正在查询数据...");
pd.show();
}
@Override
protected Void doInBackground(Void... params) {
Log.d(tag, "listviewLoader.doInBackground()");
cursor = getContentResolver().query(Contacts.CONTENT_URI,
projection, null, null, null);
Log.d(tag, "cursor.length = " + cursor.getCount());
isFirstLoad = false;
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.d(tag, "listviewLoader.onPostExecute()");
pd.dismiss();
adapter = new MyCursorAdapter(ContactList.this, cursor,
getLayoutInflater(), getContentResolver());
listview.setAdapter(adapter);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
finish();
}
}
这个是自定义的 CursorAdapter
package com.caoligai.contentproviderdemo.adapter;
import com.caoligai.contentproviderdemo.R;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds;
import android.provider.ContactsContract.Contacts;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.TextView;
/**
* * @author caoligai
*
* 自定义游标适配器，用于将 cursor 游标的数据映射到 ListView 中
*
*/
public class MyCursorAdapter extends CursorAdapter {
LayoutInflater flater;
Context context;
ContentResolver cr;
public MyCursorAdapter(Context context, Cursor c, LayoutInflater flater,
ContentResolver cr) {
super(context, c);
this.context = context;
this.flater = LayoutInflater.from(context);
this.cr = cr;
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
ViewHolder holder = new ViewHolder();
View item = flater.inflate(R.layout.list_item, null);
holder.name = (TextView) item.findViewById(R.id.item_name);
holder.number = (TextView) item.findViewById(R.id.item_number);
item.setTag(holder);
return item;
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
ViewHolder holder = (ViewHolder) view.getTag();
// TextView name = (TextView) view.findViewById(R.id.item_name);
// 设置姓名的值
holder.name.setText(cursor.getString(cursor
.getColumnIndex(Contacts.DISPLAY_NAME)));
// 根据联系人 id 查询电话号码
Cursor idcursor = cr
.query(CommonDataKinds.Phone.CONTENT_URI,
null,
CommonDataKinds.Phone.CONTACT_ID
+ " = "
+ cursor.getString(cursor
.getColumnIndex(ContactsContract.Contacts._ID)),
null, null);
//一个联系人可能有多个电话号码，这里只处理同一个联系人的第一个号码
Log.d(null, "idcursor.length = " + idcursor.getCount());
if (idcursor.moveToNext()) {
holder.number
.setText(idcursor.getString(idcursor
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));
}
}
static class ViewHolder {
TextView name;
TextView number;
}
}
运行之后一起保持这个样子
